import { Router } from "@oak/oak";
import { authMiddleware } from "../middleware/auth.ts";
import {
  type APIResponse,
  type Dump,
  type FollowStatus,
  type PaginatedData,
} from "../model/interfaces.ts";
import {
  followPlaylist,
  followUser,
  getFollowedPlaylistsDumpFeed,
  getFollowedUsersDumpFeed,
  getFollowStatus,
  unfollowPlaylist,
  unfollowUser,
} from "../services/follow-service.ts";

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

// Static routes first to prevent Oak matching "status"/"feed" as a :param

// GET /api/follows/status
router.get("/status", authMiddleware, (ctx) => {
  const status = getFollowStatus(ctx.state.user.userId as string);
  const body: APIResponse<FollowStatus> = { success: true, data: status };
  ctx.response.body = body;
});

// GET /api/follows/feed/users?page=&limit=
router.get("/feed/users", authMiddleware, (ctx) => {
  const page = Math.max(
    1,
    parseInt(ctx.request.url.searchParams.get("page") ?? "1") || 1,
  );
  const limit = Math.min(
    Math.max(
      1,
      parseInt(ctx.request.url.searchParams.get("limit") ?? "20") || 20,
    ),
    100,
  );
  const { items, total } = getFollowedUsersDumpFeed(
    ctx.state.user.userId as string,
    page,
    limit,
  );
  const data: PaginatedData<Dump> = {
    items,
    total,
    hasMore: page * limit < total,
  };
  const body: APIResponse<PaginatedData<Dump>> = { success: true, data };
  ctx.response.body = body;
});

// GET /api/follows/feed/playlists?page=&limit=
router.get("/feed/playlists", authMiddleware, (ctx) => {
  const page = Math.max(
    1,
    parseInt(ctx.request.url.searchParams.get("page") ?? "1") || 1,
  );
  const limit = Math.min(
    Math.max(
      1,
      parseInt(ctx.request.url.searchParams.get("limit") ?? "20") || 20,
    ),
    100,
  );
  const { items, total } = getFollowedPlaylistsDumpFeed(
    ctx.state.user.userId as string,
    page,
    limit,
  );
  const data: PaginatedData<Dump> = {
    items,
    total,
    hasMore: page * limit < total,
  };
  const body: APIResponse<PaginatedData<Dump>> = { success: true, data };
  ctx.response.body = body;
});

// POST /api/follows/users/:userId
router.post("/users/:userId", authMiddleware, (ctx) => {
  followUser(ctx.state.user.userId as string, ctx.params.userId);
  ctx.response.status = 204;
});

// DELETE /api/follows/users/:userId
router.delete("/users/:userId", authMiddleware, (ctx) => {
  unfollowUser(ctx.state.user.userId as string, ctx.params.userId);
  ctx.response.status = 204;
});

// POST /api/follows/playlists/:playlistId
router.post("/playlists/:playlistId", authMiddleware, (ctx) => {
  followPlaylist(ctx.state.user.userId as string, ctx.params.playlistId);
  ctx.response.status = 204;
});

// DELETE /api/follows/playlists/:playlistId
router.delete("/playlists/:playlistId", authMiddleware, (ctx) => {
  unfollowPlaylist(ctx.state.user.userId as string, ctx.params.playlistId);
  ctx.response.status = 204;
});

export default router;