const I18nPreferencesRepository = require('../../repositories/settings/I18nPreferencesRepository');
const { logger } = require('../../middleware/logger');

const repo = new I18nPreferencesRepository();

class I18nPreferencesController {
  static _normalizeStringArray(values) {
    if (!Array.isArray(values)) return [];
    const normalized = values
      .map((v) => (v == null ? '' : String(v).trim()))
      .filter(Boolean);
    return [...new Set(normalized)];
  }

  static _normalizeCategories(categories) {
    if (!Array.isArray(categories)) return [];

    return categories
      .map((item, idx) => {
        const id = String(item?.id ?? '').trim() || `category_${idx + 1}`;
        const label = String(item?.label ?? id).trim() || id;
        const namespaces = I18nPreferencesController._normalizeStringArray(item?.namespaces);
        const isCustom = Boolean(item?.isCustom);
        return { id, label, namespaces, isCustom };
      });
  }

  static _buildResponse(preferences) {
    return {
      ok: true,
      preferences,
      categories: preferences.categories,
      globalKeys: preferences.globalKeys,
    };
  }

  static async get(req, res) {
    try {
      const preferences = await repo.get();
      return res.status(200).json(I18nPreferencesController._buildResponse(preferences));
    } catch (error) {
      logger.error('i18nPreferences:get:failed', { error: error?.message });
      return res.status(500).json({ ok: false, message: 'Failed to load i18n preferences' });
    }
  }

  static async post(req, res) {
    try {
      const categories = I18nPreferencesController._normalizeCategories(req.body?.categories);
      const globalKeys = I18nPreferencesController._normalizeStringArray(req.body?.globalKeys);

      const preferences = await repo.upsert({
        categories,
        globalKeys,
        updatedByUserId: req.user?.userId ?? req.user?.id ?? null,
      });

      return res.status(200).json(I18nPreferencesController._buildResponse(preferences));
    } catch (error) {
      logger.error('i18nPreferences:post:failed', { error: error?.message });
      return res.status(500).json({ ok: false, message: 'Failed to save i18n preferences' });
    }
  }

  static async put(req, res) {
    try {
      const categories = I18nPreferencesController._normalizeCategories(req.body?.categories);
      const globalKeys = I18nPreferencesController._normalizeStringArray(req.body?.globalKeys);

      const preferences = await repo.upsert({
        categories,
        globalKeys,
        updatedByUserId: req.user?.userId ?? req.user?.id ?? null,
      });

      return res.status(200).json(I18nPreferencesController._buildResponse(preferences));
    } catch (error) {
      logger.error('i18nPreferences:put:failed', { error: error?.message });
      return res.status(500).json({ ok: false, message: 'Failed to update i18n preferences' });
    }
  }

  static async delete(req, res) {
    try {
      const hasBodyReplacement = req.body && (
        Object.prototype.hasOwnProperty.call(req.body, 'categories') ||
        Object.prototype.hasOwnProperty.call(req.body, 'globalKeys')
      );

      const preferences = hasBodyReplacement
        ? await repo.upsert({
            categories: I18nPreferencesController._normalizeCategories(req.body?.categories),
            globalKeys: I18nPreferencesController._normalizeStringArray(req.body?.globalKeys),
            updatedByUserId: req.user?.userId ?? req.user?.id ?? null,
          })
        : await repo.clear(req.user?.userId ?? req.user?.id ?? null);

      return res.status(200).json(I18nPreferencesController._buildResponse(preferences));
    } catch (error) {
      logger.error('i18nPreferences:delete:failed', { error: error?.message });
      return res.status(500).json({ ok: false, message: 'Failed to delete i18n preferences' });
    }
  }
}

module.exports = I18nPreferencesController;