var Emitter = require('emitter-component');
var Hammer = require('../module/hammer');
var util = require('../util');
var DataSet = require('../DataSet');
var DataView = require('../DataView');
var Range = require('./Range');
var Core = require('./Core');
var TimeAxis = require('./component/TimeAxis');
var CurrentTime = require('./component/CurrentTime');
var CustomTime = require('./component/CustomTime');
var LineGraph = require('./component/LineGraph');

/**
 * Create a timeline visualization
 * @param {HTMLElement} container
 * @param {vis.DataSet | Array | google.visualization.DataTable} [items]
 * @param {Object} [options]  See Graph2d.setOptions for the available options.
 * @constructor
 */
function Graph2d (container, items, options, groups) {
  for (var coreProp in Core.prototype) {
    if (Core.prototype.hasOwnProperty(coreProp) && !Graph2d.prototype.hasOwnProperty(coreProp)) {
      Graph2d.prototype[coreProp] = Core.prototype[coreProp];
    }
  }

  var me = this;
  this.defaultOptions = {
    start: null,
    end:   null,

    autoResize: true,

    orientation: 'bottom',
    width: null,
    height: null,
    maxHeight: null,
    minHeight: null
  };
  this.options = util.deepExtend({}, this.defaultOptions);

  // Create the DOM, props, and emitter
  this._create(container);

  // all components listed here will be repainted automatically
  this.components = [];

  this.body = {
    dom: this.dom,
    domProps: this.props,
    emitter: {
      on: this.on.bind(this),
      off: this.off.bind(this),
      emit: this.emit.bind(this)
    },
    util: {
      snap: null, // will be specified after TimeAxis is created
      toScreen: me._toScreen.bind(me),
      toGlobalScreen: me._toGlobalScreen.bind(me), // this refers to the root.width
      toTime: me._toTime.bind(me),
      toGlobalTime : me._toGlobalTime.bind(me)
    }
  };

  // range
  this.range = new Range(this.body);
  this.components.push(this.range);
  this.body.range = this.range;

  // time axis
  this.timeAxis = new TimeAxis(this.body);
  this.components.push(this.timeAxis);
  this.body.util.snap = this.timeAxis.snap.bind(this.timeAxis);

  // current time bar
  this.currentTime = new CurrentTime(this.body);
  this.components.push(this.currentTime);

  // custom time bar
  // Note: time bar will be attached in this.setOptions when selected
  this.customTime = new CustomTime(this.body);
  this.components.push(this.customTime);

  // item set
  this.linegraph = new LineGraph(this.body);
  this.components.push(this.linegraph);

  this.itemsData = null;      // DataSet
  this.groupsData = null;     // DataSet

  // apply options
  if (options) {
    this.setOptions(options);
  }

  // IMPORTANT: THIS HAPPENS BEFORE SET ITEMS!
  if (groups) {
    this.setGroups(groups);
  }

  // create itemset
  if (items) {
    this.setItems(items);
  }
  else {
    this.redraw();
  }
}

/**
 * Set options. Options will be passed to all components loaded in the Graph2d.
 * @param {Object} [options]
 *                           {String} orientation
 *                              Vertical orientation for the Graph2d,
 *                              can be 'bottom' (default) or 'top'.
 *                           {String | Number} width
 *                              Width for the timeline, a number in pixels or
 *                              a css string like '1000px' or '75%'. '100%' by default.
 *                           {String | Number} height
 *                              Fixed height for the Graph2d, a number in pixels or
 *                              a css string like '400px' or '75%'. If undefined,
 *                              The Graph2d will automatically size such that
 *                              its contents fit.
 *                           {String | Number} minHeight
 *                              Minimum height for the Graph2d, a number in pixels or
 *                              a css string like '400px' or '75%'.
 *                           {String | Number} maxHeight
 *                              Maximum height for the Graph2d, a number in pixels or
 *                              a css string like '400px' or '75%'.
 *                           {Number | Date | String} start
 *                              Start date for the visible window
 *                           {Number | Date | String} end
 *                              End date for the visible window
 */
Graph2d.prototype.setOptions = function (options) {
  if (options) {
    // copy the known options
    var fields = ['width', 'height', 'minHeight', 'maxHeight', 'autoResize', 'start', 'end', 'orientation'];
    util.selectiveExtend(fields, this.options, options);

    // enable/disable autoResize
    this._initAutoResize();
  }

  // propagate options to all components
  this.components.forEach(function (component) {
    component.setOptions(options);
  });

  // TODO: remove deprecation error one day (deprecated since version 0.8.0)
  if (options && options.order) {
    throw new Error('Option order is deprecated. There is no replacement for this feature.');
  }

  // redraw everything
  this.redraw();
};


/**
 * Set items
 * @param {vis.DataSet | Array | google.visualization.DataTable | null} items
 */
Graph2d.prototype.setItems = function(items) {
  var initialLoad = (this.itemsData == null);

  // convert to type DataSet when needed
  var newDataSet;
  if (!items) {
    newDataSet = null;
  }
  else if (items instanceof DataSet || items instanceof DataView) {
    newDataSet = items;
  }
  else {
    // turn an array into a dataset
    newDataSet = new DataSet(items, {
      type: {
        start: 'Date',
        end: 'Date'
      }
    });
  }

  // set items
  this.itemsData = newDataSet;
  this.linegraph && this.linegraph.setItems(newDataSet);

  if (initialLoad && ('start' in this.options || 'end' in this.options)) {
    this.fit();

    var start = ('start' in this.options) ? util.convert(this.options.start, 'Date') : null;
    var end   = ('end' in this.options)   ? util.convert(this.options.end, 'Date') : null;

    this.setWindow(start, end);
  }
};

/**
 * Set groups
 * @param {vis.DataSet | Array | google.visualization.DataTable} groups
 */
Graph2d.prototype.setGroups = function(groups) {
  // convert to type DataSet when needed
  var newDataSet;
  if (!groups) {
    newDataSet = null;
  }
  else if (groups instanceof DataSet || groups instanceof DataView) {
    newDataSet = groups;
  }
  else {
    // turn an array into a dataset
    newDataSet = new DataSet(groups);
  }

  this.groupsData = newDataSet;
  this.linegraph.setGroups(newDataSet);
};

/**
 *
 * @param groupId
 * @param width
 * @param height
 */
Graph2d.prototype.getLegend = function(groupId, width, height) {
  if (width  === undefined) {width  = 15;}
  if (height === undefined) {height = 15;}
  if (this.linegraph.groups[groupId] !== undefined) {
    return this.linegraph.groups[groupId].getLegend(width,height);
  }
  else {
    return "cannot find group:" +  groupId;
  }
}

Graph2d.prototype.isGroupVisible = function(groupId) {
  if (this.linegraph.groups[groupId] !== undefined) {
    return this.linegraph.groups[groupId].visible;
  }
  else {
    return false;
  }
}


module.exports = Graph2d;