/**
 * Available Coils Service
 *
 * Queries Epicor for coils available for allocation to a specific job.
 * The legacy system used CoilAllocation.sql with JobNum + DBNAME params.
 * This queries PartLot/PartBin data filtered by job number.
 */

import { execQuery, getPortalDbName } from '@/lib/epicor';
import type { AvailableCoilItem } from '@/types/requests';

type EpicorCoilRow = {
  PartNum: string;
  LotNum: string | null;
  CoilNum: string | null;
  OnHandQty: number;
  Plant: string | null;
  Warehouse: string | null;
};

/**
 * Get available coils for allocation to a specific job.
 *
 * This is a best-effort query — the legacy CoilAllocation.sql may not be available
 * as a view in the current Epicor database. If the query fails, we return an empty
 * array gracefully.
 */
export async function getAvailableCoils(
  custId: string,
  dbName: string,
  jobNumber: string
): Promise<AvailableCoilItem[]> {
  try {
    // Try the portal coil allocation view/query
    // Legacy used: SELECT ... FROM CoilAllocation WHERE JobNum = @JobNum AND DBNAME = @DBNAME
    const query = `
      SELECT
        PartNum,
        LotNum,
        CoilNum,
        OnHandQty,
        Plant,
        WarehouseCode AS Warehouse
      FROM portal_CoilAllocation
      WHERE JobNum = @JobNum
      ORDER BY PartNum, LotNum, CoilNum
    `;

    const rows = await execQuery<EpicorCoilRow[]>(query, {
      JobNum: jobNumber,
    });

    return rows.map((row) => ({
      part_num: row.PartNum?.trim() ?? '',
      lot_num: row.LotNum?.trim() || null,
      coil_number: row.CoilNum?.trim() || null,
      on_hand_qty: Number(row.OnHandQty ?? 0),
      plant: row.Plant?.trim() || null,
      warehouse: row.Warehouse?.trim() || null,
    }));
  } catch (error) {
    // The coil allocation view may not exist yet — fail gracefully
    console.warn(
      '[available-coils] Failed to query coil allocation data. ' +
        'The portal_CoilAllocation view may need to be created in Epicor.',
      error instanceof Error ? error.message : error
    );
    return [];
  }
}