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

import {Button} from '@/components/ui/button';
import {Card} from '@/components/ui/card';
import {Label} from '@/components/ui/label';
import {Select, SelectContent, SelectItem, SelectTrigger, SelectValue} from '@/components/ui/select';
import {Textarea} from '@/components/ui/textarea';
import {cn} from '@/lib/utils';
import {STATUS_META} from './GameStatusBadge.jsx';
import {GAME_PRIORITIES, GAME_STATUSES, NO_PRIORITY, saveBacklogEntry, toBacklogRequest} from '../utils/backlog.js';
import useSessionExpired from '../hooks/useSessionExpired.js';
import {hasSession} from '../utils/auth.js';

const NOTES_MAX = 2000;

const toForm = (entry) => ({
    status: entry.status ?? 'BACKLOG',
    rating: entry.rating ?? 0,
    notes: entry.notes ?? '',
    priority: entry.priority ?? NO_PRIORITY,
});

export default function BacklogCard({game, onSaved}) {
    const {t} = useTranslation();
    const navigate = useNavigate();
    const expireSession = useSessionExpired();
    const [saved, setSaved] = useState(() => toForm(game));
    const [form, setForm] = useState(saved);

    // The PlayingHint can change the status from outside; keep the other unsaved edits.
    useEffect(() => {
        setSaved((current) => (current.status === game.status ? current : {...current, status: game.status}));
        setForm((current) => (current.status === game.status ? current : {...current, status: game.status}));
    }, [game.status]);
    const [busy, setBusy] = useState(false);

    const dirty = JSON.stringify(form) !== JSON.stringify(saved);
    const set = (field) => (value) => setForm((f) => ({...f, [field]: value}));

    const save = async () => {
        if (!hasSession()) {
            navigate('/login');
            return;
        }
        setBusy(true);
        try {
            const response = await saveBacklogEntry(game.appid, toBacklogRequest(form));
            if (response.status === 401) {
                expireSession();
                return;
            }
            if (!response.ok) {
                toast.error(t('BACKLOG.SAVE_FAILED'));
                return;
            }
            const entry = await response.json();
            const next = toForm(entry);
            setSaved(next);
            onSaved?.(entry);
            setForm(next);
            toast.success(t('BACKLOG.SAVED'));
        } catch (err) {
            console.error('backlog save error:', err);
            toast.error(t('INFO.ERROR.NETWORK_FAILURE'));
        } finally {
            setBusy(false);
        }
    };

    return (
        <Card className="p-6 gap-5">
            <h2 className="flex items-center gap-2 text-lg font-semibold">
                <ListTodo className="size-4 text-primary"/>
                {t('BACKLOG.TITLE')}
            </h2>

            <div className="grid gap-5 sm:grid-cols-3">
                <div className="space-y-2">
                    <Label htmlFor="backlog-status">{t('BACKLOG.STATUS_LABEL')}</Label>
                    <Select value={form.status} onValueChange={set('status')}>
                        <SelectTrigger id="backlog-status" className="w-full"><SelectValue/></SelectTrigger>
                        <SelectContent>
                            {GAME_STATUSES.map((s) => {
                                const {icon: Icon, text} = STATUS_META[s];
                                return (
                                    <SelectItem key={s} value={s}>
                                        <Icon className={text}/>
                                        {t(`BACKLOG.STATUS.${s}`)}
                                    </SelectItem>
                                );
                            })}
                        </SelectContent>
                    </Select>
                </div>

                <div className="space-y-2">
                    <Label htmlFor="backlog-priority">{t('BACKLOG.PRIORITY_LABEL')}</Label>
                    <Select value={form.priority} onValueChange={set('priority')}>
                        <SelectTrigger id="backlog-priority" className="w-full"><SelectValue/></SelectTrigger>
                        <SelectContent>
                            <SelectItem value={NO_PRIORITY}>{t('BACKLOG.PRIORITY.NONE')}</SelectItem>
                            {GAME_PRIORITIES.map((p) => (
                                <SelectItem key={p} value={p}>{t(`BACKLOG.PRIORITY.${p}`)}</SelectItem>
                            ))}
                        </SelectContent>
                    </Select>
                </div>

                <div className="space-y-2">
                    <Label id="backlog-rating">{t('BACKLOG.RATING_LABEL')}</Label>
                    <div role="group" aria-labelledby="backlog-rating" className="flex h-9 items-center gap-1">
                        {[1, 2, 3, 4, 5].map((n) => (
                            <button
                                key={n}
                                type="button"
                                aria-label={t('BACKLOG.RATING_STARS', {count: n})}
                                aria-pressed={form.rating === n}
                                onClick={() => set('rating')(form.rating === n ? 0 : n)}
                                className="rounded-sm p-0.5 outline-none focus-visible:ring-[3px] focus-visible:ring-ring/50"
                            >
                                <Star className={cn('size-6 transition-colors',
                                    n <= form.rating ? 'fill-amber-400 text-amber-400' : 'text-muted-foreground/40 hover:text-amber-400')}/>
                            </button>
                        ))}
                    </div>
                </div>
            </div>

            <div className="space-y-2">
                <div className="flex items-baseline justify-between">
                    <Label htmlFor="backlog-notes">{t('BACKLOG.NOTES_LABEL')}</Label>
                    <span className="text-xs text-muted-foreground tabular-nums">{form.notes.length} / {NOTES_MAX}</span>
                </div>
                <Textarea
                    id="backlog-notes"
                    rows={3}
                    maxLength={NOTES_MAX}
                    placeholder={t('BACKLOG.NOTES_PLACEHOLDER')}
                    value={form.notes}
                    onChange={(e) => set('notes')(e.target.value)}
                />
            </div>

            <div className="flex justify-end gap-2">
                <Button variant="ghost" onClick={() => setForm(saved)} disabled={!dirty || busy}>
                    {t('BACKLOG.RESET')}
                </Button>
                <Button onClick={save} disabled={!dirty || busy}>
                    {busy && <Loader2 className="animate-spin"/>}
                    {t('BACKLOG.SAVE')}
                </Button>
            </div>
        </Card>
    );
}