import React, { PropTypes } from 'react';
import Checkbox from '../checkbox';
import Search from './search';
import classNames from 'classnames';
import Animate from 'rc-animate';

function noop() {
}

export default class TransferList extends React.Component {

  constructor(props) {
    super(props);
    this.state = {
      mounted: false,
    };
  }

  componentDidMount() {
    setTimeout(() => {
      this.setState({
        mounted: true,
      });
    }, 0);
  }

  handleSelectAll() {
    this.props.handleSelectAll();
  }

  handleSelect(selectedItem) {
    const { checkedKeys } = this.props;
    const result = checkedKeys.some((key) => key === selectedItem.key);
    this.props.handleSelect(selectedItem, !result);
  }

  handleFilter(e) {
    this.props.handleFilter(e);
  }

  handleClear() {
    this.props.handleClear();
  }

  renderCheckbox(props) {
    const { prefixCls } = props;
    const checkboxCls = classNames({
      [`${prefixCls}-checkbox`]: true,
      [`${prefixCls}-checkbox-indeterminate`]: props.checkPart,
      [`${prefixCls}-checkbox-checked`]: (!props.checkPart) && props.checked,
      [`${prefixCls}-checkbox-disabled`]: !!props.disabled,
    });
    let customEle = null;
    if (typeof props.checkable !== 'boolean') {
      customEle = props.checkable;
    }
    return (
      <span ref="checkbox"
        className={checkboxCls}
        onClick={(!props.disabled) && this.handleSelectAll.bind(this)}>
        {customEle}
      </span>
    );
  }

  matchFilter(text, filterText) {
    const regex = new RegExp(filterText);
    return text.match(regex);
  }

  render() {
    const { prefixCls, dataSource, titleText, filter, checkedKeys,
            checkStatus, body, footer, showSearch } = this.props;

    let { searchPlaceholder, notFoundContent } = this.props;

    // Custom Layout
    const footerDom = footer({ ...this.props });
    const bodyDom = body({ ...this.props });

    const listCls = classNames({
      [prefixCls]: true,
      [`${prefixCls}-with-footer`]: !!footerDom,
    });

    const showItems = dataSource.filter((item) => {
      const itemText = this.props.render(item);
      const filterResult = this.matchFilter(itemText, filter);
      return !!filterResult;
    }).map((item) => {
      const renderedText = this.props.render(item);
      return (
        <li onClick={this.handleSelect.bind(this, item)} key={item.key} title={renderedText}>
          <Checkbox checked={checkedKeys.some(key => key === item.key)} />
          {renderedText}
        </li>
      );
    });

    let unit = '条';
    if (this.context.antLocale &&
        this.context.antLocale.Transfer) {
      unit = dataSource.length > 1
        ? this.context.antLocale.Transfer.itemsUnit
        : this.context.antLocale.Transfer.itemUnit;
      searchPlaceholder = searchPlaceholder
        || this.context.antLocale.Transfer.searchPlaceholder;
      notFoundContent = notFoundContent
        || this.context.antLocale.Transfer.notFoundContent;
    }

    return (
      <div className={listCls} {...this.props}>
        <div className={`${prefixCls}-header`}>
          {this.renderCheckbox({
            prefixCls: 'ant-transfer',
            checked: checkStatus === 'all',
            checkPart: checkStatus === 'part',
            checkable: <span className={'ant-transfer-checkbox-inner'}></span>
          })}
          <span className={`${prefixCls}-header-selected`}>
            <span>
              {(checkedKeys.length > 0 ? `${checkedKeys.length}/` : '') + dataSource.length} {unit}
            </span>
            <span className={`${prefixCls}-header-title`}>
              {titleText}
            </span>
          </span>
        </div>
        { bodyDom ||
        <div className={ showSearch ? `${prefixCls}-body ${prefixCls}-body-with-search` : `${prefixCls}-body`}>
          { showSearch ? <div className={`${prefixCls}-body-search-wrapper`}>
            <Search prefixCls={`${prefixCls}-search`}
              onChange={this.handleFilter.bind(this)}
              handleClear={this.handleClear.bind(this)}
              placeholder={searchPlaceholder || '请输入搜索内容'}
              value={filter} />
          </div> : null }
          <Animate component="ul"
            transitionName={this.state.mounted ? `${prefixCls}-highlight` : ''}
            transitionLeave={false}>
            {showItems.length > 0
              ? showItems
              : <div className={`${prefixCls}-body-not-found`}>{notFoundContent || '列表为空'}</div>}
          </Animate>
        </div>}
        { footerDom ? <div className={`${prefixCls}-footer`}>
          { footerDom }
        </div> : null }
      </div>
    );
  }
}

TransferList.defaultProps = {
  dataSource: [],
  titleText: '',
  showSearch: false,
  handleFilter: noop,
  handleSelect: noop,
  handleSelectAll: noop,
  render: noop,
  // advanced
  body: noop,
  footer: noop,
};

TransferList.propTypes = {
  prefixCls: PropTypes.string,
  dataSource: PropTypes.array,
  showSearch: PropTypes.bool,
  searchPlaceholder: PropTypes.string,
  titleText: PropTypes.string,
  style: PropTypes.object,
  handleFilter: PropTypes.func,
  handleSelect: PropTypes.func,
  handleSelectAll: PropTypes.func,
  render: PropTypes.func,
  body: PropTypes.func,
  footer: PropTypes.func,
};

TransferList.contextTypes = {
  antLocale: React.PropTypes.object,
};