import {useCallback, useEffect, useRef, useState} from 'react';
import {useSearchParams} from 'react-router-dom';
import {useTranslation} from 'react-i18next';
import {ChevronLeft, ChevronRight, Loader2, Search} from 'lucide-react';
import {toast} from 'sonner';

import {Button} from '@/components/ui/button';
import {Card, CardContent, CardHeader, CardTitle} from '@/components/ui/card';
import {Input} from '@/components/ui/input';
import GameCorrectionDialog from '../components/GameCorrectionDialog.jsx';
import GameCover from '../components/GameCover.jsx';
import FitText from '../components/FitText.jsx';
import PageContainer from '../components/PageContainer.jsx';
import {fetchCatalogGame, searchCatalog} from '../utils/corrections.js';
import {MAX_LIBRARY_SEARCH_LENGTH} from '../utils/limits.js';

const PAGE_SIZE = 20;
const SEARCH_DEBOUNCE_MS = 300;

/**
 * AUDITOR or higher: finds any game some user has and opens the correction dialog for it. ?appid= opens a game
 * directly (the audit log links here). Core checks the role.
 */
export default function GameCatalogPage() {
    const {t} = useTranslation();
    const [params, setParams] = useSearchParams();
    const openAppid = params.get('appid');
    const [query, setQuery] = useState('');
    const [term, setTerm] = useState('');
    const [page, setPage] = useState(0);
    const [result, setResult] = useState({content: [], totalPages: 0});
    const [status, setStatus] = useState('loading');
    const [detail, setDetail] = useState(null);
    const [reloads, setReloads] = useState(0);
    // The answer for a game that is no longer the open one (Esc before it came) is dropped.
    const openRef = useRef(openAppid);
    useEffect(() => {
        openRef.current = openAppid;
    }, [openAppid]);

    useEffect(() => {
        const timer = setTimeout(() => {
            if (query.trim() !== term) {
                setTerm(query.trim());
                setPage(0);
            }
        }, SEARCH_DEBOUNCE_MS);
        return () => clearTimeout(timer);
    }, [query, term]);

    useEffect(() => {
        const controller = new AbortController();
        (async () => {
            try {
                const response = await searchCatalog({q: term, page, size: PAGE_SIZE}, controller.signal);
                if (response.status === 401) return;
                if (response.status === 403) {
                    setStatus('forbidden');
                    return;
                }
                if (!response.ok) {
                    setStatus('error');
                    return;
                }
                setResult(await response.json());
                setStatus('ready');
            } catch (err) {
                if (err.name === 'AbortError') return;
                console.error('Catalog error:', err);
                setStatus('error');
            }
        })();
        return () => controller.abort();
    }, [term, page, reloads]);

    const close = useCallback(() => {
        setDetail(null);
        setParams({}, {replace: true});
    }, [setParams]);

    const loadDetail = useCallback(async (appid) => {
        try {
            const response = await fetchCatalogGame(appid);
            if (response.status === 401 || String(appid) !== openRef.current) return;
            if (response.ok) {
                setDetail(await response.json());
                return;
            }
            // 404: the game was merged meanwhile.
            toast.error(t(response.status === 404 ? 'CATALOG.GONE' : 'CATALOG.LOAD_ERROR'));
            close();
            setReloads((n) => n + 1);
        } catch (err) {
            console.error('Catalog game error:', err);
            toast.error(t('INFO.ERROR.NETWORK_FAILURE'));
            close();
        }
    }, [close, t]);

    useEffect(() => {
        if (openAppid) loadDetail(openAppid);
        else setDetail(null);
    }, [openAppid, loadDetail]);

    const changed = () => {
        loadDetail(detail.appid);
        setReloads((n) => n + 1);
    };

    if (status === 'forbidden') {
        return (
            <PageContainer className="px-4 py-6 md:px-8">
                <p className="text-sm text-muted-foreground">{t('CATALOG.NO_ACCESS')}</p>
            </PageContainer>
        );
    }

    return (
        <PageContainer className="space-y-4 px-4 py-6 md:px-8">
            <Card>
                <CardHeader className="space-y-3">
                    <CardTitle>{t('CATALOG.TITLE')}</CardTitle>
                    <div className="relative">
                        <Search className="pointer-events-none absolute left-2.5 top-1/2 size-4 -translate-y-1/2 text-muted-foreground"/>
                        <Input type="search" value={query} maxLength={MAX_LIBRARY_SEARCH_LENGTH} className="pl-8"
                               placeholder={t('CATALOG.SEARCH')} aria-label={t('CATALOG.SEARCH')}
                               onChange={(e) => setQuery(e.target.value)}/>
                    </div>
                </CardHeader>
                <CardContent className="space-y-3">
                    {status === 'loading' && <Loader2 className="size-5 animate-spin text-muted-foreground"/>}
                    {status === 'error' && <p className="text-sm text-destructive">{t('CATALOG.LOAD_ERROR')}</p>}
                    {status === 'ready' && result.content.length === 0 && (
                        <p className="text-sm text-muted-foreground">{t('CATALOG.EMPTY')}</p>
                    )}
                    {status === 'ready' && result.content.length > 0 && (
                        <ul className="divide-y">
                            {result.content.map((game) => (
                                <li key={game.appid} className="flex items-center gap-3 py-2">
                                    <GameCover appid={game.appid} imageUrl={game.imageUrl} className="w-20 shrink-0"/>
                                    <div className="@container min-w-0 flex-1">
                                        <p className="text-sm font-medium"><FitText text={game.name}/></p>
                                        <p className="text-xs text-muted-foreground">
                                            {game.platforms.join(', ')} · {t('CATALOG.KEY', {appid: game.appid})}
                                        </p>
                                    </div>
                                    <Button type="button" size="sm" variant="outline"
                                            onClick={() => setParams({appid: String(game.appid)})}>
                                        {t('CATALOG.CORRECT')}
                                    </Button>
                                </li>
                            ))}
                        </ul>
                    )}
                    {status === 'ready' && result.totalPages > 1 && (
                        <div className="flex items-center justify-between gap-2 text-sm">
                            <Button type="button" variant="outline" size="sm" disabled={page === 0}
                                    onClick={() => setPage(page - 1)}>
                                <ChevronLeft/>{t('ADMIN.PREVIOUS')}
                            </Button>
                            <span>{t('AUDIT.PAGE_OF', {current: page + 1, total: result.totalPages})}</span>
                            <Button type="button" variant="outline" size="sm" disabled={page + 1 >= result.totalPages}
                                    onClick={() => setPage(page + 1)}>
                                {t('ADMIN.NEXT')}<ChevronRight/>
                            </Button>
                        </div>
                    )}
                </CardContent>
            </Card>
            {detail && (
                <GameCorrectionDialog game={detail} open onOpenChange={(open) => !open && close()} onChanged={changed}/>
            )}
        </PageContainer>
    );
}