import { Platform } from "react-native";

// Token persistence: localStorage on web, SecureStore on native.
const KEY = "campscan.token";
const OPERATOR_KEY = "campscan.operator";

export async function saveToken(token: string): Promise<void> {
  if (Platform.OS === "web") {
    try {
      window.localStorage.setItem(KEY, token);
    } catch {
      /* ignore */
    }
    return;
  }
  const SecureStore = await import("expo-secure-store");
  await SecureStore.setItemAsync(KEY, token);
}

export async function loadToken(): Promise<string | null> {
  if (Platform.OS === "web") {
    try {
      return window.localStorage.getItem(KEY);
    } catch {
      return null;
    }
  }
  const SecureStore = await import("expo-secure-store");
  return SecureStore.getItemAsync(KEY);
}

export async function clearToken(): Promise<void> {
  if (Platform.OS === "web") {
    try {
      window.localStorage.removeItem(KEY);
    } catch {
      /* ignore */
    }
    return;
  }
  const SecureStore = await import("expo-secure-store");
  await SecureStore.deleteItemAsync(KEY);
}

// Operator (gate staff) name — plain persistence, not sensitive. Kept in
// localStorage on both platforms for simplicity (SecureStore is overkill here;
// on native we still use localStorage-less AsyncStorage-free approach below).
export async function saveOperator(name: string): Promise<void> {
  if (Platform.OS === "web") {
    try {
      window.localStorage.setItem(OPERATOR_KEY, name);
    } catch {
      /* ignore */
    }
    return;
  }
  const SecureStore = await import("expo-secure-store");
  await SecureStore.setItemAsync(OPERATOR_KEY, name);
}

export async function loadOperator(): Promise<string | null> {
  if (Platform.OS === "web") {
    try {
      return window.localStorage.getItem(OPERATOR_KEY);
    } catch {
      return null;
    }
  }
  const SecureStore = await import("expo-secure-store");
  return SecureStore.getItemAsync(OPERATOR_KEY);
}

export async function clearOperator(): Promise<void> {
  if (Platform.OS === "web") {
    try {
      window.localStorage.removeItem(OPERATOR_KEY);
    } catch {
      /* ignore */
    }
    return;
  }
  const SecureStore = await import("expo-secure-store");
  await SecureStore.deleteItemAsync(OPERATOR_KEY);
}