import type { Noun } from '#shared/classes.ts';
import { genders, numeri, resolveFirstDeclension } from '#shared/nouns.ts';
import type { NounsData } from '#shared/nouns.ts';
import { getLocale, loadConfig, loadNounsData } from '~~/server/data.ts';
import { buildNoun, getNounEntries } from '~~/server/nouns.ts';

const downgradeToV1 = (noun: Noun, nounsData: NounsData) => {
    const downgradedNoun: Record<string, unknown> = {
        id: noun.id,
        sourcesData: noun.sourcesData,
        categories: noun.categories.join('|'),
        sources: noun.sources.join(','),
    };
    for (const gender of genders) {
        for (const numerus of numeri) {
            const wordSpellings = noun.words[gender]?.[numerus]
                ?.map((word) => resolveFirstDeclension(word, numerus, nounsData)) ?? [];
            downgradedNoun[gender + (numerus === 'singular' ? '' : 'Pl')] = wordSpellings.join('|');
        }
    }
    return downgradedNoun;
};

export default defineEventHandler(async (event) => {
    const locale = getLocale(event);
    checkIsConfigEnabledOr404(await loadConfig(locale), 'nouns');

    const query = getQuery(event);

    const { isGranted } = await useAuthentication(event);
    const db = useDatabase();
    const nouns = await getNounEntries(db, isGranted, locale);
    if (query.version !== '2') {
        const config = await loadConfig(locale);
        const nounsData = await loadNounsData(locale);
        return nouns
            .map((nounRaw) => buildNoun(nounRaw, config, nounsData))
            .map((noun) => downgradeToV1(noun, nounsData));
    } else {
        return nouns;
    }
});