import {
	EventDispatcher,
	Quaternion,
	Vector3
} from '../../../build/three.module.js';

var FlyControls = function ( object, domElement ) {

	if ( domElement === undefined ) {

		console.warn( 'THREE.FlyControls: The second parameter "domElement" is now mandatory.' );
		domElement = document;

	}

	this.object = object;
	this.domElement = domElement;

	if ( domElement ) this.domElement.setAttribute( 'tabindex', - 1 );

	// API

	this.movementSpeed = 1.0;
	this.rollSpeed = 0.005;

	this.dragToLook = false;
	this.autoForward = false;

	// disable default target object behavior

	// internals

	var scope = this;
	var changeEvent = { type: 'change' };
	var EPS = 0.000001;

	this.tmpQuaternion = new Quaternion();

	this.mouseStatus = 0;

	this.moveState = { up: 0, down: 0, left: 0, right: 0, forward: 0, back: 0, pitchUp: 0, pitchDown: 0, yawLeft: 0, yawRight: 0, rollLeft: 0, rollRight: 0 };
	this.moveVector = new Vector3( 0, 0, 0 );
	this.rotationVector = new Vector3( 0, 0, 0 );

	this.keydown = function ( event ) {

		if ( event.altKey ) {

			return;

		}

		//event.preventDefault();

		switch ( event.code ) {

			case 'ShiftLeft':
			case 'ShiftRight': this.movementSpeedMultiplier = .1; break;

			case 'KeyW': this.moveState.forward = 1; break;
			case 'KeyS': this.moveState.back = 1; break;

			case 'KeyA': this.moveState.left = 1; break;
			case 'KeyD': this.moveState.right = 1; break;

			case 'KeyR': this.moveState.up = 1; break;
			case 'KeyF': this.moveState.down = 1; break;

			case 'ArrowUp': this.moveState.pitchUp = 1; break;
			case 'ArrowDown': this.moveState.pitchDown = 1; break;

			case 'ArrowLeft': this.moveState.yawLeft = 1; break;
			case 'ArrowRight': this.moveState.yawRight = 1; break;

			case 'KeyQ': this.moveState.rollLeft = 1; break;
			case 'KeyE': this.moveState.rollRight = 1; break;

		}

		this.updateMovementVector();
		this.updateRotationVector();

	};

	this.keyup = function ( event ) {

		switch ( event.code ) {

			case 'ShiftLeft':
			case 'ShiftRight': this.movementSpeedMultiplier = 1; break;

			case 'KeyW': this.moveState.forward = 0; break;
			case 'KeyS': this.moveState.back = 0; break;

			case 'KeyA': this.moveState.left = 0; break;
			case 'KeyD': this.moveState.right = 0; break;

			case 'KeyR': this.moveState.up = 0; break;
			case 'KeyF': this.moveState.down = 0; break;

			case 'ArrowUp': this.moveState.pitchUp = 0; break;
			case 'ArrowDown': this.moveState.pitchDown = 0; break;

			case 'ArrowLeft': this.moveState.yawLeft = 0; break;
			case 'ArrowRight': this.moveState.yawRight = 0; break;

			case 'KeyQ': this.moveState.rollLeft = 0; break;
			case 'KeyE': this.moveState.rollRight = 0; break;

		}

		this.updateMovementVector();
		this.updateRotationVector();

	};

	this.mousedown = function ( event ) {

		if ( this.domElement !== document ) {

			this.domElement.focus();

		}

		event.preventDefault();

		if ( this.dragToLook ) {

			this.mouseStatus ++;

		} else {

			switch ( event.button ) {

				case 0: this.moveState.forward = 1; break;
				case 2: this.moveState.back = 1; break;

			}

			this.updateMovementVector();

		}

	};

	this.mousemove = function ( event ) {

		if ( ! this.dragToLook || this.mouseStatus > 0 ) {

			var container = this.getContainerDimensions();
			var halfWidth = container.size[ 0 ] / 2;
			var halfHeight = container.size[ 1 ] / 2;

			this.moveState.yawLeft = - ( ( event.pageX - container.offset[ 0 ] ) - halfWidth ) / halfWidth;
			this.moveState.pitchDown = ( ( event.pageY - container.offset[ 1 ] ) - halfHeight ) / halfHeight;

			this.updateRotationVector();

		}

	};

	this.mouseup = function ( event ) {

		event.preventDefault();

		if ( this.dragToLook ) {

			this.mouseStatus --;

			this.moveState.yawLeft = this.moveState.pitchDown = 0;

		} else {

			switch ( event.button ) {

				case 0: this.moveState.forward = 0; break;
				case 2: this.moveState.back = 0; break;

			}

			this.updateMovementVector();

		}

		this.updateRotationVector();

	};

	this.update = function () {

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

		return function ( delta ) {

			var moveMult = delta * scope.movementSpeed;
			var rotMult = delta * scope.rollSpeed;

			scope.object.translateX( scope.moveVector.x * moveMult );
			scope.object.translateY( scope.moveVector.y * moveMult );
			scope.object.translateZ( scope.moveVector.z * moveMult );

			scope.tmpQuaternion.set( scope.rotationVector.x * rotMult, scope.rotationVector.y * rotMult, scope.rotationVector.z * rotMult, 1 ).normalize();
			scope.object.quaternion.multiply( scope.tmpQuaternion );

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

				scope.dispatchEvent( changeEvent );
				lastQuaternion.copy( scope.object.quaternion );
				lastPosition.copy( scope.object.position );

			}

		};

	}();

	this.updateMovementVector = function () {

		var forward = ( this.moveState.forward || ( this.autoForward && ! this.moveState.back ) ) ? 1 : 0;

		this.moveVector.x = ( - this.moveState.left + this.moveState.right );
		this.moveVector.y = ( - this.moveState.down + this.moveState.up );
		this.moveVector.z = ( - forward + this.moveState.back );

		//console.log( 'move:', [ this.moveVector.x, this.moveVector.y, this.moveVector.z ] );

	};

	this.updateRotationVector = function () {

		this.rotationVector.x = ( - this.moveState.pitchDown + this.moveState.pitchUp );
		this.rotationVector.y = ( - this.moveState.yawRight + this.moveState.yawLeft );
		this.rotationVector.z = ( - this.moveState.rollRight + this.moveState.rollLeft );

		//console.log( 'rotate:', [ this.rotationVector.x, this.rotationVector.y, this.rotationVector.z ] );

	};

	this.getContainerDimensions = function () {

		if ( this.domElement != document ) {

			return {
				size: [ this.domElement.offsetWidth, this.domElement.offsetHeight ],
				offset: [ this.domElement.offsetLeft, this.domElement.offsetTop ]
			};

		} else {

			return {
				size: [ window.innerWidth, window.innerHeight ],
				offset: [ 0, 0 ]
			};

		}

	};

	function bind( scope, fn ) {

		return function () {

			fn.apply( scope, arguments );

		};

	}

	function contextmenu( event ) {

		event.preventDefault();

	}

	this.dispose = function () {

		this.domElement.removeEventListener( 'contextmenu', contextmenu );
		this.domElement.removeEventListener( 'mousedown', _mousedown );
		this.domElement.removeEventListener( 'mousemove', _mousemove );
		this.domElement.removeEventListener( 'mouseup', _mouseup );

		window.removeEventListener( 'keydown', _keydown );
		window.removeEventListener( 'keyup', _keyup );

	};

	var _mousemove = bind( this, this.mousemove );
	var _mousedown = bind( this, this.mousedown );
	var _mouseup = bind( this, this.mouseup );
	var _keydown = bind( this, this.keydown );
	var _keyup = bind( this, this.keyup );

	this.domElement.addEventListener( 'contextmenu', contextmenu );

	this.domElement.addEventListener( 'mousemove', _mousemove );
	this.domElement.addEventListener( 'mousedown', _mousedown );
	this.domElement.addEventListener( 'mouseup', _mouseup );

	window.addEventListener( 'keydown', _keydown );
	window.addEventListener( 'keyup', _keyup );

	this.updateMovementVector();
	this.updateRotationVector();

};

FlyControls.prototype = Object.create( EventDispatcher.prototype );
FlyControls.prototype.constructor = FlyControls;

export { FlyControls };