/**
 * @author qiao / https://github.com/qiao
 * @author mrdoob / http://mrdoob.com
 * @author alteredq / http://alteredqualia.com/
 * @author WestLangley / http://github.com/WestLangley
 * @author erich666 / http://erichaines.com
 */

// This set of controls performs orbiting, dollying (zooming), and panning.
// Unlike TrackballControls, it maintains the "up" direction object.up (+Y by
// default).
//
//    Orbit - left mouse / touch: one finger move
//    Zoom - middle mouse, or mousewheel / touch: two finger spread or squish
//    Pan - right mouse, or arrow keys / touch: three finger swipe

THREE.OrbitControls = function(object, domElement) {

	this.object = object;

	this.domElement = (domElement !== undefined) ? domElement : document;

	// Set to false to disable this control
	this.enabled = true;

	// "target" sets the location of focus, where the object orbits around
	this.target = new THREE.Vector3();

	// How far you can dolly in and out ( PerspectiveCamera only )
	this.minDistance = 0;
	this.maxDistance = Infinity;

	// How far you can zoom in and out ( OrthographicCamera only )
	this.minZoom = 0;
	this.maxZoom = Infinity;

	// How far you can orbit vertically, upper and lower limits.
	// Range is 0 to Math.PI radians.
	this.minPolarAngle = 0;		  // radians
	this.maxPolarAngle = Math.PI; // radians

	// How far you can orbit horizontally, upper and lower limits.
	// If set, must be a sub-interval of the interval [ - Math.PI, Math.PI ].
	this.minAzimuthAngle = -Infinity; // radians
	this.maxAzimuthAngle = Infinity;  // radians

	// Set to true to enable damping (inertia)
	// If damping is enabled, you must call controls.update() in your animation
	// loop
	this.enableDamping = false;
	this.dampingFactor = 0.25;

	// This option actually enables dollying in and out; left as "zoom" for
	// backwards compatibility.
	// Set to false to disable zooming
	this.enableZoom = true;
	this.zoomSpeed = 1.0;

	// Set to false to disable rotating
	this.enableRotate = true;
	this.rotateSpeed = 1.0;

	// Set to false to disable panning
	this.enablePan = true;
	this.keyPanSpeed = 7.0; // pixels moved per arrow key push

	// Set to true to automatically rotate around the target
	// If auto-rotate is enabled, you must call controls.update() in your
	// animation loop
	this.autoRotate = false;
	this.autoRotateSpeed = 2.0; // 30 seconds per round when fps is 60

	// Set to false to disable use of the keys
	this.enableKeys = true;

	// The four arrow keys
	this.keys = {LEFT : 37, UP : 38, RIGHT : 39, BOTTOM : 40};

	// Mouse buttons
	this.mouseButtons = {ORBIT : THREE.MOUSE.LEFT, ZOOM : THREE.MOUSE.MIDDLE, PAN : THREE.MOUSE.RIGHT};

	// for reset
	this.target0 = this.target.clone();
	this.position0 = this.object.position.clone();
	this.zoom0 = this.object.zoom;

	//
	// public methods
	//

	this.getPolarAngle = function() {

		return spherical.phi;

	};

	this.getAzimuthalAngle = function() {

		return spherical.theta;

	};

	this.saveState = function() {

		scope.target0.copy(scope.target);
		scope.position0.copy(scope.object.position);
		scope.zoom0 = scope.object.zoom;

	};

	this.reset = function() {

		scope.target.copy(scope.target0);
		scope.object.position.copy(scope.position0);
		scope.object.zoom = scope.zoom0;

		scope.object.updateProjectionMatrix();
		scope.dispatchEvent(changeEvent);

		scope.update();

		state = STATE.NONE;

	};

	// this method is exposed, but perhaps it would be better if we can make it
	// private...
	this.update = function() {

		var offset = new THREE.Vector3();

		// so camera.up is the orbit axis
		var quat = new THREE.Quaternion().setFromUnitVectors(object.up, new THREE.Vector3(0, 1, 0));
		var quatInverse = quat.clone().inverse();

		var lastPosition = new THREE.Vector3();
		var lastQuaternion = new THREE.Quaternion();

		return function update() {

			var position = scope.object.position;

			offset.copy(position).sub(scope.target);

			// rotate offset to "y-axis-is-up" space
			offset.applyQuaternion(quat);

			// angle from z-axis around y-axis
			spherical.setFromVector3(offset);

			if (scope.autoRotate && state === STATE.NONE) {

				rotateLeft(getAutoRotationAngle());
			}

			spherical.theta += sphericalDelta.theta;
			spherical.phi += sphericalDelta.phi;

			// restrict theta to be between desired limits
			spherical.theta = Math.max(scope.minAzimuthAngle, Math.min(scope.maxAzimuthAngle, spherical.theta));

			// restrict phi to be between desired limits
			spherical.phi = Math.max(scope.minPolarAngle, Math.min(scope.maxPolarAngle, spherical.phi));

			spherical.makeSafe();

			spherical.radius *= scale;

			// restrict radius to be between desired limits
			spherical.radius = Math.max(scope.minDistance, Math.min(scope.maxDistance, spherical.radius));

			// move target to panned location
			scope.target.add(panOffset);

			offset.setFromSpherical(spherical);

			// rotate offset back to "camera-up-vector-is-up" space
			offset.applyQuaternion(quatInverse);

			position.copy(scope.target).add(offset);

			scope.object.lookAt(scope.target);

			if (scope.enableDamping === true) {

				sphericalDelta.theta *= (1 - scope.dampingFactor);
				sphericalDelta.phi *= (1 - scope.dampingFactor);

			} else {

				sphericalDelta.set(0, 0, 0);
			}

			scale = 1;
			panOffset.set(0, 0, 0);

			// update condition is:
			// min(camera displacement, camera rotation in radians)^2 > EPS
			// using small-angle approximation cos(x/2) = 1 - x^2 / 8

			if (zoomChanged || lastPosition.distanceToSquared(scope.object.position) > EPS ||
				8 * (1 - lastQuaternion.dot(scope.object.quaternion)) > EPS) {

				scope.dispatchEvent(changeEvent);

				lastPosition.copy(scope.object.position);
				lastQuaternion.copy(scope.object.quaternion);
				zoomChanged = false;

				return true;
				}

			return false;

		};

	}();

	this.dispose = function() {

		scope.domElement.removeEventListener('contextmenu', onContextMenu, false);
		scope.domElement.removeEventListener('mousedown', onMouseDown, false);
		scope.domElement.removeEventListener('wheel', onMouseWheel, false);

		scope.domElement.removeEventListener('touchstart', onTouchStart, false);
		scope.domElement.removeEventListener('touchend', onTouchEnd, false);
		scope.domElement.removeEventListener('touchmove', onTouchMove, false);

		document.removeEventListener('mousemove', onMouseMove, false);
		document.removeEventListener('mouseup', onMouseUp, false);

		window.removeEventListener('keydown', onKeyDown, false);

		// scope.dispatchEvent( { type: 'dispose' } ); // should this be added
		// here?

	};

	//
	// internals
	//

	var scope = this;

	var changeEvent = {type : 'change'};
	var startEvent = {type : 'start'};
	var endEvent = {type : 'end'};

	var STATE = {NONE : -1, ROTATE : 0, DOLLY : 1, PAN : 2, TOUCH_ROTATE : 3, TOUCH_DOLLY : 4, TOUCH_PAN : 5};

	var state = STATE.NONE;

	var EPS = 0.000001;

	// current position in spherical coordinates
	var spherical = new THREE.Spherical();
	var sphericalDelta = new THREE.Spherical();

	var scale = 1;
	var panOffset = new THREE.Vector3();
	var zoomChanged = false;

	var rotateStart = new THREE.Vector2();
	var rotateEnd = new THREE.Vector2();
	var rotateDelta = new THREE.Vector2();

	var panStart = new THREE.Vector2();
	var panEnd = new THREE.Vector2();
	var panDelta = new THREE.Vector2();

	var dollyStart = new THREE.Vector2();
	var dollyEnd = new THREE.Vector2();
	var dollyDelta = new THREE.Vector2();

	function getAutoRotationAngle() { return 2 * Math.PI / 60 / 60 * scope.autoRotateSpeed; }

	function getZoomScale() { return Math.pow(0.95, scope.zoomSpeed); }

	function rotateLeft(angle) { sphericalDelta.theta -= angle; }

	function rotateUp(angle) { sphericalDelta.phi -= angle; }

	var panLeft = function() {

		var v = new THREE.Vector3();

		return function panLeft(distance, objectMatrix) {

			v.setFromMatrixColumn(objectMatrix, 0); // get X column of objectMatrix
			v.multiplyScalar(-distance);

			panOffset.add(v);

		};

	}();

	var panUp = function() {

		var v = new THREE.Vector3();

		return function panUp(distance, objectMatrix) {

			v.setFromMatrixColumn(objectMatrix, 1); // get Y column of objectMatrix
			v.multiplyScalar(distance);

			panOffset.add(v);

		};

	}();

	// deltaX and deltaY are in pixels; right and down are positive
	var pan = function() {

		var offset = new THREE.Vector3();

		return function pan(deltaX, deltaY) {

			var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

			if (scope.object.isPerspectiveCamera) {

				// perspective
				var position = scope.object.position;
				offset.copy(position).sub(scope.target);
				var targetDistance = offset.length();

				// half of the fov is center to top of screen
				targetDistance *= Math.tan((scope.object.fov / 2) * Math.PI / 180.0);

				// we actually don't use screenWidth, since perspective camera
				// is fixed to screen height
				panLeft(2 * deltaX * targetDistance / element.clientHeight, scope.object.matrix);
				panUp(2 * deltaY * targetDistance / element.clientHeight, scope.object.matrix);

			} else if (scope.object.isOrthographicCamera) {

				// orthographic
				panLeft(deltaX * (scope.object.right - scope.object.left) / scope.object.zoom / element.clientWidth,
						scope.object.matrix);
				panUp(deltaY * (scope.object.top - scope.object.bottom) / scope.object.zoom / element.clientHeight,
					  scope.object.matrix);

			} else {

				// camera neither orthographic nor perspective
				console.warn('WARNING: OrbitControls.js encountered an unknown camera type - pan disabled.');
				scope.enablePan = false;
			}

		};

	}();

	function dollyIn(dollyScale) {

		if (scope.object.isPerspectiveCamera) {

			scale /= dollyScale;

		} else if (scope.object.isOrthographicCamera) {

			scope.object.zoom = Math.max(scope.minZoom, Math.min(scope.maxZoom, scope.object.zoom * dollyScale));
			scope.object.updateProjectionMatrix();
			zoomChanged = true;

		} else {

			console.warn('WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.');
			scope.enableZoom = false;
		}
		}

	function dollyOut(dollyScale) {

		if (scope.object.isPerspectiveCamera) {

			scale *= dollyScale;

		} else if (scope.object.isOrthographicCamera) {

			scope.object.zoom = Math.max(scope.minZoom, Math.min(scope.maxZoom, scope.object.zoom / dollyScale));
			scope.object.updateProjectionMatrix();
			zoomChanged = true;

		} else {

			console.warn('WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.');
			scope.enableZoom = false;
		}
		}

	//
	// event callbacks - update the object state
	//

	function handleMouseDownRotate(event) {

		// console.log( 'handleMouseDownRotate' );

		rotateStart.set(event.clientX, event.clientY);
		}

	function handleMouseDownDolly(event) {

		// console.log( 'handleMouseDownDolly' );

		dollyStart.set(event.clientX, event.clientY);
		}

	function handleMouseDownPan(event) {

		// console.log( 'handleMouseDownPan' );

		panStart.set(event.clientX, event.clientY);
		}

	function handleMouseMoveRotate(event) {

		// console.log( 'handleMouseMoveRotate' );

		rotateEnd.set(event.clientX, event.clientY);
		rotateDelta.subVectors(rotateEnd, rotateStart);

		var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

		// rotating across whole screen goes 360 degrees around
		rotateLeft(2 * Math.PI * rotateDelta.x / element.clientWidth * scope.rotateSpeed);

		// rotating up and down along whole screen attempts to go 360, but
		// limited to 180
		rotateUp(2 * Math.PI * rotateDelta.y / element.clientHeight * scope.rotateSpeed);

		rotateStart.copy(rotateEnd);

		scope.update();
		}

	function handleMouseMoveDolly(event) {

		// console.log( 'handleMouseMoveDolly' );

		dollyEnd.set(event.clientX, event.clientY);

		dollyDelta.subVectors(dollyEnd, dollyStart);

		if (dollyDelta.y > 0) {

			dollyIn(getZoomScale());

		} else if (dollyDelta.y < 0) {

			dollyOut(getZoomScale());
		}

		dollyStart.copy(dollyEnd);

		scope.update();
		}

	function handleMouseMovePan(event) {

		// console.log( 'handleMouseMovePan' );

		panEnd.set(event.clientX, event.clientY);

		panDelta.subVectors(panEnd, panStart);

		pan(panDelta.x, panDelta.y);

		panStart.copy(panEnd);

		scope.update();
		}

	function handleMouseUp(event) {

		// console.log( 'handleMouseUp' );
		}

	function handleMouseWheel(event) {

		// console.log( 'handleMouseWheel' );

		if (event.deltaY < 0) {

			dollyOut(getZoomScale());

		} else if (event.deltaY > 0) {

			dollyIn(getZoomScale());
		}

		scope.update();
		}

	function handleKeyDown(event) {

		// console.log( 'handleKeyDown' );

		switch (event.keyCode) {

		case scope.keys.UP:
			pan(0, scope.keyPanSpeed);
			scope.update();
			break;

		case scope.keys.BOTTOM:
			pan(0, -scope.keyPanSpeed);
			scope.update();
			break;

		case scope.keys.LEFT:
			pan(scope.keyPanSpeed, 0);
			scope.update();
			break;

		case scope.keys.RIGHT:
			pan(-scope.keyPanSpeed, 0);
			scope.update();
			break;
		}
		}

	function handleTouchStartRotate(event) {

		// console.log( 'handleTouchStartRotate' );

		rotateStart.set(event.touches[0].pageX, event.touches[0].pageY);
		}

	function handleTouchStartDolly(event) {

		// console.log( 'handleTouchStartDolly' );

		var dx = event.touches[0].pageX - event.touches[1].pageX;
		var dy = event.touches[0].pageY - event.touches[1].pageY;

		var distance = Math.sqrt(dx * dx + dy * dy);

		dollyStart.set(0, distance);
		}

	function handleTouchStartPan(event) {

		// console.log( 'handleTouchStartPan' );

		panStart.set(event.touches[0].pageX, event.touches[0].pageY);
		}

	function handleTouchMoveRotate(event) {

		// console.log( 'handleTouchMoveRotate' );

		rotateEnd.set(event.touches[0].pageX, event.touches[0].pageY);
		rotateDelta.subVectors(rotateEnd, rotateStart);

		var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

		// rotating across whole screen goes 360 degrees around
		rotateLeft(2 * Math.PI * rotateDelta.x / element.clientWidth * scope.rotateSpeed);

		// rotating up and down along whole screen attempts to go 360, but
		// limited to 180
		rotateUp(2 * Math.PI * rotateDelta.y / element.clientHeight * scope.rotateSpeed);

		rotateStart.copy(rotateEnd);

		scope.update();
		}

	function handleTouchMoveDolly(event) {

		// console.log( 'handleTouchMoveDolly' );

		var dx = event.touches[0].pageX - event.touches[1].pageX;
		var dy = event.touches[0].pageY - event.touches[1].pageY;

		var distance = Math.sqrt(dx * dx + dy * dy);

		dollyEnd.set(0, distance);

		dollyDelta.subVectors(dollyEnd, dollyStart);

		if (dollyDelta.y > 0) {

			dollyOut(getZoomScale());

		} else if (dollyDelta.y < 0) {

			dollyIn(getZoomScale());
		}

		dollyStart.copy(dollyEnd);

		scope.update();
		}

	function handleTouchMovePan(event) {

		// console.log( 'handleTouchMovePan' );

		panEnd.set(event.touches[0].pageX, event.touches[0].pageY);

		panDelta.subVectors(panEnd, panStart);

		pan(panDelta.x, panDelta.y);

		panStart.copy(panEnd);

		scope.update();
		}

	function handleTouchEnd(event) {

		// console.log( 'handleTouchEnd' );
		}

	//
	// event handlers - FSM: listen for events and reset state
	//

	function onMouseDown(event) {

		if (scope.enabled === false)
			return;

		event.preventDefault();

		switch (event.button) {

		case scope.mouseButtons.ORBIT:

			if (scope.enableRotate === false)
				return;

			handleMouseDownRotate(event);

			state = STATE.ROTATE;

			break;

		case scope.mouseButtons.ZOOM:

			if (scope.enableZoom === false)
				return;

			handleMouseDownDolly(event);

			state = STATE.DOLLY;

			break;

		case scope.mouseButtons.PAN:

			if (scope.enablePan === false)
				return;

			handleMouseDownPan(event);

			state = STATE.PAN;

			break;
			}

		if (state !== STATE.NONE) {

			document.addEventListener('mousemove', onMouseMove, false);
			document.addEventListener('mouseup', onMouseUp, false);

			scope.dispatchEvent(startEvent);
		}
		}

	function onMouseMove(event) {

		if (scope.enabled === false)
			return;

		event.preventDefault();

		switch (state) {

		case STATE.ROTATE:

			if (scope.enableRotate === false)
				return;

			handleMouseMoveRotate(event);

			break;

		case STATE.DOLLY:

			if (scope.enableZoom === false)
				return;

			handleMouseMoveDolly(event);

			break;

		case STATE.PAN:

			if (scope.enablePan === false)
				return;

			handleMouseMovePan(event);

			break;
		}
		}

	function onMouseUp(event) {

		if (scope.enabled === false)
			return;

		handleMouseUp(event);

		document.removeEventListener('mousemove', onMouseMove, false);
		document.removeEventListener('mouseup', onMouseUp, false);

		scope.dispatchEvent(endEvent);

		state = STATE.NONE;
		}

	function onMouseWheel(event) {

		if (scope.enabled === false || scope.enableZoom === false || (state !== STATE.NONE && state !== STATE.ROTATE))
			return;

		event.preventDefault();
		event.stopPropagation();

		scope.dispatchEvent(startEvent);

		handleMouseWheel(event);

		scope.dispatchEvent(endEvent);
		}

	function onKeyDown(event) {

		if (scope.enabled === false || scope.enableKeys === false || scope.enablePan === false)
			return;

		handleKeyDown(event);
		}

	function onTouchStart(event) {

		if (scope.enabled === false)
			return;

		switch (event.touches.length) {

		case 1: // one-fingered touch: rotate

			if (scope.enableRotate === false)
				return;

			handleTouchStartRotate(event);

			state = STATE.TOUCH_ROTATE;

			break;

		case 2: // two-fingered touch: dolly

			if (scope.enableZoom === false)
				return;

			handleTouchStartDolly(event);

			state = STATE.TOUCH_DOLLY;

			break;

		case 3: // three-fingered touch: pan

			if (scope.enablePan === false)
				return;

			handleTouchStartPan(event);

			state = STATE.TOUCH_PAN;

			break;

		default:

			state = STATE.NONE;
			}

		if (state !== STATE.NONE) {

			scope.dispatchEvent(startEvent);
		}
		}

	function onTouchMove(event) {

		if (scope.enabled === false)
			return;

		event.preventDefault();
		event.stopPropagation();

		switch (event.touches.length) {

		case 1: // one-fingered touch: rotate

			if (scope.enableRotate === false)
				return;
			if (state !== STATE.TOUCH_ROTATE)
				return; // is this needed?...

			handleTouchMoveRotate(event);

			break;

		case 2: // two-fingered touch: dolly

			if (scope.enableZoom === false)
				return;
			if (state !== STATE.TOUCH_DOLLY)
				return; // is this needed?...

			handleTouchMoveDolly(event);

			break;

		case 3: // three-fingered touch: pan

			if (scope.enablePan === false)
				return;
			if (state !== STATE.TOUCH_PAN)
				return; // is this needed?...

			handleTouchMovePan(event);

			break;

		default:

			state = STATE.NONE;
		}
		}

	function onTouchEnd(event) {

		if (scope.enabled === false)
			return;

		handleTouchEnd(event);

		scope.dispatchEvent(endEvent);

		state = STATE.NONE;
		}

	function onContextMenu(event) {

		if (scope.enabled === false)
			return;

		event.preventDefault();
	}

	//

	scope.domElement.addEventListener('contextmenu', onContextMenu, false);

	scope.domElement.addEventListener('mousedown', onMouseDown, false);
	scope.domElement.addEventListener('wheel', onMouseWheel, false);

	scope.domElement.addEventListener('touchstart', onTouchStart, false);
	scope.domElement.addEventListener('touchend', onTouchEnd, false);
	scope.domElement.addEventListener('touchmove', onTouchMove, false);

	window.addEventListener('keydown', onKeyDown, false);

	// force an update at start

	this.update();

};

THREE.OrbitControls.prototype = Object.create(THREE.EventDispatcher.prototype);
THREE.OrbitControls.prototype.constructor = THREE.OrbitControls;

Object.defineProperties(THREE.OrbitControls.prototype, {

	center : {

		get : function() {

			console.warn('THREE.OrbitControls: .center has been renamed to .target');
			return this.target;

		}

	},

	// backward compatibility

	noZoom : {

		get : function() {

			console.warn('THREE.OrbitControls: .noZoom has been deprecated. Use .enableZoom instead.');
			return !this.enableZoom;

		},

		set : function(value) {

			console.warn('THREE.OrbitControls: .noZoom has been deprecated. Use .enableZoom instead.');
			this.enableZoom = !value;

		}

	},

	noRotate : {

		get : function() {

			console.warn('THREE.OrbitControls: .noRotate has been deprecated. Use .enableRotate instead.');
			return !this.enableRotate;

		},

		set : function(value) {

			console.warn('THREE.OrbitControls: .noRotate has been deprecated. Use .enableRotate instead.');
			this.enableRotate = !value;

		}

	},

	noPan : {

		get : function() {

			console.warn('THREE.OrbitControls: .noPan has been deprecated. Use .enablePan instead.');
			return !this.enablePan;

		},

		set : function(value) {

			console.warn('THREE.OrbitControls: .noPan has been deprecated. Use .enablePan instead.');
			this.enablePan = !value;

		}

	},

	noKeys : {

		get : function() {

			console.warn('THREE.OrbitControls: .noKeys has been deprecated. Use .enableKeys instead.');
			return !this.enableKeys;

		},

		set : function(value) {

			console.warn('THREE.OrbitControls: .noKeys has been deprecated. Use .enableKeys instead.');
			this.enableKeys = !value;

		}

	},

	staticMoving : {

		get : function() {

			console.warn('THREE.OrbitControls: .staticMoving has been deprecated. Use .enableDamping instead.');
			return !this.enableDamping;

		},

		set : function(value) {

			console.warn('THREE.OrbitControls: .staticMoving has been deprecated. Use .enableDamping instead.');
			this.enableDamping = !value;

		}

	},

	dynamicDampingFactor : {

		get : function() {

			console.warn('THREE.OrbitControls: .dynamicDampingFactor has been renamed. Use .dampingFactor instead.');
			return this.dampingFactor;

		},

		set : function(value) {

			console.warn('THREE.OrbitControls: .dynamicDampingFactor has been renamed. Use .dampingFactor instead.');
			this.dampingFactor = value;

		}

	}

});