import { Router } from "@oak/oak";

import {
  APIErrorCode,
  APIException,
  type APIResponse,
  type Category,
  type Dump,
  isCreateCategoryRequest,
  isUpdateCategoryRequest,
  type PaginatedData,
} from "../model/interfaces.ts";

import { authMiddleware, requirePermission } from "../middleware/auth.ts";
import { parseOptionalAuth } from "../lib/auth.ts";
import { parsePagination } from "../lib/pagination.ts";
import {
  createCategory,
  deleteCategory,
  getCategoryBySlug,
  listCategories,
  listDumpsByCategory,
  updateCategory,
} from "../services/category-service.ts";

const router = new Router({ prefix: "/api/categories" });

router.get("/", (ctx) => {
  const responseBody: APIResponse<Category[]> = {
    success: true,
    data: listCategories(),
  };
  ctx.response.body = responseBody;
});

router.get("/:slug", (ctx) => {
  const category = getCategoryBySlug(ctx.params.slug);
  const responseBody: APIResponse<Category> = {
    success: true,
    data: category,
  };
  ctx.response.body = responseBody;
});

router.get("/:slug/dumps", async (ctx) => {
  const requestingUserId = await parseOptionalAuth(ctx) ?? undefined;
  const { page, limit } = parsePagination(ctx.request.url.searchParams);
  const { items, total } = listDumpsByCategory(
    ctx.params.slug,
    page,
    limit,
    requestingUserId,
  );
  const responseBody: APIResponse<PaginatedData<Dump>> = {
    success: true,
    data: { items, total, hasMore: page * limit < total },
  };
  ctx.response.body = responseBody;
});

router.post(
  "/",
  authMiddleware,
  requirePermission("category:manage"),
  async (ctx) => {
    const body = await ctx.request.body.json();
    if (!isCreateCategoryRequest(body)) {
      throw new APIException(
        APIErrorCode.VALIDATION_ERROR,
        400,
        "Invalid category data",
      );
    }
    const category = createCategory(body);
    const responseBody: APIResponse<Category> = {
      success: true,
      data: category,
    };
    ctx.response.status = 201;
    ctx.response.body = responseBody;
  },
);

router.put(
  "/:id",
  authMiddleware,
  requirePermission("category:manage"),
  async (ctx) => {
    const body = await ctx.request.body.json();
    if (!isUpdateCategoryRequest(body)) {
      throw new APIException(
        APIErrorCode.VALIDATION_ERROR,
        400,
        "Invalid category data",
      );
    }
    const category = updateCategory(ctx.params.id, body);
    const responseBody: APIResponse<Category> = {
      success: true,
      data: category,
    };
    ctx.response.body = responseBody;
  },
);

router.delete(
  "/:id",
  authMiddleware,
  requirePermission("category:manage"),
  (ctx) => {
    deleteCategory(ctx.params.id);
    const responseBody: APIResponse<null> = { success: true, data: null };
    ctx.response.body = responseBody;
  },
);

export default router;