import { NextRequest, NextResponse } from "next/server";
import { db, recipes, users, userFollows, eq, and, ne } from "@epicure/db";
import { requireSession } from "@/lib/api-auth";
import { desc, inArray } from "@epicure/db";

export async function GET(req: NextRequest) {
  const { session, response } = await requireSession();
  if (response) return response;

  const { searchParams } = new URL(req.url);
  const limit = Math.min(parseInt(searchParams.get("limit") ?? "20"), 50);
  const offset = parseInt(searchParams.get("offset") ?? "0");

  // Get IDs of users the current user follows
  const followedRows = await db
    .select({ followingId: userFollows.followingId })
    .from(userFollows)
    .where(eq(userFollows.followerId, session!.user.id));

  const followedIds = followedRows.map((r) => r.followingId);

  if (followedIds.length === 0) {
    return NextResponse.json({ data: [], limit, offset, message: "Follow some users to see their recipes here." });
  }

  const feedRecipes = await db
    .select({
      id: recipes.id,
      title: recipes.title,
      description: recipes.description,
      baseServings: recipes.baseServings,
      prepMins: recipes.prepMins,
      cookMins: recipes.cookMins,
      difficulty: recipes.difficulty,
      visibility: recipes.visibility,
      createdAt: recipes.createdAt,
      updatedAt: recipes.updatedAt,
      authorId: recipes.authorId,
      authorName: users.name,
      authorUsername: users.username,
      authorAvatarUrl: users.avatarUrl,
    })
    .from(recipes)
    .innerJoin(users, eq(recipes.authorId, users.id))
    .where((t) => and(inArray(t.authorId, followedIds), ne(recipes.visibility, "private")))
    .orderBy(desc(recipes.createdAt))
    .limit(limit)
    .offset(offset);

  return NextResponse.json({ data: feedRecipes, limit, offset });
}