import { Platform } from 'react-native';
import { requireOptionalNativeModule } from 'expo-modules-core';

interface BbpNotifyNative {
  /**
   * Post/replace an ongoing notification with a native chronometer counting down
   * to endTimeMillis. Returns a short diagnostic string (e.g. "posted enabled=true").
   */
  showCountdown(title: string, body: string, endTimeMillis: number): Promise<string>;
  /** Remove the countdown notification. */
  clear(): Promise<void>;
}

// Android-only, and only present in a build that includes the native module
// (returns null in Expo Go / other platforms — callers degrade gracefully).
const native =
  Platform.OS === 'android'
    ? (requireOptionalNativeModule('BbpNotify') as BbpNotifyNative | null)
    : null;

/** True when the native ticking-countdown module is available. */
export const hasNativeCountdown = native != null;

export async function showCountdown(
  title: string,
  body: string,
  endTimeMillis: number,
): Promise<string> {
  if (!native) return 'no-native-module';
  return native.showCountdown(title, body, endTimeMillis);
}

export async function clearCountdown(): Promise<void> {
  await native?.clear();
}