import Menu, { SubMenu, Item as MenuItem } from '../vc-menu'
import closest from 'dom-closest'
import classNames from 'classnames'
import Dropdown from '../dropdown'
import Icon from '../icon'
import Checkbox from '../checkbox'
import Radio from '../radio'
import FilterDropdownMenuWrapper from './FilterDropdownMenuWrapper'
import { FilterMenuProps } from './interface'
import { initDefaultProps } from '../_util/props-util'
import { cloneElement } from '../_util/vnode'
import BaseMixin from '../_util/BaseMixin'

export default {
  mixins: [BaseMixin],
  name: 'FilterMenu',
  props: initDefaultProps(FilterMenuProps, {
    handleFilter () {},
    column: {},
  }),

  data () {
    const visible = ('filterDropdownVisible' in this.column)
      ? this.column.filterDropdownVisible : false

    return {
      sSelectedKeys: this.selectedKeys,
      sKeyPathOfSelectedItem: {}, // 记录所有有选中子菜单的祖先菜单
      sVisible: visible,
    }
  },

  mounted () {
    const { column } = this
    this.$nextTick(() => {
      this.setNeverShown(column)
    })
  },
  watch: {
    'column.fixed': function (val) {
      this.setNeverShown(this.column)
    },
    column (val) {
      if ('filterDropdownVisible' in val) {
        this.sVisible = val.filterDropdownVisible
      }
    },
    selectedKeys (val) {
      this.sSelectedKeys = val
    },
  },
  methods: {
    setNeverShown  (column) {
      const rootNode = this.$el
      const filterBelongToScrollBody = !!closest(rootNode, `.ant-table-scroll`)
      if (filterBelongToScrollBody) {
        // When fixed column have filters, there will be two dropdown menus
        // Filter dropdown menu inside scroll body should never be shown
        // To fix https://github.com/ant-design/ant-design/issues/5010 and
        // https://github.com/ant-design/ant-design/issues/7909
        this.neverShown = !!column.fixed
      }
    },

    setSelectedKeys ({ selectedKeys }) {
      this.setState({ sSelectedKeys: selectedKeys })
    },

    setVisible (visible) {
      const { column } = this
      if (!('filterDropdownVisible' in column)) {
        this.setState({ sVisible: visible })
      }
      if (column.onFilterDropdownVisibleChange) {
        column.onFilterDropdownVisibleChange(visible)
      }
    },

    handleClearFilters () {
      this.setState({
        sSelectedKeys: [],
      }, this.handleConfirm)
    },

    handleConfirm  () {
      this.setVisible(false)
      this.confirmFilter2()
    },

    onVisibleChange  (visible) {
      this.setVisible(visible)
      if (!visible) {
        this.confirmFilter2()
      }
    },

    confirmFilter2 () {
      if (this.sSelectedKeys !== this.selectedKeys) {
        this.confirmFilter(this.column, this.sSelectedKeys)
      }
    },

    renderMenuItem (item) {
      const { column } = this
      const multiple = ('filterMultiple' in column) ? column.filterMultiple : true
      const input = multiple ? (
        <Checkbox checked={this.sSelectedKeys.indexOf(item.value.toString()) >= 0} />
      ) : (
        <Radio checked={this.sSelectedKeys.indexOf(item.value.toString()) >= 0} />
      )

      return (
        <MenuItem key={item.value}>
          {input}
          <span>{item.text}</span>
        </MenuItem>
      )
    },

    hasSubMenu () {
      const { column: { filters = [] }} = this
      return filters.some(item => !!(item.children && item.children.length > 0))
    },

    renderMenus (items) {
      return items.map(item => {
        if (item.children && item.children.length > 0) {
          const { sKeyPathOfSelectedItem } = this
          const containSelected = Object.keys(sKeyPathOfSelectedItem).some(
            key => sKeyPathOfSelectedItem[key].indexOf(item.value) >= 0,
          )
          const subMenuCls = containSelected ? `${this.dropdownPrefixCls}-submenu-contain-selected` : ''
          return (
            <SubMenu title={item.text} class={subMenuCls} key={item.value.toString()}>
              {this.renderMenus(item.children)}
            </SubMenu>
          )
        }
        return this.renderMenuItem(item)
      })
    },

    handleMenuItemClick (info) {
      if (info.keyPath.length <= 1) {
        return
      }
      const keyPathOfSelectedItem = this.sKeyPathOfSelectedItem
      if (this.sSelectedKeys.indexOf(info.key) >= 0) {
        // deselect SubMenu child
        delete keyPathOfSelectedItem[info.key]
      } else {
        // select SubMenu child
        keyPathOfSelectedItem[info.key] = info.keyPath
      }
      this.setState({ keyPathOfSelectedItem })
    },

    renderFilterIcon () {
      const { column, locale, prefixCls } = this
      const filterIcon = column.filterIcon
      const dropdownSelectedClass = this.selectedKeys.length > 0 ? `${prefixCls}-selected` : ''

      return filterIcon ? cloneElement(filterIcon, {
        attrs: {
          title: locale.filterTitle,
        },
        class: classNames(filterIcon.className, {
          [`${prefixCls}-icon`]: true,
        }),
      }) : <Icon title={locale.filterTitle} type='filter' class={dropdownSelectedClass} />
    },
  },

  render () {
    const { column, locale, prefixCls, dropdownPrefixCls, getPopupContainer } = this
    // default multiple selection in filter dropdown
    const multiple = ('filterMultiple' in column) ? column.filterMultiple : true
    const dropdownMenuClass = classNames({
      [`${dropdownPrefixCls}-menu-without-submenu`]: !this.hasSubMenu(),
    })
    const menus = column.filterDropdown ? (
      <FilterDropdownMenuWrapper>
        {column.filterDropdown}
      </FilterDropdownMenuWrapper>
    ) : (
      <FilterDropdownMenuWrapper class={`${prefixCls}-dropdown`}>
        <Menu
          multiple={multiple}
          onClick={this.handleMenuItemClick}
          prefixCls={`${dropdownPrefixCls}-menu`}
          class={dropdownMenuClass}
          onSelect={this.setSelectedKeys}
          onDeselect={this.setSelectedKeys}
          selectedKeys={this.sSelectedKeys}
        >
          {this.renderMenus(column.filters)}
        </Menu>
        <div class={`${prefixCls}-dropdown-btns`}>
          <a
            class={`${prefixCls}-dropdown-link confirm`}
            onClick={this.handleConfirm}
          >
            {locale.filterConfirm}
          </a>
          <a
            class={`${prefixCls}-dropdown-link clear`}
            onClick={this.handleClearFilters}
          >
            {locale.filterReset}
          </a>
        </div>
      </FilterDropdownMenuWrapper>
    )

    return (
      <Dropdown
        trigger={['click']}
        visible={this.neverShown ? false : this.sVisible}
        onVisibleChange={this.onVisibleChange}
        getPopupContainer={getPopupContainer}
        forceRender
      >
        <template slot='overlay'>{menus}</template>
        {this.renderFilterIcon()}
      </Dropdown>
    )
  },
}