import {
  Vector3,
  MOUSE,
  Quaternion,
  Spherical,
  Vector2,
  EventDispatcher,
} from "three";

/**
 * @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
 */

class OrbitControls extends EventDispatcher {
  constructor(object, domElement) {
    super();

    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 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 = false;
    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 = false;
    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: MOUSE.LEFT,
      ZOOM: MOUSE.MIDDLE,
      PAN: MOUSE.RIGHT,
    };

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

    //
    // public methods
    //

    this.getPolarAngle = () => spherical.phi;

    this.getAzimuthalAngle = () => spherical.theta;

    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 Vector3();

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

      var lastPosition = new Vector3();
      var lastQuaternion = new 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 Spherical();
    var sphericalDelta = new Spherical();

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

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

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

    var dollyStart = new Vector2();
    var dollyEnd = new Vector2();
    var dollyDelta = new 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 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 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 Vector3();

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

        if (Object.getPrototypeOf(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 (Object.getPrototypeOf(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 (Object.getPrototypeOf(scope.object).isPerspectiveCamera) {
        scale /= dollyScale;
      } else if (Object.getPrototypeOf(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 (Object.getPrototypeOf(scope.object).isPerspectiveCamera) {
        scale *= dollyScale;
      } else if (Object.getPrototypeOf(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 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();
    }

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

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

      event.preventDefault();

      if (event.button === scope.mouseButtons.ORBIT) {
        if (scope.enableRotate === false) return;

        handleMouseDownRotate(event);

        state = STATE.ROTATE;
      } else if (event.button === scope.mouseButtons.ZOOM) {
        if (scope.enableZoom === false) return;

        handleMouseDownDolly(event);

        state = STATE.DOLLY;
      } else if (event.button === scope.mouseButtons.PAN) {
        if (scope.enablePan === false) return;

        handleMouseDownPan(event);

        state = STATE.PAN;
      }

      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();

      if (state === STATE.ROTATE) {
        if (scope.enableRotate === false) return;

        handleMouseMoveRotate(event);
      } else if (state === STATE.DOLLY) {
        if (scope.enableZoom === false) return;

        handleMouseMoveDolly(event);
      } else if (state === STATE.PAN) {
        if (scope.enablePan === false) return;

        handleMouseMovePan(event);
      }
    }

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

      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();

      handleMouseWheel(event);

      scope.dispatchEvent(startEvent); // not sure why these are here...
      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;

      scope.dispatchEvent(endEvent);

      state = STATE.NONE;
    }

    function onContextMenu(event) {
      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();
  }

  get center() {
    console.warn("OrbitControls: .center has been renamed to .target");
    return this.target;
  }

  // backward compatibility

  get noZoom() {
    console.warn(
      "OrbitControls: .noZoom has been deprecated. Use .enableZoom instead."
    );
    return !this.enableZoom;
  }

  set noZoom(value) {
    console.warn(
      "OrbitControls: .noZoom has been deprecated. Use .enableZoom instead."
    );
    this.enableZoom = !value;
  }

  get noRotate() {
    console.warn(
      "OrbitControls: .noRotate has been deprecated. Use .enableRotate instead."
    );
    return !this.enableRotate;
  }

  set noRotate(value) {
    console.warn(
      "OrbitControls: .noRotate has been deprecated. Use .enableRotate instead."
    );
    this.enableRotate = !value;
  }

  get noPan() {
    console.warn(
      "OrbitControls: .noPan has been deprecated. Use .enablePan instead."
    );
    return !this.enablePan;
  }

  set noPan(value) {
    console.warn(
      "OrbitControls: .noPan has been deprecated. Use .enablePan instead."
    );
    this.enablePan = !value;
  }

  get noKeys() {
    console.warn(
      "OrbitControls: .noKeys has been deprecated. Use .enableKeys instead."
    );
    return !this.enableKeys;
  }

  set noKeys(value) {
    console.warn(
      "OrbitControls: .noKeys has been deprecated. Use .enableKeys instead."
    );
    this.enableKeys = !value;
  }

  get staticMoving() {
    console.warn(
      "OrbitControls: .staticMoving has been deprecated. Use .enableDamping instead."
    );
    return !this.enableDamping;
  }

  set staticMoving(value) {
    console.warn(
      "OrbitControls: .staticMoving has been deprecated. Use .enableDamping instead."
    );
    this.enableDamping = !value;
  }

  get dynamicDampingFactor() {
    console.warn(
      "OrbitControls: .dynamicDampingFactor has been renamed. Use .dampingFactor instead."
    );
    return this.dampingFactor;
  }

  set dynamicDampingFactor(value) {
    console.warn(
      "OrbitControls: .dynamicDampingFactor has been renamed. Use .dampingFactor instead."
    );
    this.dampingFactor = value;
  }
}

export default OrbitControls;