import {useEffect, useState} from 'react';
import {Link, useParams} from 'react-router-dom';
import {useTranslation} from 'react-i18next';
import {CircleCheck, Clock, Gamepad2, Library, Percent, Star, Trophy, UserRoundX} from 'lucide-react';

import {Card} from '@/components/ui/card';
import {Skeleton} from '@/components/ui/skeleton';
import GameCover from '../components/GameCover.jsx';
import GameStatusBadge, {STATUS_META} from '../components/GameStatusBadge.jsx';
import {GAME_STATUSES} from '../utils/backlog.js';
import {formatPlaytime} from '../utils/games.js';
import PageContainer from '../components/PageContainer.jsx';
import PileStats from '../components/stats/PileStats.jsx';
import TrendStats from '../components/stats/TrendStats.jsx';
import TopGamesStats from '../components/stats/TopGamesStats.jsx';
import TasteStats from '../components/stats/TasteStats.jsx';
import HabitsStats from '../components/stats/HabitsStats.jsx';
import FinishedStats from '../components/stats/FinishedStats.jsx';

/**
 * Public, no login. Auth returns a short-lived ticket for a public profile; Core returns the data for it.
 */
export default function PublicProfilePage() {
    const {t, i18n} = useTranslation();
    const {name} = useParams();
    const [profile, setProfile] = useState(null);
    const [library, setLibrary] = useState(null);
    const [error, setError] = useState(null);

    useEffect(() => {
        let cancelled = false;
        setProfile(null);
        setLibrary(null);
        setError(null);
        (async () => {
            try {
                const profileResponse = await fetch(
                    `${import.meta.env.VITE_API_URL}/api/public/profiles/${encodeURIComponent(name)}`);
                if (cancelled) return;
                if (profileResponse.status === 404) {
                    setError(t('PROFILE.NOT_FOUND'));
                    return;
                }
                if (!profileResponse.ok) {
                    setError(t('PROFILE.ERROR_LOAD'));
                    return;
                }
                const found = await profileResponse.json();
                const libraryResponse = await fetch(`${import.meta.env.VITE_CORE_API_URL}/api/public/profiles/library`, {
                    headers: {'X-Profile-Ticket': found.ticket},
                });
                if (cancelled) return;
                if (!libraryResponse.ok) {
                    setError(t('PROFILE.ERROR_LOAD'));
                    return;
                }
                const data = await libraryResponse.json();
                if (!cancelled) {
                    setProfile(found);
                    setLibrary(data);
                }
            } catch (err) {
                console.error('Public profile load error:', err);
                if (!cancelled) setError(t('INFO.ERROR.NETWORK_FAILURE'));
            }
        })();
        return () => {
            cancelled = true;
        };
    }, [name, t]);

    if (error) {
        return (
            <PageContainer className="p-4 md:p-8">
                <Card className="items-center py-16 text-center text-muted-foreground">
                    <UserRoundX className="size-10"/>
                    <p className="max-w-sm text-sm">{error}</p>
                    <Link to="/" className="text-sm font-medium text-primary hover:underline">{t('PROFILE.TO_START')}</Link>
                </Card>
            </PageContainer>
        );
    }

    if (!library) {
        return (
            <PageContainer className="p-4 md:p-8 space-y-6">
                <Skeleton className="h-36 rounded-xl"/>
                <Skeleton className="h-64 rounded-xl"/>
            </PageContainer>
        );
    }

    const finishedCount = (library.byStatus.FINISHED ?? 0) + (library.byStatus.COMPLETED ?? 0);
    const stats = [
        [Library, library.totalGames.toLocaleString(i18n.language), t('PROFILE.GAMES')],
        [Clock, formatPlaytime(library.totalPlaytimeMinutes), t('PROFILE.PLAYTIME')],
        [CircleCheck, finishedCount.toLocaleString(i18n.language), t('PROFILE.FINISHED')],
    ];
    if (library.averageCompletion != null) {
        stats.push(
            [Trophy, (library.perfectGames ?? 0).toLocaleString(i18n.language), t('PROFILE.PERFECT_GAMES')],
            [Percent, `${library.averageCompletion.toLocaleString(i18n.language)} %`, t('PROFILE.AVERAGE_COMPLETION')],
        );
    }
    const memberSince = profile.memberSince
        ? new Date(`${profile.memberSince}T12:00:00`).toLocaleDateString(i18n.language, {year: 'numeric', month: 'long'})
        : null;

    return (
        <PageContainer className="p-4 md:p-8 space-y-6">
            <Card className="relative overflow-hidden p-6 md:p-8 gap-6">
                <div className="pointer-events-none absolute inset-0 bg-gradient-to-br from-primary/15 via-transparent to-transparent"/>
                <div className="relative">
                    <p className="text-sm font-medium text-muted-foreground">{t('PROFILE.TITLE')}</p>
                    <h1 className="mt-1 text-3xl md:text-4xl font-bold tracking-tight break-words">{profile.displayName}</h1>
                    {memberSince && (
                        <p className="mt-2 text-sm text-muted-foreground">{t('PROFILE.MEMBER_SINCE', {date: memberSince})}</p>
                    )}
                </div>
                <div className={`relative grid gap-3 ${stats.length > 3 ? 'grid-cols-2 sm:grid-cols-5' : 'grid-cols-3'}`}>
                    {stats.map(([Icon, value, label]) => (
                        <div key={label} className="rounded-lg bg-muted/50 p-3 text-center">
                            <Icon className="mx-auto mb-1 size-4 text-primary"/>
                            <div className="text-xl md:text-2xl font-bold tabular-nums">{value}</div>
                            <div className="text-xs text-muted-foreground">{label}</div>
                        </div>
                    ))}
                </div>
                {library.totalGames > 0 && (
                    <div className="relative space-y-2">
                        <div className="flex h-2.5 overflow-hidden rounded-full bg-muted">
                            {GAME_STATUSES.map((s) => (
                                <div key={s} className={STATUS_META[s].bar}
                                     style={{width: `${((library.byStatus[s] ?? 0) / library.totalGames) * 100}%`}}/>
                            ))}
                        </div>
                        <ul className="flex flex-wrap gap-x-4 gap-y-1 text-xs text-muted-foreground">
                            {GAME_STATUSES.map((s) => (
                                <li key={s} className="flex items-center gap-1.5">
                                    <span className={`size-2 rounded-full ${STATUS_META[s].bar}`}/>
                                    {t(`BACKLOG.STATUS.${s}`)}
                                    <span className="tabular-nums text-foreground">{library.byStatus[s] ?? 0}</span>
                                </li>
                            ))}
                        </ul>
                    </div>
                )}
            </Card>

            {library.playing.length > 0 && (
                <Card className="gap-4 p-5">
                    <h2 className="flex items-center gap-2 font-semibold">
                        <Gamepad2 className="size-4 text-primary"/>{t('PROFILE.PLAYING')}
                    </h2>
                    <ul className="grid grid-cols-2 gap-3 sm:grid-cols-4">
                        {library.playing.map((g) => (
                            <li key={g.appid} className="space-y-1.5">
                                <GameCover appid={g.appid} imageUrl={g.imageUrl} className="w-full"/>
                                <div className="truncate text-sm font-medium">{g.name ?? `App ${g.appid}`}</div>
                                <div className="text-xs text-muted-foreground tabular-nums">{formatPlaytime(g.playtimeMinutes)}</div>
                            </li>
                        ))}
                    </ul>
                </Card>
            )}

            {library.finished.length > 0 && (
                <Card className="gap-0 py-0">
                    <h2 className="flex items-center gap-2 border-b px-5 py-4 font-semibold">
                        <CircleCheck className="size-4 text-emerald-500"/>{t('PROFILE.FINISHED_GAMES')}
                    </h2>
                    <ul className="divide-y">
                        {library.finished.map((g) => (
                            <li key={g.appid} className="flex items-center gap-3 sm:gap-4 px-4 sm:px-5 py-3">
                                <GameCover appid={g.appid} imageUrl={g.imageUrl} className="w-16 sm:w-24 shrink-0"/>
                                <span className="min-w-0 flex-1 truncate font-medium">{g.name ?? `App ${g.appid}`}</span>
                                {g.rating && (
                                    <span className="flex items-center gap-0.5" aria-label={t('BACKLOG.RATING_STARS', {count: g.rating})}>
                                        {Array.from({length: g.rating}, (_, i) => (
                                            <Star key={i} className="size-3.5 fill-amber-400 text-amber-400"/>
                                        ))}
                                    </span>
                                )}
                                <GameStatusBadge status={g.status} compact/>
                            </li>
                        ))}
                    </ul>
                </Card>
            )}

            {library.stats && <SharedStats stats={library.stats}/>}
        </PageContainer>
    );
}

// Only the groups the user shares come back; the game rows do not link, the library pages are private.
function SharedStats({stats}) {
    return (
        <div className="grid gap-6 md:grid-cols-2">
            {stats.pile && <PileStats pile={stats.pile} linked={false}/>}
            {stats.trend && <TrendStats trend={stats.trend}/>}
            {stats.topGames && <TopGamesStats topGames={stats.topGames} linked={false}/>}
            {stats.taste && <TasteStats taste={stats.taste}/>}
            {stats.habits && <HabitsStats habits={stats.habits}/>}
            {stats.finished && <FinishedStats finished={stats.finished}/>}
        </div>
    );
}