import { clientFetch } from '@/lib/api/client';
import { unwrap, type ApiEnvelope, type Paginated } from '@/lib/api/types';
import { ADDRESSES_PAGE_SIZE } from '../constants';
import type { CreateAddressInput, CustomerAddress, CustomerAddressDto, AddressesApi } from '../types';

const BASE = '/api/v1/customer_addresses';

// REQ-009 (delivered): the wire `CustomerAddressDto` now carries `provinceId` (joined from
// `cities.province_id`), so a freshly-fetched address prefills the cascade. The caller's chosen
// province is kept as a fallback for the optimistic just-saved echo.
interface AddressWire extends CustomerAddressDto {
  provinceId: number;
}
function toAddress(dto: AddressWire, provinceId?: number | null): CustomerAddress {
  return { ...dto, provinceId: dto.provinceId ?? provinceId ?? null };
}

// Only the contract fields cross the wire. `latitude`/`longitude` are the picked pin (REQ-008 —
// the server geocodes today; sending the pin makes the coordinate the user's once accepted);
// `provinceId` stays client-side (city implies province server-side).
function toBody(input: CreateAddressInput) {
  return {
    title: input.title,
    cityId: input.cityId,
    districtId: input.districtId ?? null,
    addressLine: input.addressLine,
    postalCode: input.postalCode ?? null,
    recipientName: input.recipientName ?? null,
    recipientPhone: input.recipientPhone ?? null,
    latitude: input.latitude ?? null,
    longitude: input.longitude ?? null,
    isPrimary: input.isPrimary ?? false,
  };
}

/**
 * Real HTTP implementation of the AddressesApi seam (b4 action-style routes). `clientFetch`
 * returns the raw envelope, so each call reads its payload via `unwrap`. Selected once
 * USE_ADDRESSES_MOCK is false and REQ-008/REQ-009 land.
 */
export const addressesClientApi: AddressesApi = {
  list: async (params) => {
    const query = new URLSearchParams();
    query.set('page', String(params?.page ?? 1));
    // Pagination params bind case-insensitively to the server's `PageSize` (not snake_cased, unlike the
    // geo lookups' explicit `province_id`/`city_id`); match the patients template's `pageSize`.
    query.set('pageSize', String(params?.pageSize ?? ADDRESSES_PAGE_SIZE));
    const page = unwrap(
      await clientFetch<ApiEnvelope<Paginated<AddressWire>>>(`${BASE}/list?${query.toString()}`),
    );
    return { ...page, items: page.items.map((dto) => toAddress(dto)) };
  },

  create: async (input) =>
    toAddress(
      unwrap(
        await clientFetch<ApiEnvelope<AddressWire>>(`${BASE}/create`, {
          method: 'POST',
          body: JSON.stringify(toBody(input)),
        }),
      ),
      input.provinceId,
    ),

  update: async (id, input) =>
    toAddress(
      unwrap(
        await clientFetch<ApiEnvelope<AddressWire>>(`${BASE}/update/${id}`, {
          method: 'POST',
          body: JSON.stringify(toBody(input)),
        }),
      ),
      input.provinceId,
    ),

  setPrimary: async (id) => {
    await clientFetch<ApiEnvelope<boolean>>(`${BASE}/set_primary/${id}`, { method: 'POST' });
  },

  remove: async (id) => {
    await clientFetch<ApiEnvelope<boolean>>(`${BASE}/delete/${id}`, { method: 'DELETE' });
  },
};