define([
  'jquery',
  'lodash',
  'angular',
  'tether-drop',
],
function ($, _, angular, Drop) {
  'use strict';

  function createAnnotationToolip(element, event, plot) {
    var injector = angular.element(document).injector();
    var content = document.createElement('div');
    content.innerHTML = '<annotation-tooltip event="event" on-edit="onEdit()"></annotation-tooltip>';

    injector.invoke(["$compile", "$rootScope", function($compile, $rootScope) {
      var eventManager = plot.getOptions().events.manager;
      var tmpScope = $rootScope.$new(true);
      tmpScope.event = event;
      tmpScope.onEdit = function() {
        eventManager.editEvent(event);
      };

      $compile(content)(tmpScope);
      tmpScope.$digest();
      tmpScope.$destroy();

      var drop = new Drop({
        target: element[0],
        content: content,
        position: "bottom center",
        classes: 'drop-popover drop-popover--annotation',
        openOn: 'hover',
        hoverCloseDelay: 200,
        tetherOptions: {
          constraints: [{to: 'window', pin: true, attachment: "both"}]
        }
      });

      drop.open();

      drop.on('close', function() {
        setTimeout(function() {
          drop.destroy();
        });
      });
    }]);
  }

  var markerElementToAttachTo = null;

  function createEditPopover(element, event, plot) {
    var eventManager = plot.getOptions().events.manager;
    if (eventManager.editorOpen) {
      // update marker element to attach to (needed in case of legend on the right
      // when there is a double render pass and the inital marker element is removed)
      markerElementToAttachTo = element;
      return;
    }

    // mark as openend
    eventManager.editorOpened();
    // set marker elment to attache to
    markerElementToAttachTo = element;

    // wait for element to be attached and positioned
    setTimeout(function() {

      var injector = angular.element(document).injector();
      var content = document.createElement('div');
      content.innerHTML = '<event-editor panel-ctrl="panelCtrl" event="event" close="close()"></event-editor>';

      injector.invoke(["$compile", "$rootScope", function($compile, $rootScope) {
        var scope = $rootScope.$new(true);
        var drop;

        scope.event = event;
        scope.panelCtrl = eventManager.panelCtrl;
        scope.close = function() {
          drop.close();
        };

        $compile(content)(scope);
        scope.$digest();

        drop = new Drop({
          target: markerElementToAttachTo[0],
          content: content,
          position: "bottom center",
          classes: 'drop-popover drop-popover--form',
          openOn: 'click',
          tetherOptions: {
            constraints: [{to: 'window', pin: true, attachment: "both"}]
          }
        });

        drop.open();
        eventManager.editorOpened();

        drop.on('close', function() {
          // need timeout here in order call drop.destroy
          setTimeout(function() {
            eventManager.editorClosed();
            scope.$destroy();
            drop.destroy();
          });
        });
      }]);

    }, 100);
  }

  /*
   * jquery.flot.events
   *
   * description: Flot plugin for adding events/markers to the plot
   * version: 0.2.5
   * authors:
   *    Alexander Wunschik <alex@wunschik.net>
   *    Joel Oughton <joeloughton@gmail.com>
   *    Nicolas Joseph <www.nicolasjoseph.com>
   *
   * website: https://github.com/mojoaxel/flot-events
   *
   * released under MIT License and GPLv2+
   */

  /**
   * A class that allows for the drawing an remove of some object
   */
  var DrawableEvent = function(object, drawFunc, clearFunc, moveFunc, left, top, width, height) {
    var _object = object;
    var	_drawFunc = drawFunc;
    var	_clearFunc = clearFunc;
    var	_moveFunc = moveFunc;
    var	_position = { left: left, top: top };
    var	_width = width;
    var	_height = height;

    this.width = function() { return _width; };
    this.height = function() { return _height; };
    this.position = function() { return _position; };
    this.draw = function() { _drawFunc(_object); };
    this.clear = function() { _clearFunc(_object); };
    this.getObject = function() { return _object; };
    this.moveTo = function(position) {
      _position = position;
      _moveFunc(_object, _position);
    };
  };

  /**
   * Event class that stores options (eventType, min, max, title, description) and the object to draw.
   */
  var VisualEvent = function(options, drawableEvent) {
    var _parent;
    var _options = options;
    var _drawableEvent = drawableEvent;
    var _hidden = false;

    this.visual = function() { return _drawableEvent; };
    this.getOptions = function() { return _options; };
    this.getParent = function() { return _parent; };
    this.isHidden = function() { return _hidden; };
    this.hide = function() { _hidden = true; };
    this.unhide = function() { _hidden = false; };
  };

  /**
   * A Class that handles the event-markers inside the given plot
   */
  var EventMarkers = function(plot) {
    var _events = [];

    this._types = [];
    this._plot = plot;
    this.eventsEnabled = false;

    this.getEvents = function() {
      return _events;
    };

    this.setTypes = function(types) {
      return this._types = types;
    };

    /**
     * create internal objects for the given events
     */
    this.setupEvents = function(events) {
      var that = this;
      var parts = _.partition(events, 'isRegion');
      var regions = parts[0];
      events = parts[1];

      $.each(events, function(index, event) {
        var ve = new VisualEvent(event, that._buildDiv(event));
        _events.push(ve);
      });

      $.each(regions, function (index, event) {
        var vre = new VisualEvent(event, that._buildRegDiv(event));
        _events.push(vre);
      });

      _events.sort(function(a, b) {
        var ao = a.getOptions(), bo = b.getOptions();
        if (ao.min > bo.min) { return 1; }
        if (ao.min < bo.min) { return -1; }
        return 0;
      });
    };

    /**
     * draw the events to the plot
     */
    this.drawEvents = function() {
      var that = this;
      // var o = this._plot.getPlotOffset();

      $.each(_events, function(index, event) {
        // check event is inside the graph range
        if (that._insidePlot(event.getOptions().min) && !event.isHidden()) {
          event.visual().draw();
        }  else {
          event.visual().getObject().hide();
        }
      });
    };

    /**
     * update the position of the event-markers (e.g. after scrolling or zooming)
     */
    this.updateEvents = function() {
      var that = this;
      var o = this._plot.getPlotOffset(), left, top;
      var xaxis = this._plot.getXAxes()[this._plot.getOptions().events.xaxis - 1];

      $.each(_events, function(index, event) {
        top = o.top + that._plot.height() - event.visual().height();
        left = xaxis.p2c(event.getOptions().min) + o.left - event.visual().width() / 2;
        event.visual().moveTo({ top: top, left: left });
      });
    };

    /**
     * remove all events from the plot
     */
    this._clearEvents = function() {
      $.each(_events, function(index, val) {
        val.visual().clear();
      });
      _events = [];
    };

    /**
     * create a DOM element for the given event
     */
    this._buildDiv = function(event) {
      var that = this;

      var container = this._plot.getPlaceholder();
      var o = this._plot.getPlotOffset();
      var axes = this._plot.getAxes();
      var xaxis = this._plot.getXAxes()[this._plot.getOptions().events.xaxis - 1];
      var yaxis, top, left, color, markerSize, markerShow, lineStyle, lineWidth;
      var markerTooltip;

      // determine the y axis used
      if (axes.yaxis && axes.yaxis.used) { yaxis = axes.yaxis; }
      if (axes.yaxis2 && axes.yaxis2.used) { yaxis = axes.yaxis2; }

      // map the eventType to a types object
      var eventTypeId = event.eventType;

      if (this._types === null || !this._types[eventTypeId] || !this._types[eventTypeId].color) {
        color = '#666';
      } else {
        color = this._types[eventTypeId].color;
      }

      if (this._types === null || !this._types[eventTypeId] || !this._types[eventTypeId].markerSize) {
        markerSize = 8; //default marker size
      } else {
        markerSize = this._types[eventTypeId].markerSize;
      }

      if (this._types === null || !this._types[eventTypeId] || this._types[eventTypeId].markerShow === undefined) {
        markerShow = true;
      } else {
        markerShow = this._types[eventTypeId].markerShow;
      }

      if (this._types === null || !this._types[eventTypeId] || this._types[eventTypeId].markerTooltip === undefined) {
        markerTooltip = true;
      } else {
        markerTooltip = this._types[eventTypeId].markerTooltip;
      }

      if (this._types == null || !this._types[eventTypeId] || !this._types[eventTypeId].lineStyle) {
        lineStyle = 'dashed'; //default line style
      } else {
        lineStyle = this._types[eventTypeId].lineStyle.toLowerCase();
      }

      if (this._types == null || !this._types[eventTypeId] || this._types[eventTypeId].lineWidth === undefined) {
        lineWidth = 1; //default line width
      } else {
        lineWidth = this._types[eventTypeId].lineWidth;
      }

      var topOffset = xaxis.options.eventSectionHeight || 0;
      topOffset = topOffset / 3;

      top = o.top + this._plot.height() + topOffset;
      left = xaxis.p2c(event.min) + o.left;

      var line = $('<div class="events_line flot-temp-elem"></div>').css({
        "position": "absolute",
        "opacity": 0.8,
        "left": left + 'px',
        "top": 8,
        "width": lineWidth + "px",
        "height": this._plot.height() + topOffset * 0.8,
        "border-left-width": lineWidth + "px",
        "border-left-style": lineStyle,
        "border-left-color": color,
        "color": color
      })
      .appendTo(container);

      if (markerShow) {
        var marker = $('<div class="events_marker"></div>').css({
          "position": "absolute",
          "left": (-markerSize - Math.round(lineWidth / 2)) + "px",
          "font-size": 0,
          "line-height": 0,
          "width": 0,
          "height": 0,
          "border-left": markerSize+"px solid transparent",
          "border-right": markerSize+"px solid transparent"
        });

        marker.appendTo(line);

        if (this._types[eventTypeId] && this._types[eventTypeId].position && this._types[eventTypeId].position.toUpperCase() === 'BOTTOM') {
          marker.css({
            "top": top-markerSize-8 +"px",
            "border-top": "none",
            "border-bottom": markerSize+"px solid " + color
          });
        } else {
          marker.css({
            "top": "0px",
            "border-top": markerSize+"px solid " + color,
            "border-bottom": "none"
          });
        }

        marker.data({
          "event": event
        });

        var mouseenter = function() {
          createAnnotationToolip(marker, $(this).data("event"), that._plot);
        };

        if (event.editModel) {
          createEditPopover(marker, event.editModel, that._plot);
        }

        var mouseleave = function() {
          that._plot.clearSelection();
        };

        if (markerTooltip) {
          marker.css({ "cursor": "help" });
          marker.hover(mouseenter, mouseleave);
        }
      }

      var drawableEvent = new DrawableEvent(
        line,
        function drawFunc(obj) { obj.show(); },
        function(obj) { obj.remove(); },
        function(obj, position) {
          obj.css({
            top: position.top,
            left: position.left
          });
        },
        left,
        top,
        line.width(),
        line.height()
      );

      return drawableEvent;
    };

    /**
     * create a DOM element for the given region
     */
    this._buildRegDiv = function (event) {
      var that = this;

      var container = this._plot.getPlaceholder();
      var o = this._plot.getPlotOffset();
      var axes = this._plot.getAxes();
      var xaxis = this._plot.getXAxes()[this._plot.getOptions().events.xaxis - 1];
      var yaxis, top, left, lineWidth, regionWidth, lineStyle, color, markerTooltip;

      // determine the y axis used
      if (axes.yaxis && axes.yaxis.used) { yaxis = axes.yaxis; }
      if (axes.yaxis2 && axes.yaxis2.used) { yaxis = axes.yaxis2; }

      // map the eventType to a types object
      var eventTypeId = event.eventType;

      if (this._types === null || !this._types[eventTypeId] || !this._types[eventTypeId].color) {
        color = '#666';
      } else {
        color = this._types[eventTypeId].color;
      }

      if (this._types === null || !this._types[eventTypeId] || this._types[eventTypeId].markerTooltip === undefined) {
        markerTooltip = true;
      } else {
        markerTooltip = this._types[eventTypeId].markerTooltip;
      }

      if (this._types == null || !this._types[eventTypeId] || this._types[eventTypeId].lineWidth === undefined) {
        lineWidth = 1; //default line width
      } else {
        lineWidth = this._types[eventTypeId].lineWidth;
      }

      if (this._types == null || !this._types[eventTypeId] || !this._types[eventTypeId].lineStyle) {
        lineStyle = 'dashed'; //default line style
      } else {
        lineStyle = this._types[eventTypeId].lineStyle.toLowerCase();
      }

      var topOffset = 2;
      top = o.top + this._plot.height() + topOffset;

      var timeFrom = Math.min(event.min, event.timeEnd);
      var timeTo = Math.max(event.min, event.timeEnd);
      left = xaxis.p2c(timeFrom) + o.left;
      var right = xaxis.p2c(timeTo) + o.left;
      regionWidth = right - left;

      _.each([left, right], function(position) {
        var line = $('<div class="events_line flot-temp-elem"></div>').css({
          "position": "absolute",
          "opacity": 0.8,
          "left": position + 'px',
          "top": 8,
          "width": lineWidth + "px",
          "height": that._plot.height() + topOffset,
          "border-left-width": lineWidth + "px",
          "border-left-style": lineStyle,
          "border-left-color": color,
          "color": color
        });
        line.appendTo(container);
      });

      var region = $('<div class="events_marker region_marker flot-temp-elem"></div>').css({
        "position": "absolute",
        "opacity": 0.5,
        "left": left + 'px',
        "top": top,
        "width": Math.round(regionWidth + lineWidth) + "px",
        "height": "0.5rem",
        "border-left-color": color,
        "color": color,
        "background-color": color
      });
      region.appendTo(container);

      region.data({
        "event": event
      });

      var mouseenter = function () {
        createAnnotationToolip(region, $(this).data("event"), that._plot);
      };

      if (event.editModel) {
        createEditPopover(region, event.editModel, that._plot);
      }

      var mouseleave = function () {
        that._plot.clearSelection();
      };

      if (markerTooltip) {
        region.css({ "cursor": "help" });
        region.hover(mouseenter, mouseleave);
      }

      var drawableEvent = new DrawableEvent(
        region,
        function drawFunc(obj) { obj.show(); },
        function (obj) { obj.remove(); },
        function (obj, position) {
          obj.css({
            top: position.top,
            left: position.left
          });
        },
        left,
        top,
        region.width(),
        region.height()
      );

      return drawableEvent;
    };

    /**
     * check if the event is inside visible range
     */
    this._insidePlot = function(x) {
      var xaxis = this._plot.getXAxes()[this._plot.getOptions().events.xaxis - 1];
      var xc = xaxis.p2c(x);
      return xc > 0 && xc < xaxis.p2c(xaxis.max);
    };
  };

  /**
   * initialize the plugin for the given plot
   */
  function init(plot) {
    /*jshint validthis:true */
    var that = this;
    var eventMarkers = new EventMarkers(plot);

    plot.getEvents = function() {
      return eventMarkers._events;
    };

    plot.hideEvents = function() {
      $.each(eventMarkers._events, function(index, event) {
        event.visual().getObject().hide();
      });
    };

    plot.showEvents = function() {
      plot.hideEvents();
      $.each(eventMarkers._events, function(index, event) {
        event.hide();
      });

      that.eventMarkers.drawEvents();
    };

    // change events on an existing plot
    plot.setEvents = function(events) {
      if (eventMarkers.eventsEnabled) {
        eventMarkers.setupEvents(events);
      }
    };

    plot.hooks.processOptions.push(function(plot, options) {
      // enable the plugin
      if (options.events.data != null) {
        eventMarkers.eventsEnabled = true;
      }
    });

    plot.hooks.draw.push(function(plot) {
      var options = plot.getOptions();

      if (eventMarkers.eventsEnabled) {
        // check for first run
        if (eventMarkers.getEvents().length < 1) {
          eventMarkers.setTypes(options.events.types);
          eventMarkers.setupEvents(options.events.data);
        } else {
          eventMarkers.updateEvents();
        }
      }

      eventMarkers.drawEvents();
    });
  }

  var defaultOptions = {
    events: {
      data: null,
      types: null,
      xaxis: 1,
      position: 'BOTTOM'
    }
  };

  $.plot.plugins.push({
    init: init,
    options: defaultOptions,
    name: "events",
    version: "0.2.5"
  });
});