export type GiftVoucherTier = {
  key: string;
  label: string;
  amount: number;
  currency: string;
  paddle_price_id?: string | null;
  can_checkout: boolean;
};

export type GiftVoucherCheckoutRequest = {
  tier_key: string;
  purchaser_email: string;
  recipient_email?: string;
  recipient_name?: string;
  message?: string;
  success_url?: string;
  return_url?: string;
};

export type GiftVoucherCheckoutResponse = {
  checkout_url: string | null;
  expires_at: string | null;
  id: string | null;
};

export async function fetchGiftVoucherTiers(): Promise<GiftVoucherTier[]> {
  const response = await fetch('/api/v1/marketing/gift-vouchers/tiers', {
    headers: {
      Accept: 'application/json',
    },
  });

  if (!response.ok) {
    throw new Error('Failed to load gift voucher tiers');
  }

  const payload = await response.json();

  return (payload?.data ?? []) as GiftVoucherTier[];
}

export async function createGiftVoucherCheckout(data: GiftVoucherCheckoutRequest): Promise<GiftVoucherCheckoutResponse> {
  const response = await fetch('/api/v1/marketing/gift-vouchers/checkout', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      Accept: 'application/json',
    },
    body: JSON.stringify(data),
  });

  const payload = await response.json().catch(() => ({}));

  if (!response.ok) {
    const message =
      (payload?.errors && typeof payload.errors === 'object' && Object.values(payload.errors)[0]?.[0]) ||
      payload?.message ||
      'Unable to start checkout';
    throw new Error(message);
  }

  return payload as GiftVoucherCheckoutResponse;
}