/**
 * Alert i18n Translation Utility
 *
 * Handles translation of alert titles and messages using i18n keys from backend enrichment.
 * Falls back to raw title/message if i18n data is not available.
 */

import { TFunction } from 'i18next';

export interface AlertI18nData {
  title_key?: string;
  title_params?: Record<string, any>;
  message_key?: string;
  message_params?: Record<string, any>;
}

export interface AlertTranslationResult {
  title: string;
  message: string;
  isTranslated: boolean;
}

/**
 * Translates alert title and message using i18n data from metadata
 *
 * @param alert - Alert object with title, message, and metadata
 * @param t - i18next translation function
 * @returns Translated or fallback title and message
 */
export function translateAlert(
  alert: {
    title: string;
    message: string;
    metadata?: Record<string, any>;
  },
  t: TFunction
): AlertTranslationResult {
  // Extract i18n data from metadata
  const i18nData = alert.metadata?.i18n as AlertI18nData | undefined;

  // If no i18n data, return original title and message
  if (!i18nData || (!i18nData.title_key && !i18nData.message_key)) {
    return {
      title: alert.title,
      message: alert.message,
      isTranslated: false,
    };
  }

  // Translate title
  let translatedTitle = alert.title;
  if (i18nData.title_key) {
    try {
      const translated = t(i18nData.title_key, i18nData.title_params || {});
      // Only use translation if it's not the key itself (i18next returns key if translation missing)
      if (translated !== i18nData.title_key) {
        translatedTitle = translated;
      }
    } catch (error) {
      console.warn(`Failed to translate alert title with key: ${i18nData.title_key}`, error);
    }
  }

  // Translate message
  let translatedMessage = alert.message;
  if (i18nData.message_key) {
    try {
      const translated = t(i18nData.message_key, i18nData.message_params || {});
      // Only use translation if it's not the key itself
      if (translated !== i18nData.message_key) {
        translatedMessage = translated;
      }
    } catch (error) {
      console.warn(`Failed to translate alert message with key: ${i18nData.message_key}`, error);
    }
  }

  return {
    title: translatedTitle,
    message: translatedMessage,
    isTranslated: true,
  };
}

/**
 * Translates alert title only
 *
 * @param alert - Alert object
 * @param t - i18next translation function
 * @returns Translated or fallback title
 */
export function translateAlertTitle(
  alert: {
    title: string;
    metadata?: Record<string, any>;
  },
  t: TFunction
): string {
  const i18nData = alert.metadata?.i18n as AlertI18nData | undefined;

  if (!i18nData?.title_key) {
    return alert.title;
  }

  try {
    const translated = t(i18nData.title_key, i18nData.title_params || {});
    return translated !== i18nData.title_key ? translated : alert.title;
  } catch (error) {
    console.warn(`Failed to translate alert title with key: ${i18nData.title_key}`, error);
    return alert.title;
  }
}

/**
 * Translates alert message only
 *
 * @param alert - Alert object
 * @param t - i18next translation function
 * @returns Translated or fallback message
 */
export function translateAlertMessage(
  alert: {
    message: string;
    metadata?: Record<string, any>;
  },
  t: TFunction
): string {
  const i18nData = alert.metadata?.i18n as AlertI18nData | undefined;

  if (!i18nData?.message_key) {
    return alert.message;
  }

  try {
    const translated = t(i18nData.message_key, i18nData.message_params || {});
    return translated !== i18nData.message_key ? translated : alert.message;
  } catch (error) {
    console.warn(`Failed to translate alert message with key: ${i18nData.message_key}`, error);
    return alert.message;
  }
}

/**
 * Checks if alert has i18n data available
 *
 * @param alert - Alert object
 * @returns True if i18n data is present
 */
export function hasI18nData(alert: { metadata?: Record<string, any> }): boolean {
  const i18nData = alert.metadata?.i18n as AlertI18nData | undefined;
  return !!(i18nData && (i18nData.title_key || i18nData.message_key));
}