// FIXME recheck layer/map projection compatability when projection changes
// FIXME layer renderers should skip when they can't reproject
// FIXME add tilt and height?

goog.provide('ol.Map');
goog.provide('ol.MapEventType');
goog.provide('ol.MapProperty');

goog.require('goog.array');
goog.require('goog.debug.Logger');
goog.require('goog.dispose');
goog.require('goog.dom');
goog.require('goog.dom.ViewportSizeMonitor');
goog.require('goog.events');
goog.require('goog.events.BrowserEvent');
goog.require('goog.events.Event');
goog.require('goog.events.EventType');
goog.require('goog.events.KeyHandler');
goog.require('goog.events.KeyHandler.EventType');
goog.require('goog.events.MouseWheelEvent');
goog.require('goog.events.MouseWheelHandler');
goog.require('goog.events.MouseWheelHandler.EventType');
goog.require('goog.functions');
goog.require('goog.fx.anim');
goog.require('goog.fx.anim.Animated');
goog.require('goog.object');
goog.require('ol.Collection');
goog.require('ol.Color');
goog.require('ol.Constraints');
goog.require('ol.Coordinate');
goog.require('ol.Extent');
goog.require('ol.MapBrowserEvent');
goog.require('ol.Object');
goog.require('ol.Pixel');
goog.require('ol.Projection');
goog.require('ol.Size');
goog.require('ol.TransformFunction');
goog.require('ol.interaction.Interaction');
goog.require('ol.renderer.Layer');


/**
 * @enum {string}
 */
ol.MapEventType = {
  POST_RENDER: 'postrender'
};


/**
 * @enum {string}
 */
ol.MapProperty = {
  BACKGROUND_COLOR: 'backgroundColor',
  CENTER: 'center',
  INTERACTIONS: 'interactions',
  LAYERS: 'layers',
  PROJECTION: 'projection',
  RESOLUTION: 'resolution',
  ROTATION: 'rotation',
  SIZE: 'size',
  USER_PROJECTION: 'userProjection'
};


/**
 * @enum {number}
 */
ol.MapPaneZIndex = {
  VIEWPORT: 1000
};



/**
 * @constructor
 * @extends {ol.Object}
 * @implements {goog.fx.anim.Animated}
 * @param {Element} container Container.
 * @param {ol.MapOptionsLiteral} mapOptionsLiteral Map options literal.
 */
ol.Map = function(container, mapOptionsLiteral) {

  goog.base(this);

  if (goog.DEBUG) {
    /**
     * @protected
     * @type {goog.debug.Logger}
     */
    this.logger = goog.debug.Logger.getLogger('ol.map.' + goog.getUid(this));
  }

  var mapOptions = ol.MapOptions.create(mapOptionsLiteral);

  /**
   * @type {ol.TransformFunction}
   * @private
   */
  this.userToMapTransform_ = ol.Projection.identityTransform;

  /**
   * @type {ol.TransformFunction}
   * @private
   */
  this.mapToUserTransform_ = ol.Projection.cloneTransform;

  /**
   * @private
   * @type {boolean}
   */
  this.animatedRenderer_ = false;

  /**
   * @private
   * @type {number}
   */
  this.animatingCount_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.freezeRenderingCount_ = 0;

  /**
   * @private
   * @type {boolean}
   */
  this.dirty_ = false;

  /**
   * @private
   * @type {Element}
   */
  this.container_ = container;

  /**
   * @private
   * @type {ol.Constraints}
   */
  this.constraints_ = mapOptions.constraints;

  /**
   * @private
   * @type {Element}
   */
  this.viewport_ = goog.dom.createElement(goog.dom.TagName.DIV);
  this.viewport_.className = 'ol-viewport';
  this.viewport_.style.position = 'relative';
  this.viewport_.style.overflow = 'hidden';
  this.viewport_.style.width = '100%';
  this.viewport_.style.height = '100%';
  this.viewport_.style.zIndex = ol.MapPaneZIndex.VIEWPORT;
  goog.dom.appendChild(container, this.viewport_);

  var mapBrowserEventHandler = new ol.MapBrowserEventHandler(this);
  goog.events.listen(mapBrowserEventHandler, [
    ol.MapBrowserEvent.EventType.CLICK,
    ol.MapBrowserEvent.EventType.DBLCLICK,
    ol.MapBrowserEvent.EventType.DRAGSTART,
    ol.MapBrowserEvent.EventType.DRAG,
    ol.MapBrowserEvent.EventType.DRAGEND
  ], this.handleMapBrowserEvent, false, this);
  this.registerDisposable(mapBrowserEventHandler);

  // FIXME we probably shouldn't listen on document...
  var keyHandler = new goog.events.KeyHandler(document);
  goog.events.listen(keyHandler, goog.events.KeyHandler.EventType.KEY,
      this.handleBrowserEvent, false, this);
  this.registerDisposable(keyHandler);

  var mouseWheelHandler = new goog.events.MouseWheelHandler(this.viewport_);
  goog.events.listen(mouseWheelHandler,
      goog.events.MouseWheelHandler.EventType.MOUSEWHEEL,
      this.handleBrowserEvent, false, this);
  this.registerDisposable(mouseWheelHandler);

  /**
   * @type {ol.renderer.Map}
   * @private
   */
  this.renderer_ = new mapOptions.rendererConstructor(this.viewport_, this);
  this.registerDisposable(this.renderer_);

  /**
   * @private
   */
  this.viewportSizeMonitor_ = new goog.dom.ViewportSizeMonitor();

  goog.events.listen(this.viewportSizeMonitor_, goog.events.EventType.RESIZE,
      this.handleBrowserWindowResize, false, this);

  goog.events.listen(
      this, ol.Object.getChangedEventType(ol.MapProperty.PROJECTION),
      this.handleProjectionChanged, false, this);

  goog.events.listen(
      this, ol.Object.getChangedEventType(ol.MapProperty.USER_PROJECTION),
      this.handleUserProjectionChanged, false, this);

  this.setValues(mapOptions.values);

  this.handleBrowserWindowResize();

};
goog.inherits(ol.Map, ol.Object);


/**
 * @return {boolean} Can rotate.
 */
ol.Map.prototype.canRotate = function() {
  return this.renderer_.canRotate();
};


/**
 * @param {ol.Extent} extent Extent.
 */
ol.Map.prototype.fitExtent = function(extent) {
  this.withFrozenRendering(function() {
    this.setCenter(extent.getCenter());
    var resolution = this.getResolutionForExtent(extent);
    resolution = this.constraints_.resolution(resolution, 0);
    this.setResolution(resolution);
    if (this.canRotate()) {
      this.setRotation(0);
    }
  }, this);
};


/**
 * @param {ol.Extent} userExtent Extent in user projection.
 */
ol.Map.prototype.fitUserExtent = function(userExtent) {
  this.fitExtent(userExtent.transform(this.userToMapTransform_));
};


/**
 * Freeze rendering.
 */
ol.Map.prototype.freezeRendering = function() {
  ++this.freezeRenderingCount_;
};


/**
 * @return {ol.Color|undefined} Background color.
 */
ol.Map.prototype.getBackgroundColor = function() {
  return /** @type {ol.Color|undefined} */ (
      this.get(ol.MapProperty.BACKGROUND_COLOR));
};
goog.exportProperty(
    ol.Map.prototype,
    'getBackgroundColor',
    ol.Map.prototype.getBackgroundColor);


/**
 * @return {ol.Coordinate|undefined} Center.
 */
ol.Map.prototype.getCenter = function() {
  return /** @type {ol.Coordinate} */ this.get(ol.MapProperty.CENTER);
};
goog.exportProperty(
    ol.Map.prototype,
    'getCenter',
    ol.Map.prototype.getCenter);


/**
 * @return {Element} Container.
 */
ol.Map.prototype.getContainer = function() {
  return this.container_;
};


/**
 * @param {ol.Pixel} pixel Pixel.
 * @return {ol.Coordinate|undefined} Coordinate.
 */
ol.Map.prototype.getCoordinateFromPixel = function(pixel) {
  if (this.isDef()) {
    return this.renderer_.getCoordinateFromPixel(pixel);
  } else {
    return undefined;
  }
};


/**
 * @return {ol.Extent|undefined} Extent.
 */
ol.Map.prototype.getExtent = function() {
  if (this.isDef()) {
    var center = this.getCenter();
    var resolution = this.getResolution();
    var size = this.getSize();
    var minX = center.x - resolution * size.width / 2;
    var minY = center.y - resolution * size.height / 2;
    var maxX = center.x + resolution * size.width / 2;
    var maxY = center.y + resolution * size.height / 2;
    return new ol.Extent(minX, minY, maxX, maxY);
  } else {
    return undefined;
  }
};


/**
 * @return {ol.Collection} Interactions.
 */
ol.Map.prototype.getInteractions = function() {
  return /** @type {ol.Collection} */ this.get(ol.MapProperty.INTERACTIONS);
};
goog.exportProperty(
    ol.Map.prototype,
    'getInteractions',
    ol.Map.prototype.getInteractions);


/**
 * @return {ol.Collection} Layers.
 */
ol.Map.prototype.getLayers = function() {
  return /** @type {ol.Collection} */ (this.get(ol.MapProperty.LAYERS));
};


/**
 * @param {ol.Coordinate} coordinate Coordinate.
 * @return {ol.Pixel|undefined} Pixel.
 */
ol.Map.prototype.getPixelFromCoordinate = function(coordinate) {
  if (this.isDef()) {
    return this.renderer_.getPixelFromCoordinate(coordinate);
  } else {
    return undefined;
  }
};


/**
 * @return {ol.Projection|undefined} Projection.
 */
ol.Map.prototype.getProjection = function() {
  return /** @type {ol.Projection} */ this.get(ol.MapProperty.PROJECTION);
};
goog.exportProperty(
    ol.Map.prototype,
    'getProjection',
    ol.Map.prototype.getProjection);


/**
 * @return {number|undefined} Resolution.
 */
ol.Map.prototype.getResolution = function() {
  return /** @type {number} */ this.get(ol.MapProperty.RESOLUTION);
};
goog.exportProperty(
    ol.Map.prototype,
    'getResolution',
    ol.Map.prototype.getResolution);


/**
 * @param {ol.Extent} extent Extent.
 * @return {number|undefined} Resolution.
 */
ol.Map.prototype.getResolutionForExtent = function(extent) {
  var size = this.getSize();
  if (goog.isDef(size)) {
    var xResolution = (extent.maxX - extent.minX) / size.width;
    var yResolution = (extent.maxY - extent.minY) / size.height;
    return Math.max(xResolution, yResolution);
  } else {
    return undefined;
  }
};


/**
 * @return {ol.Extent} Rotated extent.
 */
ol.Map.prototype.getRotatedExtent = function() {
  goog.asserts.assert(this.isDef());
  var center = /** @type {!ol.Coordinate} */ this.getCenter();
  var resolution = this.getResolution();
  var rotation = this.getRotation() || 0;
  var size = this.getSize();
  var xScale = resolution * size.width / 2;
  var yScale = resolution * size.height / 2;
  var corners = [
    new ol.Coordinate(-xScale, -yScale),
    new ol.Coordinate(-xScale, yScale),
    new ol.Coordinate(xScale, -yScale),
    new ol.Coordinate(xScale, yScale)
  ];
  goog.array.forEach(corners, function(corner) {
    corner.rotate(rotation);
    corner.add(center);
  });
  return ol.Extent.boundingExtent.apply(null, corners);
};


/**
 * @return {number|undefined} Rotation.
 */
ol.Map.prototype.getRotation = function() {
  return /** @type {number|undefined} */ this.get(ol.MapProperty.ROTATION);
};
goog.exportProperty(
    ol.Map.prototype,
    'getRotation',
    ol.Map.prototype.getRotation);


/**
 * @return {ol.Size|undefined} Size.
 */
ol.Map.prototype.getSize = function() {
  return /** @type {ol.Size|undefined} */ this.get(ol.MapProperty.SIZE);
};
goog.exportProperty(
    ol.Map.prototype,
    'getSize',
    ol.Map.prototype.getSize);


/**
 * @return {ol.Coordinate|undefined} Center in user projection.
 */
ol.Map.prototype.getUserCenter = function() {
  var center = this.getCenter();
  if (goog.isDef(center)) {
    return this.mapToUserTransform_(center);
  } else {
    return undefined;
  }
};


/**
 * @return {ol.Extent|undefined} Extent in user projection.
 */
ol.Map.prototype.getUserExtent = function() {
  var extent = this.getExtent();
  if (goog.isDef(extent)) {
    return extent.transform(this.mapToUserTransform_);
  } else {
    return undefined;
  }
};


/**
 * @return {ol.Projection|undefined} Projection.
 */
ol.Map.prototype.getUserProjection = function() {
  return /** @type {ol.Projection} */ this.get(
      ol.MapProperty.USER_PROJECTION);
};
goog.exportProperty(
    ol.Map.prototype,
    'getUserProjection',
    ol.Map.prototype.getUserProjection);


/**
 * @return {Element} Viewport.
 */
ol.Map.prototype.getViewport = function() {
  return this.viewport_;
};


/**
 * @param {goog.events.BrowserEvent} browserEvent Browser event.
 * @param {string=} opt_type Type.
 */
ol.Map.prototype.handleBrowserEvent = function(browserEvent, opt_type) {
  var type = opt_type || browserEvent.type;
  var mapBrowserEvent = new ol.MapBrowserEvent(type, this, browserEvent);
  this.handleMapBrowserEvent(mapBrowserEvent);
};


/**
 * @param {ol.MapBrowserEvent} mapBrowserEvent The event to handle.
 */
ol.Map.prototype.handleMapBrowserEvent = function(mapBrowserEvent) {
  var interactions = this.getInteractions();
  var interactionsArray = /** @type {Array.<ol.interaction.Interaction>} */
      interactions.getArray();
  if (this.dispatchEvent(mapBrowserEvent) !== false) {
    goog.array.every(interactionsArray, function(interaction) {
      interaction.handleMapBrowserEvent(mapBrowserEvent);
      return !mapBrowserEvent.defaultPrevented;
    });
  }
};


/**
 * @protected
 */
ol.Map.prototype.handleProjectionChanged = function() {
  this.recalculateTransforms_();
};


/**
 * @protected
 */
ol.Map.prototype.handleUserProjectionChanged = function() {
  this.recalculateTransforms_();
};


/**
 * @protected
 */
ol.Map.prototype.handleBrowserWindowResize = function() {
  var size = new ol.Size(this.container_.clientWidth,
      this.container_.clientHeight);
  this.setSize(size);
};


/**
 * @return {boolean} Is animating.
 */
ol.Map.prototype.isAnimating = function() {
  return this.animatingCount_ > 0;
};


/**
 * @return {boolean} Is defined.
 */
ol.Map.prototype.isDef = function() {
  return goog.isDefAndNotNull(this.getCenter()) &&
      goog.isDef(this.getResolution()) &&
      goog.isDefAndNotNull(this.getSize());
};


/**
 * @inheritDoc
 */
ol.Map.prototype.onAnimationFrame = function() {
  if (goog.DEBUG) {
    this.logger.info('onAnimationFrame');
  }
  this.renderFrame_();
};


/**
 * @private
 */
ol.Map.prototype.recalculateTransforms_ = function() {
  var projection = this.getProjection();
  var userProjection = this.getUserProjection();
  if (goog.isDefAndNotNull(projection) &&
      goog.isDefAndNotNull(userProjection)) {
    this.mapToUserTransform_ = ol.Projection.getTransform(
        projection, userProjection);
    this.userToMapTransform_ = ol.Projection.getTransform(
        userProjection, projection);
  } else {
    this.mapToUserTransform_ = ol.Projection.cloneTransform;
    this.userToMapTransform_ = ol.Projection.identityTransform;
  }
};


/**
 * Render.
 */
ol.Map.prototype.render = function() {
  if (this.animatingCount_ < 1) {
    if (this.freezeRenderingCount_ === 0) {
      this.renderFrame_();
    } else {
      this.dirty_ = true;
    }
  }
};


/**
 * @private
 */
ol.Map.prototype.renderFrame_ = function() {
  if (goog.DEBUG) {
    this.logger.info('renderFrame_');
  }
  var animatedRenderer = this.renderer_.render();
  this.dirty_ = false;
  if (animatedRenderer != this.animatedRenderer_) {
    if (animatedRenderer) {
      this.startAnimating();
    } else {
      this.stopAnimating();
    }
    this.animatedRenderer_ = animatedRenderer;
  }
  if (goog.DEBUG) {
    this.logger.info('postrender');
  }
  this.dispatchEvent(ol.MapEventType.POST_RENDER);
};


/**
 * @param {number|undefined} rotation Rotation.
 * @param {number} delta Delta.
 */
ol.Map.prototype.rotate = function(rotation, delta) {
  rotation = this.constraints_.rotation(rotation, delta);
  this.setRotation(rotation);
};


/**
 * @param {ol.Color} backgroundColor Background color.
 */
ol.Map.prototype.setBackgroundColor = function(backgroundColor) {
  this.set(ol.MapProperty.BACKGROUND_COLOR, backgroundColor);
};
goog.exportProperty(
    ol.Map.prototype,
    'setBackgroundColor',
    ol.Map.prototype.setBackgroundColor);


/**
 * @param {ol.Coordinate|undefined} center Center.
 */
ol.Map.prototype.setCenter = function(center) {
  this.set(ol.MapProperty.CENTER, center);
};
goog.exportProperty(
    ol.Map.prototype,
    'setCenter',
    ol.Map.prototype.setCenter);


/**
 * @param {ol.Collection} interactions Interactions.
 */
ol.Map.prototype.setInteractions = function(interactions) {
  this.set(ol.MapProperty.INTERACTIONS, interactions);
};
goog.exportProperty(
    ol.Map.prototype,
    'setInteractions',
    ol.Map.prototype.setInteractions);


/**
 * @param {ol.Collection} layers Layers.
 */
ol.Map.prototype.setLayers = function(layers) {
  this.set(ol.MapProperty.LAYERS, layers);
};
goog.exportProperty(
    ol.Map.prototype,
    'setLayers',
    ol.Map.prototype.setLayers);


/**
 * @param {ol.Projection} projection Projection.
 */
ol.Map.prototype.setProjection = function(projection) {
  this.set(ol.MapProperty.PROJECTION, projection);
};
goog.exportProperty(
    ol.Map.prototype,
    'setProjection',
    ol.Map.prototype.setProjection);


/**
 * @param {number|undefined} resolution Resolution.
 */
ol.Map.prototype.setResolution = function(resolution) {
  this.set(ol.MapProperty.RESOLUTION, resolution);
};
goog.exportProperty(
    ol.Map.prototype,
    'setResolution',
    ol.Map.prototype.setResolution);


/**
 * @param {number|undefined} rotation Rotation.
 */
ol.Map.prototype.setRotation = function(rotation) {
  this.set(ol.MapProperty.ROTATION, rotation);
};
goog.exportProperty(
    ol.Map.prototype,
    'setRotation',
    ol.Map.prototype.setRotation);


/**
 * @param {ol.Size} size Size.
 */
ol.Map.prototype.setSize = function(size) {
  var currentSize = this.getSize();
  if (!goog.isDef(currentSize) || !currentSize.equals(size)) {
    this.set(ol.MapProperty.SIZE, size);
  }
};
goog.exportProperty(
    ol.Map.prototype,
    'setSize',
    ol.Map.prototype.setSize);


/**
 * @param {ol.Coordinate} userCenter Center in user projection.
 */
ol.Map.prototype.setUserCenter = function(userCenter) {
  this.setCenter(this.userToMapTransform_(userCenter));
};
goog.exportProperty(
    ol.Map.prototype,
    'setUserCenter',
    ol.Map.prototype.setUserCenter);


/**
 * @param {ol.Projection} userProjection User projection.
 */
ol.Map.prototype.setUserProjection = function(userProjection) {
  this.set(ol.MapProperty.USER_PROJECTION, userProjection);
};
goog.exportProperty(
    ol.Map.prototype,
    'setUserProjection',
    ol.Map.prototype.setUserProjection);


/**
 * Start animating.
 */
ol.Map.prototype.startAnimating = function() {
  if (++this.animatingCount_ == 1) {
    if (goog.DEBUG) {
      this.logger.info('startAnimating');
    }
    goog.fx.anim.registerAnimation(this);
  }
};


/**
 * Stop animating.
 */
ol.Map.prototype.stopAnimating = function() {
  goog.asserts.assert(this.animatingCount_ > 0);
  if (--this.animatingCount_ === 0) {
    if (goog.DEBUG) {
      this.logger.info('stopAnimating');
    }
    goog.fx.anim.unregisterAnimation(this);
  }
};


/**
 * Unfreeze rendering.
 */
ol.Map.prototype.unfreezeRendering = function() {
  goog.asserts.assert(this.freezeRenderingCount_ > 0);
  if (--this.freezeRenderingCount_ === 0 &&
      this.animatingCount_ < 1 &&
      this.dirty_) {
    this.renderFrame_();
  }
};


/**
 * @param {function(this: T)} f Function.
 * @param {T=} opt_obj Object.
 * @template T
 */
ol.Map.prototype.withFrozenRendering = function(f, opt_obj) {
  this.freezeRendering();
  try {
    f.call(opt_obj);
  } finally {
    this.unfreezeRendering();
  }
};


/**
 * @private
 * @param {number|undefined} resolution Resolution to go to.
 * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
 */
ol.Map.prototype.zoom_ = function(resolution, opt_anchor) {
  if (goog.isDefAndNotNull(resolution) && goog.isDefAndNotNull(opt_anchor)) {
    var anchor = opt_anchor;
    var oldCenter = /** @type {!ol.Coordinate} */ this.getCenter();
    var oldResolution = this.getResolution();
    var x = anchor.x - resolution * (anchor.x - oldCenter.x) / oldResolution;
    var y = anchor.y - resolution * (anchor.y - oldCenter.y) / oldResolution;
    var center = new ol.Coordinate(x, y);
    this.withFrozenRendering(function() {
      this.setCenter(center);
      this.setResolution(resolution);
    }, this);
  } else {
    this.setResolution(resolution);
  }
};


/**
 * @param {number} delta Delta from previous zoom level.
 * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
 */
ol.Map.prototype.zoom = function(delta, opt_anchor) {
  var resolution = this.constraints_.resolution(this.getResolution(), delta);
  this.zoom_(resolution, opt_anchor);
};


/**
 * @param {number|undefined} resolution Resolution to go to.
 * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
 */
ol.Map.prototype.zoomToResolution = function(resolution, opt_anchor) {
  resolution = this.constraints_.resolution(resolution, 0);
  this.zoom_(resolution, opt_anchor);
};