// 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 left mouse + ctrl/meta/shiftKey, or arrow keys / touch: two-finger move

// Simplified and fixed version for GXS - QuantumNexus

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, the interval [min, max] must be a sub-interval of [- 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 = 0.05;

    // 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.panSpeed = 1.0;
    this.screenSpacePanning = true; // if false, pan orthogonal to world-space direction camera.up
    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 orbit 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 = { LEFT: THREE.MOUSE.ROTATE, MIDDLE: THREE.MOUSE.DOLLY, RIGHT: THREE.MOUSE.PAN };

    // Touch fingers
    this.touches = { ONE: THREE.TOUCH.ROTATE, TWO: THREE.TOUCH.DOLLY_PAN };

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

    // State variables
    this.changeEvent = { type: 'change' };
    this.startEvent = { type: 'start' };
    this.endEvent = { type: 'end' };

    this.STATE = {
        NONE: - 1,
        ROTATE: 0,
        DOLLY: 1,
        PAN: 2,
        TOUCH_ROTATE: 3,
        TOUCH_PAN: 4,
        TOUCH_DOLLY_PAN: 5,
        TOUCH_DOLLY_ROTATE: 6
    };

    var state = this.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();

    var scope = this;

    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) {
            if (scope.screenSpacePanning === true) {
                v.setFromMatrixColumn(objectMatrix, 1);
            } else {
                v.setFromMatrixColumn(objectMatrix, 0);
                v.crossVectors(scope.object.up, v);
            }
            v.multiplyScalar(distance);
            panOffset.add(v);
        };
    }();

    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;
        }
    }

    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;
        }
    }

    // event callbacks - update the object state

    function handleMouseDownRotate(event) {
        rotateStart.set(event.clientX, event.clientY);
    }

    function handleMouseDownDolly(event) {
        dollyStart.set(event.clientX, event.clientY);
    }

    function handleMouseDownPan(event) {
        panStart.set(event.clientX, event.clientY);
    }

    function handleMouseMoveRotate(event) {
        rotateEnd.set(event.clientX, event.clientY);
        rotateDelta.subVectors(rotateEnd, rotateStart).multiplyScalar(scope.rotateSpeed);

        var element = scope.domElement;

        rotateLeft(2 * Math.PI * rotateDelta.x / element.clientHeight); // yes, height
        rotateUp(2 * Math.PI * rotateDelta.y / element.clientHeight);

        rotateStart.copy(rotateEnd);
        scope.update();
    }

    function handleMouseMoveDolly(event) {
        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) {
        panEnd.set(event.clientX, event.clientY);
        panDelta.subVectors(panEnd, panStart).multiplyScalar(scope.panSpeed);

        pan(panDelta.x, panDelta.y);

        panStart.copy(panEnd);
        scope.update();
    }

    function handleMouseWheel(event) {
        if (event.deltaY < 0) {
            dollyOut(getZoomScale());
        } else if (event.deltaY > 0) {
            dollyIn(getZoomScale());
        }

        scope.update();
    }

    function handleKeyDown(event) {
        var needsUpdate = false;

        switch (event.keyCode) {
            case scope.keys.UP:
                pan(0, scope.keyPanSpeed);
                needsUpdate = true;
                break;

            case scope.keys.BOTTOM:
                pan(0, - scope.keyPanSpeed);
                needsUpdate = true;
                break;

            case scope.keys.LEFT:
                pan(scope.keyPanSpeed, 0);
                needsUpdate = true;
                break;

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

        if (needsUpdate) {
            event.preventDefault();
            scope.update();
        }
    }

    function handleTouchStartRotate(event) {
        if (event.touches.length === 1) {
            rotateStart.set(event.touches[0].pageX, event.touches[0].pageY);
        } else {
            var x = 0.5 * (event.touches[0].pageX + event.touches[1].pageX);
            var y = 0.5 * (event.touches[0].pageY + event.touches[1].pageY);
            rotateStart.set(x, y);
        }
    }

    function handleTouchStartPan(event) {
        if (event.touches.length === 1) {
            panStart.set(event.touches[0].pageX, event.touches[0].pageY);
        } else {
            var x = 0.5 * (event.touches[0].pageX + event.touches[1].pageX);
            var y = 0.5 * (event.touches[0].pageY + event.touches[1].pageY);
            panStart.set(x, y);
        }
    }

    function handleTouchStartDolly(event) {
        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 handleTouchStartDollyPan(event) {
        if (scope.enableZoom) handleTouchStartDolly(event);
        if (scope.enablePan) handleTouchStartPan(event);
    }

    function handleTouchStartDollyRotate(event) {
        if (scope.enableZoom) handleTouchStartDolly(event);
        if (scope.enableRotate) handleTouchStartRotate(event);
    }

    function handleTouchMoveRotate(event) {
        if (event.touches.length === 1) {
            rotateEnd.set(event.touches[0].pageX, event.touches[0].pageY);
        } else {
            var x = 0.5 * (event.touches[0].pageX + event.touches[1].pageX);
            var y = 0.5 * (event.touches[0].pageY + event.touches[1].pageY);
            rotateEnd.set(x, y);
        }

        rotateDelta.subVectors(rotateEnd, rotateStart).multiplyScalar(scope.rotateSpeed);

        var element = scope.domElement;
        rotateLeft(2 * Math.PI * rotateDelta.x / element.clientHeight); // yes, height
        rotateUp(2 * Math.PI * rotateDelta.y / element.clientHeight);

        rotateStart.copy(rotateEnd);
    }

    function handleTouchMovePan(event) {
        if (event.touches.length === 1) {
            panEnd.set(event.touches[0].pageX, event.touches[0].pageY);
        } else {
            var x = 0.5 * (event.touches[0].pageX + event.touches[1].pageX);
            var y = 0.5 * (event.touches[0].pageY + event.touches[1].pageY);
            panEnd.set(x, y);
        }

        panDelta.subVectors(panEnd, panStart).multiplyScalar(scope.panSpeed);
        pan(panDelta.x, panDelta.y);
        panStart.copy(panEnd);
    }

    function handleTouchMoveDolly(event) {
        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.set(0, Math.pow(dollyEnd.y / dollyStart.y, scope.zoomSpeed));
        dollyOut(dollyDelta.y);
        dollyStart.copy(dollyEnd);
    }

    function handleTouchMoveDollyPan(event) {
        if (scope.enableZoom) handleTouchMoveDolly(event);
        if (scope.enablePan) handleTouchMovePan(event);
    }

    function handleTouchMoveDollyRotate(event) {
        if (scope.enableZoom) handleTouchMoveDolly(event);
        if (scope.enableRotate) handleTouchMoveRotate(event);
    }

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

    function onMouseDown(event) {
        if (scope.enabled === false) return;
        event.preventDefault();

        switch (event.button) {
            case 0:
                if (scope.enableRotate === false) return;
                handleMouseDownRotate(event);
                state = scope.STATE.ROTATE;
                break;

            case 1:
                if (scope.enableZoom === false) return;
                handleMouseDownDolly(event);
                state = scope.STATE.DOLLY;
                break;

            case 2:
                if (scope.enablePan === false) return;
                handleMouseDownPan(event);
                state = scope.STATE.PAN;
                break;
        }

        if (state !== scope.STATE.NONE) {
            document.addEventListener('mousemove', onMouseMove, false);
            document.addEventListener('mouseup', onMouseUp, false);
            scope.dispatchEvent(scope.startEvent);
        }
    }

    function onMouseMove(event) {
        if (scope.enabled === false) return;
        event.preventDefault();

        switch (state) {
            case scope.STATE.ROTATE:
                if (scope.enableRotate === false) return;
                handleMouseMoveRotate(event);
                break;

            case scope.STATE.DOLLY:
                if (scope.enableZoom === false) return;
                handleMouseMoveDolly(event);
                break;

            case scope.STATE.PAN:
                if (scope.enablePan === false) return;
                handleMouseMovePan(event);
                break;
        }
    }

    function onMouseUp(event) {
        if (scope.enabled === false) return;

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

        scope.dispatchEvent(scope.endEvent);
        state = scope.STATE.NONE;
    }

    function onMouseWheel(event) {
        if (scope.enabled === false || scope.enableZoom === false || state !== scope.STATE.NONE) return;
        event.preventDefault();
        event.stopPropagation();

        scope.dispatchEvent(scope.startEvent);
        handleMouseWheel(event);
        scope.dispatchEvent(scope.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;
        event.preventDefault();

        switch (event.touches.length) {
            case 1:
                switch (scope.touches.ONE) {
                    case THREE.TOUCH.ROTATE:
                        if (scope.enableRotate === false) return;
                        handleTouchStartRotate(event);
                        state = scope.STATE.TOUCH_ROTATE;
                        break;

                    case THREE.TOUCH.PAN:
                        if (scope.enablePan === false) return;
                        handleTouchStartPan(event);
                        state = scope.STATE.TOUCH_PAN;
                        break;

                    default:
                        state = scope.STATE.NONE;
                }
                break;

            case 2:
                switch (scope.touches.TWO) {
                    case THREE.TOUCH.DOLLY_PAN:
                        if (scope.enableZoom === false && scope.enablePan === false) return;
                        handleTouchStartDollyPan(event);
                        state = scope.STATE.TOUCH_DOLLY_PAN;
                        break;

                    case THREE.TOUCH.DOLLY_ROTATE:
                        if (scope.enableZoom === false && scope.enableRotate === false) return;
                        handleTouchStartDollyRotate(event);
                        state = scope.STATE.TOUCH_DOLLY_ROTATE;
                        break;

                    default:
                        state = scope.STATE.NONE;
                }
                break;

            default:
                state = scope.STATE.NONE;
        }

        if (state !== scope.STATE.NONE) {
            scope.dispatchEvent(scope.startEvent);
        }
    }

    function onTouchMove(event) {
        if (scope.enabled === false) return;
        event.preventDefault();
        event.stopPropagation();

        switch (state) {
            case scope.STATE.TOUCH_ROTATE:
                if (scope.enableRotate === false) return;
                handleTouchMoveRotate(event);
                scope.update();
                break;

            case scope.STATE.TOUCH_PAN:
                if (scope.enablePan === false) return;
                handleTouchMovePan(event);
                scope.update();
                break;

            case scope.STATE.TOUCH_DOLLY_PAN:
                if (scope.enableZoom === false && scope.enablePan === false) return;
                handleTouchMoveDollyPan(event);
                scope.update();
                break;

            case scope.STATE.TOUCH_DOLLY_ROTATE:
                if (scope.enableZoom === false && scope.enableRotate === false) return;
                handleTouchMoveDollyRotate(event);
                scope.update();
                break;

            default:
                state = scope.STATE.NONE;
        }
    }

    function onTouchEnd(event) {
        if (scope.enabled === false) return;
        scope.dispatchEvent(scope.endEvent);
        state = scope.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 = 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 === scope.STATE.NONE) {
                rotateLeft(getAutoRotationAngle());
            }

            if (scope.enableDamping) {
                spherical.theta += sphericalDelta.theta * scope.dampingFactor;
                spherical.phi += sphericalDelta.phi * scope.dampingFactor;
            } else {
                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
            if (scope.enableDamping === true) {
                scope.target.addScaledVector(panOffset, scope.dampingFactor);
            } else {
                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);
                panOffset.multiplyScalar(1 - scope.dampingFactor);
            } else {
                sphericalDelta.set(0, 0, 0);
                panOffset.set(0, 0, 0);
            }

            scale = 1;

            // 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(scope.changeEvent);
                lastPosition.copy(scope.object.position);
                lastQuaternion.copy(scope.object.quaternion);
                zoomChanged = false;
                return true;
            }

            return false;
        };
    }();

    function pan(deltaX, deltaY) {
        var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

        if (scope.object.isPerspectiveCamera) {
            // perspective
            var position = scope.object.position;
            var offset = position.clone().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 use only clientHeight here so aspect ratio does not distort speed
            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;
        }
    };

    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);
    };
};

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

// This ensures backward compatibility with older THREE.js versions
if (typeof THREE.MOUSE === 'undefined') {
    THREE.MOUSE = { LEFT: 0, MIDDLE: 1, RIGHT: 2 };
}

if (typeof THREE.TOUCH === 'undefined') {
    THREE.TOUCH = { ROTATE: 0, PAN: 1, DOLLY_PAN: 2, DOLLY_ROTATE: 3 };
}