/* eslint-disable camelcase */
import SQL from 'sql-template-strings';

import { loadWords, Noun } from '#shared/classes.ts';
import type { NounRaw } from '#shared/classes.ts';
import { clearKey, PermissionAreas } from '#shared/helpers.ts';
import { addWordsFromClassInstance } from '#shared/nouns.ts';
import type { NounsData } from '#shared/nouns.ts';
import type { User } from '#shared/user.ts';
import type { Config } from '~~/locale/config.ts';
import type { Database } from '~~/server/db.ts';
import type { UserRow } from '~~/server/express/user.ts';
import type { SourceRow } from '~~/server/sources.ts';
import type { IsGrantedFn } from '~~/server/utils/useAuthentication.ts';

export interface NounRow {
    id: string;
    key: string;
    words: string;
    classInstance: string | null;
    approved: number;
    base_id: string | null;
    locale: string;
    author_id: string | null;
    deleted: number;
    sources: string | null;
    categories: string | null;
}

type NounRowWithAuthor = NounRow & { author: User['username'] };

export const parseNounRow = (nounRow: NounRow): Omit<NounRaw, 'sourcesData'> => {
    return {
        id: nounRow.id,
        key: nounRow.key,
        words: JSON.parse(nounRow.words),
        classInstance: nounRow.classInstance ? JSON.parse(nounRow.classInstance) : null,
        categories: nounRow.categories?.split('|') ?? [],
        sources: nounRow.sources ? nounRow.sources.split(',') : [],
    };
};

export const buildNoun = (nounRaw: Omit<NounRaw, 'sourcesData'>, config: Config, nounsData: NounsData): Noun => {
    const nounRawWithLoadedWords = loadWords(nounRaw, config, { singular: {}, plural: {} });
    if (!nounRawWithLoadedWords.classInstance) {
        return new Noun(config, nounRawWithLoadedWords);
    }
    const words =
        addWordsFromClassInstance(nounRawWithLoadedWords.words, nounRawWithLoadedWords.classInstance, nounsData);
    return new Noun(config, { ...nounRaw, words });
};

const parseNounRowWithAuthor = (nounRow: NounRowWithAuthor, isGranted: IsGrantedFn): Omit<NounRaw, 'sourcesData'> => {
    const noun = parseNounRow(nounRow);
    if (isGranted(PermissionAreas.Nouns)) {
        noun.approved = !!nounRow.approved;
        noun.base = nounRow.base_id;
        noun.author = nounRow.author;
    }
    return noun;
};

export const addVersions = async (
    db: Database,
    isGranted: IsGrantedFn,
    locale: string,
    nouns: Omit<NounRaw, 'sourcesData'>[],
) => {
    const keys = new Set(nouns.flatMap((nounsRaw) => nounsRaw.sources ?? [])
        .map((sourceKey) => `'${clearKey(sourceKey.split('#')[0])}'`));

    const sources = await db.all<SourceRow & Pick<UserRow, 'username'>>(SQL`
        SELECT s.*, u.username AS submitter FROM sources s
        LEFT JOIN users u ON s.submitter_id = u.id
        WHERE s.locale == ${locale}
        AND s.deleted = 0
        AND s.approved >= ${isGranted(PermissionAreas.Sources) ? 0 : 1}
        AND s.key IN (`.append([...keys].join(',')).append(SQL`)
    `));

    const sourcesMap: Record<string, SourceRow> = {};
    sources.forEach((s) => sourcesMap[s.key!] = s);

    return nouns.map((nounRaw) => ({
        ...nounRaw,
        sourcesData: (nounRaw.sources ?? [])
            .map((sourceKey) => selectFragment(sourcesMap, sourceKey))
            .filter((source) => source !== undefined),
    }));
};

const selectFragment = (sourcesMap: Record<string, SourceRow>, keyAndFragment: string) => {
    const [key, fragment] = keyAndFragment.split('#');
    if (sourcesMap[key] === undefined) {
        return undefined;
    }
    if (fragment === undefined) {
        return sourcesMap[key];
    }

    const source = { ...sourcesMap[key] };

    const fragments = source.fragments
        ? source.fragments.replace(/\\@/g, '###').split('@')
                .map((x) => x.replace(/###/g, '@'))
        : [];

    source.fragments = fragments[parseInt(fragment) - 1];

    return source;
};

export const getNounEntries = defineCachedFunction(async (
    db: Database,
    isGranted: IsGrantedFn,
    locale: string,
): Promise<NounRaw[]> => {
    const nouns = (await db.all<NounRowWithAuthor>(SQL`
            SELECT n.*, u.username AS author FROM nouns n
            LEFT JOIN users u ON n.author_id = u.id
            WHERE n.locale = ${locale}
            AND n.deleted = 0
            AND n.approved >= ${isGranted(PermissionAreas.Nouns) ? 0 : 1}
            ORDER BY n.approved, n.key
        `)).map((nounRow) => parseNounRowWithAuthor(nounRow, isGranted));
    return await addVersions(db, isGranted, locale, nouns);
}, {
    name: 'nouns',
    getKey: (db, isGranted, locale) => locale,
    shouldBypassCache: (db, isGranted) => isGranted(PermissionAreas.Nouns),
    maxAge: 24 * 60 * 60,
});

export const approveNounEntry = async (db: Database, id: string, locale: string) => {
    const { base_id } = (await db.get<Pick<NounRow, 'base_id'>>(SQL`SELECT base_id FROM nouns WHERE id=${id}`))!;
    if (base_id) {
        await db.get(SQL`
            UPDATE nouns
            SET deleted=1
            WHERE id = ${base_id}
        `);
    }
    await db.get(SQL`
        UPDATE nouns
        SET approved = 1, base_id = NULL
        WHERE id = ${id}
    `);
    await invalidateCacheKind('nouns', locale);
};