using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using Dapper;
using DataModel.Models;
using DataModel.ViewModels;

namespace DataModel.Process
{
    /// <summary>
    /// Lot tracking functions for LotFinderDB interface
    /// </summary>
    public partial class LotFinderDB
    {
        /// <summary>
        /// Query to find lots with matching lot numbers
        /// </summary>
        private const string SQL_LOOKUP_LOTS = @"
            SELECT  DISTINCT 
                    l.LotNumber,
                    l.BranchCode,
                    l.ShortItemNumber,
                    l.ItemNumber,
                    l.SupplierCode,
                    l.LastUpdateDT
            FROM    dbo.Lot AS l INNER JOIN 
	               @lotNumbers ln ON (l.LotNumber = ln.ComponentLotNumber AND 
		                            ((l.ItemNumber IS NULL AND ln.ItemNumber IS NULL) OR l.ItemNumber = ln.ItemNumber))";

        /// <summary>
        /// Finds lots with matching lot numbers
        /// </summary>
        /// <param name="lots">Lot numbers to match</param>
        /// <returns>List of matching lots</returns>
        public static List<Lot> LookupLots(List<LotViewModel> lots)
        {
            List<Lot> results = new List<Lot>();

            try
            {
                //Create search filter parameter
                DataTable dataTable = new DataTable();
                dataTable.Columns.Add("ComponentLotNumber", typeof(string));
                dataTable.Columns.Add("ItemNumber", typeof(string));

                foreach (LotViewModel lot in lots)
                {
                    dataTable.Rows.Add(lot.LotNumber, lot.ItemNumber);
                }

                using (SqlConnection connection = GetConnection())
                {
                    results = connection.Query<Lot>(SQL_LOOKUP_LOTS, new { lotNumbers = dataTable.AsTableValuedParameter("ComponentLotFilterParameter") }).ToList();
                }
            }
            catch (Exception error)
            {
                //Log and forward exception
                logger.Error("LookupLots: failed to find matching lots: {0}.", error.Message);
                throw new Exception("LookupLots: failed to find matching lots in LotFinderDB.", error);
            }

            return results;
        }
    }
}