using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;

namespace Haftmittel
{
    public class Skladnik : INotifyPropertyChanged, IDataErrorInfo
    {
        private int _id = 0;
        private decimal _procent = 0;
        private decimal _procentDo = 0;

        public int Id
        {
            get => _id;
            set
            {
                _id = value;

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

                OnPropertyChanged();
            }
        }

        public decimal Procent
        {
            get => _procent;
            set
            {
                _procent = value;
                OnPropertyChanged();
                OnPropertyChanged(nameof(ProcentDo));
            }
        }

        public decimal ProcentDo
        {
            get => _procentDo;
            set
            {
                _procentDo = value;
                OnPropertyChanged();
                OnPropertyChanged(nameof(Procent));
            }
        }

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

        /// <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([CallerMemberName] string name = null) => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
        #endregion

        #region Obsługa IDataErrorInfo
        public string Error => 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
    }
}