import {useEffect, useRef, useState} from 'react';
import {useTranslation} from 'react-i18next';
import {Loader2, RotateCcw, Save} from 'lucide-react';
import {toast} from 'sonner';

import {Badge} from '@/components/ui/badge';
import {Button} from '@/components/ui/button';
import {Dialog, DialogContent, DialogDescription, DialogHeader, DialogTitle} from '@/components/ui/dialog';
import {Input} from '@/components/ui/input';
import {Label} from '@/components/ui/label';
import {CORRECTABLE_MOODS, IGDB_GENRES, resetCorrection, saveCorrection} from '../utils/corrections.js';
import {genreKey} from '../utils/stats.js';
import {MAX_CORRECTION_GENRES, MAX_CORRECTION_LENGTH} from '../utils/limits.js';

const REFUSAL_KEY = {INVALID_CORRECTION: 'CORRECTION.INVALID'};

const ENDLESS_CHOICES = [[null, 'UNKNOWN'], [true, 'YES'], [false, 'NO']];

const initialValues = (game) => ({
    name: game.name ?? '',
    image: game.imageUrl ?? '',
    speedrun: game.speedrunUrl ?? '',
    moods: game.moods ?? [],
    endless: game.endless ?? null,
    genres: game.genres ?? [],
});

// An empty text field means "none": the Steam header, or no speedrun.
const toValue = (value) => (typeof value === 'string' ? value.trim() || null : value);

const toggled = (list, item) => (list.includes(item) ? list.filter((each) => each !== item) : [...list, item]);

/**
 * AUDITOR or higher: corrects the shared data of one game for every user. Each field saves on its own;
 * onChanged loads the game again.
 */
export default function GameCorrectionDialog({game, open, onOpenChange, onChanged}) {
    const {t} = useTranslation();
    const [values, setValues] = useState(() => initialValues(game));
    const [busy, setBusy] = useState(null);
    // The field whose save or reset the next game from GameDetail answers; the other fields keep their edits.
    const sentField = useRef(null);

    useEffect(() => {
        if (open) setValues(initialValues(game));
        // Only when the dialog opens; a reload after a save is handled below.
        // eslint-disable-next-line react-hooks/exhaustive-deps
    }, [open]);

    useEffect(() => {
        const field = sentField.current;
        if (field) {
            sentField.current = null;
            setValues((v) => ({...v, [field]: initialValues(game)[field]}));
        }
    }, [game]);

    const corrected = new Set((game.corrections ?? []).map((c) => c.field.toLowerCase()));
    const set = (field, value) => setValues((v) => ({...v, [field]: value}));

    const send = async (field, request) => {
        setBusy(field);
        try {
            const response = await request();
            if (response.status === 401) return;
            if (response.ok) {
                toast.success(t('CORRECTION.SAVED'));
                sentField.current = field;
                onChanged?.();
                return;
            }
            const data = await response.json().catch(() => ({}));
            // Core's message is English and for developers, so it goes to the console only.
            if (data.message) console.warn('Correction refused:', data.code, data.message);
            toast.error(t(REFUSAL_KEY[data.code] ?? (response.status === 403 ? 'CORRECTION.NO_ACCESS' : 'CORRECTION.ERROR')));
        } catch (err) {
            console.error('Correction error:', err);
            toast.error(t('INFO.ERROR.NETWORK_FAILURE'));
        } finally {
            setBusy(null);
        }
    };

    const row = (field, input) => (
        <div key={field} className="space-y-2 border-b pb-4 last:border-b-0">
            <div className="flex items-center gap-2">
                <Label htmlFor={`correction-${field}`}>{t(`CORRECTION.FIELD.${field.toUpperCase()}`)}</Label>
                {corrected.has(field) && <Badge variant="outline">{t('CORRECTION.CORRECTED')}</Badge>}
            </div>
            {input}
            <div className="flex flex-wrap gap-2">
                <Button type="button" size="sm" disabled={busy !== null}
                        onClick={() => send(field, () => saveCorrection(game.appid, field, toValue(values[field])))}>
                    {busy === field ? <Loader2 className="animate-spin"/> : <Save/>}{t('CORRECTION.SAVE')}
                </Button>
                {corrected.has(field) && (
                    <Button type="button" size="sm" variant="outline" disabled={busy !== null}
                            onClick={() => send(field, () => resetCorrection(game.appid, field))}>
                        <RotateCcw/>{t('CORRECTION.BACK_TO_SOURCE')}
                    </Button>
                )}
            </div>
        </div>
    );

    const choices = (field, options, label, max = Infinity) => (
        <div id={`correction-${field}`} className="flex flex-wrap gap-2">
            {options.map((option) => (
                <Button key={option} type="button" size="sm" aria-pressed={values[field].includes(option)}
                        disabled={!values[field].includes(option) && values[field].length >= max}
                        variant={values[field].includes(option) ? 'default' : 'outline'}
                        onClick={() => set(field, toggled(values[field], option))}>
                    {label(option)}
                </Button>
            ))}
        </div>
    );

    // A genre IGDB added later still shows, so it can be removed.
    const genreOptions = [...IGDB_GENRES, ...values.genres.filter((g) => !IGDB_GENRES.includes(g))];

    return (
        <Dialog open={open} onOpenChange={onOpenChange}>
            <DialogContent className="max-h-[90vh] overflow-y-auto">
                <DialogHeader>
                    <DialogTitle>{t('CORRECTION.TITLE')}</DialogTitle>
                    <DialogDescription>{t('CORRECTION.TEXT')}</DialogDescription>
                </DialogHeader>
                <div className="space-y-4">
                    {row('name', <Input id="correction-name" value={values.name} maxLength={MAX_CORRECTION_LENGTH}
                                        onChange={(e) => set('name', e.target.value)}/>)}
                    {row('image', <Input id="correction-image" value={values.image} maxLength={MAX_CORRECTION_LENGTH}
                                         placeholder={t('CORRECTION.IMAGE_HINT')}
                                         onChange={(e) => set('image', e.target.value)}/>)}
                    {row('speedrun', <Input id="correction-speedrun" value={values.speedrun} maxLength={MAX_CORRECTION_LENGTH}
                                            placeholder={t('CORRECTION.SPEEDRUN_HINT')}
                                            onChange={(e) => set('speedrun', e.target.value)}/>)}
                    {row('moods', choices('moods', CORRECTABLE_MOODS, (mood) => t(`PLAY_NEXT.MOOD.${mood}`)))}
                    {row('endless', (
                        <div id="correction-endless" className="flex flex-wrap gap-2">
                            {ENDLESS_CHOICES.map(([choice, key]) => (
                                <Button key={key} type="button" size="sm" aria-pressed={values.endless === choice}
                                        variant={values.endless === choice ? 'default' : 'outline'}
                                        onClick={() => set('endless', choice)}>
                                    {t(`CORRECTION.ENDLESS.${key}`)}
                                </Button>
                            ))}
                        </div>
                    ))}
                    {row('genres', choices('genres', genreOptions,
                        (genre) => t(`STATS.GENRE.${genreKey(genre)}`, {defaultValue: genre}), MAX_CORRECTION_GENRES))}
                </div>
            </DialogContent>
        </Dialog>
    );
}