L.Control.Dialog = L.Control.extend({
  options: {
    size: [ 300, 300 ],
    minSize: [ 100, 100 ],
    maxSize: [ 350, 350 ],
    anchor: [ 250, 250 ],
    position: "topleft",
    initOpen: true
  },

  initialize: function(options) {
    this.options = JSON.parse(JSON.stringify(this.options));
    L.setOptions(this, options);

    this._attributions = {};
  },

  onAdd: function(map) {
    this._initLayout();
    this._map = map;

    this.update();

    if (!this.options.initOpen) {
      this.close();
    }

    return this._container;
  },

  open: function() {
    if (!this._map) {
      return;
    }
    this._container.style.visibility = "";

    this._map.fire("dialog:opened", this);

    return this;
  },

  close: function() {
    this._container.style.visibility = "hidden";

    this._map.fire("dialog:closed", this);
    return this;
  },

  destroy: function() {
    if (!this._map) {
      return this;
    }

    this._map.fire("dialog:destroyed", this);
    this.remove();

    if (this.onRemove) {
      this.onRemove(this._map);
    }

    return this;
  },

  setLocation: function(location) {
    location = location || [ 250, 250 ];

    this.options.anchor[0] = 0;
    this.options.anchor[1] = 0;
    this._oldMousePos.x = 0;
    this._oldMousePos.y = 0;

    this._move(location[1], location[0]);

    return this;
  },

  setSize: function(size) {
    size = size || [ 300, 300 ];

    this.options.size[0] = 0;
    this.options.size[1] = 0;
    this._oldMousePos.x = 0;
    this._oldMousePos.y = 0;

    this._resize(size[0], size[1]);

    return this;
  },

  lock: function() {
    this._resizerNode.style.visibility = "hidden";
    this._grabberNode.style.visibility = "hidden";
    this._closeNode.style.visibility = "hidden";

    this._map.fire("dialog:locked", this);
    return this;
  },

  unlock: function() {
    this._resizerNode.style.visibility = "";
    this._grabberNode.style.visibility = "";
    this._closeNode.style.visibility = "";

    this._map.fire("dialog:unlocked", this);
    return this;
  },

  freeze: function() {
    this._resizerNode.style.visibility = "hidden";
    this._grabberNode.style.visibility = "hidden";

    this._map.fire("dialog:frozen", this);
    return this;
  },

  unfreeze: function() {
    this._resizerNode.style.visibility = "";
    this._grabberNode.style.visibility = "";

    this._map.fire("dialog:unfrozen", this);
    return this;
  },

  hideClose: function() {
    this._closeNode.style.visibility = "hidden";

    this._map.fire("dialog:closehidden", this);
    return this;
  },

  showClose: function() {
    this._closeNode.style.visibility = "";

    this._map.fire("dialog:closeshown", this);
    return this;
  },

  hideResize: function() {
    this._resizerNode.style.visibility = "hidden";

    this._map.fire("dialog:resizehidden", this);
    return this;
  },

  showResize: function() {
    this._resizerNode.style.visibility = "";

    this._map.fire("dialog:resizeshown", this);
    return this;
  },

  setContent: function(content) {
    this._content = content;
    this.update();
    return this;
  },

  getContent: function() {
    return this._content;
  },

  getElement: function() {
    return this._container;
  },

  update: function() {
    if (!this._map) {
      return;
    }

    this._container.style.visibility = "hidden";

    this._updateContent();
    this._updateLayout();

    this._container.style.visibility = "";
    this._map.fire("dialog:updated", this);
  },

  _initLayout: function() {
    var className = "leaflet-control-dialog",
      container = (this._container = L.DomUtil.create("div", className));

    container.style.width = this.options.size[0] + "px";
    container.style.height = this.options.size[1] + "px";

    container.style.top = this.options.anchor[0] + "px";
    container.style.left = this.options.anchor[1] + "px";

    var stop = L.DomEvent.stopPropagation;
    L.DomEvent.on(container, "click", stop)
      .on(container, "mousedown", stop)
      .on(container, "touchstart", stop)
      .on(container, "dblclick", stop)
      .on(container, "mousewheel", stop)
      .on(container, "contextmenu", stop)
      .on(container, "MozMousePixelScroll", stop);

    var innerContainer = (this._innerContainer = L.DomUtil.create(
      "div",
      className + "-inner"
    ));

    var grabberNode = (this._grabberNode = L.DomUtil.create(
      "div",
      className + "-grabber"
    ));
    var grabberIcon = L.DomUtil.create("i", "fa fa-arrows");
    grabberNode.appendChild(grabberIcon);

    L.DomEvent.on(grabberNode, "mousedown", this._handleMoveStart, this);

    var closeNode = (this._closeNode = L.DomUtil.create(
      "div",
      className + "-close"
    ));
    var closeIcon = L.DomUtil.create("i", "fa fa-times");
    closeNode.appendChild(closeIcon);
    L.DomEvent.on(closeNode, "click", this._handleClose, this);

    var resizerNode = (this._resizerNode = L.DomUtil.create(
      "div",
      className + "-resizer"
    ));
    var resizeIcon = L.DomUtil.create("i", "fa fa-arrows-h fa-rotate-45");
    resizerNode.appendChild(resizeIcon);

    L.DomEvent.on(resizerNode, "mousedown", this._handleResizeStart, this);

    var contentNode = (this._contentNode = L.DomUtil.create(
      "div",
      className + "-contents"
    ));

    container.appendChild(innerContainer);

    innerContainer.appendChild(contentNode);
    innerContainer.appendChild(grabberNode);
    innerContainer.appendChild(closeNode);
    innerContainer.appendChild(resizerNode);

    this._oldMousePos = { x: 0, y: 0 };
  },

  _handleClose: function() {
    this.close();
  },

  _handleResizeStart: function(e) {
    this._oldMousePos.x = e.clientX;
    this._oldMousePos.y = e.clientY;

    L.DomEvent.on(this._map, "mousemove", this._handleMouseMove, this);
    L.DomEvent.on(this._map, "mouseup", this._handleMouseUp, this);

    this._map.fire("dialog:resizestart", this);
    this._resizing = true;
  },

  _handleMoveStart: function(e) {
    this._oldMousePos.x = e.clientX;
    this._oldMousePos.y = e.clientY;

    L.DomEvent.on(this._map, "mousemove", this._handleMouseMove, this);
    L.DomEvent.on(this._map, "mouseup", this._handleMouseUp, this);

    this._map.fire("dialog:movestart", this);
    this._moving = true;
  },

  _handleMouseMove: function(e) {
    var diffX = e.originalEvent.clientX - this._oldMousePos.x,
      diffY = e.originalEvent.clientY - this._oldMousePos.y;

    // this helps prevent accidental highlighting on drag:
    if (e.originalEvent.stopPropagation) {
      e.originalEvent.stopPropagation();
    }
    if (e.originalEvent.preventDefault) {
      e.originalEvent.preventDefault();
    }

    if (this._resizing) {
      this._resize(diffX, diffY);
    }

    if (this._moving) {
      this._move(diffX, diffY);
    }
  },

  _handleMouseUp: function() {
    L.DomEvent.off(this._map, "mousemove", this._handleMouseMove, this);
    L.DomEvent.off(this._map, "mouseup", this._handleMouseUp, this);

    if (this._resizing) {
      this._resizing = false;
      this._map.fire("dialog:resizeend", this);
    }

    if (this._moving) {
      this._moving = false;
      this._map.fire("dialog:moveend", this);
    }
  },

  _move: function(diffX, diffY) {
    var newY = this.options.anchor[0] + diffY;
    var newX = this.options.anchor[1] + diffX;

    this.options.anchor[0] = newY;
    this.options.anchor[1] = newX;

    this._container.style.top = this.options.anchor[0] + "px";
    this._container.style.left = this.options.anchor[1] + "px";

    this._map.fire("dialog:moving", this);

    this._oldMousePos.y += diffY;
    this._oldMousePos.x += diffX;
  },

  _resize: function(diffX, diffY) {
    var newX = this.options.size[0] + diffX;
    var newY = this.options.size[1] + diffY;

    if (newX <= this.options.maxSize[0] && newX >= this.options.minSize[0]) {
      this.options.size[0] = newX;
      this._container.style.width = this.options.size[0] + "px";
      this._oldMousePos.x += diffX;
    }

    if (newY <= this.options.maxSize[1] && newY >= this.options.minSize[1]) {
      this.options.size[1] = newY;
      this._container.style.height = this.options.size[1] + "px";
      this._oldMousePos.y += diffY;
    }

    this._map.fire("dialog:resizing", this);
  },

  _updateContent: function() {
    if (!this._content) {
      return;
    }

    var node = this._contentNode;
    var content =
      typeof this._content === "function" ? this._content(this) : this._content;

    if (typeof content === "string") {
      node.innerHTML = content;
    } else {
      while (node.hasChildNodes()) {
        node.removeChild(node.firstChild);
      }
      node.appendChild(content);
    }
  },

  _updateLayout: function() {
    this._container.style.width = this.options.size[0] + "px";
    this._container.style.height = this.options.size[1] + "px";

    this._container.style.top = this.options.anchor[0] + "px";
    this._container.style.left = this.options.anchor[1] + "px";
  }
});

L.control.dialog = function(options) {
  return new L.Control.Dialog(options);
};