//===== Constructor
const Controls = function() {
    this.names = {};
    this.playerId = null;
    this.countdownTimer = null;

    this.currentMoveCount = 0;
    this.winningMoveCount = Infinity;

    // "Local" and "Global" messages
    document.addEventListener('L-conn-error', this.msgConnectionError.bind(this));
    document.addEventListener('L-complete', this.msgComplete.bind(this));
    document.addEventListener('L-join', this.msgJoin.bind(this));
    document.addEventListener('L-replay-complete', this.msgReplayComplete.bind(this));
    document.addEventListener('L-skip', this.msgSkip.bind(this));
    document.addEventListener('L-stack', this.msgStack.bind(this));

    document.addEventListener('G-connected', this.msgConnected.bind(this)); 
    document.addEventListener('G-countdown', this.msgCountdown.bind(this)); 
    document.addEventListener('G-full', this.msgFull.bind(this)); 
    document.addEventListener('G-newround', this.msgNewRound.bind(this));
    document.addEventListener('G-players', this.msgPlayers.bind(this)); 
    document.addEventListener('G-state', this.msgState.bind(this));
    document.addEventListener('G-win', this.msgWin.bind(this));
 
    // Click handlers
    document.getElementById('controls-moves-reset').addEventListener('click', this.onClickMovesReset.bind(this));
    document.getElementById('controls-moves-undo').addEventListener('click', this.onClickMovesUndo.bind(this));
    document.getElementById('controls-moves-solve').addEventListener('click', this.onClickMovesSolve.bind(this));

    document.getElementById('controls-options-objective').addEventListener('click', this.onClickOptionsObjective.bind(this));
    document.getElementById('controls-options-robots').addEventListener('click', this.onClickOptionsRobots.bind(this));
    document.getElementById('controls-options-walls').addEventListener('click', this.onClickOptionsWalls.bind(this));

    document.getElementById('controls-countdown-skip').addEventListener('click', this.onClickCountdownSkip.bind(this));
    document.getElementById('controls-win-next').addEventListener('click', this.onClickWinNext.bind(this));

    this.setState('CONNECTING');
}

//===== Countdown

Controls.prototype.countdownStart = function(seconds) {
    clearTimeout(this.countdownTimer);
    this.countdownTimer = this.countdownTick.bind(this);

    const countdown = document.getElementById('controls-countdown-value');
    countdown.dataset.tick = seconds * 1;

    this.countdownTick();
};

Controls.prototype.countdownTick = function() {
    const countdown = document.getElementById('controls-countdown-value');
    const tick = countdown.dataset.tick * 1;
    countdown.dataset.tick = tick - 1; 

    countdown.innerHTML = tick;

    if (tick === 0) {
        this.countdownComplete();
        return;
    }

    this.countdownTimer = setTimeout(this.countdownTick.bind(this), 1000);
};

Controls.prototype.countdownComplete = function() {
    clearTimeout(this.countdownTimer);
    document.getElementById('controls-countdown-value').innerHTML = 0; 
};

//===== UI
Controls.prototype.setState = function(state) {
    const blocks = [
        'controls-connection',
        'controls-countdown',
        'controls-moves',
        'controls-options',
        'controls-players',
        'controls-win',
    ];

    blocks.forEach(id => document.getElementById(id).style.display = 'none');

    // IDs to show for each state.
    const STATE = {
        CONNECTING: ['controls-connection'],
        PLAY: ['controls-players', 'controls-moves', 'controls-options'],
        COUNTDOWN: ['controls-players', 'controls-moves', 'controls-countdown'],
        WIN: ['controls-players', 'controls-win']
    };

    (STATE[state] || []).forEach(id => document.getElementById(id).style.display = 'block');
};

Controls.prototype.drawPlayers = function() {
    const container = document.getElementById('controls-players');
    container.querySelectorAll('.controls-player').forEach(el => {
        container.removeChild(el);
    });

    const keys = Object.keys(this.names);

    keys.forEach(connectionId => {
        const n = document.createElement('div');
        n.innerHTML = this.playerId === connectionId ? `${this.names[connectionId]} (you)` : this.names[connectionId];
        n.className = 'controls-player';
        container.appendChild(n)
    });

    const msg = container.querySelector('.controls-message');
    msg.innerHTML = (keys.length > 0 ? '' : 'Nobody is in the game yet.');
    msg.style.display = (keys.length > 0 ? 'none' : 'block');
};

//===== Message handlers

Controls.prototype.msgJoin = function() {
    this.setState('CONNECTING');
    document.querySelector('#controls-connection .controls-message').innerHTML = 'Connecting...';
};

Controls.prototype.msgComplete = function(evt) {
    if (this.currentMoveCount < this.winningMoveCount) {
        document.getElementById('controls-moves-solve').style.display = (evt.detail.complete ? 'block' : 'none');
    }
};

Controls.prototype.msgConnected = function(evt) {
    this.playerId = evt.detail.body.player_id;  

    Cookie.setCookie({ name: 'player_name', value: evt.detail.body.player_name, days: 1 });
    Cookie.setCookie({ name: 'player_id', value: this.playerId, days: 1 });
    
    this.drawPlayers();
};

Controls.prototype.msgConnectionError = function(evt) {
    this.setState('CONNECTING');

    const msg = (evt.detail === 'noname' 
        ? "Didn't get your name - refresh to try again." 
        : "Can't reach the server.");

    document.querySelector('#controls-connection .controls-message').innerHTML = msg;
};

Controls.prototype.msgFull = function() {
    this.setState('CONNECTING');
    document.querySelector('#controls-connection .controls-message').innerHTML = "Sorry, the game is full right now. Please try again later.";
};

Controls.prototype.msgCountdown = function(evt) {
    this.winningMoveCount = evt.detail.body.moveCount;
    
    document.getElementById('controls-countdown-moves').innerHTML = evt.detail.body.moveCount;
    document.getElementById('controls-countdown-player').innerHTML = `${this.names[evt.detail.body.id]} has a solution!`;

    const { duration, timestamp } = evt.detail.body;

    const now = new Date().getTime();
    const diff = Math.ceil((now - timestamp) / 1000);
    const remaining = duration - diff;

    this.countdownStart(remaining);
};

Controls.prototype.msgSkip = function() {
    this.countdownComplete();
};

Controls.prototype.msgStack = function(evt) {
    const robots = evt.detail.reduce((acc, { id }) => acc.has(id) ? acc : acc.add(id), new Set());
    this.currentMoveCount = evt.detail.length - robots.size;

    document.getElementById('controls-moves-solve').style.display = 'none';

    document.getElementById('controls-moves-count').innerHTML = this.currentMoveCount;

    document.getElementById('controls-moves-reset').style.display = this.currentMoveCount > 0 ? 'block' : 'none';
    document.getElementById('controls-moves-undo').style.display = this.currentMoveCount > 0 ? 'block' : 'none';
};

Controls.prototype.msgPlayers = function(evt) {
    this.names = evt.detail.body;
    this.drawPlayers();
};

Controls.prototype.msgState = function(evt) {
    this.setState(evt.detail.body);
};

Controls.prototype.msgWin = function(evt) {
    document.getElementById('controls-win-message').innerHTML = `Congratulations ${this.names[evt.detail.body.player_id]} !`;
    document.getElementById('controls-win-count').innerHTML = evt.detail.body.moveCount;
};

Controls.prototype.msgNewRound = function() {
    this.winningMoveCount = Infinity;
    document.getElementById('controls-win-next').style.display = 'none';
};

Controls.prototype.msgReplayComplete = function() {
    document.getElementById('controls-win-next').style.display = 'block';
};

//===== Click handlers

Controls.prototype.dispatch = function(evt, data) {
    const e = (data ? new CustomEvent(evt, { detail: data }) : new Event(evt));
    document.dispatchEvent(e);
};

// Options block

Controls.prototype.onClickOptionsObjective = function() {
    this.dispatch('L-objective');
};

Controls.prototype.onClickOptionsRobots = function() {
    this.dispatch('L-robots');
};

Controls.prototype.onClickOptionsWalls = function() {
    this.dispatch('L-walls');
};

// Moves block

Controls.prototype.onClickMovesReset = function() {
    this.dispatch('L-reset');
};

Controls.prototype.onClickMovesSolve = function() {
    this.dispatch('L-submit');
};

Controls.prototype.onClickMovesUndo = function() {
    this.dispatch('L-undo');
};

// Countdown/win block

Controls.prototype.onClickCountdownSkip = function() {
    this.dispatch('L-skip');
};

Controls.prototype.onClickWinNext = function() {
    this.dispatch('L-newround');
};