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 pl.*,
         po.po_number,
         po.customer_ref,
         po.order_date,
         c.name AS customer_name,
         c.code AS customer_code,
         c.email AS customer_email,
         c.phone AS customer_phone,
         c.address AS customer_address,
         c.contact_person AS customer_contact,
         p.name AS product_name,
         p.sku AS product_sku
       FROM packing_lists pl
       JOIN purchase_orders po ON po.id = pl.purchase_order_id
       JOIN customers c ON c.id = po.customer_id
       JOIN purchase_order_items poi ON poi.id = pl.po_item_id
       JOIN products p ON p.id = poi.product_id
       WHERE pl.id = $1`,
      [Number(id)]
    );

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

    const serials = await sql(
      `SELECT * FROM packing_list_serials WHERE packing_list_id = $1 ORDER BY id ASC`,
      [Number(id)]
    );

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

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

    // Get the packing list details to reverse shipped_quantity
    const plRows = await sql(
      `SELECT * FROM packing_lists WHERE id = $1`,
      [Number(id)]
    );
    if (plRows.length === 0) {
      return NextResponse.json({ error: "Packing list not found" }, { status: 404 });
    }

    const pl = plRows[0];

    // Delete serials
    await sql(`DELETE FROM packing_list_serials WHERE packing_list_id = $1`, [Number(id)]);

    // Delete packing list
    await sql(`DELETE FROM packing_lists WHERE id = $1`, [Number(id)]);

    // Reverse the shipped_quantity
    await sql(
      `UPDATE purchase_order_items SET shipped_quantity = GREATEST(0, COALESCE(shipped_quantity, 0) - $1) WHERE id = $2`,
      [Number(pl.quantity), Number(pl.po_item_id)]
    );

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