import React, { useState } from 'react';
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
import {
  faSearch,
  faXmark,
  faSpinner,
} from '@fortawesome/free-solid-svg-icons';
import TypeDocument from './TypeDocument';
import TypeAnswer from './TypeAnswer';
import TypeQuestionAnswer from './TypeQuestionAnswer';
import TypeNotFound from './TypeNotFound';
import { FeaturedResultsItem, QueryResultItem } from '@aws-sdk/client-kendra';
import { sendQuery } from '../lib/fetcher';
import { useForm } from 'react-hook-form';
import './ItemList.css';

const API_ENDPOINT = process.env.REACT_APP_API_ENDPOINT!;

interface Query {
  query: string;
}

function ItemList() {
  const [items, setItems] = useState<QueryResultItem[]>([]);
  const [featuredResults, setFeaturedResults] = useState<FeaturedResultsItem[]>(
    []
  );
  const [loading, setLoading] = useState(false);
  const [queryOnce, setQueryOnce] = useState(false);

  const { register, watch, handleSubmit, setValue } = useForm<Query>();

  const watchQuery = watch('query', '');

  const onSubmit = async (data: Query) => {
    if (data.query.length === 0) return;

    setQueryOnce(true);
    setLoading(true);
    setItems([]);
    setFeaturedResults([]);
    const result = await sendQuery(API_ENDPOINT, data.query);
    setItems(result.ResultItems ?? []);
    setFeaturedResults(result.FeaturedResultsItems ?? []);
    setLoading(false);
  };

  return (
    <div className="flex flex-col items-center">
      <h1 className="text-4xl my-6 text-gray-600">Kendra 検索サンプル</h1>

      <form
        className="flex items-center border border-gray-400 rounded-full py-2 px-2 w-1/2 mb-8"
        onSubmit={handleSubmit(onSubmit)}
      >
        <FontAwesomeIcon
          className="text-sm text-gray-400 ml-1 mr-2"
          icon={faSearch}
        />
        <input
          className="focus:outline-none w-full"
          type="text"
          {...register('query')}
        />

        {watchQuery.length > 0 && (
          <FontAwesomeIcon
            className="text-sm text-gray-400 mr-1 ml-2 cursor-pointer"
            icon={faXmark}
            onClick={() => {
              setValue('query', '');
            }}
          />
        )}
      </form>

      <div className="w-full border border-b-0 border-gray-400 mb-4" />

      {queryOnce &&
        !loading &&
        items.length === 0 &&
        featuredResults.length === 0 && <TypeNotFound />}

      {loading && (
        <div>
          <FontAwesomeIcon
            className="text-xl text-gray-400 rotate mt-4"
            icon={faSpinner}
          />
        </div>
      )}

      {/* 通常の検索結果より先に、FeaturedResultsを表示する */}
      {!loading &&
        featuredResults.map((item) => {
          return <TypeDocument item={item} isFeatured={true} key={item.Id} />;
        })}

      {!loading &&
        items.map((item: QueryResultItem) => {
          switch (item.Type) {
            case 'DOCUMENT':
              return <TypeDocument item={item} key={item.Id} />;
            case 'ANSWER':
              return <TypeAnswer item={item} key={item.Id} />;
            case 'QUESTION_ANSWER':
              return <TypeQuestionAnswer item={item} key={item.Id} />;
            default:
              return <>Unknown Type: {item.Type}</>;
          }
        })}
    </div>
  );
}

export default ItemList;