/**
 * 抽屉模块
 */
layui.define(['jquery', 'layer'], function (exports) {
  ('use strict');

  var MOD_NAME = 'drawer';
  var $ = layui.jquery;
  var layer = layui.layer;

  layui.link(layui.cache.base + 'drawer/drawer.css');
  var drawer = new (function () {
    this.open = function (option) {
      return layerDrawer(option);
    };
    this.title = layer.title;
    this.style = layer.style;
    this.close = layer.close;
    this.closeAll = layer.closeAll;
  })();

  /**
   *
   * 封装 layer.open
   *
   * @param {object} option, `type`, `anim`, `move`, `fixed`, `skin`,`maxWidth`, `maxHeight`, `moveOut`, `moveEnd` 不可用,其它参数和 layer.open 一致, 新增 `iframe`和 `url`参数
   * @returns {number} 原生 layer 的 index
   */
  function layerDrawer(option) {
    var opt = normalizeOption(option);
    if (opt.target) appendToTarget(opt);
    if (opt.url) loadFragment(opt);
    if (opt.shade) {
      $('<style/>')
        .attr('id', 'layer-drawer')
        .html('.layui-layer-shade{opacity: 0;transition: opacity .35s cubic-bezier(0.34, 0.69, 0.1, 1);}') // fadeIn
        .appendTo('head');

      option.end = Aspect(option.end, undefined, function (layero, index) {
        $('#layer-drawer').remove();
      });
    }
    return layer.open(opt);
  }

  /**
   * 加载 HTML 片段到 layer content
   * @param {object} option 设置选项
   */
  function loadFragment(option) {
    option.success = Aspect(option.success, function (layero) {
      $.ajax({
        url: option.url,
        dataType: 'html',
        success: function (result) {
          layero.children('.layui-layer-content').html(result);
        },
      });
    });
  }

  /**
   *将 layer 附加到指定节点
   * @param {object} opt 设置选项
   */
  function appendToTarget(opt) {
    var targetDOM = $(opt.target);
    var contentDOM = opt.content;

    contentDOM.appendTo(targetDOM);
    opt.skin = getDrawerAnimationClass(opt.offset, true);
    opt.offset = calcOffset(opt.offset, opt.area, targetDOM);
    // 处理关闭后偶现 DOM 仍显示的问题
    opt.end = Aspect(opt.end, function () {
      contentDOM.css('display', 'none');
    });
    if (opt.shade) {
      opt.success = Aspect(opt.success, function (layero, index) {
        var shadeDOM = $('#layui-layer-shade' + index);
        shadeDOM.css('position', 'absolute');
        shadeDOM.appendTo(layero.parent());
      });
    }
  }

  /**
   * 规范化 layer.open 选项
   * @param {object} option layer.open 的选项
   * @returns 规范化后的选项
   */
  function normalizeOption(option) {
    option.type = option.iframe ? 2 : 1;
    option.anim = -1;
    option.move = false;
    option.fixed = true;
    option.content = option.iframe ? option.iframe : option.content;
    if (option.offset === undefined) option.offset = 'r';
    option.area = calcDrawerArea(option.offset, option.area);
    option.skin = getDrawerAnimationClass(option.offset);
    if (option.title === undefined) option.title = false;
    if (option.closeBtn === undefined) option.closeBtn = false;
    if (option.shade === undefined) option.shade = 0.3;
    if (option.shadeClose === undefined) option.shadeClose = true;
    if (option.resize === undefined) option.resize = false;
    if (option.success === undefined) option.success = function () {}; // 处理遮罩需要
    if (option.end === undefined) option.end = function () {};
    return option;
  }

  /**
   * 计算抽屉宽高
   * @param {string} offset 抽屉方向 l = 左, r = 右, t = 上, b = 下
   * @param {string[] | string} drawerArea 抽屉大小，字符串数组格式[width, height]：["200px","100%"]，字符串格式："30%" "200px"。
   * @returns{string[]} 抽屉宽高数组
   */
  function calcDrawerArea(offset, drawerArea) {
    if (drawerArea instanceof Array) {
      return drawerArea;
    }
    drawerArea = drawerArea === undefined || drawerArea === 'auto' ? '30%' : drawerArea;
    if (offset === 'l' || offset === 'r') {
      return [drawerArea, '100%'];
    } else if (offset === 't' || offset === 'b') {
      return ['100%', drawerArea];
    }
  }

  /**
   * 获取抽屉动画类，指定挂载容器时需要设置绝对定位
   * @param {string} offset 抽屉方向 l = 左, r = 右, t = 上, b = 下
   * @param {boolean} [isAbsolute] 是否是绝对定位
   * @returns {string} 抽屉入场动画类
   */
  function getDrawerAnimationClass(offset, isAbsolute) {
    var prefixClass = 'layer-drawer layer-drawer-anim layui-anim layer-anim-';
    var suffix = 'rl';
    if (offset === 'l') {
      suffix = 'lr';
    } else if (offset === 'r') {
      suffix = 'rl';
    } else if (offset === 't') {
      suffix = 'tb';
    } else if (offset === 'b') {
      suffix = 'bt';
    }
    return prefixClass + suffix + (isAbsolute ? ' position-absolute ' : '');
  }

  /**
   * 指定挂载容器重新计算 offset
   *
   * layer 源码中使用窗口宽高计算位置，所以此
   * @param {string} offset 位置
   * @param {string | string[]} area  范围大小
   * @param {*} targetEl 挂载节点
   * @returns 包含抽屉位置信息的数组，[top, left]
   */
  function calcOffset(offset, area, targetEl) {
    // https://gitee.com/layui/layui/blob/main/src/modules/layer.js#L560
    if (offset === undefined || offset === 'l' || offset === 't') {
      offset = 'lt';
    } else if (offset === 'r') {
      // https://gitee.com/layui/layui/blob/main/src/modules/layer.js#L554
      area = area instanceof Array ? area[0] : area;
      var left = /%$/.test(area)
        ? targetEl.innerWidth() * (1 - window.parseFloat(area) / 100)
        : targetEl.innerWidth() - window.parseFloat(area);
      offset = ['0', left];
    } else if (offset === 'b') {
      area = area instanceof Array ? area[1] : area;
      var top = /%$/.test(area)
        ? targetEl.innerHeight() * (1 - window.parseFloat(area) / 100)
        : targetEl.innerHeight() - window.parseFloat(area);
      offset = [top, '0'];
    }
    return offset;
  }

  /**
   * 简易的切面
   * @param {Function} target 被通知的对象，原函数
   * @param {Function | undefined} [before] 前置通知
   * @param {Function | undefined} [after] 后置通知
   * @returns 代理函数
   */
  function Aspect(target, before, after) {
    function proxyFunc() {
      if (before && typeof before === 'function') {
        before.apply(this, arguments);
      }
      target.apply(this, arguments);
      if (after && typeof after === 'function') {
        after.apply(this, arguments);
      }
    }
    return proxyFunc;
  }

  exports(MOD_NAME, drawer);
});