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

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

    const planRows = await sql(
      `SELECT * FROM planning_history WHERE id = $1`,
      [Number(id)]
    );
    if (planRows.length === 0) {
      return NextResponse.json({ error: "Not found" }, { status: 404 });
    }

    // Fetch items with PO info only if the component actually exists in the PO
    const items = await sql(
      `SELECT phi.*, phi.stock_at_time AS stock_snapshot,
        (SELECT sp.po_number FROM supplier_pos sp
         JOIN supplier_po_items spi ON spi.supplier_po_id = sp.id
         WHERE sp.planning_id = phi.planning_id 
           AND spi.component_id = phi.component_id
         ORDER BY sp.created_at DESC
         LIMIT 1) AS po_number,
        (SELECT sp.status FROM supplier_pos sp
         JOIN supplier_po_items spi ON spi.supplier_po_id = sp.id
         WHERE sp.planning_id = phi.planning_id 
           AND spi.component_id = phi.component_id
         ORDER BY sp.created_at DESC
         LIMIT 1) AS po_status
       FROM planning_history_items phi
       WHERE phi.planning_id = $1 ORDER BY phi.component_name ASC`,
      [Number(id)]
    );

    return NextResponse.json({ ...planRows[0], items });
  } catch (error) {
    console.error("Error fetching planning detail:", error);
    return NextResponse.json(
      { error: "Failed to fetch planning detail" },
      { status: 500 }
    );
  }
}

export async function DELETE(
  _request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const { id } = await params;
    const sql = getDb();
    await sql(`DELETE FROM planning_history_items WHERE planning_id = $1`, [Number(id)]);
    await sql(`DELETE FROM planning_history WHERE id = $1`, [Number(id)]);
    return NextResponse.json({ success: true });
  } catch (error) {
    console.error("Error deleting planning:", error);
    return NextResponse.json(
      { error: "Failed to delete planning" },
      { status: 500 }
    );
  }
}