function Controls() {}

Controls.FlyControls = function(
    camera,
    THREE,
    canvas
) {
    this.flySpeed = 25;

    this.canvas = canvas;

    this.THREE = THREE;

    this.yaw = 0;
    this.pitch = 0;
    this.canRotate = false;

    this.moveForward = false;
    this.moveBackward = false;
    this.moveLeft = false;
    this.moveRight = false;
    this.moveUp = false;
    this.moveDown = false;

    // Lock cursor
    this.havePointerLock = 'pointerLockElement' in document || 'mozPointerLockElement' in document || 'webkitPointerLockElement' in document;
    this.element = document.body;

    if (this.havePointerLock) {
        this.element.requestPointerLock = this.element.requestPointerLock || this.element.mozRequestPointerLock || this.element.webkitRequestPointerLock;
        document.exitPointerLock = document.exitPointerLock || document.mozExitPointerLock || document.webkitExitPointerLock;
    }

    this.mouseUpCallback = this.onMouseUp.bind(this);
    this.mouseDownCallback = this.onMouseDown.bind(this);
    this.mouseMoveCallback = this.onMouseMove.bind(this);
    this.keyDownCallback = this.onKeyDown.bind(this);
    this.keyUpCallback = this.onKeyUp.bind(this);
    //this.mouseClickCallback = this.onMouseClick.bind(this);

    this.camera = camera;

    // Add listeners
    this.canvas.addEventListener('keydown', this.keyDownCallback, false);
    this.canvas.addEventListener('keyup', this.keyUpCallback, false);
    this.canvas.addEventListener('mousedown', this.mouseDownCallback, false);
    this.canvas.addEventListener('mouseup', this.mouseUpCallback, false);
};

Controls.FlyControls.prototype.onMouseClick = function(event) {
    if (this.havePointerLock) {
        if (event.button == 0) {
            this.canRotate = true;
            this.element.requestPointerLock();
        } else if(event.button == 2) {
            this.canRotate = false;
            document.exitPointerLock();
        }
    }
};

Controls.FlyControls.prototype.onMouseDown = function(event) {
    if (event.button == 0) {
        this.canRotate = true;
        this.canvas.addEventListener('mousemove', this.mouseMoveCallback, false);
    }
};

Controls.FlyControls.prototype.onMouseUp = function(event) {
    if (event.button == 0) {
        this.canRotate = false;
        this.canvas.removeEventListener('mousemove', this.mouseMoveCallback);
    }
};


Controls.FlyControls.prototype.getForward = function() {
    var direction = new this.THREE.Vector3(0, 0, 1);
    var rotation = new this.THREE.Euler(0, 0, 0, "YXZ");
    rotation.set(this.pitch, this.yaw, 0, "YXZ");
    var forward = direction.applyEuler(rotation).normalize();
    return forward;
};

Controls.FlyControls.prototype.applyRotation = function(deltaTime) {
    this.camera.rotation.set(this.pitch, this.yaw, 0, "YXZ");
};

Controls.FlyControls.prototype.applyTranslation = function(deltaTime) {
    var direction = new this.THREE.Vector3(0, 0, -1);
    var rotation = new this.THREE.Euler(0, 0, 0, "YXZ");
    rotation.set(this.pitch, this.yaw, 0, "YXZ");

    direction = direction.applyEuler(rotation);

    if(this.moveForward) {

        var newPos = direction.normalize();
        this.camera.position.x += newPos.x * (deltaTime * this.flySpeed);
        this.camera.position.y += newPos.y * (deltaTime * this.flySpeed);
        this.camera.position.z += newPos.z * (deltaTime * this.flySpeed);

    } else if(this.moveBackward) {

        var newPos = direction.normalize();
        this.camera.position.x -= newPos.x * (deltaTime * this.flySpeed);
        this.camera.position.y -= newPos.y * (deltaTime * this.flySpeed);
        this.camera.position.z -= newPos.z * (deltaTime * this.flySpeed);
    }

    if(this.moveLeft) {

        var forward = direction.normalize();
        var right = forward.cross(new this.THREE.Vector3(0, 1, 0));
        var newPos = right;
        this.camera.position.x -= newPos.x * (deltaTime * this.flySpeed);
        this.camera.position.y -= newPos.y * (deltaTime * this.flySpeed);
        this.camera.position.z -= newPos.z * (deltaTime * this.flySpeed);

    } else if(this.moveRight) {

        var forward = direction.normalize();
        var right = forward.cross(new this.THREE.Vector3(0, 1, 0));
        var newPos = right;
        this.camera.position.x += newPos.x * (deltaTime * this.flySpeed);
        this.camera.position.y += newPos.y * (deltaTime * this.flySpeed);
        this.camera.position.z += newPos.z * (deltaTime * this.flySpeed);
    }

    // Absolute Y-Axis
    if(this.moveUp) {

        this.camera.position.y += (deltaTime * this.flySpeed);

    } else if(this.moveDown) {

        this.camera.position.y -= (deltaTime * this.flySpeed);

    }
};

Controls.FlyControls.prototype.update = function(deltaTime) {

};

Controls.FlyControls.prototype.onMouseMove = function ( event ) {

    if (this.canRotate) {
        var movementX = event.movementX || event.mozMovementX || event.webkitMovementX || 0;
        var movementY = event.movementY || event.mozMovementY || event.webkitMovementY || 0;

        this.yaw -= movementX * 0.002;
        this.pitch -= movementY * 0.002;
    }

    // Save mouseCoords

    // sys.mouseCoords.set( ( event.clientX / window.innerWidth ) * 2 - 1,
    //     -( event.clientY / window.innerHeight ) * 2 + 1 );

};

Controls.FlyControls.prototype.onKeyDown = function ( event ) {
    switch ( event.keyCode ) {

        case 87: // w
            this.moveForward = true;
            break;

        case 65: // a
            this.moveLeft = true;
            break;

        case 83: // s
            this.moveBackward = true;
            break;

        case 68: // d
            this.moveRight = true;
            break;

        case 32: // space
            this.moveUp = true;
            break;

        case 16:
            this.moveDown = true;
            break;
    }
};

Controls.FlyControls.prototype.onKeyUp = function ( event ) {
    switch ( event.keyCode ) {

        case 38: // up
        case 87: // w
            this.moveForward = false;
            break;

        case 37: // left
        case 65: // a
            this.moveLeft = false;
            break;

        case 40: // down
        case 83: // s
            this.moveBackward = false;
            break;

        case 39: // right
        case 68: // d
            this.moveRight = false;
            break;

        case 32: // space
            this.moveUp = false;
            break;

        case 16:
            this.moveDown = false;
            break;
    }
};

if (typeof module !== 'undefined') {
    module.exports = Controls;
}