var machine;

var renderer;

var controller;

var camera;

var cameraSpeed = {"h": 0.1, "v": 0.1, "zoom": 0.5, "pitch": 0.5, "yaw": 0.5};

var keyActionMap = {'A': moveCameraLeft,

		 'D': moveCameraRight,

		 'W': moveCameraUp,

		 'S': moveCameraDown};

var mouseActionMap = {"pitch": [[true, false, false], pitchCamera],

		      "yaw": [[true, false, false], yawCamera],

                      "wheel": zoomCamera};

include("scripts/cube.js");

include("scripts/renderer.js");

function main()

{

    var canvas = document.getElementById("machine");

    var context = new Context(canvas);

    context.expand();

    var gl = context.gl;

    var object = new Cube(1, context);

    gl.clearColor(0.0, 0.0, 0.0, 1.0);

    gl.enable(gl.DEPTH_TEST);

    machine = new Machine(object);       

    camera = new Camera(cameraSpeed, [0, 5, 20]);

    renderer = new Renderer(camera, context);

    controller = new Controller(keyActionMap, mouseActionMap, camera, machine, renderer);

    update();

    window.onresize = expandContext;

    document.onkeydown = handleKeyDown;

    document.onkeyup = handleKeyUp;

    canvas.onmousedown = handleMouseDown;

    document.onmouseup = handleMouseUp;

    document.onmousemove = handleMouseMove;

    document.onmousewheel = handleMouseWheel;

    //read("config/camera", configureCamera);

}

function configureCamera(config) {

    alert(config);

}

function update()

{    

    requestAnimFrame(update);

    controller.update();

    machine.scene.rotation.x += (random(0, 2) - 2) * 0.001; 

    machine.scene.rotation.y += (random(0, 3) - 1) * 0.001; 

    machine.scene.rotation.z += (random(0, 2) - 1) * 0.001;

    machine.update(new Date().getTime());

    renderer.update(machine.scene);

}

function random(min, max)

{

    return (min + Math.random() * (max - min));

}

function normalize(vectors)

{

    for (var v in vectors) vec3.normalize(v);

}

function Camera(speed, pos, up, right, target)

{

    this.speed = speed;

    this.pos = vec3.create(pos || [0, 0, 7]);

    this.up = vec3.create(up || [0, 1, 0]);

    this.right = vec3.create(right || [1, 0, 0]);

    this.target = vec3.create(target || [0, 0, -1]);

    normalize([this.up, this.right, this.target]);

    this.matrix = mat4.create();

}

Camera.prototype.moveLeft = function()

{

    var dir = vec3.create(this.right);

    vec3.scale(dir, -this.speed.h);

    vec3.add(this.pos, dir);

}

Camera.prototype.moveRight = function()

{

    var dir = vec3.create(this.right);

    vec3.scale(dir, this.speed.h);

    vec3.add(this.pos, dir);

}

Camera.prototype.moveUp = function()

{  

    var dir = vec3.create(this.up);

    vec3.scale(dir, this.speed.v);

    vec3.add(this.pos, dir);

}

Camera.prototype.moveDown = function()

{ 

    var dir = vec3.create(this.up);

    vec3.scale(dir, -this.speed.v);

    vec3.add(this.pos, dir);

}

Camera.prototype.zoom = function(delta) 

{

    var dir = vec3.create(this.target);

    vec3.scale(dir, delta * this.speed.zoom);

    vec3.add(this.pos, dir); 

}

Camera.prototype.pitch = function(delta)

{

    delta *= -this.speed.pitch;

    vec3.scale(this.target, Math.cos(delta));

    vec3.scale(this.up, Math.sin(delta));

    vec3.add(this.target, this.up);

    vec3.normalize(this.target);

    vec3.cross(this.target, this.right, this.up);

    vec3.scale(this.up, -1);

}

Camera.prototype.yaw = function(delta)

{

    delta *= -this.speed.yaw;

    vec3.scale(this.right, Math.cos(delta));

    vec3.scale(this.target, Math.sin(delta));

    vec3.add(this.right, this.target);

    vec3.normalize(this.right);

    vec3.cross(this.right, this.up, this.target);

    vec3.scale(this.target, -1);

}

Camera.prototype.roll = function(delta)

{

}

Camera.prototype.update = function()

{

    var x = vec3.dot(this.right, this.pos);

    var y = vec3.dot(this.up, this.pos);

    var z = vec3.dot(this.target, this.pos);

    this.matrix = mat4.create([this.right[0], this.up[0], -this.target[0], 0,

			       this.right[1], this.up[1], -this.target[1], 0,

			       this.right[2], this.up[2], -this.target[2], 0,

			       -x, -y, z, 1]);    

}

function Controller(keyActionMap, mouseActionMap, camera, machine, renderer)

{ 

    this.keyboard = new Keyboard(keyActionMap);

    this.mouse = new Mouse(mouseActionMap);

}

Controller.prototype.update = function()

{

    this.keyboard.handle();

    this.mouse.handle();

}

function Mouse(actionMap)

{

    this.actionMap = actionMap;

    this.pressed = [false, false, false];   

    this.wheelDelta = 0;

}

Mouse.prototype.buttonDown = function(event)

{

    this.pressed[event.which-1] = true;

}

Mouse.prototype.buttonUp = function(event)

{

    this.pressed[event.which-1] = false;

}

Mouse.prototype.move = function(event)

{

    this.currentPos = [event.clientX, event.clientY];

}

Mouse.prototype.moveWheel = function(event)

{ 

    this.wheelDelta += event.wheelDelta;

}

Mouse.prototype.handle = function()

{

    var pos = this.currentPos;

    if (pos && this.lastPos)

    {

	var delta = [pos[0] - this.lastPos[0], pos[1] - this.lastPos[1]];

	delta = normaliseMoveDelta(delta);

	var action = this.actionMap["pitch"];

	if (delta[1] != 0 && action) 

	{

	    for (var i = 0; i < 3; i++)

	    {

		if (this.pressed[i] != action[0][i]) break;

		if (i == 2) action[1](delta[1]);

	    }

	} 

	action = this.actionMap["yaw"];

	if (delta[0] != 0 && action) 

	{

	    for (var i = 0; i < 3; i++)

	    {

		if (this.pressed[i] != action[0][i]) break;

		if (i == 2) action[1](delta[0]);

	    }

	}

    }

    this.lastPos = pos;

    if (this.wheelDelta != 0)

    {

	var delta = normaliseWheelDelta(this.wheelDelta);

	var action = this.actionMap["wheel"];

	if (delta != 0 && action) action(delta);

	this.wheelDelta = 0;

    }

}

function normaliseMoveDelta(delta)

{

    var width = renderer.context.canvas.width;

    var height = renderer.context.canvas.height;

    return [delta[0] / width, delta[1] / height];

}

function normaliseWheelDelta(delta)

{

    return delta / 60;

}

function Keyboard(actionMap)

{

    this.actionMap = actionMap;

    this.pressed = {};

}

Keyboard.prototype.keyDown = function(event)

{

    this.pressed[event.keyCode] = true;    

}

Keyboard.prototype.keyUp = function(event)

{

    this.pressed[event.keyCode] = false;

}

Keyboard.prototype.handle = function()

{

    for (key in this.pressed)

    {

	if (this.pressed[key])

	{

	    key = String.fromCharCode(key);

	    if (this.actionMap[key]) this.actionMap[key](); 

	}

    }

}

function Machine(scene)

{

    this.scene = scene;

    this.lastUpdate = 0;

}

Machine.prototype.update = function(time)

{

    if (this.lastUpdate != 0)

    {

	var diff = time - this.lastUpdate;

    }

    this.lastUpdate = time;

}

function read(file, handler)

{

    var request = new XMLHttpRequest();

    request.open("GET", file);

    request.onreadystatechange = function() {

	alert(request.readyState);

	if (request.readyState == 4) {

	    handler(request.responseText);

	}

    }

    request.send();

}		

// event handler

function expandContext()

{

    renderer.context.expand();

}

function moveCameraLeft()

{

    camera.moveLeft();

}

function moveCameraRight()

{

    camera.moveRight();

}

function moveCameraUp()

{

    camera.moveUp();

}

function moveCameraDown()

{

    camera.moveDown();

}

function zoomCamera(delta)

{

    camera.zoom(delta);

}

function pitchCamera(delta)

{

    camera.pitch(delta);

}

function yawCamera(delta)

{

    camera.yaw(delta);

}

function handleKeyDown(event)

{

    controller.keyboard.keyDown(event);

}

function handleKeyUp(event)

{

    controller.keyboard.keyUp(event);

}

function handleMouseDown(event)

{

    controller.mouse.buttonDown(event);

}

function handleMouseUp(event)

{

    controller.mouse.buttonUp(event);

}

function handleMouseMove(event)

{

    controller.mouse.move(event);

}

function handleMouseWheel(event)

{

    controller.mouse.moveWheel(event);

}