import * as React from 'react';
import RcMention, { Nav, toString, toEditorState, getMentions } from 'rc-editor-mention';
import classnames from 'classnames';

export interface MentionProps {
  prefixCls: string;
  suggestionStyle?: Object;
  suggestions?: Array<any>;
  onSearchChange?: Function;
  onChange?: Function;
  notFoundContent?: any;
  loading?: Boolean;
  style?: Object;
  defaultValue?: string;
  className?: string;
  multiLines?: Boolean;
}

export interface MentionState {
  suggestions?: Array<any>;
  focus?: Boolean;
}

export default class Mention extends React.Component<MentionProps, MentionState> {
  static Nav = Nav;
  static toString = toString;
  static toEditorState = toEditorState;
  static getMentions = getMentions;
  static defaultProps = {
    prefixCls: 'ant-mention',
    suggestions: [],
    notFoundContent: '无匹配结果，轻敲空格完成输入',
    loading: false,
    multiLines: false,
  };
  constructor(props) {
    super(props);
    this.state = {
      suggestions: props.suggestions,
      focus: false,
    };
  }

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

  onSearchChange(value) {
    if (this.props.onSearchChange) {
      return this.props.onSearchChange(value);
    }
    return this.defaultSearchChange(value);
  }

  onChange(editorState) {
    if (this.props.onChange) {
      this.props.onChange(editorState);
    }
  }

  defaultSearchChange(value: String): void {
    const searchValue = value.toLowerCase();
    const filteredSuggestions = this.props.suggestions.filter(
      suggestion => suggestion.toLowerCase().indexOf(searchValue) !== -1
    );
    this.setState({
      suggestions: filteredSuggestions,
    });
  }

  render() {
    const { className, prefixCls, style, multiLines, defaultValue } = this.props;
    let { notFoundContent } = this.props;

    const { suggestions, focus } = this.state;
    const cls = classnames({
      [className]: !!className,
      ['active']: focus,
    });

    if (this.props.loading) {
      notFoundContent = <i className="anticon anticon-loading"></i>;
    }

    return <RcMention
        {...this.props}
        className={cls}
        prefixCls={prefixCls}
        style={style}
        defaultValue={defaultValue}
        multiLines={multiLines}
        onSearchChange={this.onSearchChange.bind(this)}
        onChange={this.onChange.bind(this)}
        onFocus={() => this.setState({focus: true})}
        onBlur={() => this.setState({focus: false})}
        suggestions={suggestions}
        notFoundContent={notFoundContent}
      />;
  }
}