using System;
using System.Collections.Generic;
using Dapper;
using DataModel.Helpers;
using DataModel.Models;
using Oracle.ManagedDataAccess.Client;

namespace DataModel.Process
{
    /// <summary>
    /// Item/part number tracking functionality for JDE interface
    /// </summary>
    public partial class JDE
    {
        /// <summary>
        /// Fetches updates for items (part numbers)
        /// </summary>
        /// <param name="lastUpdateDT">Timestamp of last imported data</param>
        /// <returns>Streaming updates for items (part numbers)</returns>
        public static IEnumerable<Item> GetItems(DateTime? lastUpdateDT = null)
        {
            using (OracleConnection connection = GetConnection())
            {
                var results = lastUpdateDT.HasValue ?
                    connection.Query<Item>(queries["SQL_GET_ITEMS_FILTERED"], new { dateUpdated = lastUpdateDT.Value.ToJDEDate(), timeUpdated = lastUpdateDT.Value.ToJDETime() }, buffered: false, commandTimeout: Config.QueryTimeout) :
                    connection.Query<Item>(queries["SQL_GET_ITEMS"], buffered: false, commandTimeout: Config.QueryTimeout);

                foreach (var result in results)
                {
                    yield return result;
                }
            }
        }
    }
}