import { NextRequest, NextResponse } from "next/server";
import { getDb } from "@/lib/db";

export async function GET(
  _request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const sql = getDb();
    const { id } = await params;

    const plRows = await sql(
      `SELECT spl.*,
         s.name AS supplier_name,
         s.code AS supplier_code,
         s.email AS supplier_email,
         s.phone AS supplier_phone,
         s.address AS supplier_address,
         s.contact_person AS supplier_contact
       FROM supplier_packing_lists spl
       JOIN suppliers s ON s.id = spl.supplier_id
       WHERE spl.id = $1`,
      [Number(id)]
    );

    if (plRows.length === 0) {
      return NextResponse.json({ error: "Supplier packing list not found" }, { status: 404 });
    }

    // Fetch items with component details and products where each component is used
    const items = await sql(
      `SELECT spli.*,
         c.part_number,
         c.name AS component_name,
         (
           SELECT STRING_AGG(DISTINCT p.name, ', ' ORDER BY p.name)
           FROM bom_items bi
           JOIN products p ON p.id = bi.product_id
           WHERE bi.component_id = spli.component_id
         ) AS used_in_products
       FROM supplier_packing_list_items spli
       JOIN components c ON c.id = spli.component_id
       WHERE spli.supplier_packing_list_id = $1
       ORDER BY spli.id ASC`,
      [Number(id)]
    );

    return NextResponse.json({ ...plRows[0], items });
  } catch (error) {
    console.error("[v0] Supplier packing list detail GET error:", error);
    return NextResponse.json(
      { error: error instanceof Error ? error.message : "Failed to fetch supplier packing list" },
      { status: 500 }
    );
  }
}

export async function DELETE(
  _request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const sql = getDb();
    const { id } = await params;

    const plRows = await sql(
      `SELECT * FROM supplier_packing_lists WHERE id = $1`,
      [Number(id)]
    );
    if (plRows.length === 0) {
      return NextResponse.json({ error: "Supplier packing list not found" }, { status: 404 });
    }

    // Delete items then packing list
    await sql(`DELETE FROM supplier_packing_list_items WHERE supplier_packing_list_id = $1`, [Number(id)]);
    await sql(`DELETE FROM supplier_packing_lists WHERE id = $1`, [Number(id)]);

    return NextResponse.json({ success: true });
  } catch (error) {
    console.error("[v0] Supplier packing list DELETE error:", error);
    return NextResponse.json(
      { error: error instanceof Error ? error.message : "Failed to delete supplier packing list" },
      { status: 500 }
    );
  }
}