import {useEffect, useState} from 'react';
import {useTranslation} from 'react-i18next';
import {ArrowLeft, Link2, Loader2, Search, Send} from 'lucide-react';
import {toast} from 'sonner';

import {Button} from '@/components/ui/button';
import {Dialog, DialogContent, DialogDescription, DialogHeader, DialogTitle} from '@/components/ui/dialog';
import {Input} from '@/components/ui/input';
import GameCover from './GameCover.jsx';
import FitText from './FitText.jsx';
import {linkGames, requestLink, searchOwnGames} from '../utils/links.js';
import {MAX_LIBRARY_SEARCH_LENGTH} from '../utils/limits.js';
import {platformLabel} from '../utils/platforms.js';

const SEARCH_DEBOUNCE_MS = 300;
const KNOWN_ERRORS = new Set(['SAME_GAME', 'ALREADY_LINKED', 'PAIR_DISMISSED', 'TOO_MANY_REQUESTS', 'GAME_NOT_FOUND']);

/**
 * Picks a game of the own library that is the same game as this one. A user sends a request to the auditors; an
 * auditor links at once.
 */
export default function LinkGameDialog({game, open, onOpenChange, auditor, onDone}) {
    const {t} = useTranslation();
    const [query, setQuery] = useState('');
    const [hits, setHits] = useState([]);
    const [picked, setPicked] = useState(null);
    const [busy, setBusy] = useState(false);

    useEffect(() => {
        if (open) {
            setQuery('');
            setHits([]);
            setPicked(null);
        }
    }, [open]);

    useEffect(() => {
        if (!open || !query.trim()) {
            setHits([]);
            return undefined;
        }
        const controller = new AbortController();
        const timer = setTimeout(async () => {
            const {ok, data} = await searchOwnGames(query.trim(), controller.signal);
            if (ok && data) setHits(data.content);
        }, SEARCH_DEBOUNCE_MS);
        return () => {
            clearTimeout(timer);
            controller.abort();
        };
    }, [open, query]);

    const send = async () => {
        setBusy(true);
        try {
            const response = await (auditor ? linkGames : requestLink)(game.appid, picked.appid);
            if (response.status === 401) return;
            if (response.ok) {
                toast.success(t(auditor ? 'LINKS.LINKED' : 'LINKS.REQUESTED'));
                onOpenChange(false);
                if (auditor) onDone();
                return;
            }
            const data = await response.json().catch(() => ({}));
            toast.error(t(KNOWN_ERRORS.has(data.code) ? `LINKS.ERROR_CODES.${data.code}` : 'LINKS.ERROR'));
        } catch (err) {
            console.error('Link error:', err);
            toast.error(t('INFO.ERROR.NETWORK_FAILURE'));
        } finally {
            setBusy(false);
        }
    };

    const offered = hits.filter((hit) => hit.appid !== game.appid);

    return (
        <Dialog open={open} onOpenChange={onOpenChange}>
            <DialogContent className="max-h-[90vh] overflow-y-auto">
                <DialogHeader>
                    <DialogTitle>{t('LINKS.SAME_AS')}</DialogTitle>
                    <DialogDescription>{t('LINKS.DIALOG_HINT', {name: game.name})}</DialogDescription>
                </DialogHeader>
                {picked ? (
                    <div className="space-y-4">
                        <p className="text-sm">
                            {t(auditor ? 'LINKS.LINK_CONFIRM' : 'LINKS.REQUEST_CONFIRM', {name: game.name, other: picked.name})}
                        </p>
                        <div className="flex flex-wrap gap-2">
                            <Button type="button" variant="outline" disabled={busy} onClick={() => setPicked(null)}>
                                <ArrowLeft/>{t('MERGE.BACK')}
                            </Button>
                            <Button type="button" disabled={busy} onClick={send}>
                                {busy ? <Loader2 className="animate-spin"/> : auditor ? <Link2/> : <Send/>}
                                {t(auditor ? 'LINKS.LINK' : 'LINKS.REQUEST')}
                            </Button>
                        </div>
                    </div>
                ) : (
                    <div className="space-y-3">
                        <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" autoFocus value={query} maxLength={MAX_LIBRARY_SEARCH_LENGTH} className="pl-8"
                                   placeholder={t('LINKS.SEARCH_PLACEHOLDER')} aria-label={t('LINKS.SEARCH_PLACEHOLDER')}
                                   onChange={(e) => setQuery(e.target.value)}/>
                        </div>
                        {query.trim() && offered.length === 0 && (
                            <p className="text-sm text-muted-foreground">{t('LINKS.NO_HITS')}</p>
                        )}
                        {offered.length > 0 && (
                            <ul className="divide-y rounded-md border">
                                {offered.map((hit) => (
                                    <li key={hit.appid}>
                                        <button type="button" onClick={() => setPicked(hit)}
                                                className="flex w-full items-center gap-3 px-3 py-2 text-left transition-colors hover:bg-muted/50">
                                            <GameCover appid={hit.appid} imageUrl={hit.imageUrl} className="w-16 shrink-0"/>
                                            <span className="@container min-w-0 flex-1 text-sm font-medium"><FitText text={hit.name}/></span>
                                            {platformLabel(hit) && (
                                                <span className="text-xs text-muted-foreground">{platformLabel(hit)}</span>
                                            )}
                                        </button>
                                    </li>
                                ))}
                            </ul>
                        )}
                    </div>
                )}
            </DialogContent>
        </Dialog>
    );
}