import fs from "fs";
import path from "path";
import yaml from "js-yaml";
import { Request, Response } from "express";
import { themes } from "../data/themes.js";

interface Translations {
    curricula_page: {
        [key: string]: { title: string; description?: string }; // Optioneel veld description
    };
}

/**
 * Laadt de vertalingen uit een YAML-bestand
 */
function loadTranslations(language: string): Translations {
    try {
        const filePath = path.join(process.cwd(), "_i18n", `${language}.yml`);
        const yamlFile = fs.readFileSync(filePath, "utf8");
        return yaml.load(yamlFile) as Translations;
    } catch (error) {
        console.error(`Kan vertaling niet laden voor ${language}, fallback naar Nederlands`);
        console.error(error);
        const fallbackPath = path.join(process.cwd(), "_i18n", "nl.yml");
        return yaml.load(fs.readFileSync(fallbackPath, "utf8")) as Translations;
    }
}

/**
 * GET /themes → Haalt de lijst met thema's op inclusief vertalingen
 */
export function getThemes(req: Request, res: Response){
    const language = (req.query.language as string)?.toLowerCase() || "nl";
    const translations = loadTranslations(language);

    const themeList = themes.map((theme) => {return {
        key: theme.title,
        title: translations.curricula_page[theme.title]?.title || theme.title,
        description: translations.curricula_page[theme.title]?.description,
        image: `https://dwengo.org/images/curricula/logo_${theme.title}.png`
    }});

    res.json(themeList);
};

/**
 * GET /themes/:theme → Geeft de HRUIDs terug voor een specifiek thema
 */
export function getThemeByTitle(req: Request, res: Response) {
    const themeKey = req.params.theme;
    const theme = themes.find((t) => {return t.title === themeKey});

    if (theme) {
        res.json(theme.hruids);
    } else {
        res.status(404).json({ error: "Thema niet gevonden" });
    }
};