var unit = 15;
var uwh = 20;
var canMove = false;
var dir = 2;
var score = 0;
aPieceList = new Array();
mouseListener = new Object();
mouseListener.onMouseDown = function()
{
        if (!canMove)
        {
                canMove = true;
                startGame();
        }
};
Mouse.addListener(mouseListener);
k = new Object();
k.onKeyDown = function()
{
        var k = Key.getCode();
        if (k == Key.UP && dir != 2 && canMove)
        {
                dir = 0;
                canMove = false;
        }
        else if (k == Key.LEFT && dir != 3 && canMove)
        {
                dir = 1;
                canMove = false;
        }
        else if (k == Key.DOWN && dir != 0 && canMove)
        {
                dir = 2;
                canMove = false;
        }
        else if (k == Key.RIGHT && dir != 1 && canMove)
        {
                dir = 3;
                canMove = false;
        }
};
Key.addListener(k);
function addPiece()
{
        var p = this.attachMovie("piece", "piece" + aPieceList.length, aPieceList.length);
        p._x = aPieceList[aPieceList.length - 1]._x;
        p._y = aPieceList[aPieceList.length - 1]._y;
        aPieceList.push(p);
}
function moveFood()
{
        var moveIt = true;
        while (moveIt)
        {
                food._x = Math.floor(Math.random() * uwh) * unit;
                food._y = Math.floor(Math.random() * uwh) * unit;
                moveIt = false;
                for (var i = 0; i < aPieceList.length; i++)
                {
                        if (aPieceList[i]._x == food._x && aPieceList[i]._y == food._y)
                        {
                                moveIt = true;
                        }
                }
        }
}
function gameOver()
{
        delete this.onEnterFrame;
        tScore.text = "You Lose.   Score: " + score;
        canMove = false;
}
function startGame()
{
        for (var i = aPieceList.length - 1; i >= 0; i--)
        {
                aPieceList[i].removeMovieClip();
                aPieceList.pop();
        }
        score = 0;
        var p = this.attachMovie("piece", "piece" + aPieceList.length, aPieceList.length);
        aPieceList.push(p);
        p._x = 10 * unit;
        p._y = 10 * unit;
        var food = this.attachMovie("food", "food", -1);
        var c = 0;
        moveFood();
        var startingLength = 3;
        for (var i = 1; i < startingLength; i++)
        {
                addPiece();
        }
        this.onEnterFrame = function()
        {
                canMove = true;
                tScore.text = score;
                for (var i = aPieceList.length - 1; i > 0; i--)
                {
                        aPieceList[i]._x = aPieceList[i - 1]._x;
                        aPieceList[i]._y = aPieceList[i - 1]._y;
                }
                if (dir == 0)
                {
                        aPieceList[0]._y -= unit;
                }
                else if (dir == 1)
                {
                        aPieceList[0]._x -= unit;
                }
                else if (dir == 2)
                {
                        aPieceList[0]._y += unit;
                }
                else if (dir == 3)
                {
                        aPieceList[0]._x += unit;
                }
                if (aPieceList[0]._y / unit == 20)
                {
                        aPieceList[0]._y = 0;
                }
                else if (aPieceList[0]._y / unit == -1)
                {
                        aPieceList[0]._y = 19 * unit;
                }
                else if (aPieceList[0]._x / unit == -1)
                {
                        aPieceList[0]._x = 19 * unit;
                }
                else if (aPieceList[0]._x / unit == 20)
                {
                        aPieceList[0]._x = 0;
                }
                if (aPieceList[0]._x == food._x && aPieceList[0]._y == food._y)
                {
                        score += 10 * aPieceList.length / 2;
                        moveFood();
                        addPiece();
                }
                for (var i = 1; i < aPieceList.length; i++)
                {
                        if (aPieceList[0]._x == aPieceList[i]._x && aPieceList[0]._y == aPieceList[i]._y)
                        {
                                gameOver();
                        }
                }
        };
}