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

export async function GET() {
  try {
    const sql = getDb();
    const rows = await sql(
      `SELECT ph.*,
        COUNT(phi.id) AS item_count,
        COALESCE(SUM(phi.quantity_needed), 0) AS total_quantity,
        COUNT(CASE WHEN phi.shortage > 0 THEN 1 END) AS shortage_count,
        (SELECT string_agg(DISTINCT sp.po_number, ', ' ORDER BY sp.po_number) 
         FROM supplier_pos sp WHERE sp.planning_id = ph.id) AS linked_po_numbers
       FROM planning_history ph
       LEFT JOIN planning_history_items phi ON phi.planning_id = ph.id
       GROUP BY ph.id
       ORDER BY ph.created_at DESC`
    );
    return NextResponse.json(rows);
  } catch (error) {
    console.error("Error fetching planning history:", error);
    return NextResponse.json(
      { error: "Failed to fetch planning history" },
      { status: 500 }
    );
  }
}