X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=www%2Fjs%2Fremoteglot.js;h=d6a08a875b8642332f76f6bf60222797eec36f6e;hb=HEAD;hp=c103716d52bd7aaa314c5fb360f27ba2601a5e63;hpb=0966daf10b49c2d42bb5689a1d34a4e125144f48;p=remoteglot diff --git a/www/js/remoteglot.js b/www/js/remoteglot.js index c103716..d36bf9e 100644 --- a/www/js/remoteglot.js +++ b/www/js/remoteglot.js @@ -1,10 +1,61 @@ (function() { +'use strict'; -/** @type {window.ChessBoard} @private */ -var board = null; +/** + * Version of this script. If the server returns a version larger than + * this, it is a sign we should reload to upgrade ourselves. + * + * @type {number} + * @const + * @private */ +let SCRIPT_VERSION = 2023122700; + +/** + * The current backend URL. + * + * @type {!string} + * @private + */ +let backend_url = "/analysis.pl"; +let backend_hash_url = "/hash"; /** @type {window.ChessBoard} @private */ -var hiddenboard = null; +let board = null; + +/** @type {boolean} @private */ +let board_is_animating = false; + +/** + * The most recent analysis data we have from the server + * (about the most recent position). + * + * @type {?Object} + * @private */ +let current_analysis_data = null; + +/** + * If we are displaying previous analysis or from hash, this is non-null, + * and will override most of current_analysis_data. + * + * @type {?Object} + * @private + */ +let displayed_analysis_data = null; + +/** + * Games currently in progress, if any. + * + * @type {?Array.<{ + * name: string, + * url: string, + * hashurl: string, + * id: string, + * score: Object=, + * result: string=, + * }>} + * @private + */ +let current_games = null; /** @type {Array.<{ * from_col: number, @@ -17,97 +68,386 @@ var hiddenboard = null; * }>} * @private */ -var arrows = []; +let arrows = []; /** @type {Array.>} */ -var occupied_by_arrows = []; +let occupied_by_arrows = []; -var refutation_lines = []; +/** Currently displayed refutation lines (on-screen). + * Can either come from the current_analysis_data, displayed_analysis_data, + * or hash_refutation_lines (choose_displayed_refutation_lines() chooses which one). + * + * @typedef {{ + * score: Array, + * depth: string, + * pv: Array., + * move: string + * }} + * @private + */ +var RefutationLine; -/** @type {!number} @private */ -var move_num = 1; +/** Refutation lines from current hash probe. + * If non-null, will override refutation lines from the base position. + * + * @type {Array.} + */ +let hash_refutation_lines = null; -/** @type {!string} @private */ -var toplay = 'W'; +/** + * What FEN hash_refutation_lines is relative to. + */ +let hash_refutation_lines_base_fen = null; /** @type {number} @private */ -var ims = 0; +let ims = 0; /** @type {boolean} @private */ -var sort_refutation_lines_by_score = true; +let truncate_display_history = true; /** @type {!string|undefined} @private */ -var highlight_from = undefined; +let highlight_from = undefined; /** @type {!string|undefined} @private */ -var highlight_to = undefined; +let highlight_to = undefined; + +/** The HTML object of the move currently being highlighted (in red). + * @type {?Element} + * @private */ +let highlighted_move = null; + +/** Currently suggested/recommended move when dragging. + * @type {?{from: !string, to: !string}} + * @private + */ +let recommended_move = null; + +/** If reverse-dragging (dragging from the destination square to the + * source square), the destination square. + * @type {?string} + * @private + */ +let reverse_dragging_from = null; + +/** @type {?number} @private */ +let unique = null; + +/** @type {?string} @private */ +let admin_password = null; + +/** @type {boolean} @private */ +let enable_sound = false; /** @type {!number} @private */ -var unique = Math.random(); +let delay_ms = 0; + +/** + * Our best estimate of how many milliseconds we need to add to + * new Date() to get the true UTC time. Calibrated against the + * server clock. + * + * @type {?number} + * @private + */ +let client_clock_offset_ms = null; + +let clock_timer = null; + +/** The current position being analyzed, represented as a FEN string. + * Note that this is not necessarily the same as display_fen. + * @type {?string} + * @private + */ +let base_fen = null; /** The current position on the board, represented as a FEN string. + * Note that board.fen() does not contain e.g. who is to play. * @type {?string} * @private */ -var fen = null; +let display_fen = null; /** @typedef {{ * start_fen: string, - * uci_pv: Array., - * pretty_pv: Array. - * }} DisplayLine + * pv: Array., + * scores: Array<{first_move: number, score: Object}>, + * start_display_move_num: number + * }} + * + * "start_display_move_num" is the (half-)move number to start displaying the PV at, + * i.e., the index into pv. + * + * "score" is also evaluated at this point. scores can be empty and is frequently + * sparse; it's generally only really useful for history (we obviously don't know + * much about how the score will * move during e.g. a PV, except that a mate/TB + * counter might go down). */ +var DisplayLine; -/** @type {Array.} +/** All PVs that we currently know of. + * + * Element 0 is history (or null if no history). + * Element 1 is current main PV, or explored line if nowhere else on the screen. + * All remaining elements are refutation lines (multi-PV). + * + * @type {Array.} * @private */ -var display_lines = []; +let display_lines = []; /** @type {?DisplayLine} @private */ -var current_display_line = null; +let current_display_line = null; -/** @type {?number} @private */ -var current_display_move = null; - -var request_update = function() { - $.ajax({ - url: "http://analysis.sesse.net/analysis.pl?ims=" + ims + "&unique=" + unique - //url: "http://analysis.sesse.net:5000/analysis.pl?ims=" + ims + "&unique=" + unique - }).done(function(data, textstatus, xhr) { - ims = xhr.getResponseHeader('X-Remoteglot-Last-Modified'); - var num_viewers = xhr.getResponseHeader('X-Remoteglot-Num-Viewers'); - update_board(data, num_viewers); - }).fail(function() { - // Wait ten seconds, then try again. - setTimeout(function() { request_update(); }, 10000); - }); +/** @type {boolean} @private */ +let current_display_line_is_history = false; + +/** @type {?number} @private + * + * The highlighted/used/shown move in current_display_line.pv, in terms of absolute index + * (not relative to e.g. the start FEN). + */ +let current_display_move = null; + +/** + * The current backend request to get main analysis (not history), if any, + * so that we can abort it. + * + * @type {?AbortController} + * @private + */ +let current_analysis_xhr = null; + +/** + * The current timer to fire off a request to get main analysis (not history), + * if any, so that we can abort it. + * + * @type {?number} + * @private + */ +let current_analysis_request_timer = null; + +/** + * The current backend request to get historic data, if any. + * + * @type {?AbortController} + * @private + */ +let current_historic_xhr = null; + +/** + * The current backend request to get hash probes, if any, so that we can abort it. + * + * @type {?AbortController} + * @private + */ +let current_hash_xhr = null; + +/** + * The current timer to display hash probe information (it could be waiting on the + * board to stop animating), if any, so that we can abort it. + * + * @type {?number} + * @private + */ +let current_hash_display_timer = null; + +function supports_html5_storage() { + try { + return 'localStorage' in window && window['localStorage'] !== null; + } catch (e) { + return false; + } +} + +// Make the unique token persistent so people refreshing the page won't count twice. +// Of course, you can never fully protect against people deliberately wanting to spam. +function get_unique() { + let use_local_storage = supports_html5_storage(); + if (use_local_storage && window['localStorage']['unique']) { + return window['localStorage']['unique']; + } + let unique = Math.random(); + if (use_local_storage) { + window['localStorage']['unique'] = unique; + } + return unique; +} + +function request_update() { + current_analysis_request_timer = null; + + let handle_err = () => { + // Backend error or similar. Wait ten seconds, then try again. + current_analysis_request_timer = setTimeout(function() { request_update(); }, 10000); + }; + + current_analysis_xhr = new AbortController(); + const signal = current_analysis_xhr.signal; + fetch(backend_url + "?ims=" + ims + "&unique=" + unique, { signal }) + .then((response) => response.json().then(data => ({ok: response.ok, headers: response.headers, json: data}))) // ick + .then((obj) => { + if (!obj.ok) { + handle_err(); + return; + } + + if (delay_ms === 0) { + process_update_response(obj.json, obj.headers); + } else { + setTimeout(function() { process_update_response(obj.json, obj.headers); }, delay_ms); + } + + // Next update. + if (!backend_url.match(/history/)) { + let timeout = 100; + current_analysis_request_timer = setTimeout(function() { request_update(); }, timeout); + } + }) + .catch((err) => { + if (err.name === 'AbortError') { + // Aborted because we are switching backends. Abandon and don't retry, + // because another one is already started for us. + } else { + console.log(err); + handle_err(err); + } + }) + .finally(() => { + // Display. + document.body.style.opacity = null; + }) + +} + +function process_update_response(data, headers) { + sync_server_clock(headers.get('Date')); + ims = headers.get('X-RGLM'); + let num_viewers = headers.get('X-RGNV'); + let new_data; + if (Array.isArray(data)) { + new_data = JSON.parse(JSON.stringify(current_analysis_data)); + JSON_delta.patch(new_data, data); + } else { + new_data = data; + } + + let minimum_version = headers.get('X-RGMV'); + if (minimum_version && minimum_version > SCRIPT_VERSION) { + // Upgrade to latest version with a force-reload. + location.reload(true); + } + + // Verify that the PV makes sense. + let valid = true; + if (new_data['pv']) { + let hiddenboard = new Chess(new_data['position']['fen']); + for (let i = 0; i < new_data['pv'].length; ++i) { + if (hiddenboard.move(new_data['pv'][i]) === null) { + valid = false; + break; + } + } + } + + if (valid) { + possibly_play_sound(current_analysis_data, new_data); + current_analysis_data = new_data; + update_board(); + update_num_viewers(num_viewers); + } else { + console.log("Received invalid update, waiting five seconds and trying again."); + setTimeout(function() { location.reload(true); }, 5000); + } +} + +function possibly_play_sound(old_data, new_data) { + if (!enable_sound) { + return; + } + if (old_data === null) { + return; + } + let ding = document.getElementById('ding'); + if (ding && ding.play) { + if (old_data['position'] && old_data['position']['fen'] && + new_data['position'] && new_data['position']['fen'] && + old_data['position']['fen'] !== new_data['position']['fen']) { + ding.play(); + } + } +} + +/** + * @type {!string} server_date_string + */ +function sync_server_clock(server_date_string) { + let server_time_ms = new Date(server_date_string).getTime(); + let client_time_ms = new Date().getTime(); + let estimated_offset_ms = server_time_ms - client_time_ms; + + // In order not to let the noise move us too much back and forth + // (the server only has one-second resolution anyway), we only + // change an existing skew if we are at least five seconds off. + if (client_clock_offset_ms === null || + Math.abs(estimated_offset_ms - client_clock_offset_ms) > 5000) { + client_clock_offset_ms = estimated_offset_ms; + } } -var clear_arrows = function() { - for (var i = 0; i < arrows.length; ++i) { +function clear_arrows() { + for (let i = 0; i < arrows.length; ++i) { if (arrows[i].svg) { - arrows[i].svg.parentElement.removeChild(arrows[i].svg); + arrows[i].svg.remove(); delete arrows[i].svg; } } arrows = []; occupied_by_arrows = []; - for (var y = 0; y < 8; ++y) { + for (let y = 0; y < 8; ++y) { occupied_by_arrows.push([false, false, false, false, false, false, false, false]); } } -var redraw_arrows = function() { - for (var i = 0; i < arrows.length; ++i) { +function redraw_arrows() { + for (let i = 0; i < arrows.length; ++i) { position_arrow(arrows[i]); } } +/** @param {!string} fen + * @return {!string} + * + * Return whose side it is to play (w or b), given a FEN. + */ +function find_toplay(fen) { + return fen.split(' ')[1]; +} + +/** @param {!string} fen + * @return {!number} + * + * Return the move clock, starting from 1. See also find_toplay(). + */ +function find_move_num(fen) { + return parseInt(fen.split(' ')[5]); +} + +/** @param {!string} fen + * @return {!number} + * + * Return the half-move clock, starting from 0 (and never resetting). + */ +function find_halfmove_num(fen) { + let move_num = find_move_num(fen); + let toplay = find_toplay(fen); + return (move_num - 1) * 2 + (toplay === 'w' ? 0 : 1); +} + /** @param {!number} x * @return {!number} */ -var sign = function(x) { +function sign(x) { if (x > 0) { return 1; } else if (x < 0) { @@ -122,11 +462,11 @@ var sign = function(x) { * @param {!string} to The square the arrow is to (e.g. e4). * @return {boolean} */ -var interfering_arrow = function(from, to) { - var from_col = from.charCodeAt(0) - "a1".charCodeAt(0); - var from_row = from.charCodeAt(1) - "a1".charCodeAt(1); - var to_col = to.charCodeAt(0) - "a1".charCodeAt(0); - var to_row = to.charCodeAt(1) - "a1".charCodeAt(1); +function interfering_arrow(from, to) { + let from_col = from.charCodeAt(0) - "a1".charCodeAt(0); + let from_row = from.charCodeAt(1) - "a1".charCodeAt(1); + let to_col = to.charCodeAt(0) - "a1".charCodeAt(0); + let to_row = to.charCodeAt(1) - "a1".charCodeAt(1); occupied_by_arrows[from_row][from_col] = true; @@ -137,10 +477,10 @@ var interfering_arrow = function(from, to) { } // Sliding piece: Check if anything except the from-square is seen before. - var dx = sign(to_col - from_col); - var dy = sign(to_row - from_row); - var x = from_col; - var y = from_row; + let dx = sign(to_col - from_col); + let dy = sign(to_row - from_row); + let x = from_col; + let y = from_row; do { x += dx; y += dy; @@ -163,16 +503,16 @@ var interfering_arrow = function(from, to) { * @param {!number} u * @return {!string} The point in "x y" form, suitable for SVG paths. */ -var point_from_start = function(x1, y1, x2, y2, t, u) { - var dx = x2 - x1; - var dy = y2 - y1; +function point_from_start(x1, y1, x2, y2, t, u) { + let dx = x2 - x1; + let dy = y2 - y1; - var norm = 1.0 / Math.sqrt(dx * dx + dy * dy); + let norm = 1.0 / Math.sqrt(dx * dx + dy * dy); dx *= norm; dy *= norm; - var x = x1 + dx * t + dy * u; - var y = y1 + dy * t - dx * u; + let x = x1 + dx * t + dy * u; + let y = y1 + dy * t - dx * u; return x + " " + y; } @@ -186,58 +526,65 @@ var point_from_start = function(x1, y1, x2, y2, t, u) { * @param {!number} u * @return {!string} The point in "x y" form, suitable for SVG paths. */ -var point_from_end = function(x1, y1, x2, y2, t, u) { - var dx = x2 - x1; - var dy = y2 - y1; +function point_from_end(x1, y1, x2, y2, t, u) { + let dx = x2 - x1; + let dy = y2 - y1; - var norm = 1.0 / Math.sqrt(dx * dx + dy * dy); + let norm = 1.0 / Math.sqrt(dx * dx + dy * dy); dx *= norm; dy *= norm; - var x = x2 + dx * t + dy * u; - var y = y2 + dy * t - dx * u; + let x = x2 + dx * t + dy * u; + let y = y2 + dy * t - dx * u; return x + " " + y; } -var position_arrow = function(arrow) { +function position_arrow(arrow) { if (arrow.svg) { - arrow.svg.parentElement.removeChild(arrow.svg); + if (arrow.svg.parentElement) { + arrow.svg.parentElement.removeChild(arrow.svg); + } delete arrow.svg; } - if (current_display_line !== null) { + if (current_display_line !== null && !current_display_line_is_history) { return; } - var pos = $(".square-a8").position(); - - var zoom_factor = $("#board").width() / 400.0; - var line_width = arrow.line_width * zoom_factor; - var arrow_size = arrow.arrow_size * zoom_factor; - - var square_width = $(".square-a8").width(); - var from_y = (7 - arrow.from_row + 0.5)*square_width; - var to_y = (7 - arrow.to_row + 0.5)*square_width; - var from_x = (arrow.from_col + 0.5)*square_width; - var to_x = (arrow.to_col + 0.5)*square_width; + // We always draw as if the board is 400x400, the viewBox will adjust that for us + let line_width = arrow.line_width; + let arrow_size = arrow.arrow_size; + + let square_width = 400 / 8; + let from_y, to_y, from_x, to_x; + if (board.orientation() === 'black') { + from_y = (arrow.from_row + 0.5)*square_width; + to_y = (arrow.to_row + 0.5)*square_width; + from_x = (7 - arrow.from_col + 0.5)*square_width; + to_x = (7 - arrow.to_col + 0.5)*square_width; + } else { + from_y = (7 - arrow.from_row + 0.5)*square_width; + to_y = (7 - arrow.to_row + 0.5)*square_width; + from_x = (arrow.from_col + 0.5)*square_width; + to_x = (arrow.to_col + 0.5)*square_width; + } - var SVG_NS = "http://www.w3.org/2000/svg"; - var XHTML_NS = "http://www.w3.org/1999/xhtml"; - var svg = document.createElementNS(SVG_NS, "svg"); - svg.setAttribute("width", /** @type{number} */ ($("#board").width())); - svg.setAttribute("height", /** @type{number} */ ($("#board").height())); - svg.setAttribute("style", "position: absolute"); - svg.setAttribute("position", "absolute"); + let SVG_NS = "http://www.w3.org/2000/svg"; + let XHTML_NS = "http://www.w3.org/1999/xhtml"; + let svg = document.createElementNS(SVG_NS, "svg"); + svg.setAttribute("width", "100%"); + svg.setAttribute("height", "100%"); + svg.setAttribute("viewBox", "0 0 400 400"); svg.setAttribute("version", "1.1"); svg.setAttribute("class", "c1"); svg.setAttribute("xmlns", XHTML_NS); - var x1 = from_x; - var y1 = from_y; - var x2 = to_x; - var y2 = to_y; + let x1 = from_x; + let y1 = from_y; + let x2 = to_x; + let y2 = to_y; // Draw the line. - var outline = document.createElementNS(SVG_NS, "path"); + let outline = document.createElementNS(SVG_NS, "path"); outline.setAttribute("d", "M " + point_from_start(x1, y1, x2, y2, arrow_size / 2, 0) + " L " + point_from_end(x1, y1, x2, y2, -arrow_size / 2, 0)); outline.setAttribute("xmlns", XHTML_NS); outline.setAttribute("stroke", "#666"); @@ -245,7 +592,7 @@ var position_arrow = function(arrow) { outline.setAttribute("fill", "none"); svg.appendChild(outline); - var path = document.createElementNS(SVG_NS, "path"); + let path = document.createElementNS(SVG_NS, "path"); path.setAttribute("d", "M " + point_from_start(x1, y1, x2, y2, arrow_size / 2, 0) + " L " + point_from_end(x1, y1, x2, y2, -arrow_size / 2, 0)); path.setAttribute("xmlns", XHTML_NS); path.setAttribute("stroke", arrow.fg_color); @@ -254,7 +601,7 @@ var position_arrow = function(arrow) { svg.appendChild(path); // Then the arrow head. - var head = document.createElementNS(SVG_NS, "path"); + let head = document.createElementNS(SVG_NS, "path"); head.setAttribute("d", "M " + point_from_end(x1, y1, x2, y2, 0, 0) + " L " + point_from_end(x1, y1, x2, y2, -arrow_size, -arrow_size / 2) + @@ -267,8 +614,11 @@ var position_arrow = function(arrow) { head.setAttribute("fill", arrow.fg_color); svg.appendChild(head); - $(svg).css({ top: pos.top, left: pos.left }); - document.body.appendChild(svg); + svg.style.position = 'absolute'; + svg.style.top = '0px'; /* Border for .board-b72b1. */ + svg.style.left = '0px'; + svg.style.pointerEvents = 'none'; + document.getElementById('board').appendChild(svg); arrow.svg = svg; } @@ -279,14 +629,14 @@ var position_arrow = function(arrow) { * @param {number} line_width * @param {number} arrow_size */ -var create_arrow = function(from_square, to_square, fg_color, line_width, arrow_size) { - var from_col = from_square.charCodeAt(0) - "a1".charCodeAt(0); - var from_row = from_square.charCodeAt(1) - "a1".charCodeAt(1); - var to_col = to_square.charCodeAt(0) - "a1".charCodeAt(0); - var to_row = to_square.charCodeAt(1) - "a1".charCodeAt(1); +function create_arrow(from_square, to_square, fg_color, line_width, arrow_size) { + let from_col = from_square.charCodeAt(0) - "a1".charCodeAt(0); + let from_row = from_square.charCodeAt(1) - "a1".charCodeAt(1); + let to_col = to_square.charCodeAt(0) - "a1".charCodeAt(0); + let to_row = to_square.charCodeAt(1) - "a1".charCodeAt(1); // Create arrow. - var arrow = { + let arrow = { from_col: from_col, from_row: from_row, to_col: to_col, @@ -300,17 +650,9 @@ var create_arrow = function(from_square, to_square, fg_color, line_width, arrow_ arrows.push(arrow); } -var compare_by_sort_key = function(refutation_lines, a, b) { - var ska = refutation_lines[a]['sort_key']; - var skb = refutation_lines[b]['sort_key']; - if (ska < skb) return -1; - if (ska > skb) return 1; - return 0; -}; - -var compare_by_score = function(refutation_lines, a, b) { - var sa = parseInt(refutation_lines[b]['score_sort_key'], 10); - var sb = parseInt(refutation_lines[a]['score_sort_key'], 10); +function compare_by_score(refutation_lines, invert, a, b) { + let sa = compute_score_sort_key(refutation_lines[b]['score'], refutation_lines[b]['depth'], invert); + let sb = compute_score_sort_key(refutation_lines[a]['score'], refutation_lines[a]['depth'], invert); return sa - sb; } @@ -321,24 +663,26 @@ var compare_by_score = function(refutation_lines, a, b) { * @param {!Object} data * @param {number} margin The maximum number of centipawns worse than the * best move can be and still be included. - * @return {Array.} The UCI representation (e.g. e1g1) of all + * @param {boolean} invert Whether black is to play. + * @return {Array.} The FEN representation (e.g. Ne4) of all * moves, in score order. */ -var find_nonstupid_moves = function(data, margin) { +function find_nonstupid_moves(data, margin, invert) { // First of all, if there are any moves that are more than 0.5 ahead of // the primary move, the refutation lines are probably bunk, so just // kill them all. - var best_score = undefined; - var pv_score = undefined; - for (var move in data['refutation_lines']) { - var score = parseInt(data['refutation_lines'][move]['score_sort_key'], 10); - if (move == data['pv_uci'][0]) { + let best_score = undefined; + let pv_score = undefined; + for (let move in data['refutation_lines']) { + let line = data['refutation_lines'][move]; + let score = compute_score_sort_key(line['score'], line['depth'], invert); + if (move == data['pv'][0]) { pv_score = score; } if (best_score === undefined || score > best_score) { best_score = score; } - if (!(data['refutation_lines'][move]['depth'] >= 8)) { + if (line['depth'] < 8) { return []; } } @@ -349,15 +693,17 @@ var find_nonstupid_moves = function(data, margin) { // Now find all moves that are within “margin” of the best score. // The PV move will always be first. - var moves = []; - for (var move in data['refutation_lines']) { - var score = parseInt(data['refutation_lines'][move]['score_sort_key'], 10); - if (move != data['pv_uci'][0] && best_score - score <= margin) { + let moves = []; + for (let move in data['refutation_lines']) { + let line = data['refutation_lines'][move]; + let score = compute_score_sort_key(line['score'], line['depth'], invert); + if (move != data['pv'][0] && best_score - score <= margin) { moves.push(move); } } - moves = moves.sort(function(a, b) { return compare_by_score(data['refutation_lines'], a, b) }); - moves.unshift(data['pv_uci'][0]); + let toplay = find_toplay(data['position']['fen']); + moves = moves.sort(function(a, b) { return compare_by_score(data['refutation_lines'], toplay, a, b) }); + moves.unshift(data['pv'][0]); return moves; } @@ -366,257 +712,685 @@ var find_nonstupid_moves = function(data, margin) { * @param {number} x * @return {!string} */ -var thousands = function(x) { +function thousands(x) { return String(x).split('').reverse().join('').replace(/(\d{3}\B)/g, '$1,').split('').reverse().join(''); } /** - * @param {!string} fen - * @param {Array.} uci_pv - * @param {Array.} pretty_pv - * @param {number} move_num - * @param {!string} toplay + * @param {!string} start_fen + * @param {Array.} pv + * @param {Array<{ first_move: number, score: Object }>} scores + * @param {number} start_display_move_num * @param {number=} opt_limit * @param {boolean=} opt_showlast */ -var print_pv = function(fen, uci_pv, pretty_pv, move_num, toplay, opt_limit, opt_showlast) { +function add_pv(start_fen, pv, scores, start_display_move_num, opt_limit, opt_showlast) { display_lines.push({ - start_fen: fen, - uci_pv: uci_pv, - pretty_pv: pretty_pv + start_fen: start_fen, + pv: pv, + scores: scores, + start_display_move_num: start_display_move_num }); + let splicepos = null; + if (scores !== null && scores.length >= 1 && + scores[scores.length - 1].score !== undefined && + scores[scores.length - 1].score !== null && + (scores[scores.length - 1].score[0] === 'T' || + scores[scores.length - 1].score[0] === 't')) { + splicepos = scores[scores.length - 1].score[1]; + } + return print_pv(display_lines.length - 1, splicepos, opt_limit, opt_showlast); +} - var pv = ''; - var i = 0; - if (opt_limit && opt_showlast) { - // Truncate the PV at the beginning (instead of at the end). - // We assume here that toplay is 'W'. - pv = '(…) '; - i = pretty_pv.length - opt_limit; - if (i % 2 == 1) { - ++i; - } - move_num += i / 2; - } else if (toplay == 'B') { - var move = "" + pretty_pv[0] + ""; - pv = move_num + '. … ' + move; - toplay = 'W'; - ++i; - ++move_num; - } - for ( ; i < pretty_pv.length; ++i) { - var move = "" + pretty_pv[i] + ""; - - if (toplay == 'W') { - if (i > opt_limit && !opt_showlast) { - return pv + ' (…)'; +/** + * @param {number} line_num + * @param {?number} splicepos If non-null, where the tablebase-spliced portion of the TB starts. + * @param {number=} opt_limit If set, show at most this number of moves. + * @param {boolean=} opt_showlast If limit is set, show the last moves instead of the first ones. + */ +function print_pv(line_num, splicepos, opt_limit, opt_showlast) { + let display_line = display_lines[line_num]; + let pv = display_line.pv; + let halfmove_num = find_halfmove_num(display_line.start_fen) + 2; // From two, for simplicity. + let start_halfmove_num = halfmove_num; + + let ret = document.createDocumentFragment(); + + // Truncate PV at the start if needed. + let to_skip = display_line.start_display_move_num; + if (opt_limit && opt_showlast && pv.length - to_skip > opt_limit) { + // Explicit (UI-visible) truncation from the start, for the history. + ret.appendChild(document.createTextNode('(')); + let link = document.createElement('a'); + link.className = 'move'; + link.href = 'javascript:collapse_history(false)'; + link.textContent = '…'; + ret.appendChild(link); + ret.appendChild(document.createTextNode(') ')); + to_skip = pv.length - opt_limit; + to_skip += to_skip % 2; // Make sure it starts on a white move. + } + if (to_skip > 0) { + pv = pv.slice(to_skip); + halfmove_num += to_skip; + if (splicepos !== null) { + splicepos -= to_skip; + if (splicepos < 0) { + splicepos = 0; } - if (pv != '') { - pv += ' '; + } + } + + // The initial move number needs to go before any (TB: …) marker. + if (halfmove_num % 2 == 1) { + // Black move. + ret.appendChild(document.createTextNode((halfmove_num - 1) / 2 + '. … ')); + } else { + // White move. + ret.appendChild(document.createTextNode(halfmove_num / 2 + '. ')); + } + let in_tb = false; + for (let i = 0; i < pv.length; ++i, ++halfmove_num) { + let prefix = ''; + if (splicepos === i) { + prefix = '(TB:'; + in_tb = true; + } + + if (halfmove_num % 2 == 0 && i != 0) { + if (i > opt_limit && !opt_showlast) { + if (in_tb) { + prefix += ')'; + } + ret.appendChild(document.createTextNode(prefix + ' (…)')); + return ret; } - pv += move_num + '. ' + move; - ++move_num; - toplay = 'B'; + prefix += ' ' + (halfmove_num / 2) + '. '; } else { - pv += ' ' + move; - toplay = 'W'; + prefix += ' '; } + ret.appendChild(document.createTextNode(prefix)); + + let link = document.createElement('a'); + link.className = 'move'; + link.setAttribute('id', 'automove' + line_num + '-' + (halfmove_num - start_halfmove_num)); + link.textContent = pv[i]; + link.href = 'javascript:show_line(' + line_num + ', ' + (halfmove_num - start_halfmove_num) + ');'; + ret.appendChild(link); + } + if (in_tb) { + ret.appendChild(document.createTextNode(')')); } - return pv; + return ret; } -var update_highlight = function() { - $("#board").find('.square-55d63').removeClass('nonuglyhighlight'); - if (current_display_line === null && highlight_from !== undefined && highlight_to !== undefined) { - $("#board").find('.square-' + highlight_from).addClass('nonuglyhighlight'); - $("#board").find('.square-' + highlight_to).addClass('nonuglyhighlight'); +/** Update the highlighted to/from squares on the board. + * Based on the global "highlight_from" and "highlight_to" letiables. + */ +function update_board_highlight() { + document.getElementById("board").querySelectorAll('.square-55d63').forEach((square) => square.classList.remove('nonuglyhighlight')); + if ((current_display_line === null || current_display_line_is_history) && + highlight_from !== undefined && highlight_to !== undefined) { + document.getElementById("board").querySelector('.square-' + highlight_from).classList.add('nonuglyhighlight'); + document.getElementById("board").querySelector('.square-' + highlight_to).classList.add('nonuglyhighlight'); + } +} + +function update_history() { + let history = document.getElementById('history'); + if (display_lines[0] === null || display_lines[0].pv.length == 0) { + history.textContent = 'No history'; + } else if (truncate_display_history) { + history.replaceChildren(print_pv(0, null, 8, true)); + } else { + history.textContent = '('; + let link = document.createElement('a'); + link.className = 'move'; + link.href = 'javascript:collapse_history(true)'; + link.textContent = 'collapse'; + history.appendChild(link); + history.appendChild(document.createTextNode(') ')); + history.append(print_pv(0, null)); + } +} + +/** + * @param {!boolean} truncate_history + */ +function collapse_history(truncate_history) { + truncate_display_history = truncate_history; + update_history(); +} +window['collapse_history'] = collapse_history; + +function choose_displayed_refutation_lines() { + if (hash_refutation_lines) { + // If we're in hash exploration, that takes precedence. + return [hash_refutation_lines, hash_refutation_lines_base_fen]; + } else { + let data = displayed_analysis_data || current_analysis_data; + return [data['refutation_lines'], data['position']['fen']]; } } -var update_refutation_lines = function() { - if (fen === null) { +/** Update the HTML display of multi-PV. + * + * Also recreates the global "display_lines". + */ +function update_refutation_lines() { + const [refutation_lines, refutation_lines_base_fen] = choose_displayed_refutation_lines(); + if (!refutation_lines) { return; } - if (display_lines.length > 1) { - display_lines = [ display_lines[0] ]; + if (display_lines.length > 2) { + // Truncate so that only the history and PV is left. + display_lines = [ display_lines[0], display_lines[1] ]; + } + let tbl = document.getElementById("refutationlines"); + tbl.replaceChildren(); + + if (display_lines.length < 2) { + // Update the move highlight, as we've rewritten all the HTML. + update_move_highlight(); + return; } - var tbl = $("#refutationlines"); - tbl.empty(); + // Find out where the lines start from. + let base_line = []; + let base_scores = display_lines[1].scores; + let start_display_move_num = 0; + if (hash_refutation_lines) { + base_line = current_display_line.pv.slice(0, current_display_move + 1); + base_scores = current_display_line.scores; + start_display_move_num = base_line.length; + } - var moves = []; - for (var move in refutation_lines) { + let moves = []; + for (let move in refutation_lines) { moves.push(move); } - var compare = sort_refutation_lines_by_score ? compare_by_score : compare_by_sort_key; - moves = moves.sort(function(a, b) { return compare(refutation_lines, a, b) }); - for (var i = 0; i < moves.length; ++i) { - var line = refutation_lines[moves[i]]; - var tr = document.createElement("tr"); + let invert = (find_toplay(refutation_lines_base_fen) === 'b'); + if (current_display_line && current_display_move % 2 == 0 && !current_display_line_is_history) { + invert = !invert; + } + moves = moves.sort(function(a, b) { return compare_by_score(refutation_lines, invert, a, b) }); + for (let i = 0; i < moves.length; ++i) { + let line = refutation_lines[moves[i]]; + + let tr = document.createElement("tr"); - var move_td = document.createElement("td"); + let move_td = document.createElement("td"); tr.appendChild(move_td); - $(move_td).addClass("move"); - if (line['pv_uci'].length == 0) { - $(move_td).text(line['pretty_move']); - } else { - var move = "" + line['pretty_move'] + ""; - $(move_td).html(move); + move_td.classList.add("move"); + + let scores = base_scores.concat([{ first_move: start_display_move_num, score: line['score'] }]); + + if (line['pv'].length == 0) { + // Not found, so just make a one-move PV. + let link = document.createElement('a'); + link.className = 'move'; + link.href = 'javascript:show_line(' + display_lines.length + ', ' + 0 + ')'; + link.textContent = line['move']; + move_td.replaceChildren(link); + + let score_td = document.createElement("td"); + score_td.classList.add("score"); + score_td.textContent = "—"; + tr.appendChild(score_td); + + let depth_td = document.createElement("td"); + tr.appendChild(depth_td); + depth_td.classList.add("depth"); + depth_td.textContent = "—"; + + let pv_td = document.createElement("td"); + tr.appendChild(pv_td); + pv_td.classList.add("pv"); + pv_td.append(add_pv(refutation_lines_base_fen, base_line.concat([ line['move'] ]), scores, start_display_move_num)); + + tbl.append(tr); + continue; } - var score_td = document.createElement("td"); + let move_link = document.createElement("a"); + move_link.classList.add("move"); + move_link.setAttribute("href", "javascript:show_line(" + display_lines.length + ", 0)"); + move_link.textContent = line['move']; + move_td.appendChild(move_link); + + let score_td = document.createElement("td"); tr.appendChild(score_td); - $(score_td).addClass("score"); - $(score_td).text(line['pretty_score']); + score_td.classList.add("score"); + score_td.textContent = format_short_score(line['score']); - var depth_td = document.createElement("td"); + let depth_td = document.createElement("td"); tr.appendChild(depth_td); - $(depth_td).addClass("depth"); - $(depth_td).text("d" + line['depth']); + depth_td.classList.add("depth"); + if (line['depth'] && line['depth'] >= 0) { + depth_td.textContent = "d" + line['depth']; + } else { + depth_td.textContent = "—"; + } - var pv_td = document.createElement("td"); + let pv_td = document.createElement("td"); tr.appendChild(pv_td); - $(pv_td).addClass("pv"); - $(pv_td).html(print_pv(fen, line['pv_uci'], line['pv_pretty'], move_num, toplay, 10)); + pv_td.classList.add("pv"); + pv_td.append(add_pv(refutation_lines_base_fen, base_line.concat(line['pv']), scores, start_display_move_num, 10)); tbl.append(tr); } - // Make one of the links clickable and the other nonclickable. - if (sort_refutation_lines_by_score) { - $("#sortbyscore0").html("Move"); - $("#sortbyscore1").html("Score"); - } else { - $("#sortbyscore0").html("Move"); - $("#sortbyscore1").html("Score"); - } + // Update the move highlight, as we've rewritten all the HTML. + update_move_highlight(); } /** - * @param {Object} data - * @param {number} num_viewers + * Create a Chess.js board object, containing the given position plus the given moves, + * up to the given limit. + * + * @param {?string} fen + * @param {Array.} moves + * @param {number} last_move */ -var update_board = function(data, num_viewers) { - display_lines = []; - - // The headline. - var headline; - if (data['position']['player_w'] && data['position']['player_b']) { - headline = data['position']['player_w'] + '–' + - data['position']['player_b'] + ', analysis'; - } else { - headline = 'Analysis'; +function chess_from(fen, moves, last_move) { + let hiddenboard = new Chess(); + if (fen !== null && fen !== undefined) { + hiddenboard.load(fen); } - if (data['position']['last_move'] !== 'none') { - headline += ' after ' - if (data['position']['toplay'] == 'W') { - headline += (data['position']['move_num']-1) + '… '; + for (let i = 0; i <= last_move; ++i) { + if (moves[i] === '0-0') { + hiddenboard.move('O-O'); + } else if (moves[i] === '0-0-0') { + hiddenboard.move('O-O-O'); } else { - headline += data['position']['move_num'] + '. '; + hiddenboard.move(moves[i]); } - headline += data['position']['last_move']; } + return hiddenboard; +} - $("#headline").text(headline); +function update_game_list(games) { + document.getElementById("games").textContent = ""; + if (games === null) { + return; + } - if (num_viewers === null) { - $("#numviewers").text(""); - } else if (num_viewers == 1) { - $("#numviewers").text("You are the only current viewer"); - } else { - $("#numviewers").text(num_viewers + " current viewers"); + let games_div = document.getElementById('games'); + for (let game_num = 0; game_num < games.length; ++game_num) { + let game = games[game_num]; + let game_span = document.createElement("span"); + game_span.setAttribute("class", "game"); + + let game_name = document.createTextNode(game['name']); + if (game['url'] === backend_url) { + // This game. + game_span.appendChild(game_name); + + if (current_analysis_data && current_analysis_data['position']) { + let score; + if (current_analysis_data['position']['result']) { + score = " (" + current_analysis_data['position']['result'] + ")"; + } else { + score = " (" + format_short_score(current_analysis_data['score']) + ")"; + } + game_span.appendChild(document.createTextNode(score)); + } + } else { + // Some other game. + let game_a = document.createElement("a"); + game_a.setAttribute("href", "#" + game['id']); + game_a.appendChild(game_name); + game_span.appendChild(game_a); + + let score; + if (game['result']) { + score = " (" + game['result'] + ")"; + } else { + score = " (" + format_short_score(game['score']) + ")"; + } + game_span.appendChild(document.createTextNode(score)); + } + + games_div.appendChild(game_span); } +} - // The engine id. - if (data['id'] && data['id']['name'] !== null) { - $("#engineid").text(data['id']['name']); +/** + * Try to find a running game that matches with the current hash, + * and switch to it if we're not already displaying it. + */ +function possibly_switch_game_from_hash() { + let history_match = window.location.hash.match(/^#history=([a-zA-Z0-9_-]+)/); + if (history_match !== null) { + let game_id = history_match[1]; + let fake_game = { + url: '/history/' + game_id + '.json', + hashurl: '', + id: 'history=' + game_id + }; + switch_backend(fake_game); + return; } - // The score. - if (data['score'] !== null) { - $("#score").text(data['score']); + if (current_games === null) { + return; } - // The search stats. - if (data['nodes'] && data['nps'] && data['depth']) { - var stats = thousands(data['nodes']) + ' nodes, ' + thousands(data['nps']) + ' nodes/sec, depth ' + data['depth'] + ' ply'; - if (data['seldepth']) { - stats += ' (' + data['seldepth'] + ' selective)'; - } - if (data['tbhits'] && data['tbhits'] > 0) { - if (data['tbhits'] == 1) { - stats += ', one Syzygy hit'; - } else { - stats += ', ' + thousands(data['tbhits']) + ' Syzygy hits'; + let hash = window.location.hash.replace(/^#/,''); + for (let i = 0; i < current_games.length; ++i) { + if (current_games[i]['id'] === hash) { + if (backend_url !== current_games[i]['url']) { + switch_backend(current_games[i]); } + return; } + } +} - $("#searchstats").text(stats); +/** + * If this is a Chess960 castling which doesn't move the king, + * move the rook instead. +*/ +function patch_move(move) { + if (move === null) return null; + if (move.from !== move.to) return move; + + let f = move.rook_sq & 15; + let r = move.rook_sq >> 4; + let from = ('abcdefgh'.substring(f,f+1) + '87654321'.substring(r,r+1)); + let to = move.to; + + if (move.to === 'g1') { + to = 'f1'; + } else if (move.to === 'g8') { + to = 'f8'; + } else if (move.to === 'b1') { + to = 'c1'; + } else if (move.to === 'b8') { + to = 'c8'; } - // Update the board itself. - fen = data['position']['fen']; - update_displayed_line(); + return { from: from, to: to }; +} - if (data['position']['last_move_uci']) { - highlight_from = data['position']['last_move_uci'].substr(0, 2); - highlight_to = data['position']['last_move_uci'].substr(2, 4); +/** Update all the HTML on the page, based on current global state. + */ +function update_board() { + document.body.style.opacity = null; + + let data = displayed_analysis_data || current_analysis_data; + let current_data = current_analysis_data; // Convenience alias. + + display_lines = []; + + // Print the history. This is pretty much the only thing that's + // unconditionally taken from current_data (we're not interested in + // historic history). + if (current_data['position']['history']) { + let start = (current_data['position'] && current_data['position']['start_fen']) ? current_data['position']['start_fen'] : 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1'; + add_pv(start, current_data['position']['history'], null, 0, 8, true); } else { - highlight_from = highlight_to = undefined; + display_lines.push(null); } - update_highlight(); + update_history(); - // Print the history. - if (data['position']['history']) { - $("#history").html(print_pv('start', data['position']['history'], data['position']['pretty_history'], 1, 'W', 8, true)); + // Games currently in progress, if any. + if (current_data['games']) { + current_games = current_data['games']; + possibly_switch_game_from_hash(); + } else { + current_games = null; + } + update_game_list(current_games); + + // The headline. Names are always fetched from current_data; + // the rest can depend a bit. + let headline; + if (current_data && + current_data['position']['player_w'] && current_data['position']['player_b']) { + headline = current_data['position']['player_w'] + '–' + + current_data['position']['player_b'] + ', analysis'; } else { - $("#history").html("No history"); + headline = 'Analysis'; } - // Print the PV. - $("#pv").html(print_pv(data['position']['fen'], data['pv_uci'], data['pv_pretty'], data['position']['move_num'], data['position']['toplay'])); + // Credits: The engine name/version. + if (current_data['engine'] && current_data['engine']['name'] !== null) { + document.getElementById("engineid").textContent = current_data['engine']['name']; + } - // Update the PV arrow. + // Credits: The engine URL. + if (current_data['engine'] && current_data['engine']['url']) { + document.getElementById("engineid").setAttribute("href", current_data['engine']['url']); + } else { + document.getElementById("engineid").removeAttribute("href"); + } + + // Credits: Engine details. + if (current_data['engine'] && current_data['engine']['details']) { + document.getElementById("enginedetails").textContent = " (" + current_data['engine']['details'] + ")"; + } else { + document.getElementById("enginedetails").textContent = ""; + } + + // Credits: Move source, possibly with URL. + if (current_data['move_source'] && current_data['move_source_url']) { + document.getElementById("movesource").textContent = "Moves provided by "; + let movesource_a = document.createElement("a"); + movesource_a.setAttribute("href", current_data['move_source_url']); + let movesource_text = document.createTextNode(current_data['move_source']); + movesource_a.appendChild(movesource_text); + let movesource_period = document.createTextNode("."); + document.getElementById("movesource").appendChild(movesource_a); + document.getElementById("movesource").appendChild(movesource_period); + } else if (current_data['move_source']) { + document.getElementById("movesource").textContent = "Moves provided by " + current_data['move_source'] + "."; + } else { + document.getElementById("movesource").textContent = ""; + } + + let last_move; + if (displayed_analysis_data) { + // Displaying some non-current position, pick out the last move + // from the history. This will work even if the fetch failed. + if (current_display_move !== -1) { + last_move = format_halfmove_with_number( + current_display_line.pv[current_display_move], + current_display_move); + headline += ' after ' + last_move; + } + } else if (data['position']['last_move'] !== 'none') { + // Find the previous move. + let previous_move_num, previous_toplay; + let fen = data['position']['fen']; + if (find_toplay(fen) === 'b') { + previous_move_num = find_move_num(fen); + previous_toplay = 'w'; + } else { + previous_move_num = find_move_num(fen) - 1; + previous_toplay = 'b'; + } + + last_move = format_move_with_number( + data['position']['last_move'], + previous_move_num, + previous_toplay == 'w'); + headline += ' after ' + last_move; + } else { + last_move = null; + } + document.getElementById("headline").textContent = headline; + + // The contains a very brief headline. + let title_elems = []; + if (data['position'] && data['position']['result']) { + title_elems.push(data['position']['result']); + } else if (data['score']) { + title_elems.push(format_short_score(data['score'])); + } + if (last_move !== null) { + title_elems.push(last_move); + } + + if (title_elems.length != 0) { + document.title = '(' + title_elems.join(', ') + ') analysis.sesse.net'; + } else { + document.title = 'analysis.sesse.net'; + } + + // The last move (shown by highlighting the from and to squares). + if (data['position'] && data['position']['last_move_uci']) { + highlight_from = data['position']['last_move_uci'].substr(0, 2); + highlight_to = data['position']['last_move_uci'].substr(2, 2); + } else if (current_display_line_is_history && current_display_line && current_display_move >= 0) { + // We don't have historic analysis for this position, but we + // can reconstruct what the last move was by just replaying + // from the start. + let position = (data['position'] && data['position']['start_fen']) ? data['position']['start_fen'] : null; + let hiddenboard = chess_from(position, current_display_line.pv, current_display_move); + let moves = hiddenboard.history({ verbose: true }); + last_move = moves.pop(); + highlight_from = last_move.from; + highlight_to = last_move.to; + } else { + highlight_from = highlight_to = undefined; + } + update_board_highlight(); + + if (data['failed']) { + document.getElementById("score").textContent = "No analysis for this move"; + document.getElementById("pvtitle").textContent = "PV:"; + document.getElementById("pv").replaceChildren(); + document.getElementById("searchstats").innerHTML = " "; + document.getElementById("refutationlines").replaceChildren(); + document.getElementById("whiteclock").replaceChildren(); + document.getElementById("blackclock").replaceChildren(); + update_refutation_lines(); + clear_arrows(); + update_displayed_line(); + update_move_highlight(); + return; + } + + if (clock_timer !== null) { + clearTimeout(clock_timer); + } + update_clock(); + + // The score. + if (current_display_line && !current_display_line_is_history) { + let score; + if (current_display_line.scores && current_display_line.scores.length > 0) { + for (let i = 0; i < current_display_line.scores.length; ++i) { + if (current_display_move < current_display_line.scores[i].first_move) { + break; + } + score = current_display_line.scores[i].score; + } + } + if (score) { + document.getElementById("score").textContent = format_long_score(score); + } else { + document.getElementById("score").textContent = "No score for this line"; + } + } else if (data['score']) { + document.getElementById("score").textContent = format_long_score(data['score']); + } + + // The search stats. + if (data['searchstats']) { + document.getElementById("searchstats").textContent = data['searchstats']; + } else if (data['nodes'] && data['nps'] && data['depth']) { + let stats = thousands(data['nodes']) + ' nodes, ' + thousands(data['nps']) + ' nodes/sec, depth ' + data['depth'] + ' ply'; + if (data['seldepth']) { + stats += ' (' + data['seldepth'] + ' selective)'; + } + if (data['tbhits'] && data['tbhits'] > 0) { + if (data['tbhits'] == 1) { + stats += ', one Syzygy hit'; + } else { + stats += ', ' + thousands(data['tbhits']) + ' Syzygy hits'; + } + } + + document.getElementById("searchstats").textContent = stats; + } else { + document.getElementById("searchstats").textContent = ""; + } + if (admin_password !== null) { + document.getElementById("searchstats").innerHTML += " | <span style=\"color: red;\">ADMIN MODE (if password is right) | <a href=\"javascript:undo_move()\">Undo move</a></span>"; + } + + // Update the board itself. + base_fen = data['position']['fen']; + update_displayed_line(); + + // Print the PV. + document.getElementById("pvtitle").textContent = "PV:"; + + let scores = [{ first_move: -1, score: data['score'] }]; + document.getElementById("pv").replaceChildren(add_pv(data['position']['fen'], data['pv'], scores, 0)); + + // Update the PV arrow. clear_arrows(); - if (data['pv_uci'].length >= 1) { + let toplay = find_toplay(data['position']['fen']); + if (data['pv'].length >= 1) { + let hiddenboard = new Chess(base_fen); + // draw a continuation arrow as long as it's the same piece - for (var i = 0; i < data['pv_uci'].length; i += 2) { - var from = data['pv_uci'][i].substr(0, 2); - var to = data['pv_uci'][i].substr(2,4); - if ((i >= 2 && from != data['pv_uci'][i - 2].substr(2, 4)) || - interfering_arrow(from, to)) { + let last_to; + for (let i = 0; i < data['pv'].length; i += 2) { + let move = patch_move(hiddenboard.move(data['pv'][i])); + + if ((i >= 2 && move.from != last_to) || + interfering_arrow(move.from, move.to)) { break; } - create_arrow(from, to, '#f66', 6, 20); + create_arrow(move.from, move.to, '#f66', 6, 20); + last_to = move.to; + hiddenboard.move(data['pv'][i + 1]); // To keep continuity. } - var alt_moves = find_nonstupid_moves(data, 30); - for (var i = 1; i < alt_moves.length && i < 3; ++i) { - create_arrow(alt_moves[i].substr(0, 2), - alt_moves[i].substr(2, 4), '#f66', 1, 10); + let alt_moves = find_nonstupid_moves(data, 30, toplay === 'b'); + for (let i = 1; i < alt_moves.length && i < 3; ++i) { + hiddenboard = new Chess(base_fen); + let move = patch_move(hiddenboard.move(alt_moves[i])); + if (move !== null) { + create_arrow(move.from, move.to, '#f66', 1, 10); + } } } // See if all semi-reasonable moves have only one possible response. - if (data['pv_uci'].length >= 2) { - var nonstupid_moves = find_nonstupid_moves(data, 300); - var response = data['pv_uci'][1]; - for (var i = 0; i < nonstupid_moves.length; ++i) { - if (nonstupid_moves[i] == data['pv_uci'][0]) { + if (data['pv'].length >= 2) { + let nonstupid_moves = find_nonstupid_moves(data, 300, toplay === 'b'); + let hiddenboard = new Chess(base_fen); + hiddenboard.move(data['pv'][0]); + let response = hiddenboard.move(data['pv'][1]); + for (let i = 0; i < nonstupid_moves.length; ++i) { + if (nonstupid_moves[i] == data['pv'][0]) { // ignore the PV move for refutation lines. continue; } if (!data['refutation_lines'] || !data['refutation_lines'][nonstupid_moves[i]] || - !data['refutation_lines'][nonstupid_moves[i]]['pv_uci'] || - data['refutation_lines'][nonstupid_moves[i]]['pv_uci'].length < 1) { + !data['refutation_lines'][nonstupid_moves[i]]['pv'] || + data['refutation_lines'][nonstupid_moves[i]]['pv'].length < 2) { // Incomplete PV, abort. response = undefined; break; } - var this_response = data['refutation_lines'][nonstupid_moves[i]]['pv_uci'][1]; - if (response !== this_response) { + let line = data['refutation_lines'][nonstupid_moves[i]]; + hiddenboard = new Chess(base_fen); + hiddenboard.move(line['pv'][0]); + let this_response = hiddenboard.move(line['pv'][1]); + if (this_response === null) { + console.log("BUG: ", i); + console.log(data); + console.log(line['pv']); + } + if (response.from !== this_response.from || response.to !== this_response.to) { // Different response depending on lines, abort. response = undefined; break; @@ -624,127 +1398,1200 @@ var update_board = function(data, num_viewers) { } if (nonstupid_moves.length > 0 && response !== undefined) { - create_arrow(response.substr(0, 2), - response.substr(2, 4), '#66f', 6, 20); + create_arrow(response.from, response.to, '#66f', 6, 20); } } - // Update the refutation lines. - fen = data['position']['fen']; - move_num = data['position']['move_num']; - toplay = data['position']['toplay']; - refutation_lines = data['refutation_lines']; + base_fen = data['position']['fen']; update_refutation_lines(); - // Next update. - setTimeout(function() { request_update(); }, 100); + // Update the sparkline last, since its size depends on how everything else reflowed. + update_sparkline(data); +} + +function update_sparkline(data) { + let scorespark = document.getElementById('scoresparkcontainer'); + scorespark.textContent = ''; + if (data && data['score_history']) { + let first_move_num = undefined; + for (let halfmove_num in data['score_history']) { + halfmove_num = parseInt(halfmove_num); + if (first_move_num === undefined || halfmove_num < first_move_num) { + first_move_num = halfmove_num; + } + } + if (first_move_num !== undefined) { + let fen = data['position']['fen']; + let last_move_num = find_move_num(fen) * 2 - 3; + if (find_toplay(fen) === 'b') { + ++last_move_num; + } + + // Possibly truncate some moves if we don't have enough width. + let max_moves = Math.floor(scorespark.getBoundingClientRect().width / 5) - 3; + if (last_move_num - first_move_num > max_moves) { + first_move_num = last_move_num - max_moves; + } + + let min_score = -1; + let max_score = 1; + let last_score = null; + let scores = []; + for (let halfmove_num = first_move_num; halfmove_num <= last_move_num; ++halfmove_num) { + if (data['score_history'][halfmove_num]) { + let score = compute_plot_score(data['score_history'][halfmove_num]); + last_score = score; + if (score < min_score) min_score = score; + if (score > max_score) max_score = score; + } + scores.push(last_score); + } + if (data['score']) { + let score = compute_plot_score(data['score']); + scores.push(score); + if (score < min_score) min_score = score; + if (score > max_score) max_score = score; + } + if (max_score - min_score < 100) { + if (Math.abs(max_score) >= Math.abs(min_score)) { + max_score = min_score + 100; + } else { + min_score = max_score - 100; + } + } + + const h = scorespark.getBoundingClientRect().height; + + let base_y = h - h * min_score / (min_score - max_score); + for (let i = 0; i < scores.length; ++i) { + let rect = document.createElementNS('http://www.w3.org/2000/svg', 'rect'); + //rect.setAttributeNS(null, 'stroke', "#000000"); + rect.setAttributeNS(null, 'x', i * 5) + rect.setAttributeNS(null, 'width', 4); + let extent = scores[i] * h / (max_score - min_score); + if (extent > 0 && extent < 1) { + extent = 1; + } else if (extent < 0 && extent > -1) { + extent = -1; + } + + let color; + if (scores[i] === 0) { + color = [0.5, 0.5, 0.5]; + rect.setAttributeNS(null, 'y', base_y); + rect.setAttributeNS(null, 'height', 1); + } else if (scores[i] > 0) { + color = [0.2, 0.4, 0.8]; + rect.setAttributeNS(null, 'y', base_y - extent); + rect.setAttributeNS(null, 'height', extent + 1); + } else { + color = [1.0, 0.267, 0.267]; + rect.setAttributeNS(null, 'y', base_y); + rect.setAttributeNS(null, 'height', -extent + 1); + } + let hlcolor = [color[0], color[1], color[2]]; + if (scores[i] !== 0) { + hlcolor[0] = Math.min(hlcolor[0] * 1.4, 1.0); + hlcolor[1] = Math.min(hlcolor[1] * 1.4, 1.0); + hlcolor[2] = Math.min(hlcolor[2] * 1.4, 1.0); + } + rect.style.fill = 'rgb(' + color[0]*100.0 + '%, ' + color[1]*100.0 + '%, ' + color[2]*100.0 + '%)'; + + // score_history contains the Nth _position_, but format_tooltip + // wants to format the Nth _move_; thus the -1. + const tooltip = format_tooltip(data, i + first_move_num - 1); + rect.addEventListener('mouseenter', (e) => draw_hover(e, hlcolor, tooltip)); + rect.addEventListener('mousemove', (e) => draw_hover(e, hlcolor, tooltip)); + rect.addEventListener('mouseleave', (e) => hide_hover(e, color)); + rect.addEventListener('click', (e) => { hide_hover(e, color); show_line(0, i + first_move_num - 1) }); + scorespark.appendChild(rect); + } + } + } +} + +function draw_hover(e, color, tooltip) { + e.target.style.fill = 'rgb(' + color[0]*100.0 + '%, ' + color[1]*100.0 + '%, ' + color[2]*100.0 + '%)'; + + let hover = document.getElementById('sparklinehover'); + hover.textContent = tooltip; + hover.style.display = 'initial'; + + let left = Math.max(e.pageX + 10, window.pageXOffset); + let top = Math.max(e.pageY - hover.getBoundingClientRect().height, window.pageYOffset); + left = Math.min(left, window.pageXOffset + document.documentElement.clientWidth - hover.getBoundingClientRect().width); + + hover.style.left = left + 'px'; + hover.style.top = top + 'px'; + +} +function hide_hover(e, color) { + e.target.style.fill = 'rgb(' + color[0]*100.0 + '%, ' + color[1]*100.0 + '%, ' + color[2]*100.0 + '%)'; + document.getElementById('sparklinehover').style.display = 'none'; } /** - * @param {boolean} sort_by_score + * @param {number} num_viewers */ -var resort_refutation_lines = function(sort_by_score) { - sort_refutation_lines_by_score = sort_by_score; - update_refutation_lines(); +function update_num_viewers(num_viewers) { + let text = ""; + if (num_viewers === null) { + text = ""; + } else if (num_viewers == 1) { + text = "You are the only current viewer"; + } else { + text = num_viewers + " current viewers"; + } + if (display_fen !== null) { + let counter = Math.floor(display_fen.split(" ")[4] / 2); + if (counter >= 20) { + text = text.replace("current ", ""); + text += " | 50-move rule: " + counter; + } + } + document.getElementById("numviewers").textContent = text; +} + +function update_clock() { + clock_timer = null; + + let data = displayed_analysis_data || current_analysis_data; + if (!data) return; + + if (data['position']) { + let result = data['position']['result']; + if (result === '1-0') { + document.getElementById("whiteclock").textContent = "1"; + document.getElementById("blackclock").textContent = "0"; + document.getElementById("whiteclock").classList.remove("running-clock"); + document.getElementById("blackclock").classList.remove("running-clock"); + return; + } + if (result === '1/2-1/2') { + document.getElementById("whiteclock").textContent = "1/2"; + document.getElementById("blackclock").textContent = "1/2"; + document.getElementById("whiteclock").classList.remove("running-clock"); + document.getElementById("blackclock").classList.remove("running-clock"); + return; + } + if (result === '0-1') { + document.getElementById("whiteclock").textContent = "0"; + document.getElementById("blackclock").textContent = "1"; + document.getElementById("whiteclock").classList.remove("running-clock"); + document.getElementById("blackclock").classList.remove("running-clock"); + return; + } + } + + let white_clock_ms = null; + let black_clock_ms = null; + + // Static clocks. + if (data['position'] && + data['position']['white_clock'] && + data['position']['black_clock']) { + white_clock_ms = data['position']['white_clock'] * 1000; + black_clock_ms = data['position']['black_clock'] * 1000; + } + + // Dynamic clock (only one, obviously). + let color; + if (data['position']['white_clock_target']) { + color = "white"; + document.getElementById("whiteclock").classList.add("running-clock"); + document.getElementById("blackclock").classList.remove("running-clock"); + } else if (data['position']['black_clock_target']) { + color = "black"; + document.getElementById("whiteclock").classList.remove("running-clock"); + document.getElementById("blackclock").classList.add("running-clock"); + } else { + document.getElementById("whiteclock").classList.remove("running-clock"); + document.getElementById("blackclock").classList.remove("running-clock"); + } + let remaining_ms; + if (color) { + let now = new Date().getTime() + client_clock_offset_ms; + remaining_ms = data['position'][color + '_clock_target'] * 1000 - now; + if (color === "white") { + white_clock_ms = remaining_ms; + } else { + black_clock_ms = remaining_ms; + } + } + + if (white_clock_ms === null || black_clock_ms === null) { + document.getElementById("whiteclock").replaceChildren(); + document.getElementById("blackclock").replaceChildren(); + return; + } + + // If either player has twenty minutes or less left, add the second counters. + // This matches what DGT clocks do. + let show_seconds = (white_clock_ms < 60 * 20 * 1000 || black_clock_ms < 60 * 20 * 1000); + + if (color && remaining_ms > 0) { + // See when the clock will change next, and update right after that. + let next_update_ms; + if (show_seconds) { + next_update_ms = remaining_ms % 1000 + 100; + } else { + next_update_ms = remaining_ms % 60000 + 100; + } + clock_timer = setTimeout(update_clock, next_update_ms); + } + + document.getElementById("whiteclock").textContent = format_clock(white_clock_ms, show_seconds); + document.getElementById("blackclock").textContent = format_clock(black_clock_ms, show_seconds); +} + +/** + * @param {number} remaining_ms + * @param {boolean} show_seconds + */ +function format_clock(remaining_ms, show_seconds) { + if (remaining_ms <= 0) { + if (show_seconds) { + return "00:00:00"; + } else { + return "00:00"; + } + } + + let remaining = Math.floor(remaining_ms / 1000); + let seconds = remaining % 60; + remaining = (remaining - seconds) / 60; + let minutes = remaining % 60; + remaining = (remaining - minutes) / 60; + let hours = remaining; + if (show_seconds) { + return format_2d(hours) + ":" + format_2d(minutes) + ":" + format_2d(seconds); + } else { + return format_2d(hours) + ":" + format_2d(minutes); + } +} + +/** + * @param {number} x + */ +function format_2d(x) { + if (x >= 10) { + return x; + } else { + return "0" + x; + } +} + +/** + * @param {string} move + * @param {number} move_num Move number of this move. + * @param {boolean} white_to_play Whether white is to play this move. + */ +function format_move_with_number(move, move_num, white_to_play) { + let ret; + if (white_to_play) { + ret = move_num + '. '; + } else { + ret = move_num + '… '; + } + ret += move; + return ret; +} + +/** + * @param {string} move + * @param {number} halfmove_num Half-move number that is to be played, + * starting from 0. + */ +function format_halfmove_with_number(move, halfmove_num) { + return format_move_with_number( + move, + Math.floor(halfmove_num / 2) + 1, + halfmove_num % 2 == 0); +} + +/** + * @param {Object} data + * @param {number} halfmove_num + */ +function format_tooltip(data, halfmove_num) { + if (data['score_history'][halfmove_num + 1] || + (halfmove_num + 1) === data['position']['history'].length) { + // Position is in the history, or it is the current position + // (which is implicitly tacked onto the history). + let move; + let short_score; + if ((halfmove_num + 1) === data['position']['history'].length) { + move = data['position']['last_move']; + short_score = format_short_score(data['score']); + } else { + move = data['position']['history'][halfmove_num]; + short_score = format_short_score(data['score_history'][halfmove_num + 1]); + } + if (halfmove_num === -1) { + return "Start position: " + short_score; + } else { + let move_with_number = format_halfmove_with_number(move, halfmove_num); + return "After " + move_with_number + ": " + short_score; + } + } else { + for (let i = halfmove_num; i --> -1; ) { + if (data['score_history'][i]) { + let move = data['position']['history'][i]; + if (i === -1) { + return "[Analysis kept from start position]"; + } else { + return "[Analysis kept from " + format_halfmove_with_number(move, i) + "]"; + } + } + } + } } -window['resort_refutation_lines'] = resort_refutation_lines; /** * @param {number} line_num * @param {number} move_num */ -var show_line = function(line_num, move_num) { +function show_line(line_num, move_num) { if (line_num == -1) { current_display_line = null; current_display_move = null; + hash_refutation_lines = null; + if (displayed_analysis_data) { + // TODO: Support exiting to history position if we are in an + // analysis line of a history position. + displayed_analysis_data = null; + } + update_board(); + return; } else { - current_display_line = display_lines[line_num]; + current_display_line = {...display_lines[line_num]}; // Shallow clone. current_display_move = move_num; } + current_display_line_is_history = (line_num == 0); + + update_historic_analysis(); update_displayed_line(); - update_highlight(); + update_board_highlight(); + update_move_highlight(); redraw_arrows(); } window['show_line'] = show_line; -var prev_move = function() { - if (current_display_move > -1) { +function prev_move() { + if (current_display_line && + current_display_move >= current_display_line.start_display_move_num) { --current_display_move; } + update_historic_analysis(); update_displayed_line(); + update_move_highlight(); } window['prev_move'] = prev_move; -var next_move = function() { - if (current_display_line && current_display_move < current_display_line.pretty_pv.length - 1) { +function next_move() { + if (current_display_line && + current_display_move < current_display_line.pv.length - 1) { ++current_display_move; } + update_historic_analysis(); update_displayed_line(); + update_move_highlight(); } window['next_move'] = next_move; -var update_displayed_line = function() { +function next_game() { + if (current_games === null) { + return; + } + + // Try to find the game we are currently looking at. + for (let game_num = 0; game_num < current_games.length; ++game_num) { + let game = current_games[game_num]; + if (game['url'] === backend_url) { + let next_game_num = (game_num + 1) % current_games.length; + switch_backend(current_games[next_game_num]); + return; + } + } + + // Couldn't find it; give up. +} + +function update_historic_analysis() { + if (!current_display_line_is_history) { + return; + } + if (current_display_move == current_display_line.pv.length - 1) { + displayed_analysis_data = null; + update_board(); + } + + // Fetch old analysis for this line if it exists. + let hiddenboard = chess_from(current_display_line.start_fen, current_display_line.pv, current_display_move); + let filename = "/history/move" + (current_display_move + 1) + "-" + + hiddenboard.fen().replace(/ /g, '_').replace(/\//g, '-') + ".json"; + + let handle_err = () => { + displayed_analysis_data = {'failed': true}; + update_board(); + }; + + current_historic_xhr = new AbortController(); + const signal = current_analysis_xhr.signal; + fetch(filename, { signal }) + .then((response) => response.json().then(data => ({ok: response.ok, json: data}))) // ick + .then((obj) => { + if (!obj.ok) { + handle_err(); + return; + } + displayed_analysis_data = obj.json; + update_board(); + }) + .catch((err) => { + if (err.name === 'AbortError') { + // Aborted because we are switching backends. Abandon and don't retry, + // because another one is already started for us. + } else { + console.log(err); + handle_err(); + } + }); +} + +/** + * @param {string} fen + */ +function update_imbalance(fen) { + let imbalance = {'k': 0, 'q': 0, 'r': 0, 'b': 0, 'n': 0, 'p': 0}; + for (const c of fen) { + if (c === ' ') { + // End of board + break; + } + if (c != c.toUpperCase()) { + --imbalance[c]; + } else if (c != c.toLowerCase()) { + ++imbalance[c.toLowerCase()]; + } + } + + let white_imbalance = document.getElementById('whiteimbalance'); + let black_imbalance = document.getElementById('blackimbalance'); + white_imbalance.textContent = ''; + black_imbalance.textContent = ''; + for (let piece in imbalance) { + for (let i = 0; i < imbalance[piece]; ++i) { + let i1 = document.createElement('img'); + i1.src = svg_pieces['w' + piece.toUpperCase()]; + i1.setAttribute('alt', piece.toUpperCase()); + i1.classList.add('imbalance-piece'); + white_imbalance.appendChild(i1); + + let i2 = document.createElement('img'); + i2.src = svg_pieces['b' + piece.toUpperCase()]; + i2.setAttribute('alt', piece.toUpperCase()); + i2.classList.add('imbalance-inverted-piece'); + white_imbalance.appendChild(i2); + } + for (let i = 0; i < -imbalance[piece]; ++i) { + let i1 = document.createElement('img'); + i1.src = svg_pieces['b' + piece.toUpperCase()]; + i1.setAttribute('alt', piece.toUpperCase()); + i1.classList.add('imbalance-piece'); + black_imbalance.appendChild(i1); + + let i2 = document.createElement('img'); + i2.src = svg_pieces['w' + piece.toUpperCase()]; + i2.setAttribute('alt', piece.toUpperCase()); + i2.classList.add('imbalance-inverted-piece'); + black_imbalance.appendChild(i2); + } + } +} + +/** Mark the currently selected move in red. + * Also replaces the PV with the current displayed line if it's not shown + * anywhere else on the screen. + */ +function update_move_highlight() { + if (highlighted_move !== null) { + highlighted_move.classList.remove('highlight'); + } + if (current_display_line) { + let display_line_num = find_display_line_matching_num(); + if (display_line_num === null) { + // Replace the PV with the (complete) line. + document.getElementById("pvtitle").textContent = "Exploring:"; + current_display_line.start_display_move_num = 0; + display_lines.push(current_display_line); + document.getElementById("pv").replaceChildren(print_pv(display_lines.length - 1, null)); // FIXME + display_line_num = display_lines.length - 1; + + // Clear out the PV, so it's not selected by anything later. + display_lines[1].pv = []; + } + + highlighted_move = document.getElementById("automove" + display_line_num + "-" + current_display_move); + if (highlighted_move !== null) { + highlighted_move.classList.add('highlight'); + } + } +} + +/** + * See if the current displayed line is identical to any of the ones + * we have on screen. (It might not be if e.g. the analysis reloaded + * since we started looking.) + * + * @return {?number} + */ +function find_display_line_matching_num() { + for (let i = 0; i < display_lines.length; ++i) { + let line = display_lines[i]; + if (line.start_display_move_num > 0) continue; + if (current_display_line.start_fen !== line.start_fen) continue; + if (current_display_line.pv.length !== line.pv.length) continue; + let ok = true; + for (let j = 0; j < line.pv.length; ++j) { + if (current_display_line.pv[j] !== line.pv[j]) { + ok = false; + break; + } + } + if (ok) { + return i; + } + } + return null; +} + +/** Update the board based on the currently displayed line. + * + * TODO: This should really be called only whenever something changes, + * instead of all the time. + */ +function update_displayed_line() { if (current_display_line === null) { - $("#linenav").hide(); - $("#linemsg").show(); - board.position(fen); + document.getElementById("linenav").style.display = 'none'; + document.getElementById("linemsg").style.display = 'revert'; + display_fen = base_fen; + set_board_position(base_fen); + update_imbalance(base_fen); return; } - $("#linenav").show(); - $("#linemsg").hide(); + document.getElementById("linenav").style.display = 'revert'; + document.getElementById("linemsg").style.display = 'none'; - if (current_display_move == 0) { - $("#prevmove").html("Previous"); + if (current_display_move <= 0) { + document.getElementById("prevmove").textContent = "Previous"; } else { - $("#prevmove").html("<a href=\"javascript:prev_move();\">Previous</a></span>"); + document.getElementById("prevmove").innerHTML = "<a href=\"javascript:prev_move();\">Previous</a></span>"; } - if (current_display_move == current_display_line.uci_pv.length - 1) { - $("#nextmove").html("Next"); + if (current_display_move == current_display_line.pv.length - 1) { + document.getElementById("nextmove").textContent = "Next"; } else { - $("#nextmove").html("<a href=\"javascript:next_move();\">Next</a></span>"); + document.getElementById("nextmove").innerHTML = "<a href=\"javascript:next_move();\">Next</a></span>"; + } + + let hiddenboard = chess_from(current_display_line.start_fen, current_display_line.pv, current_display_move); + set_board_position(hiddenboard.fen()); + if (display_fen !== hiddenboard.fen() && !current_display_line_is_history) { + // Fire off a hash request, since we're now off the main position + // and it just changed. + explore_hash(hiddenboard.fen()); + } + display_fen = hiddenboard.fen(); + update_imbalance(hiddenboard.fen()); +} + +function set_board_position(new_fen) { + board_is_animating = true; + let old_fen = board.fen(); + let animate = old_fen !== '8/8/8/8/8/8/8/'; + board.position(new_fen, animate); + if (board.fen() === old_fen) { + board_is_animating = false; + } +} + +/** + * @param {boolean} param_enable_sound + */ +function set_sound(param_enable_sound) { + enable_sound = param_enable_sound; + if (enable_sound) { + document.getElementById("soundon").innerHTML = "<strong>On</strong>"; + document.getElementById("soundoff").innerHTML = "<a href=\"javascript:set_sound(false)\">Off</a>"; + + // Seemingly at least Firefox prefers MP3 over Opus; tell it otherwise, + // and also preload the file since the user has selected audio. + let ding = document.getElementById('ding'); + if (ding && ding.canPlayType && ding.canPlayType('audio/ogg; codecs="opus"') === 'probably') { + ding.src = 'ding.opus'; + ding.load(); + } + } else { + document.getElementById("soundon").innerHTML = "<a href=\"javascript:set_sound(true)\">On</a>"; + document.getElementById("soundoff").innerHTML = "<strong>Off</strong>"; + } + if (supports_html5_storage()) { + window['localStorage']['enable_sound'] = enable_sound ? 1 : 0; + } +} +window['set_sound'] = set_sound; + +/** Send off a hash probe request to the backend. + * @param {string} fen + */ +function explore_hash(fen) { + // If we already have a backend response going, abort it. + if (current_hash_xhr) { + current_hash_xhr.abort(); + } + if (current_hash_display_timer) { + clearTimeout(current_hash_display_timer); + current_hash_display_timer = null; + } + document.getElementById("refutationlines").replaceChildren(); + + current_hash_xhr = new AbortController(); + const signal = current_analysis_xhr.signal; + fetch(backend_hash_url + "?fen=" + fen, { signal }) + .then((response) => response.json()) + .then((data) => { show_explore_hash_results(data, fen); }) + .catch((err) => { + // Truncate the lines, since we already cleared the display. + display_lines = [ display_lines[0], display_lines[1] ]; + update_move_highlight(); + }); +} + +/** Process the JSON response from a hash probe request. + * @param {!Object} data + * @param {string} fen + */ +function show_explore_hash_results(data, fen) { + if (board_is_animating) { + // Updating while the animation is still going causes + // the animation to jerk. This is pretty crude, but it will do. + current_hash_display_timer = setTimeout(function() { show_explore_hash_results(data, fen); }, 100); + return; + } + current_hash_display_timer = null; + hash_refutation_lines = data['lines']; + hash_refutation_lines_base_fen = fen; + update_board(); +} + +// almost all of this stuff comes from the chessboard.js example page +function onDragStart(source, piece, position, orientation) { + let pseudogame = new Chess(display_fen); + if (pseudogame.game_over() === true || + (pseudogame.turn() === 'w' && piece.search(/^b/) !== -1) || + (pseudogame.turn() === 'b' && piece.search(/^w/) !== -1)) { + return false; + } + + recommended_move = get_best_move(pseudogame, source, null, pseudogame.turn() === 'b'); + if (recommended_move) { + let squareEl = document.querySelector('#board .square-' + recommended_move.to); + squareEl.classList.add('highlight1-32417'); } + return true; +} + +function mousedownSquare(e) { + if (!e.target || !e.target.getAttribute('data-square')) { + return; + } + + reverse_dragging_from = null; + let square = e.target.getAttribute('data-square'); - hiddenboard.position(current_display_line.start_fen, false); - for (var i = 0; i <= current_display_move; ++i) { - var move = current_display_line.uci_pv[i]; - move = move.substr(0, 2) + "-" + move.substr(2, 4); - hiddenboard.move(move, false); + let pseudogame = new Chess(display_fen); + if (pseudogame.game_over() === true) { + return; + } - // chessboard.js does not automatically move the rook on castling - // (issue #51; marked as won't fix), so update it ourselves. - if (move == "e1-g1" && hiddenboard.position().g1 == "wK") { // white O-O - hiddenboard.move("h1-f1", false); - } else if (move == "e1-c1" && hiddenboard.position().c1 == "wK") { // white O-O-O - hiddenboard.move("a1-d1", false); - } else if (move == "e8-g8" && hiddenboard.position().g8 == "bK") { // black O-O - hiddenboard.move("h8-f8", false); - } else if (move == "e8-c8" && hiddenboard.position().c8 == "bK") { // black O-O-O - hiddenboard.move("a8-d8", false); + // If the square is empty, or has a piece of the side not to move, + // we handle it. If not, normal piece dragging will take it. + let position = board.position(); + if (!position.hasOwnProperty(square) || + (pseudogame.turn() === 'w' && position[square].search(/^b/) !== -1) || + (pseudogame.turn() === 'b' && position[square].search(/^w/) !== -1)) { + reverse_dragging_from = square; + recommended_move = get_best_move(pseudogame, null, square, pseudogame.turn() === 'b'); + if (recommended_move) { + let squareEl = document.querySelector('#board .square-' + recommended_move.from); + squareEl.classList.add('highlight1-32417'); + squareEl = document.querySelector('#board .square-' + recommended_move.to); + squareEl.classList.add('highlight1-32417'); } } - board.position(hiddenboard.position()); } -var init = function() { +function mouseupSquare(e) { + if (!e.target || !e.target.getAttribute('data-square')) { + return; + } + if (reverse_dragging_from === null) { + return; + } + let source = e.target.getAttribute('data-square'); + let target = reverse_dragging_from; + reverse_dragging_from = null; + if (onDrop(source, target) !== 'snapback') { + onSnapEnd(source, target); + } + document.getElementById("board").querySelectorAll('.square-55d63.highlight1-32417').forEach((square) => { + square.classList.remove('highlight1-32417'); + }); +} + +function get_best_move(game, source, target, invert) { + let moves = game.moves({ verbose: true }); + if (source !== null) { + moves = moves.filter(function(move) { return move.from == source; }); + } + if (target !== null) { + moves = moves.filter(function(move) { return move.to == target; }); + } + if (moves.length == 0) { + return null; + } + if (moves.length == 1) { + return moves[0]; + } + + // More than one move. Use the display lines (if we have them) + // to disambiguate; otherwise, we have no information. + let move_hash = {}; + for (let i = 0; i < moves.length; ++i) { + move_hash[moves[i].san] = moves[i]; + } + + // See if we're already exploring some line. + if (current_display_line && + current_display_move < current_display_line.pv.length - 1) { + let first_move = current_display_line.pv[current_display_move + 1]; + if (move_hash[first_move]) { + return move_hash[first_move]; + } + } + + // History and PV take priority over the display lines. + for (let i = 0; i < 2; ++i) { + let line = display_lines[i]; + let first_move = line.pv[line.start_display_move_num]; + if (move_hash[first_move]) { + return move_hash[first_move]; + } + } + + let best_move = null; + let best_move_score = null; + + let refutation_lines = choose_displayed_refutation_lines()[0]; + for (let move in refutation_lines) { + let line = refutation_lines[move]; + if (!line['score']) { + continue; + } + let first_move = line['pv'][0]; + if (move_hash[first_move]) { + let score = compute_score_sort_key(line['score'], line['depth'], invert); + if (best_move_score === null || score > best_move_score) { + best_move = move_hash[first_move]; + best_move_score = score; + } + } + } + return best_move; +} + +function onDrop(source, target) { + if (source === target) { + if (recommended_move === null) { + return 'snapback'; + } else { + // Accept the move. It will be changed in onSnapEnd. + return; + } + } else { + // Suggestion not asked for. + recommended_move = null; + } + + // see if the move is legal + let pseudogame = new Chess(display_fen); + let move = pseudogame.move({ + from: source, + to: target, + promotion: 'q' // NOTE: always promote to a queen for example simplicity + }); + + // illegal move + if (move === null) return 'snapback'; +} + +/** + * If we are in admin mode, send this move to the backend. + * + * @param {string} fen + * @param {string} move + */ +function send_chosen_move(fen, move) { + if (admin_password !== null) { + let history = current_analysis_data['position']['history']; + let url = '/manual-override.pl'; + url += '?fen=' + encodeURIComponent(fen); + url += '&history=' + encodeURIComponent(JSON.stringify(history)); + url += '&move=' + encodeURIComponent(move); + url += '&player_w=' + encodeURIComponent(current_analysis_data['position']['player_w']); + url += '&player_b=' + encodeURIComponent(current_analysis_data['position']['player_b']); + url += '&password=' + encodeURIComponent(admin_password); + + console.log(fen, history); + fetch(url); // Ignore the result. + } +} + +function undo_move() { + if (admin_password !== null) { + let history = current_analysis_data['position']['history']; + history = history.slice(0, history.length - 1); + + let position = current_analysis_data['position']['start_fen']; + let hiddenboard = chess_from(position, history, history.length); + let fen = hiddenboard.fen(); + + let url = '/manual-override.pl'; + url += '?fen=' + encodeURIComponent(fen); + url += '&history=' + encodeURIComponent(JSON.stringify(history)); + url += '&move=null'; + url += '&player_w=' + encodeURIComponent(current_analysis_data['position']['player_w']); + url += '&player_b=' + encodeURIComponent(current_analysis_data['position']['player_b']); + url += '&password=' + encodeURIComponent(admin_password); + + console.log(fen, history); + fetch(url); // Ignore the result. + } +} +window['undo_move'] = undo_move; + +function onSnapEnd(source, target) { + if (source === target && recommended_move !== null) { + source = recommended_move.from; + target = recommended_move.to; + } + recommended_move = null; + let pseudogame = new Chess(display_fen); + let move = pseudogame.move({ + from: source, + to: target, + promotion: 'q' // NOTE: always promote to a queen for example simplicity + }); + + if (admin_password !== null) { + send_chosen_move(display_fen, move.san); + return; + } + + // Move ahead on the line we're on -- this includes history if we've + // gone backwards. + if (current_display_line && + current_display_move < current_display_line.pv.length - 1 && + current_display_line.pv[current_display_move + 1] === move.san) { + next_move(); + return; + } + + // Walk down the displayed lines until we find one that starts with + // this move, then select that. Note that this gives us a good priority + // order (PV, then multi-PV lines; history was already dealt with above, + // as it's the only line that originates backwards). + for (let i = 1; i < display_lines.length; ++i) { + if (i == 1 && current_display_line) { + // Do not choose PV if not on it. + continue; + } + let line = display_lines[i]; + if (line.pv[line.start_display_move_num] === move.san) { + show_line(i, line.start_display_move_num); + return; + } + } + + // Shouldn't really be here if we have hash probes, but there's really + // nothing we can do. + // FIXME: Just make a new line, probably (even if we don't have hash moves). + // As it is, we can actually drag (but not click) such a move in the UI, + // but it has no effect on what we're probing. +} +// End of dragging-related code. + +function fmt_cp(v) { + if (v === 0) { + return "0.00"; + } else if (v > 0) { + return "+" + (v / 100).toFixed(2); + } else { + v = -v; + return "-" + (v / 100).toFixed(2); + } +} + +function format_short_score(score) { + if (!score) { + return "???"; + } + if (score[0] === 'T' || score[0] === 't') { + let ret = "TB\u00a0"; + if (score[2]) { // Is a bound. + ret = score[2] + "\u00a0TB\u00a0"; + } + if (score[0] === 'T') { + return ret + Math.ceil(score[1] / 2); + } else { + return ret + "-" + Math.ceil(score[1] / 2); + } + } else if (score[0] === 'M' || score[0] === 'm') { + let sign = (score[0] === 'm') ? '-' : ''; + if (score[2]) { // Is a bound. + return score[2] + "\u00a0M " + sign + score[1]; + } else { + return "M " + sign + score[1]; + } + } else if (score[0] === 'd') { + return "TB =0"; + } else if (score[0] === 'cp') { + if (score[2]) { // Is a bound. + return score[2] + "\u00a0" + fmt_cp(score[1]); + } else { + return fmt_cp(score[1]); + } + } + return null; +} + +function format_long_score(score) { + if (!score) { + return "???"; + } + if (score[0] === 'T') { + if (score[1] == 0) { + return "Won for white (tablebase)"; + } else { + return "White wins in " + Math.ceil(score[1] / 2); + } + } else if (score[0] === 't') { + if (score[1] == -1) { + return "Won for black (tablebase)"; + } else { + return "Black wins in " + Math.ceil(score[1] / 2); + } + } else if (score[0] === 'M') { + if (score[1] == 0) { + return "White wins by checkmate"; + } else { + return "White mates in " + score[1]; + } + } else if (score[0] === 'm') { + if (score[1] == 0) { + return "Black wins by checkmate"; + } else { + return "Black mates in " + score[1]; + } + } else if (score[0] === 'd') { + return "Theoretical draw"; + } else if (score[0] === 'cp') { + return "Score: " + format_short_score(score); + } + return null; +} + +function compute_plot_score(score) { + if (score[0] === 'M' || score[0] === 'T') { + return 500; + } else if (score[0] === 'm' || score[0] === 't') { + return -500; + } else if (score[0] === 'd') { + return 0; + } else if (score[0] === 'cp') { + if (score[1] > 500) { + return 500; + } else if (score[1] < -500) { + return -500; + } else { + return score[1]; + } + } + return null; +} + +/** + * @param score The score digest tuple. + * @param {?number} depth Depth the move has been computed to, or null. + * @param {boolean} invert Whether black is to play. + * @return {number} + */ +function compute_score_sort_key(score, depth, invert) { + let s; + if (!score) { + return -10000000; + } + if (score[0] === 'T') { + // White reaches TB win. + s = 89999 - score[1]; + } else if (score[0] === 't') { + // Black reaches TB win. + s = -(89999 - score[1]); + } else if (score[0] === 'M') { + // White mates. + s = 99999 - score[1]; + } else if (score[0] === 'm') { + // Black mates. + s = -(99999 - score[1]); + } else if (score[0] === 'd') { + s = 0; + } else if (score[0] === 'cp') { + s = score[1]; + } + if (s) { + if (invert) s = -s; + return s; + } else { + return null; + } +} + +/** + * @param {Object} game + */ +function switch_backend(game) { + // Stop looking at historic data. + current_display_line = null; + current_display_move = null; + displayed_analysis_data = null; + if (current_historic_xhr) { + current_historic_xhr.abort(); + } + + // If we already have a backend response going, abort it. + if (current_analysis_xhr) { + current_analysis_xhr.abort(); + } + if (current_hash_xhr) { + current_hash_xhr.abort(); + } + + // Otherwise, we should have a timer going to start a new one. + // Kill that, too. + if (current_analysis_request_timer) { + clearTimeout(current_analysis_request_timer); + current_analysis_request_timer = null; + } + if (current_hash_display_timer) { + clearTimeout(current_hash_display_timer); + current_hash_display_timer = null; + } + + // Request an immediate fetch with the new backend. + backend_url = game['url']; + backend_hash_url = game['hashurl']; + window.location.hash = '#' + game['id']; + current_analysis_data = null; + ims = 0; + request_update(); +} +window['switch_backend'] = switch_backend; + +window['flip'] = function() { board.flip(); redraw_arrows(); }; +window['set_delay_ms'] = function(ms) { delay_ms = ms; console.log('Delay is now ' + ms + ' ms.'); }; + +// Mostly from Wikipedia's chess set as of October 2022, but some pieces are from +// the 2013 version, as I like those better (and it matches the 2014 PNGs; nobody +// really likes change, do they?). That is wK, bK, bQ. wQ is also slightly different, +// but not enough to notice. +const svg_pieces = { + 'wK': 'data:image/svg+xml,<?xml version=%221.0%22 encoding=%22UTF-8%22 standalone=%22no%22?>%0A<!DOCTYPE svg PUBLIC %22-//W3C//DTD SVG 1.1//EN%22 %22http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd%22>%0A<svg xmlns=%22http://www.w3.org/2000/svg%22 version=%221.1%22 width=%2245%22 height=%2245%22><g style=%22fill:none;fill-opacity:1;fill-rule:evenodd;stroke:%23000000;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1%22><path d=%22M 22.5,11.63 L 22.5,6%22 style=%22fill:none;stroke:%23000000;stroke-linejoin:miter%22/><path d=%22M 20,8 L 25,8%22 style=%22fill:none;stroke:%23000000;stroke-linejoin:miter%22/><path d=%22M 22.5,25 C 22.5,25 27,17.5 25.5,14.5 C 25.5,14.5 24.5,12 22.5,12 C 20.5,12 19.5,14.5 19.5,14.5 C 18,17.5 22.5,25 22.5,25%22 style=%22fill:%23ffffff;stroke:%23000000;stroke-linecap:butt;stroke-linejoin:miter%22/><path d=%22M 11.5,37 C 17,40.5 27,40.5 32.5,37 L 32.5,30 C 32.5,30 41.5,25.5 38.5,19.5 C 34.5,13 25,16 22.5,23.5 L 22.5,27 L 22.5,23.5 C 19,16 9.5,13 6.5,19.5 C 3.5,25.5 11.5,29.5 11.5,29.5 L 11.5,37 z %22 style=%22fill:%23ffffff;stroke:%23000000%22/><path d=%22M 11.5,30 C 17,27 27,27 32.5,30%22 style=%22fill:none;stroke:%23000000%22/><path d=%22M 11.5,33.5 C 17,30.5 27,30.5 32.5,33.5%22 style=%22fill:none;stroke:%23000000%22/><path d=%22M 11.5,37 C 17,34 27,34 32.5,37%22 style=%22fill:none;stroke:%23000000%22/></g></svg>', + 'wQ': 'data:image/svg+xml,<?xml version=%221.0%22 encoding=%22UTF-8%22 standalone=%22no%22?>%0A<!DOCTYPE svg PUBLIC %22-//W3C//DTD SVG 1.1//EN%22 %22http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd%22>%0A<svg xmlns=%22http://www.w3.org/2000/svg%22 version=%221.1%22 width=%2245%22 height=%2245%22><g style=%22fill:%23ffffff;stroke:%23000000;stroke-width:1.5;stroke-linejoin:round%22><path d=%22M 9,26 C 17.5,24.5 30,24.5 36,26 L 38.5,13.5 L 31,25 L 30.7,10.9 L 25.5,24.5 L 22.5,10 L 19.5,24.5 L 14.3,10.9 L 14,25 L 6.5,13.5 L 9,26 z%22/><path d=%22M 9,26 C 9,28 10.5,28 11.5,30 C 12.5,31.5 12.5,31 12,33.5 C 10.5,34.5 11,36 11,36 C 9.5,37.5 11,38.5 11,38.5 C 17.5,39.5 27.5,39.5 34,38.5 C 34,38.5 35.5,37.5 34,36 C 34,36 34.5,34.5 33,33.5 C 32.5,31 32.5,31.5 33.5,30 C 34.5,28 36,28 36,26 C 27.5,24.5 17.5,24.5 9,26 z%22/><path d=%22M 11.5,30 C 15,29 30,29 33.5,30%22 style=%22fill:none%22/><path d=%22M 12,33.5 C 18,32.5 27,32.5 33,33.5%22 style=%22fill:none%22/><circle cx=%226%22 cy=%2212%22 r=%222%22/><circle cx=%2214%22 cy=%229%22 r=%222%22/><circle cx=%2222.5%22 cy=%228%22 r=%222%22/><circle cx=%2231%22 cy=%229%22 r=%222%22/><circle cx=%2239%22 cy=%2212%22 r=%222%22/></g></svg>', + 'wR': 'data:image/svg+xml,<?xml version=%221.0%22 encoding=%22UTF-8%22 standalone=%22no%22?>%0A<!DOCTYPE svg PUBLIC %22-//W3C//DTD SVG 1.1//EN%22 %22http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd%22>%0A<svg xmlns=%22http://www.w3.org/2000/svg%22 version=%221.1%22 width=%2245%22 height=%2245%22><g style=%22opacity:1;fill:%23ffffff;fill-opacity:1;fill-rule:evenodd;stroke:%23000000;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1%22 transform=%22translate(0,0.3)%22><path d=%22M 9,39 L 36,39 L 36,36 L 9,36 L 9,39 z %22 style=%22stroke-linecap:butt%22/><path d=%22M 12,36 L 12,32 L 33,32 L 33,36 L 12,36 z %22 style=%22stroke-linecap:butt%22/><path d=%22M 11,14 L 11,9 L 15,9 L 15,11 L 20,11 L 20,9 L 25,9 L 25,11 L 30,11 L 30,9 L 34,9 L 34,14%22 style=%22stroke-linecap:butt%22/><path d=%22M 34,14 L 31,17 L 14,17 L 11,14%22/><path d=%22M 31,17 L 31,29.5 L 14,29.5 L 14,17%22 style=%22stroke-linecap:butt;stroke-linejoin:miter%22/><path d=%22M 31,29.5 L 32.5,32 L 12.5,32 L 14,29.5%22/><path d=%22M 11,14 L 34,14%22 style=%22fill:none;stroke:%23000000;stroke-linejoin:miter%22/></g></svg>', + 'wB': 'data:image/svg+xml,<?xml version=%221.0%22 encoding=%22UTF-8%22 standalone=%22no%22?>%0A<!DOCTYPE svg PUBLIC %22-//W3C//DTD SVG 1.1//EN%22 %22http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd%22>%0A<svg xmlns=%22http://www.w3.org/2000/svg%22 version=%221.1%22 width=%2245%22 height=%2245%22><g style=%22opacity:1;fill:none;fill-rule:evenodd;fill-opacity:1;stroke:%23000000;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1%22 transform=%22translate(0,0.6)%22><g style=%22fill:%23ffffff;stroke:%23000000;stroke-linecap:butt%22><path d=%22M 9,36 C 12.39,35.03 19.11,36.43 22.5,34 C 25.89,36.43 32.61,35.03 36,36 C 36,36 37.65,36.54 39,38 C 38.32,38.97 37.35,38.99 36,38.5 C 32.61,37.53 25.89,38.96 22.5,37.5 C 19.11,38.96 12.39,37.53 9,38.5 C 7.65,38.99 6.68,38.97 6,38 C 7.35,36.54 9,36 9,36 z%22/><path d=%22M 15,32 C 17.5,34.5 27.5,34.5 30,32 C 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23,18%22 style=%22fill:%23ffffff;stroke:%23000000%22/><path d=%22M 24,18 C 24.38,20.91 18.45,25.37 16,27 C 13,29 13.18,31.34 11,31 C 9.958,30.06 12.41,27.96 11,28 C 10,28 11.19,29.23 10,30 C 9,30 5.997,31 6,26 C 6,24 12,14 12,14 C 12,14 13.89,12.1 14,10.5 C 13.27,9.506 13.5,8.5 13.5,7.5 C 14.5,6.5 16.5,10 16.5,10 L 18.5,10 C 18.5,10 19.28,8.008 21,7 C 22,7 22,10 22,10%22 style=%22fill:%23ffffff;stroke:%23000000%22/><path d=%22M 9.5 25.5 A 0.5 0.5 0 1 1 8.5,25.5 A 0.5 0.5 0 1 1 9.5 25.5 z%22 style=%22fill:%23000000;stroke:%23000000%22/><path d=%22M 15 15.5 A 0.5 1.5 0 1 1 14,15.5 A 0.5 1.5 0 1 1 15 15.5 z%22 transform=%22matrix(0.866,0.5,-0.5,0.866,9.693,-5.173)%22 style=%22fill:%23000000;stroke:%23000000%22/></g></svg>', + 'wP': 'data:image/svg+xml,<?xml version=%221.0%22 encoding=%22UTF-8%22 standalone=%22no%22?>%0A<!DOCTYPE svg PUBLIC %22-//W3C//DTD SVG 1.1//EN%22 %22http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd%22>%0A<svg xmlns=%22http://www.w3.org/2000/svg%22 version=%221.1%22 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admin_password = admin_match[1]; + } + // Create board. - board = new window.ChessBoard('board', 'start'); - hiddenboard = new window.ChessBoard('hiddenboard', 'start'); + board = new window.ChessBoard('board', { + onMoveEnd: function() { board_is_animating = false; }, + + draggable: true, + pieceTheme: svg_piece_theme, + onDragStart: onDragStart, + onDrop: onDrop, + onSnapEnd: onSnapEnd + }); + document.getElementById("board").addEventListener('mousedown', mousedownSquare); + document.getElementById("board").addEventListener('mouseup', mouseupSquare); + if (window['inline_json']) { + let j = window['inline_json']; + process_update_response(j['data'], { 'get': (h) => j['headers'][h] }); + delete window['inline_json']; + } request_update(); - $(window).resize(function() { + window.addEventListener('resize', function() { board.resize(); - update_highlight(); + update_sparkline(displayed_analysis_data || current_analysis_data); + update_board_highlight(); redraw_arrows(); }); - $(window).keyup(function(event) { - if (event.which == 39) { + new ResizeObserver(() => update_sparkline(displayed_analysis_data || current_analysis_data)).observe(document.getElementById('scoresparkcontainer')); + window.addEventListener('keyup', function(event) { + if (event.which == 39) { // Left arrow. next_move(); - } else if (event.which == 37) { + } else if (event.which == 37) { // Right arrow. prev_move(); + } else if (event.which >= 49 && event.which <= 57) { // 1-9. + let num = event.which - 49; + if (current_games && current_games.length >= num) { + switch_backend(current_games[num]); + } + } else if (event.which == 78) { // N. + next_game(); } }); + window.addEventListener('hashchange', possibly_switch_game_from_hash, false); + possibly_switch_game_from_hash(); }; -$(document).ready(init); +document.addEventListener('DOMContentLoaded', init); })();