import {useEffect, useState} from 'react';
import {useNavigate} from 'react-router-dom';
import {useTranslation} from 'react-i18next';
import {toast} from 'sonner';
import {ArrowLeft, Loader2, Plus, X} from 'lucide-react';

import {Button} from '@/components/ui/button';
import {Card} from '@/components/ui/card';
import {Input} from '@/components/ui/input';
import {Label} from '@/components/ui/label';
import {Select, SelectContent, SelectItem, SelectTrigger, SelectValue} from '@/components/ui/select';
import GameCover from './GameCover.jsx';
import FitText from './FitText.jsx';
import GameSearch from './GameSearch.jsx';
import usePointsCheck from '../hooks/usePointsCheck.js';
import useStartImport from '../hooks/useStartImport.js';
import {GAME_STATUSES, MAX_PLATFORM_LENGTH} from '../utils/limits.js';
import {addGame, hoursToMinutes} from '../utils/manualGames.js';
import {preselectPlatform} from '../utils/platforms.js';
import {useCurrentUserContext} from '../context/CurrentUserContext.jsx';

/**
 * Search IGDB and add a game the user owns outside Steam, e.g. on PlayStation or Switch; or check several and review
 * them on the import page.
 *
 * @param onAdded called with the new appid before the navigation, for a page that shows the same address
 * @param initialQuery the search text to start with, e.g. the name of a game seen elsewhere
 */
export default function AddGamePanel({onClose, onAdded, initialQuery = ''}) {
    const {t} = useTranslation();
    const navigate = useNavigate();
    const [query, setQuery] = useState(initialQuery);
    const [picked, setPicked] = useState(null);
    // igdbId -> hit, over several searches.
    const [selected, setSelected] = useState(() => new Map());
    const [busy, setBusy] = useState(false);
    const favorite = useCurrentUserContext().user?.settings?.favoritePlatform ?? null;
    const startImport = useStartImport();

    const toggle = (hit) => {
        const next = new Map(selected);
        if (!next.delete(hit.igdbId)) next.set(hit.igdbId, hit);
        setSelected(next);
    };

    // Several games go through a SEARCH import: its review picks the platforms, and it can be undone.
    const reviewSelected = async () => {
        setBusy(true);
        const id = await startImport('SEARCH', [...selected.values()]
            .map((hit) => ({igdbId: hit.igdbId, title: hit.name.slice(0, 100)})));
        setBusy(false);
        if (id) navigate(`/import?id=${id}`);
    };

    return (
        <Card className="p-5 gap-4">
            <div className="flex items-center justify-between gap-3">
                <h2 className="flex items-center gap-2 font-semibold">
                    <Plus className="size-4 text-primary"/>
                    {t('MANUAL_GAME.ADD_TITLE')}
                </h2>
                <Button variant="ghost" size="icon" onClick={onClose} aria-label={t('MANUAL_GAME.CLOSE')}>
                    <X/>
                </Button>
            </div>

            {picked ? (
                <AddForm hit={picked} favorite={favorite} onBack={() => setPicked(null)} navigate={navigate}
                         onAdded={onAdded}/>
            ) : (
                <>
                    <p className="text-sm text-muted-foreground">{t('MANUAL_GAME.ADD_HINT')}</p>
                    <GameSearch query={query} onQueryChange={setQuery} onPick={setPicked} blockInLibrary
                                selected={selected} onToggle={toggle}/>
                    {selected.size > 0 && (
                        <div className="flex flex-wrap items-center justify-between gap-3">
                            <span className="text-sm text-muted-foreground">{t('MANUAL_GAME.SELECTED', {count: selected.size})}</span>
                            <Button onClick={reviewSelected} disabled={busy}>
                                {busy ? <Loader2 className="animate-spin"/> : <Plus/>}{t('MANUAL_GAME.ADD_SELECTED')}
                            </Button>
                        </div>
                    )}
                </>
            )}
        </Card>
    );
}

function AddForm({hit, favorite, onBack, navigate, onAdded}) {
    const {t} = useTranslation();
    const [platform, setPlatform] = useState(() => preselectPlatform(null, hit.platforms, favorite));
    // The favorite can arrive after the pick; it fills only a platform the user has not picked yet.
    useEffect(() => {
        setPlatform((current) => current || preselectPlatform(null, hit.platforms, favorite));
    }, [favorite, hit.platforms]);
    const [status, setStatus] = useState('BACKLOG');
    const [hours, setHours] = useState('');
    const [busy, setBusy] = useState(false);
    const check = usePointsCheck();

    const submit = async (e) => {
        e.preventDefault();
        setBusy(true);
        try {
            const response = await addGame({
                igdbId: hit.igdbId, platform: platform.trim(), status, playtimeMinutes: hoursToMinutes(hours),
            });
            if (response.status === 401) return;
            if (response.status === 409) {
                toast.error(t('MANUAL_GAME.ALREADY_IN_LIBRARY'));
                return;
            }
            if (!response.ok) {
                toast.error(t('MANUAL_GAME.ADD_FAILED'));
                return;
            }
            const {appid} = await response.json();
            toast.success(t('MANUAL_GAME.ADDED', {name: hit.name}));
            check(appid, {status, tell: true});
            onAdded?.(appid);
            navigate(`/library/${appid}`);
        } catch (err) {
            console.error('add game error:', err);
            toast.error(t('INFO.ERROR.NETWORK_FAILURE'));
        } finally {
            setBusy(false);
        }
    };

    return (
        <form onSubmit={submit} className="space-y-4">
            <div className="flex items-center gap-3">
                <GameCover appid={hit.appid} imageUrl={hit.imageUrl} className="w-24 shrink-0"/>
                <div className="@container min-w-0 flex-1 font-medium">
                    <FitText text={`${hit.name}${hit.year ? ` (${hit.year})` : ''}`}/>
                </div>
            </div>
            <div className="grid gap-4 sm:grid-cols-3">
                <div className="space-y-2">
                    <Label htmlFor="add-platform">{t('MANUAL_GAME.PLATFORM')}</Label>
                    {hit.platforms.length > 0 ? (
                        <Select value={platform} onValueChange={setPlatform}>
                            <SelectTrigger id="add-platform" className="w-full">
                                <SelectValue placeholder={t('IMPORT.PICK_PLATFORM')}/>
                            </SelectTrigger>
                            <SelectContent>
                                {hit.platforms.map((p) => <SelectItem key={p} value={p}>{p}</SelectItem>)}
                            </SelectContent>
                        </Select>
                    ) : (
                        <Input id="add-platform" value={platform} maxLength={MAX_PLATFORM_LENGTH} onChange={(e) => setPlatform(e.target.value)}/>
                    )}
                </div>
                <div className="space-y-2">
                    <Label htmlFor="add-status">{t('BACKLOG.STATUS_LABEL')}</Label>
                    <Select value={status} onValueChange={setStatus}>
                        <SelectTrigger id="add-status" className="w-full"><SelectValue/></SelectTrigger>
                        <SelectContent>
                            {GAME_STATUSES.map((s) => <SelectItem key={s} value={s}>{t(`BACKLOG.STATUS.${s}`)}</SelectItem>)}
                        </SelectContent>
                    </Select>
                </div>
                <div className="space-y-2">
                    <Label htmlFor="add-hours">{t('MANUAL_GAME.HOURS')}</Label>
                    <Input id="add-hours" type="number" min="0" step="0.5" inputMode="decimal" value={hours}
                           onChange={(e) => setHours(e.target.value)}/>
                </div>
            </div>
            <div className="flex justify-between gap-3">
                <Button type="button" variant="ghost" onClick={onBack} disabled={busy}>
                    <ArrowLeft/>{t('MANUAL_GAME.BACK_TO_SEARCH')}
                </Button>
                <Button type="submit" disabled={busy || !platform.trim()}>
                    {busy && <Loader2 className="animate-spin"/>}
                    <Plus/>{t('MANUAL_GAME.ADD')}
                </Button>
            </div>
        </form>
    );
}