import React from 'react';
import Menu, { SubMenu, Item as MenuItem } from 'rc-menu';
import Dropdown from '../dropdown';
import Icon from '../icon';
import Checkbox from '../checkbox';
import Radio from '../radio';

export interface FilterDropdownMenuWrapperProps {
  onClick?: Function;
  children?: any;
  className?: string;
}
const FilterDropdownMenuWrapper: React.StatelessComponent<FilterDropdownMenuWrapperProps> =
  ({ onClick, children, className }) =>
    <div className={className} onClick={onClick}>{children}</div>;

export interface FilterMenuProps {
  locale: any;
  selectedKeys: string[];
  column: {
    filterMultiple?: boolean,
    filterDropdown?: React.ReactNode,
    filters?: string[]
  };
  confirmFilter: (column: Object, selectedKeys: string[]) => any;
  prefixCls: string;
  dropdownPrefixCls: string;
}

export default class FilterMenu extends React.Component<FilterMenuProps, any> {
  static defaultProps = {
    handleFilter() {},
    column: null,
  };

  constructor(props) {
    super(props);

    this.state = {
      selectedKeys: props.selectedKeys,
      keyPathOfSelectedItem: {},    // 记录所有有选中子菜单的祖先菜单
      visible: false,
    };
  }

  componentWillReceiveProps(nextProps) {
    this.setState({
      selectedKeys: nextProps.selectedKeys,
    });
  }

  setSelectedKeys = ({ selectedKeys }) => {
    this.setState({ selectedKeys });
  }

  handleClearFilters = () => {
    this.setState({
      selectedKeys: [],
    }, this.handleConfirm);
  }

  handleConfirm = () => {
    this.setState({
      visible: false,
    });
    this.confirmFilter();
  }

  onVisibleChange = (visible) => {
    this.setState({
      visible,
    });
    if (!visible) {
      this.confirmFilter();
    }
  }

  confirmFilter() {
    if (this.state.selectedKeys !== this.props.selectedKeys) {
      this.props.confirmFilter(this.props.column, this.state.selectedKeys);
    }
  }

  renderMenuItem(item) {
    const { column } = this.props;
    const multiple = ('filterMultiple' in column) ? column.filterMultiple : true;
    return (
      <MenuItem key={item.value}>
        {
          multiple
            ? <Checkbox checked={this.state.selectedKeys.indexOf(item.value.toString()) >= 0} />
            : <Radio checked={this.state.selectedKeys.indexOf(item.value.toString()) >= 0} />
        }
        <span>{item.text}</span>
      </MenuItem>
    );
  }

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

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

  render() {
    const { column, locale, prefixCls, dropdownPrefixCls } = this.props;
    // default multiple selection in filter dropdown
    const multiple = ('filterMultiple' in column) ? column.filterMultiple : true;
    const menus = column.filterDropdown ? column.filterDropdown : (
      <FilterDropdownMenuWrapper className={`${prefixCls}-dropdown`}>
        <Menu
          multiple={multiple}
          onClick={this.handleMenuItemClick}
          prefixCls={`${dropdownPrefixCls}-menu`}
          onSelect={this.setSelectedKeys}
          onDeselect={this.setSelectedKeys}
          selectedKeys={this.state.selectedKeys}
        >
          {this.renderMenus(column.filters)}
        </Menu>
        <div className={`${prefixCls}-dropdown-btns`}>
          <a
            className={`${prefixCls}-dropdown-link confirm`}
            onClick={this.handleConfirm}
          >
            {locale.filterConfirm}
          </a>
          <a
            className={`${prefixCls}-dropdown-link clear`}
            onClick={this.handleClearFilters}
          >
            {locale.filterReset}
          </a>
        </div>
      </FilterDropdownMenuWrapper>
    );

    const dropdownSelectedClass = (this.props.selectedKeys.length > 0)
      ? `${prefixCls}-selected` : '';

    return (
      <Dropdown
        trigger={['click']}
        overlay={menus}
        visible={this.state.visible}
        onVisibleChange={this.onVisibleChange}
      >
        <Icon title={locale.filterTitle} type="filter" className={dropdownSelectedClass} />
      </Dropdown>
    );
  }
}