"use client";

import { useTranslations } from "next-intl";
import type { ChromeLabels } from "./types";

/**
 * Default English chrome labels. Used as fallback when next-intl namespace
 * "chrome" doesn't resolve a key and no per-key override is passed in props.
 */
export const DEFAULT_CHROME_LABELS: ChromeLabels = {
  navigation: "Navigation",
  main: "MAIN",
  dashboard: "Dashboard",
  support: "Support",
  settings: "Settings",
  allSettings: "All Settings",
  logout: "Logout",
  myProfile: "My Profile",
  docs: "Docs",
  browseApps: "Browse apps",
  viewAll: "View all",
  activityTitle: "Activity",
  newNotifications: "New notifications",
  olderNotifications: "Older notifications",
  noOlderNotifications: "No older notifications",
  noNewNotifications: "No new notifications",
  expandSidebar: "Expand sidebar",
  collapseSidebar: "Collapse sidebar",
  closeSidebar: "Close sidebar",
};

/**
 * Resolve chrome labels with three-level precedence:
 *   1. `overrides` prop (per-key escape hatch)
 *   2. next-intl namespace "chrome" message
 *   3. hardcoded English default
 *
 * Apps add `"chrome": { ... }` to their next-intl messages to translate.
 */
export function useChromeLabels(overrides?: Partial<ChromeLabels>): ChromeLabels {
  let t: ((key: string) => string) | null = null;
  try {
    t = useTranslations("chrome");
  } catch {
    t = null;
  }

  const resolved = { ...DEFAULT_CHROME_LABELS };

  if (t) {
    for (const key of Object.keys(resolved) as (keyof ChromeLabels)[]) {
      try {
        const v = t(key);
        // next-intl returns the key path when the message is missing — treat
        // that as "no translation" so we fall back to the English default.
        if (v && v !== key && !v.startsWith("chrome.")) {
          resolved[key] = v;
        }
      } catch {
        // Missing key — keep the default.
      }
    }
  }

  if (overrides) {
    for (const k of Object.keys(overrides) as (keyof ChromeLabels)[]) {
      const v = overrides[k];
      if (v != null) resolved[k] = v;
    }
  }

  return resolved;
}