/**
 * Suppliers resource – Real HTTP implementation.
 * Endpoints: GET/POST /api/suppliers, GET/PUT /api/suppliers/{id},
 *   POST /api/suppliers/{id}/activate|deactivate,
 *   POST /api/suppliers/{id}/rating,
 *   POST /api/suppliers/{id}/certificates,
 *   DELETE /api/suppliers/{id}/certificates (with body)
 *
 * NOTE: Backend returns domain objects with nested VOs:
 *   { "id": {"value":"uuid"}, "name": {"value":"string"},
 *     "address": {"street":"...","houseNumber":"...","postalCode":"...","city":"...","country":"DE"},
 *     "contactInfo": {"phone":"...","email":"...","contactPerson":"..."},
 *     "paymentTerms": {"paymentDueDays":30,"description":"..."},
 *     "certificates": [{"certificateType":"...","issuer":"...","validFrom":"2024-01-01","validUntil":"2026-12-31"}],
 *     "rating": {"qualityScore":4,"deliveryScore":4,"priceScore":5},
 *     "status": "ACTIVE", "createdAt":"...", "updatedAt":"..." }
 * DELETE /api/suppliers/{id}/certificates returns 204 No Content → re-fetch.
 */

import type { AxiosInstance } from 'axios';

export interface AddressDTO {
  street: string;
  houseNumber: string | null;
  postalCode: string;
  city: string;
  country: string;
}

export interface ContactInfoDTO {
  phone: string;
  email: string | null;
  contactPerson: string | null;
}

export interface PaymentTermsDTO {
  paymentDueDays: number;
  paymentDescription: string | null;
}

export interface QualityCertificateDTO {
  certificateType: string;
  issuer: string;
  validFrom: string;
  validUntil: string;
}

export interface SupplierRatingDTO {
  qualityScore: number;
  deliveryScore: number;
  priceScore: number;
}

export type SupplierStatus = 'ACTIVE' | 'INACTIVE';

export interface SupplierDTO {
  id: string;
  name: string;
  status: SupplierStatus;
  address: AddressDTO | null;
  contactInfo: ContactInfoDTO;
  paymentTerms: PaymentTermsDTO | null;
  certificates: QualityCertificateDTO[];
  rating: SupplierRatingDTO | null;
  createdAt: string;
  updatedAt: string;
}

export interface CreateSupplierRequest {
  name: string;
  phone: string;
  email?: string;
  contactPerson?: string;
  street?: string;
  houseNumber?: string;
  postalCode?: string;
  city?: string;
  country?: string;
  paymentDueDays?: number;
  paymentDescription?: string;
}

export interface UpdateSupplierRequest {
  name?: string;
  phone?: string;
  email?: string | null;
  contactPerson?: string | null;
  street?: string | null;
  houseNumber?: string | null;
  postalCode?: string | null;
  city?: string | null;
  country?: string | null;
  paymentDueDays?: number | null;
  paymentDescription?: string | null;
}

export interface RateSupplierRequest {
  qualityScore: number;
  deliveryScore: number;
  priceScore: number;
}

export interface AddCertificateRequest {
  certificateType: string;
  issuer: string;
  validFrom: string;
  validUntil: string;
}

export interface RemoveCertificateRequest {
  certificateType: string;
  issuer: string;
  validFrom: string;
}

// ── Backend response shapes (domain objects with nested VOs) ─────────────────

interface BackendAddress {
  street: string;
  houseNumber: string | null;
  postalCode: string;
  city: string;
  country: string;
}

interface BackendContactInfo {
  phone: string;
  email: string | null;
  contactPerson: string | null;
}

interface BackendPaymentTerms {
  paymentDueDays: number;
  description: string | null; // Note: backend field is "description", not "paymentDescription"
}

interface BackendQualityCertificate {
  certificateType: string;
  issuer: string;
  validFrom: string; // LocalDate → "2024-01-01"
  validUntil: string;
}

interface BackendSupplierRating {
  qualityScore: number;
  deliveryScore: number;
  priceScore: number;
}

interface BackendSupplier {
  id: { value: string };
  name: { value: string };
  address: BackendAddress | null;
  contactInfo: BackendContactInfo;
  paymentTerms: BackendPaymentTerms | null;
  certificates: BackendQualityCertificate[];
  rating: BackendSupplierRating | null;
  status: SupplierStatus;
  createdAt: string;
  updatedAt: string;
}

function mapSupplier(bs: BackendSupplier): SupplierDTO {
  return {
    id: bs.id.value,
    name: bs.name.value,
    status: bs.status,
    address: bs.address,
    contactInfo: bs.contactInfo,
    paymentTerms: bs.paymentTerms
      ? {
          paymentDueDays: bs.paymentTerms.paymentDueDays,
          paymentDescription: bs.paymentTerms.description,
        }
      : null,
    certificates: bs.certificates,
    rating: bs.rating,
    createdAt: bs.createdAt,
    updatedAt: bs.updatedAt,
  };
}

// ── Resource factory ─────────────────────────────────────────────────────────

export function createSuppliersResource(client: AxiosInstance) {
  return {
    async list(): Promise<SupplierDTO[]> {
      const res = await client.get<BackendSupplier[]>('/api/suppliers');
      return res.data.map(mapSupplier);
    },

    async getById(id: string): Promise<SupplierDTO> {
      const res = await client.get<BackendSupplier>(`/api/suppliers/${id}`);
      return mapSupplier(res.data);
    },

    async create(request: CreateSupplierRequest): Promise<SupplierDTO> {
      const res = await client.post<BackendSupplier>('/api/suppliers', request);
      return mapSupplier(res.data);
    },

    async update(id: string, request: UpdateSupplierRequest): Promise<SupplierDTO> {
      const res = await client.put<BackendSupplier>(`/api/suppliers/${id}`, request);
      return mapSupplier(res.data);
    },

    async activate(id: string): Promise<SupplierDTO> {
      const res = await client.post<BackendSupplier>(`/api/suppliers/${id}/activate`);
      return mapSupplier(res.data);
    },

    async deactivate(id: string): Promise<SupplierDTO> {
      const res = await client.post<BackendSupplier>(`/api/suppliers/${id}/deactivate`);
      return mapSupplier(res.data);
    },

    async rate(id: string, request: RateSupplierRequest): Promise<SupplierDTO> {
      const res = await client.post<BackendSupplier>(`/api/suppliers/${id}/rating`, request);
      return mapSupplier(res.data);
    },

    async addCertificate(id: string, request: AddCertificateRequest): Promise<SupplierDTO> {
      const res = await client.post<BackendSupplier>(`/api/suppliers/${id}/certificates`, request);
      return mapSupplier(res.data);
    },

    // Returns 204 No Content → re-fetch supplier
    async removeCertificate(id: string, request: RemoveCertificateRequest): Promise<SupplierDTO> {
      await client.delete(`/api/suppliers/${id}/certificates`, { data: request });
      const res = await client.get<BackendSupplier>(`/api/suppliers/${id}`);
      return mapSupplier(res.data);
    },
  };
}

export type SuppliersResource = ReturnType<typeof createSuppliersResource>;