Added refactoring comment

[ccbs] / bigscreen / groupscreen.cpp

#include <cstdio>
#include <algorithm>
#include <map>

#include "resolution.h"
#include "groupscreen.h"
#include "fetch_group.h"
#include "fetch_max_score_for_songs.h"
#include "fetch_max_score_for_players.h"
#include "fetch_needs_update.h"
#include "fetch_highscore.h"
#include "fonts.h"

GroupScreen::GroupScreen(pqxx::connection &conn, unsigned tournament, unsigned round, unsigned parallel, unsigned machine, unsigned num_machines, unsigned players_per_machine)
        : tournament(tournament), round(round), parallel(parallel), machine(machine), num_machines(num_machines), players_per_machine(players_per_machine), scores_changed(conn, "scores"), conn(conn), valid(false)
{
}

GroupScreen::~GroupScreen()
{
}

bool GroupScreen::check_invalidated()
{
        if (!valid)
                return true;
        if (!scores_changed.get_flag())
                return false;

        bool needs_update;
        conn.perform(FetchNeedsUpdate(last_updated, tournament, round, parallel, &needs_update));

        if (!needs_update)
                scores_changed.reset_flag();
        
        return needs_update;
}

unsigned GroupScreen::get_show_players(const Group &group)
{
        unsigned num_players_this_machine = (group.players.size() + num_machines - machine - 1) / num_machines;
        return std::min(num_players_this_machine, 9U);
}

void GroupScreen::draw_main_heading(std::vector<TextDefer> &td)
{
        char heading[64];
        if (num_machines == 1) {
                if (parallel == 0) {
                        std::sprintf(heading, "Round %u", round);
                } else {
                        std::sprintf(heading, "Round %u, Group %u", round, parallel);
                }
        } else {
                if (parallel == 0) {
                        std::sprintf(heading, "Round %u, Machine %u", round, machine + 1);
                } else {
                        std::sprintf(heading, "Round %u, Group %u, Machine %u", round, parallel, machine + 1);
                }
        }

        unsigned width = my_draw_text(heading, NULL, 40.0);
        my_draw_text_deferred(td, heading, 40.0, LOGICAL_SCREEN_WIDTH/2 - width/2, 60);
}

// make column headings from the first player's songs
void GroupScreen::draw_column_headings(std::vector<TextDefer> &td, const Group &group, const std::vector<unsigned> &colwidth)
{
        unsigned num_scores = group.players[0].scores.size();

        unsigned col = 1;
        unsigned x = 40 + colwidth[0];
        for (std::vector<Score>::const_iterator i = group.players[0].scores.begin(); i != group.players[0].scores.end(); ++i, ++col) {
                if (!i->chosen) {
                        unsigned this_width = my_draw_text(i->song.short_title, NULL, 12.0);
                        my_draw_text_deferred(td, i->song.short_title, 12.0, x + colwidth[col] / 2 - this_width / 2, 100);
                }
                x += colwidth[col] + 20;
        }

        my_draw_text_deferred(td, "Total", 12.0, x + colwidth[num_scores + 1] / 2 - my_draw_text("Total", NULL, 12.0) / 2, 100);
        x += colwidth[num_scores + 1] + 20;
        my_draw_text_deferred(td, "Rank", 12.0, x + colwidth[num_scores + 2] / 2 - my_draw_text("Rank", NULL, 12.0) / 2, 100);
}       
        
// show all the players and the scores
void GroupScreen::draw_scores(std::vector<TextDefer> &td, const Group &group, const std::vector<unsigned> &colwidth)
{
        unsigned max_num_width = my_draw_text("8888", NULL, 22.0);
        unsigned num_scores = group.players[0].scores.size();
        unsigned show_players = get_show_players(group);
        unsigned y = (show_players <= 7) ? 140 : (140 - (show_players - 7) * 5);
        
        unsigned row = 0, m = 0, x;
        for (std::vector<Player>::const_iterator i = group.players.begin(); i != group.players.end() && row < 9; ++i) {
                if (m++ % num_machines != machine)
                        continue;

                my_draw_text_deferred(td, i->nick, 18.0, 20, y);

                x = 40 + colwidth[0];

                unsigned col = 1;
                for (std::vector<Score>::const_iterator j = i->scores.begin(); j != i->scores.end(); ++j, ++col) {
                        char text[16] = "";
                        if (j->score != -1) {
                                std::sprintf(text, "%u", j->score);
                        }
        
                        unsigned this_width = my_draw_text(text, NULL, 22.0);
                        if (j->chosen) {
                                my_draw_text_deferred(td, text, 22.0, x + max_num_width - this_width, y);

                                // draw the long name if we can, otherwise use the short one
                                if (my_draw_text(j->song.title, NULL, 12.0) > (colwidth[col] - 10 - max_num_width)) {
                                        my_draw_text_deferred(td, j->song.short_title, 12.0, x + max_num_width + 10, y);
                                } else {
                                        my_draw_text_deferred(td, j->song.title, 12.0, x + max_num_width + 10, y);
                                }
                        } else {
                                my_draw_text_deferred(td, text, 22.0, x + colwidth[col] / 2 - this_width / 2, y);
                        }
                        x += colwidth[col] + 20;
                }

                // draw total
                {
                        char text[16];
                        std::sprintf(text, "%u", i->total);
                        
                        unsigned this_width = my_draw_text(text, NULL, 22.0);
                        my_draw_text_deferred(td, text, 22.0, x + colwidth[num_scores + 1] / 2 - this_width / 2, y);
                        x += colwidth[num_scores + 1] + 20;
                }

                if (show_players > 7)
                        y += 40 - (show_players - 7) * 4;
                else 
                        y += 40;
                ++row;
        }
}       

/*
 * Find out how wide each column has to be. First try unlimited width (ie.
 * long titles for everything); if that gets too long, try again with short
 * titles for chosen songs.
 */
void GroupScreen::find_column_widths(const Group &group, std::vector<unsigned> &colwidth)
{
        unsigned num_scores;
        unsigned max_num_width = my_draw_text("8888", NULL, 22.0);
        unsigned sumcolwidth;
        
        for (unsigned mode = 0; mode < 2; ++mode) {
                for (std::vector<Player>::const_iterator i = group.players.begin(); i != group.players.end(); ++i) {
                        unsigned col = 1;
                        
                        if (colwidth.size() == 0)
                                colwidth.push_back(0);
                        
                        colwidth[0] = std::max(colwidth[0], my_draw_text(i->nick, NULL, 18.0));

                        for (std::vector<Score>::const_iterator j = i->scores.begin(); j != i->scores.end(); ++j, ++col) {
                                if (colwidth.size() < col+1)
                                        colwidth.push_back(0);
                                        
                                if (j->chosen) {
                                        colwidth[col] = std::max(colwidth[col], my_draw_text((mode == 0) ? j->song.title : j->song.short_title, NULL, 12.0) + 
                                                        max_num_width + 10);
                                } else {                
                                        colwidth[col] = std::max(colwidth[col], my_draw_text(j->song.short_title, NULL, 12.0));
                                        colwidth[col] = std::max(colwidth[col], max_num_width);
                                }
                        }
                }

                num_scores = group.players[0].scores.size();

                if (colwidth.size() < num_scores + 2) {
                        colwidth.push_back(0);
                        colwidth.push_back(0);
                }
                
                colwidth[num_scores + 1] = std::max(my_draw_text("Total", NULL, 12.0), max_num_width);
                colwidth[num_scores + 2] = my_draw_text("Rank", NULL, 12.0);

                // if we're at long titles and that works, don't try the short ones
                sumcolwidth = 0;
                        
                for (unsigned i = 0; i <= num_scores + 2; ++i)
                        sumcolwidth += colwidth[i] + 20;
                        
                if (sumcolwidth < 780)
                        break;
        }

        /* 
         * If we have space to go, distribute as much as we can to the chosen song column, so we won't have
         * total and rank jumping around.
         */
        if (sumcolwidth < 780) {
                int first_chosen_col = -1;
                unsigned col = 1;

                for (std::vector<Score>::const_iterator i = group.players[0].scores.begin(); i != group.players[0].scores.end(); ++i, ++col) {
                        if (i->chosen) {
                                first_chosen_col = col;
                                break;
                        }
                }

                if (first_chosen_col != -1) {
                        colwidth[first_chosen_col] += 780 - sumcolwidth;
                }
        }
}

// some refactoring done, more should be
void GroupScreen::draw(unsigned char *buf, unsigned width, unsigned height)
{
        std::vector<TextDefer> td;
        
        scores_changed.reset_flag();
        set_screen_size(width, height);

        /*
         * We'll probably need some values from here later on (although not all), just fetch them
         * all while we're at it.
         */
        std::map<unsigned, unsigned> song_scores, player_scores;
        conn.perform(FetchMaxScoreForSongs(tournament, &song_scores));
        conn.perform(FetchMaxScoreForPlayers(tournament, round, &player_scores));
        
        Group group;
        conn.perform(FetchGroup(tournament, round, parallel, &group));
        gettimeofday(&last_updated, NULL);

        memset(buf, 0, width * height * 4);

        std::vector<unsigned> colwidth;
        
        draw_main_heading(td);
        find_column_widths(group, colwidth);
        draw_column_headings(td, group, colwidth);
        draw_scores(td, group, colwidth);
        
        unsigned num_scores = group.players[0].scores.size();

        /*
         * Approximate (but probably working quite well in practice) heuristic
         * for finding the min and max rank of a player works as follows:
         *
         * First of all, find out, for each player in the group, what the
         * maximum remaining score possibly can be (the minimum score is of
         * course identical to the player's current total). For a random song,
         * this is of course 1000 * (maximum feet rating) (but of course, that
         * depends on whether we can play single or double! for now, assume
         * double is okay, but this logic will be deferred to FetchMaxScore
         * anyhow); for a random song, we simply pick the highest-ranking song
         * we can find, EXCEPT those the player has chosen earlier AND the
         * random songs this round, AND all random songs from elimination rounds
         * (ie. rounds with only one group). (Phew!) This doesn't solve problems
         * we'd face with more than one chosen song, but it should be good enough.
         *
         * After we've found the max and min scores for all players, it's a simple
         * matter of sorting; the best attainable rank for player X is obtained if 
         * X gets max score and all others get min score, the worst attainable rank
         * is obtained if X gets min score and all others get max score.
         */
        std::vector<unsigned> max_score, min_score;
        for (std::vector<Player>::const_iterator i = group.players.begin(); i != group.players.end(); ++i) {
                unsigned min_score_tp = 0, max_score_tp = 0;
                for (std::vector<Score>::const_iterator j = i->scores.begin(); j != i->scores.end(); ++j) {
                        if (j->score != -1) {
                                // already given
                                min_score_tp += j->score;
                                max_score_tp += j->score;
                        } else {
                                unsigned max_score_this_song;
                                if (j->song.id != -1) {
                                        // random song, or we know what song the player picked
                                        max_score_this_song = song_scores[j->song.id];
                                } else {
                                        max_score_this_song = player_scores[i->id];
                                }
                                max_score_tp += max_score_this_song;
                        }
                }
                max_score.push_back(max_score_tp);
                min_score.push_back(min_score_tp);
        }

        // now finally find min and max rank, and draw it all
        unsigned show_players = get_show_players(group);
        unsigned y = (show_players <= 7) ? 140 : (140 - (show_players - 7) * 5);
        for (unsigned i = 0; i < group.players.size() && (i/num_machines) < show_players; ++i) {
                unsigned best_rank = 1, worst_rank = 1;
                for (unsigned j = 0; j < group.players.size(); ++j) {
                        if (i == j)
                                continue;

                        if (max_score[i] < min_score[j])
                                ++best_rank;
                        if (min_score[i] <= max_score[j])
                                ++worst_rank;
                }

                char text[16];
                if (best_rank == worst_rank)
                        std::sprintf(text, "%u", best_rank);
                else
                        std::sprintf(text, "%u-%u", best_rank, worst_rank);
                
                if (i % num_machines != machine)
                        continue;
                
                // find out where to place this
                unsigned x = 40 + colwidth[0];
                for (unsigned j = 1; j <= num_scores + 1; ++j)
                        x += colwidth[j] + 20;
                
                unsigned this_width = my_draw_text(text, NULL, 22.0);
                my_draw_text_deferred(td, text, 22.0, x + colwidth[num_scores + 2] / 2 - this_width / 2, y);

                if (show_players > 7)
                        y += 40 - (show_players - 7) * 4;
                else 
                        y += 40;
        }
                
        /*
         * Next up (at the bottom) is "who's playing, what will he/she be playing, and
         * optionally, how much to lead/win and how much to secure qualification" (the
         * last one only in the final round). We assume playing is done in a modified
         * zigzag; all the random songs are played first in zigzag/wrapping order (player
         * 1 song 1, player 2 song 2, player 3 song 3, player 1 song 2, player 2 song 3,
         * player 3 song 1, etc... assuming three songs and three players) and then all
         * the chosen songs are played (we assume only one chosen song).
         *
         * The lines are as follows:
         *
         * <player>
         * <song>
         * High score: <hs> by <hsplayer> at <hsevent>
         * Needs to lead: <leadscore>
         * Needs to secure qualification: <qualscore>
         * Needs to win group: <winscore>
         */
        
        /* Find the first player with the fewest songs played and part of this machine. */
        unsigned min_played_songs = 9999, num_random_songs = 0;
        Player *next_player = NULL;
        unsigned m = 0;
        for (std::vector<Player>::iterator i = group.players.begin(); i != group.players.end(); ++i) {
                unsigned this_played = 0, this_random_songs = 0;
                for (std::vector<Score>::const_iterator j = i->scores.begin(); j != i->scores.end(); ++j) {
                        if (j->score != -1)
                                ++this_played;
                        if (!j->chosen)
                                ++this_random_songs;
                }

                if ((m++ % num_machines == machine) && this_played < min_played_songs) {
                        min_played_songs = this_played;
                        next_player = &(*i);
                        num_random_songs = this_random_songs;  // should be equal for all
                }
        }

        /* Find out what song this player is supposed to play next; try random songs first */ 
        Score *next_song = NULL;

        for (unsigned i = 0; i < num_random_songs; ++i) {
                unsigned j = (i + next_player->position - 1) % num_random_songs;
                if (next_player->scores[j].score == -1) {
                        next_song = &(next_player->scores[j]);
                        break;
                }
        }

        // then all songs, if that didn't work out (slightly icky, but hey)
        if (next_song == NULL) {
                for (unsigned i = 0; i < num_scores; ++i) {
                        unsigned j = (i + next_player->position) % num_scores;
                        if (next_player->scores[j].score == -1) {
                                next_song = &(next_player->scores[j]);
                                break;
                        }
                }
        }

        if (next_song != NULL) {
                widestring text = widestring("Next player: ") + next_player->nick;
                unsigned this_width = my_draw_text(text, NULL, 24.0);
                my_draw_text(text, buf, 24.0, (LOGICAL_SCREEN_WIDTH/2) - this_width/2, 420);

                if (next_song->song.id != -1) {
                        this_width = my_draw_text(next_song->song.title, NULL, 20.0);
                        my_draw_text(next_song->song.title, buf, 20.0, (LOGICAL_SCREEN_WIDTH/2) - this_width/2, 457);

                        Highscore hs;
                        conn.perform(FetchHighscore(next_song->song.id, &hs));
                        
                        if (hs.score != -1) {
                                text = widestring("High score: ") + widestring(pqxx::to_string(hs.score)) +
                                        widestring(", by ") + hs.nick + widestring(" in ") + hs.tournament_name;
                                this_width = my_draw_text(text, NULL, 16.0);
                                my_draw_text(text, buf, 16.0, (LOGICAL_SCREEN_WIDTH/2) - this_width/2, 487);
                        }
                }

                // only show lead/win/qualify for the last song
                if (min_played_songs == num_scores - 1) {
                        /*
                         * Find out how much we need to lead, how much we need to be guaranteed
                         * to win the group, and how much we need to secure qualification. (FIXME:
                         * do the last one :-) )
                         */
                        
                        // find the best score we can get
                        unsigned max_score_this_song;
                        if (next_song->song.id != -1) {
                                // random song, or we know what song the player picked
                                max_score_this_song = song_scores[next_song->song.id];
                        } else {
                                max_score_this_song = player_scores[next_player->id];
                        }

                        unsigned y = 520;
                        
                        // see what score this player must beat to lead
                        unsigned lead_beat = 0, win_beat = 0;
                        for (unsigned i = 0; i < group.players.size(); ++i) {
                                if (group.players[i].id == next_player->id)
                                        continue;
                                
                                lead_beat = std::max(lead_beat, group.players[i].total);
                        }

                        // find the best max score among the others
                        for (unsigned i = 0; i < group.players.size(); ++i) {
                                if (group.players[i].id == next_player->id)
                                        continue;

                                win_beat = std::max(win_beat, max_score[i]);
                        }

                        /*
                         * There's a somewhat subtle point here. Normally, what a player would be interested in
                         * with regard to qualification would be a set of three values:
                         *
                         * 1. How much is the absolute minimum required to qualify, given that all others
                         *    fail?
                         * 2. How much will give a reasonable chance of qualifying, given the expected performance
                         *    of all the others?
                         * 3. How much will be enough to secure qualification, no matter what?
                         *
                         * Given perfect guessing, #2 would be "how much is needed to qualify"; however, it is
                         * completely impossible to give an exact value for that, and we're not into the guessing
                         * games. :-) #1 is often so low it's completely unrealistic (ie. far enough from #2 that
                         * it's not interesting), but #3, the most conservative estimate, is often a good measure.
                         * #3 is "how much is needed to _secure_ qualification", and that is usually what we
                         * print out when it's possible.
                         *
                         * However, in a few situations, #1 and #3 will be the exact same value, from which it
                         * follows (from the squeeze law, or just common sense :-) ) that #2 will be the same
                         * value as #1 and #3. (This usually happens near or at the end of a group.) In that
                         * case, we know the value we seek (ie. "how much is needed to qualify"), so we drop
                         * the word "secure" and just print it as-is.
                         *
                         * To find #1 and #3, we sort and pick out the values we need to beat in the best and
                         * the worst case.
                         */
                        int qualify_beat_worst_case = -1, qualify_beat_best_case = -1;

                        if (group.num_qualifying > 0) {
                                std::vector<unsigned> tmp;
                                
                                for (unsigned i = 0; i < group.players.size(); ++i) {
                                        if (group.players[i].id == next_player->id)
                                                continue;
                                        tmp.push_back(max_score[i]);
                                }
                                std::sort(tmp.begin(), tmp.end());
                                qualify_beat_worst_case = tmp[tmp.size() - group.num_qualifying];
                                
                                std::vector<unsigned> tmp2;
                                for (unsigned i = 0; i < group.players.size(); ++i) {
                                        if (group.players[i].id == next_player->id)
                                                continue;
                                        tmp2.push_back(min_score[i]);
                                }

                                std::sort(tmp2.begin(), tmp2.end());
                                qualify_beat_best_case = tmp2[tmp2.size() - group.num_qualifying];
                        }
                        
                        // print out the lines we can attain
                        if (next_player->total + max_score_this_song > lead_beat && (lead_beat != win_beat)) {
                                int lead_need = std::max(lead_beat - next_player->total + 1, 0U);
                        
                                if (lead_need > 0) {
                                        text = widestring("Needs to lead: ") + widestring(pqxx::to_string(lead_need));
                                        this_width = my_draw_text(text, NULL, 18.0);
                                        my_draw_text(text, buf, 18.0, (LOGICAL_SCREEN_WIDTH/2) - this_width/2, y);

                                        y += 30;
                                }
                        }
                        
                        if (next_player->total + max_score_this_song > win_beat) {
                                int win_need = std::max(win_beat - next_player->total + 1, 0U);
                                
                                if (win_need > 0) {
                                        text = widestring("Needs to win: ") + widestring(pqxx::to_string(win_need));

                                        this_width = my_draw_text(text, NULL, 18.0);
                                        my_draw_text(text, buf, 18.0, (LOGICAL_SCREEN_WIDTH/2) - this_width/2, y);

                                        y += 30;
                                }
                        }

                        if (group.num_qualifying > 0 &&
                            next_player->total + max_score_this_song > unsigned(qualify_beat_worst_case) &&
                            (unsigned(qualify_beat_worst_case) != win_beat)) {
                                int qual_need = std::max(qualify_beat_worst_case - next_player->total + 1, 0U);
                                
                                if (qual_need > 0) {
                                        if (qualify_beat_worst_case == qualify_beat_best_case) {
                                                text = widestring("Needs to qualify: ") + widestring(pqxx::to_string(qual_need));
                                        } else {
                                                text = widestring("Needs to secure qualification: ") + widestring(pqxx::to_string(qual_need));
                                        }
                                        
                                        this_width = my_draw_text(text, NULL, 18.0);
                                        my_draw_text(text, buf, 18.0, (LOGICAL_SCREEN_WIDTH/2) - this_width/2, y);
                                
                                        y += 30;
                                }
                        }
                }
        }
        
        valid = true;
        draw_all_deferred_text(buf, td, last_text);
        last_text = td;
}

int GroupScreen::get_priority()
{
        return 10;
}