var zrUtil = require("@okfe/zrender/lib/core/util");

var layout = require("../../util/layout");

var numberUtil = require("../../util/number");

var CoordinateSystem = require("../../CoordinateSystem");

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/
// (24*60*60*1000)
var PROXIMATE_ONE_DAY = 86400000;
/**
 * Calendar
 *
 * @constructor
 *
 * @param {Object} calendarModel calendarModel
 * @param {Object} ecModel       ecModel
 * @param {Object} api           api
 */

function Calendar(calendarModel, ecModel, api) {
  this._model = calendarModel;
}

Calendar.prototype = {
  constructor: Calendar,
  type: 'calendar',
  dimensions: ['time', 'value'],
  // Required in createListFromData
  getDimensionsInfo: function () {
    return [{
      name: 'time',
      type: 'time'
    }, 'value'];
  },
  getRangeInfo: function () {
    return this._rangeInfo;
  },
  getModel: function () {
    return this._model;
  },
  getRect: function () {
    return this._rect;
  },
  getCellWidth: function () {
    return this._sw;
  },
  getCellHeight: function () {
    return this._sh;
  },
  getOrient: function () {
    return this._orient;
  },

  /**
   * getFirstDayOfWeek
   *
   * @example
   *     0 : start at Sunday
   *     1 : start at Monday
   *
   * @return {number}
   */
  getFirstDayOfWeek: function () {
    return this._firstDayOfWeek;
  },

  /**
   * get date info
   *
   * @param  {string|number} date date
   * @return {Object}
   * {
   *      y: string, local full year, eg., '1940',
   *      m: string, local month, from '01' ot '12',
   *      d: string, local date, from '01' to '31' (if exists),
   *      day: It is not date.getDay(). It is the location of the cell in a week, from 0 to 6,
   *      time: timestamp,
   *      formatedDate: string, yyyy-MM-dd,
   *      date: original date object.
   * }
   */
  getDateInfo: function (date) {
    date = numberUtil.parseDate(date);
    var y = date.getFullYear();
    var m = date.getMonth() + 1;
    m = m < 10 ? '0' + m : m;
    var d = date.getDate();
    d = d < 10 ? '0' + d : d;
    var day = date.getDay();
    day = Math.abs((day + 7 - this.getFirstDayOfWeek()) % 7);
    return {
      y: y,
      m: m,
      d: d,
      day: day,
      time: date.getTime(),
      formatedDate: y + '-' + m + '-' + d,
      date: date
    };
  },
  getNextNDay: function (date, n) {
    n = n || 0;

    if (n === 0) {
      return this.getDateInfo(date);
    }

    date = new Date(this.getDateInfo(date).time);
    date.setDate(date.getDate() + n);
    return this.getDateInfo(date);
  },
  update: function (ecModel, api) {
    this._firstDayOfWeek = +this._model.getModel('dayLabel').get('firstDay');
    this._orient = this._model.get('orient');
    this._lineWidth = this._model.getModel('itemStyle').getItemStyle().lineWidth || 0;
    this._rangeInfo = this._getRangeInfo(this._initRangeOption());
    var weeks = this._rangeInfo.weeks || 1;
    var whNames = ['width', 'height'];

    var cellSize = this._model.get('cellSize').slice();

    var layoutParams = this._model.getBoxLayoutParams();

    var cellNumbers = this._orient === 'horizontal' ? [weeks, 7] : [7, weeks];
    zrUtil.each([0, 1], function (idx) {
      if (cellSizeSpecified(cellSize, idx)) {
        layoutParams[whNames[idx]] = cellSize[idx] * cellNumbers[idx];
      }
    });
    var whGlobal = {
      width: api.getWidth(),
      height: api.getHeight()
    };
    var calendarRect = this._rect = layout.getLayoutRect(layoutParams, whGlobal);
    zrUtil.each([0, 1], function (idx) {
      if (!cellSizeSpecified(cellSize, idx)) {
        cellSize[idx] = calendarRect[whNames[idx]] / cellNumbers[idx];
      }
    });

    function cellSizeSpecified(cellSize, idx) {
      return cellSize[idx] != null && cellSize[idx] !== 'auto';
    }

    this._sw = cellSize[0];
    this._sh = cellSize[1];
  },

  /**
   * Convert a time data(time, value) item to (x, y) point.
   *
   * @override
   * @param  {Array|number} data data
   * @param  {boolean} [clamp=true] out of range
   * @return {Array} point
   */
  dataToPoint: function (data, clamp) {
    zrUtil.isArray(data) && (data = data[0]);
    clamp == null && (clamp = true);
    var dayInfo = this.getDateInfo(data);
    var range = this._rangeInfo;
    var date = dayInfo.formatedDate; // if not in range return [NaN, NaN]

    if (clamp && !(dayInfo.time >= range.start.time && dayInfo.time < range.end.time + PROXIMATE_ONE_DAY)) {
      return [NaN, NaN];
    }

    var week = dayInfo.day;

    var nthWeek = this._getRangeInfo([range.start.time, date]).nthWeek;

    if (this._orient === 'vertical') {
      return [this._rect.x + week * this._sw + this._sw / 2, this._rect.y + nthWeek * this._sh + this._sh / 2];
    }

    return [this._rect.x + nthWeek * this._sw + this._sw / 2, this._rect.y + week * this._sh + this._sh / 2];
  },

  /**
   * Convert a (x, y) point to time data
   *
   * @override
   * @param  {string} point point
   * @return {string}       data
   */
  pointToData: function (point) {
    var date = this.pointToDate(point);
    return date && date.time;
  },

  /**
   * Convert a time date item to (x, y) four point.
   *
   * @param  {Array} data  date[0] is date
   * @param  {boolean} [clamp=true]  out of range
   * @return {Object}       point
   */
  dataToRect: function (data, clamp) {
    var point = this.dataToPoint(data, clamp);
    return {
      contentShape: {
        x: point[0] - (this._sw - this._lineWidth) / 2,
        y: point[1] - (this._sh - this._lineWidth) / 2,
        width: this._sw - this._lineWidth,
        height: this._sh - this._lineWidth
      },
      center: point,
      tl: [point[0] - this._sw / 2, point[1] - this._sh / 2],
      tr: [point[0] + this._sw / 2, point[1] - this._sh / 2],
      br: [point[0] + this._sw / 2, point[1] + this._sh / 2],
      bl: [point[0] - this._sw / 2, point[1] + this._sh / 2]
    };
  },

  /**
   * Convert a (x, y) point to time date
   *
   * @param  {Array} point point
   * @return {Object}       date
   */
  pointToDate: function (point) {
    var nthX = Math.floor((point[0] - this._rect.x) / this._sw) + 1;
    var nthY = Math.floor((point[1] - this._rect.y) / this._sh) + 1;
    var range = this._rangeInfo.range;

    if (this._orient === 'vertical') {
      return this._getDateByWeeksAndDay(nthY, nthX - 1, range);
    }

    return this._getDateByWeeksAndDay(nthX, nthY - 1, range);
  },

  /**
   * @inheritDoc
   */
  convertToPixel: zrUtil.curry(doConvert, 'dataToPoint'),

  /**
   * @inheritDoc
   */
  convertFromPixel: zrUtil.curry(doConvert, 'pointToData'),

  /**
   * initRange
   *
   * @private
   * @return {Array} [start, end]
   */
  _initRangeOption: function () {
    var range = this._model.get('range');

    var rg = range;

    if (zrUtil.isArray(rg) && rg.length === 1) {
      rg = rg[0];
    }

    if (/^\d{4}$/.test(rg)) {
      range = [rg + '-01-01', rg + '-12-31'];
    }

    if (/^\d{4}[\/|-]\d{1,2}$/.test(rg)) {
      var start = this.getDateInfo(rg);
      var firstDay = start.date;
      firstDay.setMonth(firstDay.getMonth() + 1);
      var end = this.getNextNDay(firstDay, -1);
      range = [start.formatedDate, end.formatedDate];
    }

    if (/^\d{4}[\/|-]\d{1,2}[\/|-]\d{1,2}$/.test(rg)) {
      range = [rg, rg];
    }

    var tmp = this._getRangeInfo(range);

    if (tmp.start.time > tmp.end.time) {
      range.reverse();
    }

    return range;
  },

  /**
   * range info
   *
   * @private
   * @param  {Array} range range ['2017-01-01', '2017-07-08']
   *  If range[0] > range[1], they will not be reversed.
   * @return {Object}       obj
   */
  _getRangeInfo: function (range) {
    range = [this.getDateInfo(range[0]), this.getDateInfo(range[1])];
    var reversed;

    if (range[0].time > range[1].time) {
      reversed = true;
      range.reverse();
    }

    var allDay = Math.floor(range[1].time / PROXIMATE_ONE_DAY) - Math.floor(range[0].time / PROXIMATE_ONE_DAY) + 1; // Consider case:
    // Firstly set system timezone as "Time Zone: America/Toronto",
    // ```
    // var first = new Date(1478412000000 - 3600 * 1000 * 2.5);
    // var second = new Date(1478412000000);
    // var allDays = Math.floor(second / ONE_DAY) - Math.floor(first / ONE_DAY) + 1;
    // ```
    // will get wrong result because of DST. So we should fix it.

    var date = new Date(range[0].time);
    var startDateNum = date.getDate();
    var endDateNum = range[1].date.getDate();
    date.setDate(startDateNum + allDay - 1); // The bias can not over a month, so just compare date.

    if (date.getDate() !== endDateNum) {
      var sign = date.getTime() - range[1].time > 0 ? 1 : -1;

      while (date.getDate() !== endDateNum && (date.getTime() - range[1].time) * sign > 0) {
        allDay -= sign;
        date.setDate(startDateNum + allDay - 1);
      }
    }

    var weeks = Math.floor((allDay + range[0].day + 6) / 7);
    var nthWeek = reversed ? -weeks + 1 : weeks - 1;
    reversed && range.reverse();
    return {
      range: [range[0].formatedDate, range[1].formatedDate],
      start: range[0],
      end: range[1],
      allDay: allDay,
      weeks: weeks,
      // From 0.
      nthWeek: nthWeek,
      fweek: range[0].day,
      lweek: range[1].day
    };
  },

  /**
   * get date by nthWeeks and week day in range
   *
   * @private
   * @param  {number} nthWeek the week
   * @param  {number} day   the week day
   * @param  {Array} range [d1, d2]
   * @return {Object}
   */
  _getDateByWeeksAndDay: function (nthWeek, day, range) {
    var rangeInfo = this._getRangeInfo(range);

    if (nthWeek > rangeInfo.weeks || nthWeek === 0 && day < rangeInfo.fweek || nthWeek === rangeInfo.weeks && day > rangeInfo.lweek) {
      return false;
    }

    var nthDay = (nthWeek - 1) * 7 - rangeInfo.fweek + day;
    var date = new Date(rangeInfo.start.time);
    date.setDate(rangeInfo.start.d + nthDay);
    return this.getDateInfo(date);
  }
};
Calendar.dimensions = Calendar.prototype.dimensions;
Calendar.getDimensionsInfo = Calendar.prototype.getDimensionsInfo;

Calendar.create = function (ecModel, api) {
  var calendarList = [];
  ecModel.eachComponent('calendar', function (calendarModel) {
    var calendar = new Calendar(calendarModel, ecModel, api);
    calendarList.push(calendar);
    calendarModel.coordinateSystem = calendar;
  });
  ecModel.eachSeries(function (calendarSeries) {
    if (calendarSeries.get('coordinateSystem') === 'calendar') {
      // Inject coordinate system
      calendarSeries.coordinateSystem = calendarList[calendarSeries.get('calendarIndex') || 0];
    }
  });
  return calendarList;
};

function doConvert(methodName, ecModel, finder, value) {
  var calendarModel = finder.calendarModel;
  var seriesModel = finder.seriesModel;
  var coordSys = calendarModel ? calendarModel.coordinateSystem : seriesModel ? seriesModel.coordinateSystem : null;
  return coordSys === this ? coordSys[methodName](value) : null;
}

CoordinateSystem.register('calendar', Calendar);
var _default = Calendar;
module.exports = _default;