import { api, PaginatedResult } from "@/lib/api";
import type { Product } from "@/data/products";

// Backend shape (snake_case)
interface ApiProduct {
  id: string;
  name: string;
  category: "clip-in" | "tape-in" | "ponytail" | "keratin";
  price: number;
  original_price?: number;
  image: string;
  images: string[];
  colors: string[];
  lengths: string[];
  description: string;
  features: string[];
  is_new?: boolean;
  is_bestseller?: boolean;
  rating: number;
  review_count: number;
  stock_quantity: number;
  is_featured: boolean;
  is_hidden: boolean;
}

function toProduct(p: ApiProduct): Product {
  return {
    id: p.id,
    name: p.name,
    category: p.category,
    price: p.price,
    originalPrice: p.original_price,
    image: p.image,
    images: p.images,
    colors: p.colors,
    lengths: p.lengths,
    description: p.description,
    features: p.features,
    isNew: p.is_new,
    isBestseller: p.is_bestseller,
    rating: p.rating,
    reviewCount: p.review_count,
  };
}

export interface ProductFilters {
  page?: number;
  per_page?: number;
  search?: string;
  category?: string;
  bestseller?: boolean;
  is_new?: boolean;
  exclude?: string;
}

export async function listProducts(
  filters: ProductFilters = {}
): Promise<PaginatedResult<Product>> {
  const params = new URLSearchParams();
  if (filters.page) params.set("page", String(filters.page));
  if (filters.per_page) params.set("per_page", String(filters.per_page));
  if (filters.search) params.set("search", filters.search);
  if (filters.category) params.set("category", filters.category);
  if (filters.bestseller) params.set("bestseller", "true");
  if (filters.is_new) params.set("is_new", "true");
  if (filters.exclude) params.set("exclude", filters.exclude);

  const qs = params.toString();
  const res = await api.get<PaginatedResult<ApiProduct>>(`/products${qs ? `?${qs}` : ""}`);
  return { data: res.data.map(toProduct), meta: res.meta };
}

export async function getProduct(id: string): Promise<Product> {
  const p = await api.get<ApiProduct>(`/products/${id}`);
  return toProduct(p);
}

// ── Admin ─────────────────────────────────────────────────────────────────────

export interface ProductPayload {
  name: string;
  category: string;
  price: number;
  original_price?: number;
  description?: string;
  images?: string[];
  colors?: string[];
  lengths?: string[];
  features?: string[];
  is_new?: boolean;
  is_bestseller?: boolean;
  stock_quantity?: number;
}

export async function adminListProducts(): Promise<PaginatedResult<Product>> {
  const res = await api.get<PaginatedResult<ApiProduct>>("/admin/products?per_page=100&include_hidden=true");
  return { data: res.data.map(toProduct), meta: res.meta };
}

export async function adminCreateProduct(payload: ProductPayload): Promise<Product> {
  const p = await api.post<ApiProduct>("/admin/products", payload);
  return toProduct(p);
}

export async function adminUpdateProduct(id: string, payload: Partial<ProductPayload>): Promise<Product> {
  const p = await api.put<ApiProduct>(`/admin/products/${id}`, payload);
  return toProduct(p);
}

export async function adminDeleteProduct(id: string): Promise<void> {
  await api.del(`/admin/products/${id}`);
}

export async function adminUploadProductImage(productId: string, file: File): Promise<Product> {
  const form = new FormData();
  form.append("file", file);
  const p = await api.upload<ApiProduct>(`/admin/products/${productId}/images`, form);
  return toProduct(p);
}