export const WECHAT_MINI_PROGRAM_PAYMENT_CHANNEL = 'wechat_mp';
export const WECHAT_H5_PAYMENT_CHANNEL = 'wechat_h5';
export const WECHAT_NATIVE_PAYMENT_CHANNEL = 'wechat_native';
export const MOCK_PAYMENT_CHANNEL = 'mock';

export type ProfileRechargeWechatPaymentChannel =
  | typeof WECHAT_MINI_PROGRAM_PAYMENT_CHANNEL
  | typeof WECHAT_H5_PAYMENT_CHANNEL
  | typeof WECHAT_NATIVE_PAYMENT_CHANNEL;

type PaymentPlatformNavigator = Pick<Navigator, 'userAgent' | 'maxTouchPoints'>;

export type PaymentPlatformContext = {
  location?: Pick<Location, 'search'> | null;
  navigator?: Partial<PaymentPlatformNavigator> | null;
  matchMedia?: Window['matchMedia'] | null;
};

export function shouldShowRechargeEntry(
  context: PaymentPlatformContext = {},
) {
  const location =
    context.location ?? (typeof window !== 'undefined' ? window.location : null);
  const navigatorLike =
    context.navigator ?? (typeof navigator !== 'undefined' ? navigator : null);

  return (
    isWechatMiniProgramRuntime(location) ||
    isWechatBrowserRuntime(navigatorLike)
  );
}

export function resolveProfileRechargePaymentChannel(
  context: PaymentPlatformContext = {},
): ProfileRechargeWechatPaymentChannel {
  const location =
    context.location ??
    (typeof window !== 'undefined' ? window.location : null);
  const navigatorLike =
    context.navigator ?? (typeof navigator !== 'undefined' ? navigator : null);
  const matchMedia =
    context.matchMedia ??
    (typeof window !== 'undefined' && typeof window.matchMedia === 'function'
      ? window.matchMedia.bind(window)
      : null);

  if (isWechatMiniProgramRuntime(location)) {
    return WECHAT_MINI_PROGRAM_PAYMENT_CHANNEL;
  }

  if (isMobileWebRuntime(navigatorLike, matchMedia)) {
    return WECHAT_H5_PAYMENT_CHANNEL;
  }

  return WECHAT_NATIVE_PAYMENT_CHANNEL;
}

export function isManualMockPaymentChannel(paymentChannel: string) {
  return paymentChannel.trim() === MOCK_PAYMENT_CHANNEL;
}

function isWechatMiniProgramRuntime(
  location: Pick<Location, 'search'> | null | undefined,
) {
  const params = new URLSearchParams(location?.search ?? '');
  return (
    params.get('clientRuntime') === 'wechat_mini_program' ||
    params.get('clientType') === 'mini_program'
  );
}

function isWechatBrowserRuntime(
  navigatorLike: Partial<PaymentPlatformNavigator> | null | undefined,
) {
  return (
    navigatorLike?.userAgent?.toLowerCase().includes('micromessenger') ??
    false
  );
}

function isMobileWebRuntime(
  navigatorLike: Partial<PaymentPlatformNavigator> | null | undefined,
  matchMedia: Window['matchMedia'] | null | undefined,
) {
  const userAgent = navigatorLike?.userAgent?.toLowerCase() ?? '';
  if (/android|iphone|ipad|ipod|mobile|windows phone/u.test(userAgent)) {
    return true;
  }

  if ((navigatorLike?.maxTouchPoints ?? 0) > 1) {
    return true;
  }

  return Boolean(matchMedia?.('(max-width: 767px)').matches);
}