+var grpc = require('grpc');
+var Chess = require(__dirname + '/chess.min.js').Chess;
+
+var PROTO_PATH = __dirname + '/hashprobe.proto';
+var hashprobe_proto = grpc.load(PROTO_PATH).hashprobe;
+
+// TODO: Make destination configurable.
+var client = new hashprobe_proto.HashProbe('localhost:50051', grpc.credentials.createInsecure());
+
+var handle_request = function(fen, response) {
+ client.probe({fen: fen}, function(err, probe_response) {
+ if (err) {
+ response.writeHead(500, {});
+ response.end();
+ } else {
+ handle_response(fen, response, probe_response);
+ }
+ });
+}
+exports.handle_request = handle_request;
+
+var handle_response = function(fen, response, probe_response) {
+ var board = new Chess();
+
+ var lines = {};
+
+ var root = translate_line(board, fen, probe_response['root'], true);
+ for (var i = 0; i < probe_response['line'].length; ++i) {
+ var line = probe_response['line'][i];
+ var uci_move = line['move']['from_sq'] + line['move']['to_sq'] + line['move']['promotion'];
+ lines[uci_move] = translate_line(board, fen, line, false);
+ }
+
+ var text = JSON.stringify({
+ root: root,
+ lines: lines
+ });
+ var headers = {
+ 'Content-Type': 'text/json; charset=utf-8'
+ //'Content-Length': text.length
+ };
+ response.writeHead(200, headers);
+ response.write(text);
+ response.end();
+}
+
+var translate_line = function(board, fen, line, pretty_score) {
+ var r = {};
+ board.load(fen);
+ var toplay = board.turn();
+
+ if (line['move'] && line['move']['from_sq']) {
+ r['pretty_move'] = board.move({ from: line['move']['from_sq'], to: line['move']['to_sq'], promotion: line['move']['promotion'] }).san;
+ } else {
+ r['pretty_move'] = '';
+ }
+ r['sort_key'] = r['pretty_move'];
+ if (!line['found']) {
+ r['pv_pretty'] = [];
+ r['score_sort_key'] = -100000000;
+ return r;
+ }
+ r['depth'] = line['depth'];
+
+ // Convert the PV.
+ var pv = [];
+ if (r['pretty_move']) {
+ pv.push(r['pretty_move']);
+ }
+ for (var j = 0; j < line['pv'].length; ++j) {
+ var move = line['pv'][j];
+ var decoded = board.move({ from: move['from_sq'], to: move['to_sq'], promotion: move['promotion'] });
+ if (decoded === null) {
+ break;
+ }
+ pv.push(decoded.san);
+ }
+ r['pv_pretty'] = pv;
+
+ // Write out the pretty score.
+ // TODO: mates!
+ var score = pretty_score ? 'Score: ' : '';
+
+ if (line['bound'] === 'BOUND_UPPER') {
+ score += '≤\u00a0';
+ } else if (line['bound'] === 'BOUND_LOWER') {
+ score += '≥\u00a0';
+ }
+
+ var value = line['value']['score_cp'];
+ if (value > 0) {
+ score += '+' + (value / 100.0).toFixed(2);
+ } else if (value < 0) {
+ score += (value / 100.0).toFixed(2);
+ } else if (value == 0) {
+ score += '0.00';
+ } else {
+ score += '';
+ }
+ r['pretty_score'] = score;
+ r['score_sort_key'] = score_sort_key(line['value'], toplay === 'b') * 200 + r['depth'];
+
+ return r;
+}
+
+var score_sort_key = function(score, invert) {
+ if (score['score_type'] === 'SCORE_MATE') {
+ var mate = score['score_mate'];
+ var score;
+ if (mate > 0) {
+ // Side to move mates
+ score = 99999 - mate;
+ } else {
+ // Side to move is getting mated (note the double negative for mate)
+ score = -99999 - mate;
+ }
+ if (invert) {
+ score = -score;
+ }
+ return score;
+ } else if (score['score_type'] === 'SCORE_CP') {
+ var score = score['score_cp'];
+ if (invert) {
+ score = -score;
+ }
+ return score;
+ }
+
+ return null;
+}