import { NextRequest, NextResponse } from "next/server";
import { categoryService } from "@/services/category.service";
import { bankingService } from "@/services/banking.service";
import { requireAuth } from "@/lib/auth-utils";
import type { Category } from "@/lib/types";

export async function GET(request: NextRequest) {
  const authError = await requireAuth();
  if (authError) return authError;

  try {
    const { searchParams } = new URL(request.url);
    const statsOnly = searchParams.get("statsOnly") === "true";

    if (statsOnly) {
      const stats = await bankingService.getCategoryStats();
      return NextResponse.json(stats, {
        headers: {
          "Cache-Control": "public, s-maxage=60, stale-while-revalidate=120",
        },
      });
    }

    return NextResponse.json({ error: "Invalid request" }, { status: 400 });
  } catch (error) {
    console.error("Error fetching category stats:", error);
    return NextResponse.json(
      { error: "Failed to fetch category stats" },
      { status: 500 },
    );
  }
}

export async function POST(request: Request) {
  const authError = await requireAuth();
  if (authError) return authError;
  try {
    const data: Omit<Category, "id"> = await request.json();
    const created = await categoryService.create(data);
    return NextResponse.json(created);
  } catch (error) {
    console.error("Error creating category:", error);
    return NextResponse.json(
      { error: "Failed to create category" },
      { status: 500 },
    );
  }
}

export async function PUT(request: Request) {
  const authError = await requireAuth();
  if (authError) return authError;

  try {
    const category: Category = await request.json();
    const updated = await categoryService.update(category.id, category);
    return NextResponse.json(updated);
  } catch (error) {
    console.error("Error updating category:", error);
    return NextResponse.json(
      { error: "Failed to update category" },
      { status: 500 },
    );
  }
}

export async function DELETE(request: Request) {
  const authError = await requireAuth();
  if (authError) return authError;

  try {
    const { searchParams } = new URL(request.url);
    const id = searchParams.get("id");

    if (!id) {
      return NextResponse.json(
        { error: "Category ID is required" },
        { status: 400 },
      );
    }

    await categoryService.delete(id);
    return NextResponse.json({ success: true });
  } catch (error) {
    console.error("Error deleting category:", error);
    return NextResponse.json(
      { error: "Failed to delete category" },
      { status: 500 },
    );
  }
}