// Reported here rather than at the UI call sites so that no caller can add an
// item or complete a checkout without it being counted (#56). Every one of
// these calls is a no-op unless a consenting customer is signed in and the
// environment has a key, so importing this into the API layer does not make the
// cart depend on analytics being configured.
import { brevoTrack } from '../brevo';

export interface CartItem {
  item_id: number;
  name: string;
  price_cents: number;
  status: string;
  added_at: string;
  expires_at: string;
  images: { id: number; image_path: string }[];
}

export interface ShippingAddress {
  id: number;
  full_name: string;
  address_line1: string;
  address_line2: string | null;
  city: string;
  state: string;
  postal_code: string;
  country: string;
  is_default: boolean;
  usps_validated: boolean;
}

async function handle<T>(res: Response): Promise<T> {
  if (!res.ok) {
    const data = await res.json().catch(() => ({}));
    throw new Error(data.error || 'Request failed');
  }
  return res.json();
}

export function fetchCart(): Promise<{ items: CartItem[] }> {
  return fetch('/api/cart').then(res => handle(res));
}

export function addToCart(itemId: number): Promise<{ itemId: number; expiresAt: string }> {
  // After handle(), which throws on a non-OK response — so a refused add (the
  // item was already reserved by someone else) is not reported as one.
  return fetch(`/api/cart/items/${itemId}`, { method: 'POST' })
    .then(res => handle<{ itemId: number; expiresAt: string }>(res))
    .then(result => {
      brevoTrack('added_to_cart', { itemId });
      return result;
    });
}

export function removeFromCart(itemId: number): Promise<void> {
  return fetch(`/api/cart/items/${itemId}`, { method: 'DELETE' }).then(() => undefined);
}

export function fetchAddresses(): Promise<ShippingAddress[]> {
  return fetch('/api/customers/me/addresses').then(res => handle(res));
}

export interface AddressInput {
  fullName: string;
  addressLine1: string;
  addressLine2?: string;
  city: string;
  state: string;
  postalCode: string;
  country?: string;
  isDefault?: boolean;
}

export function createAddress(input: AddressInput): Promise<{ address: ShippingAddress; uspsCheck: { validated: boolean; deliverable: boolean | null; reason?: string }; uspsConfigured: boolean }> {
  return fetch('/api/customers/me/addresses', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(input)
  }).then(res => handle(res));
}

export function deleteAddress(id: number): Promise<void> {
  return fetch(`/api/customers/me/addresses/${id}`, { method: 'DELETE' }).then(() => undefined);
}

export function setDefaultAddress(id: number): Promise<ShippingAddress> {
  return fetch(`/api/customers/me/addresses/${id}/set-default`, { method: 'POST' }).then(res => handle(res));
}

export function createCartPaypalOrder(shippingAddressId: number): Promise<{ orderID: string }> {
  return fetch('/api/checkout/cart/paypal/create', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ shippingAddressId })
  }).then(res => handle(res));
}

// The two checkout completions are separate functions rather than one, so both
// report the event and both say which they were. Without the processor these
// would be indistinguishable in Brevo, and a demo purchase charges nothing —
// counting it as a sale would overstate revenue. QA cannot reach here anyway
// (no key), but DEMO_MODE is not exclusive to QA, so the distinction is real.
export function captureCartPaypalOrder(orderID: string): Promise<void> {
  return fetch('/api/checkout/cart/paypal/capture', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ orderID })
  })
    .then(res => handle<void>(res))
    .then(() => { brevoTrack('checkout_completed', { processor: 'paypal' }); });
}

export function demoCartPurchase(shippingAddressId: number): Promise<void> {
  return fetch('/api/checkout/cart/demo/purchase', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ shippingAddressId })
  })
    .then(res => handle<void>(res))
    .then(() => { brevoTrack('checkout_completed', { processor: 'demo' }); });
}