import {useEffect, useState} from 'react';
import {useTranslation} from 'react-i18next';

import {Dialog, DialogContent, DialogDescription, DialogTitle} from '@/components/ui/dialog';
import {Skeleton} from '@/components/ui/skeleton';
import GameRow from './stats/GameRow.jsx';
import {formatPlaytime} from '../utils/games.js';
import {fetchSyncChanges, groupByKind} from '../utils/syncChanges.js';

/**
 * The changes of the last sync, grouped by kind. Loads the result again when it opens: the achievements of a sync
 * arrive after its games.
 */
export default function SyncChangesDialog({onClose}) {
    const {t} = useTranslation();
    const [changes, setChanges] = useState(null);
    const [failed, setFailed] = useState(false);

    useEffect(() => {
        let current = true;
        fetchSyncChanges()
            .then((body) => {
                if (!current) return;
                if (body) setChanges(body.changes ?? []);
                else setFailed(true);
            })
            .catch(() => current && setFailed(true));
        return () => {
            current = false;
        };
    }, []);

    const value = (change) => {
        switch (change.kind) {
            case 'PLAYTIME': return `+${formatPlaytime(change.amount)}`;
            case 'ACHIEVEMENTS': return `+${change.amount}`;
            case 'STATUS': return `${t(`BACKLOG.STATUS.${change.fromStatus}`)} → ${t(`BACKLOG.STATUS.${change.toStatus}`)}`;
            default: return null;
        }
    };

    return (
        <Dialog open onOpenChange={(open) => !open && onClose()}>
            <DialogContent
                className="max-h-[85vh] overflow-y-auto overflow-x-hidden max-sm:top-auto max-sm:bottom-0 max-sm:max-w-full max-sm:translate-y-0 max-sm:rounded-b-none sm:max-w-xl">
                <DialogTitle className="pr-6">{t('SYNC_CHANGES.TITLE')}</DialogTitle>
                <DialogDescription className="sr-only">{t('SYNC_CHANGES.TITLE')}</DialogDescription>
                {changes === null && !failed && <Skeleton className="h-24 rounded-xl"/>}
                {failed && <p className="text-sm text-muted-foreground">{t('SYNC_CHANGES.ERROR')}</p>}
                {changes && changes.length === 0 && <p className="text-sm text-muted-foreground">{t('SYNC_CHANGES.EMPTY')}</p>}
                {changes && groupByKind(changes).map(({kind, changes: rows}) => (
                    <section key={kind} className="space-y-2">
                        <h3 className="text-sm font-semibold">{t(`SYNC_CHANGES.HEADING.${kind}`)}</h3>
                        <ul className="space-y-2">
                            {rows.map((change, index) => (
                                <li key={`${change.appid}-${change.fromStatus}-${index}`}>
                                    <GameRow game={change} value={value(change)} linked/>
                                </li>
                            ))}
                        </ul>
                    </section>
                ))}
            </DialogContent>
        </Dialog>
    );
}