import React from 'react';
import classNames from 'classnames';
import HeadlineGroup from './HeadlineGroup';
import HeroHeadline from './HeroHeadline';
import Badge from './Badge';
import Link from './Link';
import Search from './Search';
import Fadeable from './Fadeable';
import { groupByFirstLetter } from '../../common/model';
import { translate } from '../../common/config';

const rings = ['all', 'assess', 'trial', 'hold', 'adopt'];

const containsSearchTerm = (text = '', term = '') => {
  // TODO search refinement
  return text.trim().toLocaleLowerCase().indexOf(term.trim().toLocaleLowerCase()) !== -1;
}

class PageOverview extends React.Component {

  constructor(...args) {
    super(...args);
    this.state = {
      ring: rings[0],
      search: '',
    };
  }

  handleRingClick = (ring) => (e) => {
    e.preventDefault();

    this.setState({
      ring,
    });
  }

  isRingActive(ringName) {
    return this.state.ring === ringName;
  }

  itemMatchesRing = (item) => {
    return this.state.ring === 'all' || item.ring === this.state.ring;
  };

  itemMatchesSearch = (item) => {
    return this.state.search.trim() === '' ||
      containsSearchTerm(item.title, this.state.search) ||
      containsSearchTerm(item.body, this.state.search) ||
      containsSearchTerm(item.info, this.state.search);
  };

  isItemVisible = (item) => {
    return this.itemMatchesRing(item) && this.itemMatchesSearch(item);
  };

  getFilteredAndGroupedItems() {
    const groups = groupByFirstLetter(this.props.items);
    const groupsFiltered = groups.map(group => ({
      ...group,
      items: group.items.filter(this.isItemVisible),
    }));
    const nonEmptyGroups = groupsFiltered.filter(group => group.items.length > 0);
    return nonEmptyGroups;
  }

  handleSearchTermChange = (value) => {
    this.setState({
      search: value,
    });
  };

  render() {
    const groups = this.getFilteredAndGroupedItems();

    return (
      <Fadeable leaving={this.props.leaving} onLeave={this.props.onLeave}>
        <HeadlineGroup>
          <HeroHeadline>Technologies Overview</HeroHeadline>
        </HeadlineGroup>
        <div className="filter">
          <div className="split">
            <div className="split__left">
              <Search onChange={this.handleSearchTermChange} value={this.state.search} />
            </div>
            <div className="split__right">
              <div className="nav">
                {
                  rings.map(ringName => (
                    <div className="nav__item" key={ringName}>
                      <Badge
                        big
                        onClick={this.handleRingClick(ringName)}
                        type={this.isRingActive(ringName) ? ringName : 'empty' }
                      >
                        {ringName}
                      </Badge>
                    </div>
                  ))
                }
              </div>
            </div>
          </div>
        </div>

        <div className="letter-index">
          {
            groups.map(({ letter, items }) => (
              <div key={letter} className="letter-index__group">
                <div className="letter-index__letter">{letter}</div>
                <div className="letter-index__items">
                  <div className="item-list">
                    <div className="item-list__list">
                      {
                        items.map((item) => (
                          <Link
                            key={item.name}
                            className="item item--big item--no-leading-border item--no-trailing-border"
                            pageName={`${item.quadrant}/${item.name}`}
                          >
                            <div className="split split--overview">
                              <div className="split__left">
                                <div className="item__title">{item.title}</div>
                              </div>
                              <div className="split__right">
                                <div className="nav">
                                  <div className="nav__item">{translate(item.quadrant)}</div>
                                  <div className="nav__item">
                                    <Badge type={item.ring}>{item.ring}</Badge>
                                  </div>
                                </div>
                              </div>
                            </div>
                          </Link>
                        ))
                      }
                    </div>
                  </div>
                </div>
              </div>
            ))
          }

        </div>
      </Fadeable>
    );
  }
}

export default PageOverview;