using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;

namespace Haftmittel
{
    public class Skladnik : INotifyPropertyChanged, IDataErrorInfo
    {
        private Int32 _id = 0;
        private decimal _procent = 0;
        private decimal _procentDo = 0;
        private List<Historia> _Historia;

        public Int32 Id
        {
            get { return _id; }
            set
            {
                _id = value;

                if (_id == 0)
                {
                    Procent = 0;
                    OnPropertyChanged("Procent");
                }

                OnPropertyChanged("Id");
            }
        }

        public decimal Procent
        {
            get { return _procent; }
            set
            {
                _procent = value;
                OnPropertyChanged("Procent");
                OnPropertyChanged("ProcentDo");
            }
        }

        public decimal ProcentDo
        {
            get { return _procentDo; }
            set
            {
                _procentDo = value;
                OnPropertyChanged("ProcentDo");
                OnPropertyChanged("Procent");
            }
        }

        /// <summary>
        /// Historia zmian wartości
        /// </summary>
        public List<Historia> Historia
        {
            get { return _Historia; }
            set { _Historia = value; }
        }

        /// <summary>
        /// Historia zmian typu
        /// </summary>
        public List<Historia> Historia_Id
        { get; set; }

        /// <summary>
        /// Historia zmian wartości ProcentDo
        /// </summary>
        public List<Historia> Historia_Do
        { get; set; }
        
        #region Obsługa INotifyPropertyChanged
        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged(string name)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(name));
            }
        }
        #endregion

        #region Obsługa IDataErrorInfo
        public string Error
        {
            get { throw new NotImplementedException(); }
        }

        public string this[string columnName]
        {
            get
            {
                string result = null;

                #region Procent
                if (columnName == "Procent")
                {
                    if (Procent < 0 || Procent > 100)
                        result = "tylko wartości od 0 do 100";
                }
                #endregion

                #region ProcentDo
                if (columnName == "ProcentDo")
                {
                    if (ProcentDo < 0 || ProcentDo > 100)
                        result = "tylko wartości od 0 do 100";
                }
                #endregion

                #region Procent
                if (columnName == "Procent" || columnName == "ProcentDo")
                {
                    if (Procent > ProcentDo)
                        result = "niewłaściwe wartości";
                }
                #endregion
                return result;
            }
        }
        #endregion
    }
}