var player = 1;
var gravity = 2;
var speed = 10;

var plrY = new Array(0, 0, 0);
var plrDir = new Array(0, 0, 0);
var plrIsFalling = new Array(0, 1, 1);

var KeyListener = new Object();
Key.addListener(KeyListener);

//Key controls
KeyListener.onKeyDown = function()
{
    //Jump
    if (Key.isDown(87))
    {
        //if the player isnt already jumping
        if (plrIsFalling[player] == false)
        {
            //player is now jumping
            plrIsFalling[player] = true;
            //sets base speed to launch into air
            plrY[player] = -20;
            //moves off of the surface to avoid collision issues
            _root["plr" + player]._y--;
        }
    }

    //Left
    if (Key.isDown(65))
    {
        plrDir[player] = -1;
    }

    //Right
    if (Key.isDown(68))
    {
        plrDir[player] = 1;
    }

    //Player swap button
    if(Key.isDown(81)){
       if(player == 1){
           player = 2
       }else{
           player = 1
       }

    }
};

KeyListener.onKeyUp = function()
{
    //These just reset the players direction when
    //the button is lifted up. Reversed to remove
    //priority glitch
    if (Key.isDown(68))
    {
        plrDir[player] = 1;

    }
    else if (Key.isDown(65))
    {
        plrDir[player] = -1;
    }
    else
    {
        plrDir[player] = 0;
    }
};

//Moves the currently controlled player and runs basic collision control
movePlr = function ()
{
    //Moves currently enabled player
    _root["plr" + player]._x += plrDir[player] * speed;

    //Checks edge and wall collisions for each player
    checkEdge(plr1, 1)
    checkWall(plr1, 1)

    checkEdge(plr2, 2)
    checkWall(plr2, 2)
};

//Checks if the item has fallen off the edge of a platform
checkEdge = function(item, ID){
    if(item.hitF(bottom) == false){
        plrIsFalling[ID] = true
    }
}

//Checks if item has ran into a wall
checkWall = function(item, ID){
    //Its dependent on the direction the item is currently moving
    switch(plrDir[ID]){
        case -1:
            if(item.hitF(left)){
                //Use another function to allow recursion
                shiftPlr(item, -1);
            }
            break;
        case 1:
            if(item.hitF(right)){
                shiftPlr(item, 1);
            }
    }
}

//Shifts player if they're colliding with the wall
shiftPlr = function(item, dir){
    //Moves them in the opposite direction to the way that they're walking
    item._x += dir * -1
    switch(dir){
        case -1:
            //If its still colliding
            if(item.hitF(left)){
                //RECUUURRRRSSSIIIOOOOON
                shiftPlr(item, -1);
            //if not
            }else{
                //shift it back by one so they dont get stuck
                item._x += dir * -1
            }
            break;
        case 1:
            if(item.hitF(right)){
                shiftPlr(item, 1);
            }else{
                item._x += dir
            }
            break;
    }
}

//Deals with vertical movement and collisions
falling = function ()
{
    if (plrIsFalling[1] == true)
    {
        //Basic collision check
        if (plr1.hitF(bottom) == false)
        {
            //If it hasnt hit the ground, increase the velocity and move
            plrY[1] += gravity;
            plr1._y += plrY[1];
        }
        //Not using else statement as i want to check if its hit the bottom
        //before performing the next incriment as if i dont, the graphics
        //bug the fuck out and it looks ugly
        if (plr1.hitF(bottom) == true)
        {
            //resets the variables
            plrY[1] = 0;
            plrIsFalling[1] = false;
            //Starts recursion to remove embedded player
            loopTillFloating(plr1);
        }
    }
        if (plrIsFalling[2] == true)
    {
        if (plr2.hitF(bottom) == false)
        {
            plrY[2] += gravity;
            plr2._y += plrY[2];
        }
        if (plr2.hitF(bottom) == true)
        {
            plrY[2] = 0;
            plrIsFalling[2] = false;
            loopTillFloating(plr2);
        }
    }
};

//Removes the item from any horizontal platforms
loopTillFloating = function (itemID)
{
    var item:MovieClip = itemID;
    //moves it up one
    item._y -= 1;
    //if its still imbedded
    if (item.hitF(bottom))
    {
        //do it all over again!
        loopTillFloating(itemID);
    }
};

//Its funny how these few lines basically make everything work
onEnterFrame = function ()
{
    //Run teh algorithms
    movePlr();
    falling();
};