import type { AuthenticatedMedusaRequest, MedusaRequest, MedusaResponse } from "@medusajs/framework";
import { ContainerRegistrationKeys, MedusaError } from "@medusajs/framework/utils";
import { PRODUCT_REVIEW_MODULE } from "../../../modules/product-review";
import type ProductReviewModuleService from "../../../modules/product-review/service";

// GET /store/reviews?product_id=... -- reseñas APROBADAS de un producto,
// mas promedio y cantidad. Publica (solo publishable key).
export async function GET(req: MedusaRequest, res: MedusaResponse) {
  const productId = typeof req.query.product_id === "string" ? req.query.product_id : "";
  if (!productId) {
    throw new MedusaError(MedusaError.Types.INVALID_DATA, "product_id es obligatorio");
  }
  const reviews = req.scope.resolve<ProductReviewModuleService>(PRODUCT_REVIEW_MODULE);
  const list = await reviews.listProductReviews(
    { product_id: productId, status: "approved" },
    { order: { created_at: "DESC" }, take: 50 },
  );
  const count = list.length;
  const average = count ? list.reduce((sum, review) => sum + review.rating, 0) / count : 0;
  res.json({
    reviews: list.map((review) => ({
      id: review.id,
      author_name: review.author_name,
      rating: review.rating,
      title: review.title,
      content: review.content,
      created_at: review.created_at,
      verified_purchase: true,
    })),
    average: Math.round(average * 10) / 10,
    count,
  });
}

type CreateReviewBody = {
  product_id?: string;
  order_id?: string;
  rating?: number;
  title?: string;
  content?: string;
};

// POST /store/reviews -- solo clientes autenticados (middleware) y solo
// si el pedido indicado es SUYO, no esta cancelado y contiene el
// producto: eso es lo que respalda el sello "Compra verificada". Nace
// "pending" hasta que el dueño la apruebe en el admin.
export async function POST(req: AuthenticatedMedusaRequest<CreateReviewBody>, res: MedusaResponse) {
  const customerId = req.auth_context.actor_id;
  const { product_id, order_id, title } = req.body ?? {};
  const rating = Number(req.body?.rating);
  const content = (req.body?.content ?? "").trim();

  if (!product_id || !order_id) {
    throw new MedusaError(MedusaError.Types.INVALID_DATA, "product_id y order_id son obligatorios");
  }
  if (!Number.isInteger(rating) || rating < 1 || rating > 5) {
    throw new MedusaError(MedusaError.Types.INVALID_DATA, "La calificación debe ser un número entero de 1 a 5");
  }
  if (content.length < 10 || content.length > 2000) {
    throw new MedusaError(MedusaError.Types.INVALID_DATA, "El comentario debe tener entre 10 y 2000 caracteres");
  }

  const query = req.scope.resolve(ContainerRegistrationKeys.QUERY);
  const { data: orders } = await query.graph({
    entity: "order",
    fields: ["id", "customer_id", "status", "items.product_id"],
    filters: { id: order_id },
  });
  const order = orders[0];
  const purchased =
    order &&
    order.customer_id === customerId &&
    order.status !== "canceled" &&
    (order.items ?? []).some((item) => item?.product_id === product_id);
  if (!purchased) {
    throw new MedusaError(MedusaError.Types.NOT_ALLOWED, "Solo puedes reseñar productos que compraste");
  }

  const reviews = req.scope.resolve<ProductReviewModuleService>(PRODUCT_REVIEW_MODULE);
  const existing = await reviews.listProductReviews({ product_id, customer_id: customerId });
  if (existing.length > 0) {
    throw new MedusaError(MedusaError.Types.DUPLICATE_ERROR, "Ya dejaste una reseña para este producto");
  }

  const { data: customers } = await query.graph({
    entity: "customer",
    fields: ["first_name", "last_name"],
    filters: { id: customerId },
  });
  const customer = customers[0];
  const lastInitial = customer?.last_name ? ` ${customer.last_name.trim().charAt(0)}.` : "";
  const authorName = `${customer?.first_name?.trim() || "Cliente"}${lastInitial}`;

  const review = await reviews.createProductReviews({
    product_id,
    order_id,
    customer_id: customerId,
    author_name: authorName,
    rating,
    title: title?.trim() || null,
    content,
    status: "pending",
  });

  res.status(201).json({ review: { id: review.id, status: review.status } });
}