using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Bowin.Common.Utility;
using EMIS.DataLogic.SystemDAL;

namespace EMIS.CommonLogic.SystemServices
{
    public class ParameterServices : BaseServices, IParameterServices
    {
        public ParameterDAL ParameterDAL { get; set; }

        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="parameterType"></param>
        /// <returns></returns>
        public Nullable<T> GetParameterValue<T>(ViewModel.CF_ParameterType parameterType) where T : struct
        {
            var parameter = ParameterDAL.ParameterRepository.GetSingle(x => x.ParameterTypeID == (int)parameterType);

            if (parameter == null || string.IsNullOrEmpty(parameter.Value)) return null;
            T result;
            if (parameter.Value.TryParseTo(out result))
            {
                return result;
            }
            return null;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="parameterType"></param>
        /// <returns></returns>
        public string GetParameterValue(ViewModel.CF_ParameterType parameterType)
        {
            var parameter = ParameterDAL.ParameterRepository.GetSingle(x => x.ParameterTypeID == (int)parameterType);

            if (parameter == null || string.IsNullOrEmpty(parameter.Value)) return null;
            return parameter.Value;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="parameterType"></param>
        /// <param name="value"></param>
        public void SaveTo(ViewModel.CF_ParameterType parameterType, object value)
        {
            var parameter = ParameterDAL.ParameterRepository.GetSingle(x => x.ParameterTypeID == (int)parameterType);

            if (parameter == null)
            {
                parameter = new Entities.CF_Parameter();

                parameter.ParameterID = Guid.NewGuid();
                parameter.ParameterTypeID = (int)parameterType;
                if (value != null)
                {
                    parameter.Value = value.ToString();
                }
                else 
                {
                    parameter.Value = null;
                }

                this.SetNewStatus(parameter);
                this.UnitOfWork.Add(parameter);
            }
            else
            {
                if (value != null)
                {
                    parameter.Value = value.ToString();
                }
                else
                {
                    parameter.Value = null;
                }
                this.SetModifyStatus(parameter);
            }

            this.UnitOfWork.Commit();
        }

    }
}