const uuid = require('node-uuid');

const players = {};

const Game = function() {
    this.id = uuid.v4();
    this.countdownTimer = null;
    this.guess = Infinity;
}

Game.prototype.addPlayer = function(id, name) {
    if (!players[id]) {
        players[id] = name;
    }
}

Game.prototype.removePlayer = function(id) {
    players[id] = undefined;
    delete players[id];
}

Game.prototype.getPlayers = function() {
    return players;
}

Game.prototype.getRobots = function() {
    const robots = ['#E00000', '#00C000', '#0000FF', '#00C0C0', '#F000F0'];
    const squaresPerSide = 20;
    const gen = () => Math.floor(Math.random() * squaresPerSide);

    // Leave here for testing.
    // return [
    //     {i: 9, j: 9, color: '#E00000' },
    //     {i: 18, j: 9, color: '#00C000' },
    //     {i: 1, j: 9, color: '#0000FF' },
    //     {i: 9, j: 18, color: '#00C0C0' },
    //     {i: 9, j: 1, color: '#F000F0' },
    // ];

    return robots.map(color => ({ i: gen(), j: gen(), color, id: uuid.v4() }));
}

Game.prototype.getWalls = function() {
    // Edge IDs are of the form [i1-j1-i2-j2]. Top left is 0, 0.
    
    // Leave here for testing.
    // return [
    //     "1-9-1-10",
    //     "9-1-10-1",
    //     "9-19-10-19", 
    //     "19-9-19-10"
    // ];

    // console.log("Generating walls.");

    // Squares per side has quadratic relationship with wall/corner requirements.
    const squaresPerSide = 20;
    const numberOfCorners = Math.ceil(Math.pow((squaresPerSide / 10), 2));
    const numberOfWalls = Math.ceil(Math.pow((squaresPerSide / 5), 2));

    const gen = () => Math.floor(Math.random() * squaresPerSide);
    const edges = [];

    // DO NUMBER OF CORNERS FIRST AFTER TESTING
    for (let n = 0; n < numberOfWalls; n++) {
        const ri = gen();
        const rj = gen();

        const isHorizontal = Math.random() < 0.5;
        const isBackward = Math.random() < 0.5;

        let i1, j1, i2, j2;

        if (isHorizontal) {
            i1 = isBackward ? ri - 1 : ri;
            i2 = isBackward ? ri : ri + 1;

            j1 = rj;
            j2 = rj;
        } else {
            i1 = ri;
            i2 = ri;

            j1 = isBackward ? rj - 1 : rj;
            j2 = isBackward ? rj : rj + 1;
        }

        const edge = `${i1}-${j1}-${i2}-${j2}`;

        if (edges.includes(edge)) {
            n--;
        } else {
            edges.push(edge);
        }
    }

    return edges;
};

Game.prototype.onGuess = function(guess) {
    return new Promise((resolve, reject) => {
        const timeIsUp = () => {
            this.guess = Infinity;
            resolve();
        };

        if (guess < 1) {
            reject(`${guess} is less than 1.`);
            return;
        }

        if (guess >= this.guess) {
            reject(`${guess} is greater than ${this.guess}.`);
            return;
        }

        this.guess = guess;
        
        clearTimeout(this.countdownTimer);
        this.countdownTimer = setTimeout(timeIsUp, 5 * 1000);
    });
};

module.exports = Game;