// @flow
import React from 'react';
import ReactDOM from 'react-dom';
import { Component, PropTypes } from '../../libs';
import { getScrollBarWidth } from './utils';
import Checkbox from '../checkbox';

import type {
  TableBodyProps,
  TableBodyState,
  TableBodyItemProps,
  TableBodyItemState
} from './Types';

class BodyItem extends Component{
  props: TableBodyItemProps;
  state: TableBodyItemState;

  constructor(props, context){
    super(props, context);
    this.state = {
      hover: false,
      expand: false
    };
  }

  onMouseState(hover){
    const {
      fixedLeftBody,
      mainBody,
      fixedRightBody
    } = this.context.$owerTable.refs;

    fixedLeftBody && fixedLeftBody.hoverRowItem(this.props.rowIndex, hover);
    mainBody && mainBody.hoverRowItem(this.props.rowIndex, hover);
    fixedRightBody && fixedRightBody.hoverRowItem(this.props.rowIndex, hover);
  }

  setHoverState(hover){
    this.setState({
      hover: hover
    });
  }

  onToggleSelectedRow(isHiglight, dataItem){
    const {
      fixedLeftBody,
      mainBody,
      fixedRightBody
    } = this.context.$owerTable.refs;

    fixedLeftBody && fixedLeftBody.toggleSelectedRow(isHiglight, dataItem);
    mainBody && mainBody.toggleSelectedRow(isHiglight, dataItem);
    fixedRightBody && fixedRightBody.toggleSelectedRow(isHiglight, dataItem);

    const tableProps = this.context.$owerTable.props;
    tableProps.highlightCurrentRow && tableProps.onCurrentChange && tableProps.onCurrentChange(dataItem);
  }

  onChange(checked){
    const { onSelected, itemData } = this.props;
    onSelected && onSelected(checked, itemData);
  }

  onExpand(){
    const { expand } = this.state;
    const { root } = this.refs;

    this.setState({
      expand: !expand
    });

    if(!expand){
      const table = root.parentNode.parentNode;
      const index = Array.prototype.slice.apply(
        root.parentNode.childNodes,
        [0, root.parentNode.childNodes.length]
      ).indexOf(root);
      const row = table.insertRow(index + 1);
      const td = document.createElement('td');

      td.colSpan = this.props.columns.length;
      td.className = 'el-table__expanded-cell';
      row.appendChild(td);

      ReactDOM.render(this.props.columns[0].expandPannel(this.props.itemData), td);
    }else{
      root.parentNode.removeChild(root.nextElementSibling);
    }
  }

  render(){
    const {
      itemData,
      rowIndex,
      rowClassName,
      isHiglight,
      selected,
      leafColumns
    } = this.props;

    const classSet:Object = {
      'hover-row': this.state.hover,
      'current-row': isHiglight,
      'el-table__row--striped': this.context.stripe && rowIndex % 2 !== 0,
    };

    if(rowClassName){
      const clasName = rowClassName(itemData, rowIndex);
      classSet[clasName] = true;
    }

    const rootClassName = this.classNames(classSet);
    const epxandClass = this.classNames({
      'el-table__expand-icon': true,
      'el-table__expand-icon--expanded': this.state.expand
    });

    return (
      <tr
        ref="root"
        onClick={()=>{this.onToggleSelectedRow(!isHiglight, itemData)}}
        className={rootClassName}
        onMouseEnter={()=>{this.onMouseState(true)}}
        onMouseLeave={()=>{this.onMouseState(false)}}>
        {
          leafColumns.map((column, idx)=>{
            let content;
            if(column.render){
              content = column.render(itemData, column);
            }else{
              content = itemData[column.property];
            }
            const className = this.classNames({
              'is-hidden': !this.props.fixed && column.fixed,
              'is-center': column.align == 'center',
              'is-right' : column.align == 'right'
            });
            return (
              <td
                key={idx}
                className={className}
                style={{width: column.realWidth}}>
                {
                  column.type == 'selection' &&
                    <div className="cell">
                      <Checkbox
                        checked={selected}
                        onChange={(e)=>this.onChange(e)} />
                    </div>
                }
                {
                  column.type == 'index' &&
                    <div className="cell">
                      {rowIndex+1}
                    </div>
                }
                { column.type == 'expand' &&
                  <div className="cell">
                    <div
                      ref="expand"
                      className={epxandClass}
                      onClick={this.onExpand.bind(this)}>
                      <i className="el-icon el-icon-arrow-right"></i>
                    </div>
                  </div>
                }

                { column.type != 'selection' &&
                   column.type != 'index' &&
                   column.type != 'expand' &&
                   <div className="cell">{ content }</div>
                }
              </td>
            )
          })
        }
      </tr>
    )
  }
}


BodyItem.contextTypes = {
  $owerTable: PropTypes.object,
  stripe: PropTypes.bool,
};

export default class TableBody extends  Component{
  props: TableBodyProps;
  state: TableBodyState;

  constructor(props: TableBodyProps, context: Object){
    super(props, context);
    this.rowPrefix = props.fixed + 'TableRow';

    this.state = {
      highlightRows: [],
      selected: []
    }
  }

  toggleSelectedRow(isHiglight: boolean, rowData: Object){
    const { highlightCurrentRow } = this.props;
    if(!highlightCurrentRow){
      return;
    }
    this.setState({
      highlightRows: isHiglight?[rowData]:[]
    });
  }

  hoverRowItem(rowIndex: number, hover: boolean){
    var rcRowElement = this.refs[this.rowPrefix + rowIndex ];
    rcRowElement.setHoverState(hover);
  }

  isScrollY(){
    const tableBodyWrapper = this.context.$owerTable.refs.bodyWrapper;
    const contentHeight = tableBodyWrapper.offsetHeight - (this.isScrollX() ? getScrollBarWidth() : 0);
    return contentHeight < this.refs.root.offsetHeight;
  }

  isScrollX(){
    const tableBodyWrapper = this.context.$owerTable.refs.bodyWrapper;
    return tableBodyWrapper.offsetWidth < this.refs.root.offsetWidth;
  }

  onSelected(checked: boolean, data: Object){
    const { selected } = this.state;
    const dataList = this.props.data;
    const { onSelectChange } = this.context.$owerTable.props;

    checked ? selected.push(data) : selected.splice(selected.indexOf(data), 1);

    this.context.$owerTable.refs.header.setState({allChecked : dataList.length == selected.length});
    this.setState({ selected });

    onSelectChange && onSelectChange(data, checked);
  }

  selectAll(checked: boolean){
    const { data } = this.props;
    const { onSelectAll } = this.context.$owerTable.props;

    this.setState({selected: checked ? data.slice(0) : []});
    onSelectAll && onSelectAll(checked ? data : [], checked);
  }

  clearSelect() {
    this.setState({ selected: [] });
  }

  render() {
    const {
      columns,
      data,
      rowClassName,
      fixed,
      flattenColumns
    } = this.props;

    const { highlightRows, selected } = this.state;
    const rowPrefix = this.rowPrefix;
    const { leafColumns } = flattenColumns;

    return (
      <table
        ref="root"
        style={this.style()}
        className={this.classNames('el-table__body')}
        cellPadding={0}
        cellSpacing={0}
      >
        <tbody>
          {
            data.map((dataItem, dataIdx)=>{
              const refId = rowPrefix + dataIdx;
              const isHiglight = (highlightRows[0] == dataItem);
              return (
                <BodyItem
                  fixed={fixed}
                  onSelected={(c, d)=>{this.onSelected(c, d)}}
                  selected={selected.indexOf(dataItem) > -1}
                  key={dataIdx}
                  ref={refId}
                  isHiglight={isHiglight}
                  rowIndex={dataIdx}
                  rowClassName={rowClassName}
                  itemData={dataItem}
                  leafColumns={leafColumns}
                  columns={columns}
                />
              )
            })
          }
        </tbody>
      </table>
    )
  }
}

TableBody.contextTypes = {
  $owerTable: PropTypes.object,
};