import React from 'react';
import Checkbox from '../checkbox';
import { Store } from './createStore';
import Dropdown from '../dropdown';
import Menu from '../menu';
import Icon from '../icon';

export interface SelectionDecorator {
  key: string;
  text: React.ReactNode;
  onSelect: (changeableRowKeys: string[]) => void;
}

export interface SelectionCheckboxAllProps {
  store: Store;
  disabled: boolean;
  getCheckboxPropsByItem: (item, index) => any;
  getRecordKey: (record, index?) => string;
  data: any[];
  prefixCls: string | undefined;
  onSelect: (key: string, index: number, selectFunc: any) => void;
  selections: SelectionDecorator[];
}

const defaultSelections: SelectionDecorator[] = [{
  key: 'all',
  text: '全选',
  onSelect: () => {},
}, {
  key: 'invert',
  text: '反选',
  onSelect: () => {},
}];

export default class SelectionCheckboxAll extends React.Component<SelectionCheckboxAllProps, any> {
  unsubscribe: () => void;

  constructor(props) {
    super(props);

    this.state = {
      checked: this.getCheckState(props),
      indeterminate: this.getIndeterminateState(props),
    };
  }

  componentDidMount() {
    this.subscribe();
  }

  componentWillReceiveProps(nextProps) {
    this.setCheckState(nextProps);
  }

  componentWillUnmount() {
    if (this.unsubscribe) {
      this.unsubscribe();
    }
  }

  subscribe() {
    const { store } = this.props;
    this.unsubscribe = store.subscribe(() => {
      this.setCheckState(this.props);
    });
  }

  checkSelection(data, type, byDefaultChecked) {
    const { store, getCheckboxPropsByItem, getRecordKey } = this.props;
    // type should be 'every' | 'some'
    if (type === 'every' || type === 'some') {
      return (
        byDefaultChecked
        ? data[type]((item, i) => getCheckboxPropsByItem(item, i).defaultChecked)
        : data[type]((item, i) =>
              store.getState().selectedRowKeys.indexOf(getRecordKey(item, i)) >= 0)
      );
    }
    return false;
  }

  setCheckState(props) {
    const checked = this.getCheckState(props);
    const indeterminate = this.getIndeterminateState(props);
    if (checked !== this.state.checked) {
      this.setState({ checked });
    }
    if (indeterminate !== this.state.indeterminate) {
      this.setState({ indeterminate });
    }
  }

  getCheckState(props) {
    const { store, data } = props;
    let checked;
    if (!data.length) {
      checked = false;
    } else {
      checked = store.getState().selectionDirty
        ? this.checkSelection(data, 'every', false)
        : (
          this.checkSelection(data, 'every', false) ||
          this.checkSelection(data, 'every', true)
        );

    }
    return checked;
  }

  getIndeterminateState(props) {
    const { store, data } = props;
    let indeterminate;
    if (!data.length) {
      indeterminate = false;
    } else {
      indeterminate = store.getState().selectionDirty
        ? (
          this.checkSelection(data, 'some', false) &&
            !this.checkSelection(data, 'every', false)
        )
        : ((this.checkSelection(data, 'some', false) &&
            !this.checkSelection(data, 'every', false)) ||
            (this.checkSelection(data, 'some', true) &&
            !this.checkSelection(data, 'every', true))
          );
    }
    return indeterminate;
  }

  handleSelectAllChagne = (e) => {
    let checked = e.target.checked;
    this.props.onSelect(checked ? 'all' : 'removeAll', 0, null);
  }

  renderMenus(selections: SelectionDecorator[]) {
    return selections.map((selection, index) => {
      return (
        <Menu.Item
          key={selection.key || index}
        >
          <div
            onClick={() => {this.props.onSelect(selection.key, index, selection.onSelect);}}
          >
            {selection.text}
          </div>
        </Menu.Item>
      );
    });
  }

  render() {
    const { disabled, prefixCls } = this.props;
    const { checked, indeterminate } = this.state;

    let selectionPrefixCls = `${prefixCls}-selection`;

    let selections = defaultSelections.concat(this.props.selections || []);

    let menu = (
      <Menu
        className={`${selectionPrefixCls}-menu`}
      >
        {this.renderMenus(selections)}
      </Menu>
    );

    return (
      <div className={selectionPrefixCls}>
        <Checkbox
          checked={checked}
          indeterminate={indeterminate}
          disabled={disabled}
          onChange={this.handleSelectAllChagne}
        />
        <Dropdown
          overlay={menu}
        >
          <div className={`${selectionPrefixCls}-down`}>
            <span>
              <Icon type="down" />
            </span>
          </div>
        </Dropdown>
      </div>
    );
  }
}