'use strict';

import React from 'react';
import DropdownList from 'react-widgets/lib/DropdownList';
import score from 'string-score';

class RankedDropdownList extends DropdownList.BaseDropdownList {

  constructor(...args) {
    super(...args);

    // Overwrite the DropdownList filter method (inherited from mixins/DataFilterMixin.js)
    this.filter = function (items, searchTerm) {
      // empty search string, return all items
      if (searchTerm.length == 0) return items;

      // The Waffle House of array function chains:
      //   Scored    - score search item vs item.name, wrap object around item with score property
      //   Filtered  - filter scored items, removing those with a score of 0 (zero)
      //   Sorted    - sort scored items by score value desc
      //   Stripped  - strip wrapper object returning only items
      return items
        .map(function (item) { // Scored
          return {score: score(item.name, searchTerm), value: item};
        })
        .filter(function (item) { // Filtered
          return item.score > 0;
        })
        .sort(function (a, b) { // Sorted
          return a.score >= b.score ? -1 : 1
        })
        .map(function (item) { // Stripped
          return item.value;
        });
    };
  }
}

// Extend BaseDropdownList propTypes to force requirement of the following props
// necessary for component functionality. This is required since BaseDropdownList
// does not automatically handle this functionality internally.

RankedDropdownList.propTypes = Object.assign({},
  DropdownList.propTypes,{
    open: React.PropTypes.bool.isRequired,
    searchTerm: React.PropTypes.string.isRequired,
    value: React.PropTypes.any,
    onChange: React.PropTypes.func.isRequired,
    onSearch: React.PropTypes.func.isRequired,
    onToggle: React.PropTypes.func.isRequired
  });

export default RankedDropdownList;