import React, { Component, PropTypes } from 'react';
import List from './list';
import Operation from './operation';
import Search from './search';
import classNames from 'classnames';

function noop() {
}

class Transfer extends Component {

  constructor(props) {
    super(props);

    this.state = {
      leftFilter: '',
      rightFilter: '',
      leftCheckedKeys: [],
      rightCheckedKeys: [],
    };
  }

  splitDataSource() {
    const { targetKeys, dataSource } = this.props;

    let leftDataSource = Object.assign([], dataSource);
    let rightDataSource = [];

    if ( targetKeys.length > 0 ) {
      targetKeys.forEach((targetKey) => {
        rightDataSource.push(leftDataSource.find((data, index) => {
          if( data.key === targetKey ) {
            leftDataSource.splice(index, 1);
            return true;
          }
        }));
      });
    }

    return {
      leftDataSource: leftDataSource,
      rightDataSource: rightDataSource,
    };
  }

  moveTo(direction) {
    const { targetKeys } = this.props;
    const { leftCheckedKeys, rightCheckedKeys } = this.state;
    // move items to target box
    const newTargetKeys = direction === 'right' ?
      leftCheckedKeys.concat(targetKeys) :
      targetKeys.filter((targetKey) => !rightCheckedKeys.some((checkedKey) => targetKey === checkedKey));

    // empty checked keys
    this.setState({
      [direction === 'right' ? 'leftCheckedKeys' : 'rightCheckedKeys']:  [],
    });

    this.props.onChange(newTargetKeys);
  }

  getGlobalCheckStatus(direction) {
    const { leftDataSource, rightDataSource } = this.splitDataSource();
    const { leftFilter, rightFilter, leftCheckedKeys, rightCheckedKeys } = this.state;

    const dataSource = direction === 'left' ? leftDataSource : rightDataSource;
    const filter = direction === 'left' ? leftFilter : rightFilter;
    const checkedKeys = direction === 'left' ? leftCheckedKeys : rightCheckedKeys;
    const filteredDataSource = this.filterDataSource(dataSource, filter);

    let globalCheckStatus;

    if ( checkedKeys.length > 0 ) {
      if ( checkedKeys.length < filteredDataSource.length ) {
        globalCheckStatus = 'part';
      } else {
        globalCheckStatus = 'all';
      }
    } else {
      globalCheckStatus = 'none';
    }
    return globalCheckStatus;
  }

  filterDataSource(dataSource, filter) {
    return dataSource.filter(item => {
      const itemText = this.props.render(item);
      return this.matchFilter(itemText, filter);
    });
  }

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

  handleSelectAll(direction) {
    const { leftDataSource, rightDataSource } = this.splitDataSource();
    const { leftFilter, rightFilter } = this.state;
    const dataSource = direction === 'left' ? leftDataSource : rightDataSource;
    const filter = direction === 'left' ? leftFilter : rightFilter;
    const checkStatus = this.getGlobalCheckStatus(direction);
    let holder = [];

    if ( checkStatus === 'all' ) {
      holder = [];
    } else {
      holder = this.filterDataSource(dataSource, filter).map(item => item.key);
    }

    this.setState({
      [direction + 'CheckedKeys']: holder,
    });
  }

  handleFilter(direction, e) {
    this.setState({
      // deselect all
      [direction + 'CheckedKeys']: [],
      // add filter
      [direction + 'Filter']: e.target.value,
    });
  }

  handleClear(direction) {
    this.setState({
      [direction + 'Filter']: '',
    });
  }

  handleSelect(direction, selectedItem, checked) {
    const { leftCheckedKeys, rightCheckedKeys } = this.state;
    const holder = direction === 'left' ? leftCheckedKeys : rightCheckedKeys;
    const index = holder.findIndex((key) => key === selectedItem.key);
    if ( index > -1 ) {
      holder.splice(index, 1);
    }
    if ( checked ) {
      holder.push(selectedItem.key);
    }
    this.setState({
      [direction + 'CheckedKeys']: holder,
    });
  }

  render() {
    const {
      prefixCls, titles, operations, showSearch,
      searchPlaceholder, body, footer, listStyle, className,
    } = this.props;
    const { leftFilter, rightFilter, leftCheckedKeys, rightCheckedKeys } = this.state;

    const { leftDataSource, rightDataSource } = this.splitDataSource();
    const leftActive = rightCheckedKeys.length > 0;
    const rightActive = leftCheckedKeys.length > 0;

    const leftCheckStatus = this.getGlobalCheckStatus('left');
    const rightCheckStatus = this.getGlobalCheckStatus('right');

    const cls = classNames({
      [className]: !!className,
      prefixCls: true,
    });

    return <div className={cls}>
      <List titleText={titles[0]}
            dataSource={leftDataSource}
            filter={leftFilter}
            style={listStyle}
            checkedKeys={leftCheckedKeys}
            checkStatus={leftCheckStatus}
            handleFilter={this.handleFilter.bind(this, 'left')}
            handleClear={this.handleClear.bind(this, 'left')}
            handleSelect={this.handleSelect.bind(this, 'left')}
            handleSelectAll={this.handleSelectAll.bind(this, 'left')}
            position="left"
            render={this.props.render}
            showSearch={showSearch}
            searchPlaceholder={searchPlaceholder}
            body={body}
            footer={footer}
            prefixCls={prefixCls + '-list'}
      />
      <Operation rightActive={rightActive}
                 rightArrowText={operations[0]}
                 moveToRight={this.moveTo.bind(this, 'right')}
                 leftActive={leftActive}
                 leftArrowText={operations[1]}
                 moveToLeft={this.moveTo.bind(this, 'left')}
                 className={prefixCls + '-operation'}
      />
      <List titleText={titles[1]}
            dataSource={rightDataSource}
            filter={rightFilter}
            style={listStyle}
            checkedKeys={rightCheckedKeys}
            checkStatus={rightCheckStatus}
            handleFilter={this.handleFilter.bind(this, 'right')}
            handleClear={this.handleClear.bind(this, 'right')}
            handleSelect={this.handleSelect.bind(this, 'right')}
            handleSelectAll={this.handleSelectAll.bind(this, 'right')}
            position="right"
            render={this.props.render}
            showSearch={showSearch}
            searchPlaceholder={searchPlaceholder}
            body={body}
            footer={footer}
            prefixCls={prefixCls + '-list'}
      />
    </div>;
  }
}

Transfer.defaultProps = {
  prefixCls: 'ant-transfer',
  dataSource: [],
  render: noop,
  targetKeys: [],
  onChange: noop,
  titles: ['源列表', '目的列表'],
  operations: [],
  showSearch: false,
  searchPlaceholder: '请输入搜索内容',
  body: noop,
  footer: noop,
};

Transfer.propTypes = {
  prefixCls: PropTypes.string,
  dataSource: PropTypes.array,
  render: PropTypes.func,
  targetKeys: PropTypes.array,
  onChange: PropTypes.func,
  height: PropTypes.number,
  listStyle: PropTypes.object,
  className: PropTypes.string,
  titles: PropTypes.array,
  operations: PropTypes.array,
  showSearch: PropTypes.bool,
  searchPlaceholder: PropTypes.string,
  body: PropTypes.func,
  footer: PropTypes.func,
};

Transfer.List = List;
Transfer.Operation = Operation;
Transfer.Search = Search;

export default Transfer;