import React, { useState, useEffect } from 'react'
import { Card } from 'react-bootstrap';
import { getSearchResults } from './TabulatorData';
import '../jqueryloader'

const Search = () => {
    const [searchTerm, updateSearchTerm] = useState('');
    const [filteredResults, updateFilteredResults] = useState([]);
    const [searchResults, updateSearchResults] = useState([]);
    const [displayResults, updateDisplayResults] = useState(false);
    const [focusIndex, updateFocusIndex] = useState(-1);
    const linkRefs = [];
    const keys = {
        ENTER: 13,
        UP: 38,
        DOWN: 40
    };

    useEffect(() => {
        const getSearchResult = () => {
            // ⚠️ This is where you should pull data in from your server
            const searchResultsResponse = getSearchResults();

            updateSearchResults(searchResultsResponse);
        };
       
        getSearchResult();
    }, []);

    const updateSearch = e => {
        var input = e.target?.value;
        updateSearchTerm(e.target.value);
        updateFilteredResults(searchResults.filter(result =>{
            if(input?.length >= 3){
                return result.title.match(new RegExp(e.target.value, 'gi'))
            }
        }))
    };

    const hideAutoSuggest = e => {
        e.persist();
        
        if (e.relatedTarget && e.relatedTarget.className === 'autosuggest-link') {
            return false;
        }
        updateDisplayResults(true);
        updateFocusIndex(-1);
    };

    const showAutoSuggest = () => {
        updateDisplayResults(false);
    };
    const handleInput = (e) =>{
        var input = e.target?.value;
        $('.search-suggestions').css('display', 'block');
        if(input?.length === 0){
            $('.search-suggestions').css('display', 'none');
        }
    }
    const handleNavigation = e => {
        switch (e.keyCode) {
            case keys.ENTER:
                if (focusIndex !== -1)  {
                    window.open(linkRefs[focusIndex].href);
                }
                hideAutoSuggest(e);
            break;
            case keys.UP:

                if (focusIndex > -1) {
                    updateFocusIndex(focusIndex - 1);
                }
            break;
            case keys.DOWN:

                if (focusIndex < filteredResults.length - 1) {
                    updateFocusIndex(focusIndex + 1);
                }
            break;
        }
    };

    const SearchResults = () => {
        const Message = ({ text }) => (
            <div className="search-results-message">
                <h2>{text}</h2>
                <hr />
            </div>
        );

        if (!displayResults) {
            return null;
        }

        if (!searchResults.length) {
            return <Message text="Loading search results" />
        }

        if (!searchTerm) {
            return <Message text="Try to search for something..." />
        }

        if (!filteredResults.length) {
            return <Message text="We couldn't find anything for your search term." />
        }

        return (
            <ul className="search-results">
                {filteredResults.map((article, index) => (
                    <li key={index}>
                        {/* ⚠️ You may want to outsource this part to make the component less heavy */}
                        <Card model={article} />
                    </li>
                ))}
            </ul>
        );
    }

    return (
        <section className="search">
            <h5>Search {searchTerm.length ? `results for: ${searchTerm}` : null}</h5>
            <input type="text"
                    placeholder="Search for tutorials..."
                    onKeyUp={updateSearch}
                    onKeyDown={handleNavigation}
                    onBlur={hideAutoSuggest}
                    onFocus={showAutoSuggest}
                    onChange={handleInput} 
                    className='inputclear'/>
            <ul className="search-suggestions">
                {(!displayResults && searchTerm) && <li key="-1" className={focusIndex === -1 ? 'active' : null}>{`Search for ${searchTerm}`}</li>}
                {!displayResults && filteredResults.map((article, index) => (
                    <li key={index} className={focusIndex === index ? 'active' : null}>
                        <div className="autosuggest-link"
                            ref={link => {linkRefs[index] = link}}>
                            <Highlight tags={searchTerm}>{article.title}</Highlight>
                        </div>
                    </li>
                ))}
            </ul>
            <SearchResults />
        </section>
    );
}

function Highlight({ children: text = "", tags }) {
    if (!tags?.length) return text;
    const matches = [...text.matchAll(new RegExp(tags, "ig"))];
    const startText = text.slice(0, matches[0]?.index);
    return (
      <span>
        {startText}
        {matches.map((match, i) => {
          const startIndex = match.index;
          const currentText = match[0];
          const endIndex = startIndex + currentText.length;
          const nextIndex = matches[i + 1]?.index;
          const untilNextText = text.slice(endIndex, nextIndex);
          return (
            <React.Fragment key={i}>
              <p><span className='text-primary'>{currentText}</span>{untilNextText}</p>
            </React.Fragment>
          );
        })}
      </span>
    );
}
export default Search;