/**
 * Lightsout
 * Nicholas Wright (http://www.nicholaswright.org/games/lightsout)
 * Created 10 / 8 / 2006
 */
function LightsOut() {
    this.intWins = 0;
    this.intTimesSurrendered = 0;
    this.intRemainingLightshowDuration = 20;
    this.strOffHexCode = "#737373";
    this.strOnHexCode = "#ffff00";
    this.strHoverHexCode = "#ff0000";
    this.objCurrentMoves = $("current_moves");
    this.objCurrentSurrenders = $("current_surrenders");
    this.objCurrentWins = $("current_wins");
    this.objWinner = $("lightsout_winner");
    this.resetGame(true);
}

LightsOut.prototype = {
    resetGame: function(boolOnInit) {
        if (!boolOnInit) {
            this.checkSurrender();
        }
        this.arrayGrid = [0, 0, 0, 0, 0,
                          0, 0, 0, 0, 0,
                          0, 0, 0, 0, 0,
                          0, 0, 0, 0, 0,
                          0, 0, 0, 0, 0];
        this.triggerLightShow();
        this.randomizeLights();
        this.intMoves = 0;
        this.objCurrentMoves.innerHTML = this.intMoves;
    },

    checkSurrender: function() {
        if ((this.intLightsOn > 0) || (this.intLightsOn < 24)) { 
            this.intTimesSurrendered++;
            this.objCurrentSurrenders.innerHTML = this.intTimesSurrendered;
        }
    },

    checkForWin: function() {
        if ((this.intLightsOn == 0) || (this.intLightsOn == 24)) {
            this.intWins++;
            this.objCurrentWins.innerHTML = this.intWins;
            this.notifyWinner();
            this.resetGame(true);
        }
    },

    hoverOn: function(objElement) {
        objElement.style.backgroundColor = this.strHoverHexCode; 
    },

    hoverOff: function(objElement) {
        this.drawLight(this.grabLightNumber(objElement));
    },

    random: function() {
        return (Math.random() > 0.5) ? 1 : 0;
    },

    randomizeLights: function() {
        for (var i = 0; i < 25; i++) {
            this.updateGridIndex(i, this.random());
        }
    },

    notifyWinner: function() {
        alert( "Congratulations! You've won!\n\nSince you've got skills why not try again?" );
        // this.objWinner.show();
    },

    hideNotifyWinner: function() {
        this.objWinner.hide();
    },

    grabLightNumber: function(objElement) {
        return Number(objElement.id.split("_").last());
    },

    triggerLightShow: function() {
        this.intRemainingLightshowDuration = 20;
        setInterval( this.displayLightShow.bind( this ), 100 );
    },

    displayLightShow: function() {
        if ( this.intRemainingLightshowDuration > 0 ) {
            this.randomizeLights();
            this.intRemainingLightshowDuration--;
        } else {
            clearInterval();
        }
    },

    updateLightsOn: function() {
        this.intLightsOn = 0;
        this.arrayGrid.each( function( n ) {
            this.intLightsOn += n
        }.bind( this ) );
        return this.intLightsOn;
    },

    updateGridIndex: function(intIndex, intFlipTo) {
        this.arrayGrid[intIndex] = intFlipTo;
        this.drawLight(intIndex);
    },

    toggleLightsForSelection: function(objElement) {
        var id = this.grabLightNumber(objElement);
        this.toggleLight(id - 5);
        this.toggleLight(id + 5);
        var left = id - 1;
        var right = id + 1;
        if (![4, 9, 14, 19, 24].include(left)) {
            this.toggleLight(left);
        }

        if ((right % 5) != 0) {
            this.toggleLight(right);
        }
        this.toggleLight(id);
        this.updateLightsOn();
        this.checkForWin();
        this.intMoves++;
        this.objCurrentMoves.innerHTML = this.intMoves;
    },

    toggleLight: function(intIndex) {
        if ((intIndex >= 0) && (intIndex <= 24)) {
            var intFlipTo = (this.arrayGrid[intIndex] == 0) ? 1 : 0;
            this.updateGridIndex(intIndex, intFlipTo);
            this.drawLight(intIndex);
            return true;
        }
        return false;
    },

    drawLights: function() {
        for (var i = 0; i < 25; i++) {
          this.drawLight(i);
        }
    },

    drawLight: function(strId) {
        $("square_" + strId).style.backgroundColor = (this.arrayGrid[strId] == 0) ? this.strOffHexCode : this.strOnHexCode; 
    }
};

Objective
The main goal in LightsOut is to toggle all of the lights on or off in as few moves as possible.

Instructions
At the start of each new game, all of the room lights are randomized. Clicking on a room will toggle that room's light on or off depending on it's starting position. It will also perform the same action on the immediate rooms both horizontally and vertically.

You may restart the game at any time by clicking the button labeled "Start Over". Doing this will increment your retry count, and is considered surrendering.