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

/*
* 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.
*/

/**
 * @param {number} [time=500] Time in ms
 * @param {string} [easing='linear']
 * @param {number} [delay=0]
 * @param {Function} [callback]
 *
 * @example
 *  // Animate position
 *  animation
 *      .createWrap()
 *      .add(el1, {position: [10, 10]})
 *      .add(el2, {shape: {width: 500}, style: {fill: 'red'}}, 400)
 *      .done(function () { // done })
 *      .start('cubicOut');
 */
function createWrap() {
  var storage = [];
  var elExistsMap = {};
  var doneCallback;
  return {
    /**
     * Caution: a el can only be added once, otherwise 'done'
     * might not be called. This method checks this (by el.id),
     * suppresses adding and returns false when existing el found.
     *
     * @param {modele:zrender/Element} el
     * @param {Object} target
     * @param {number} [time=500]
     * @param {number} [delay=0]
     * @param {string} [easing='linear']
     * @return {boolean} Whether adding succeeded.
     *
     * @example
     *     add(el, target, time, delay, easing);
     *     add(el, target, time, easing);
     *     add(el, target, time);
     *     add(el, target);
     */
    add: function (el, target, time, delay, easing) {
      if (zrUtil.isString(delay)) {
        easing = delay;
        delay = 0;
      }

      if (elExistsMap[el.id]) {
        return false;
      }

      elExistsMap[el.id] = 1;
      storage.push({
        el: el,
        target: target,
        time: time,
        delay: delay,
        easing: easing
      });
      return true;
    },

    /**
     * Only execute when animation finished. Will not execute when any
     * of 'stop' or 'stopAnimation' called.
     *
     * @param {Function} callback
     */
    done: function (callback) {
      doneCallback = callback;
      return this;
    },

    /**
     * Will stop exist animation firstly.
     */
    start: function () {
      var count = storage.length;

      for (var i = 0, len = storage.length; i < len; i++) {
        var item = storage[i];
        item.el.animateTo(item.target, item.time, item.delay, item.easing, done);
      }

      return this;

      function done() {
        count--;

        if (!count) {
          storage.length = 0;
          elExistsMap = {};
          doneCallback && doneCallback();
        }
      }
    }
  };
}

exports.createWrap = createWrap;