using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Core;
using Tango.Core.Commands;

namespace Tango.MachineStudio.MachineDesigner.Models
{
    public class HardwareParameter : ExtendedObject
    {
        public event EventHandler Selected;

        public HardwareComponent Component { get; set; }

        public RelayCommand DeleteCommand { get; set; }

        public String PropertyName { get; set; }

        private Object _defaultValue;
        public Object DefaultValue
        {
            get { return _defaultValue; }
            set
            {
                _defaultValue = value;
            }
        }

        public Type Type
        {
            get { return DefaultValue.GetType(); }
        }
        // updated after editing
        private Object _actualValue = null;
        public Object ActualValue
        {
            get { return _actualValue; }
            set
            {
                _actualValue = value;
                RaisePropertyChangedAuto();
                RaisePropertyChanged(nameof(IsDifferent));
                RaisePropertyChanged(nameof(IsValuesMatched));
            }
        }

        // displayed during  editing
        private Object _editableValue = null;
        public Object EditableValue
        {
            get { return _editableValue; }
            set
            {
                _editableValue = value;
                RaisePropertyChangedAuto();
            }
        }

        private bool _isSelected;
        public bool IsSelected
        {
            get { return _isSelected; }
            set
            {
                _isSelected = value;

                OnIsSelectedChanged();

                RaisePropertyChangedAuto();
                if (_isSelected)
                {
                    Selected?.Invoke(this, new EventArgs());
                }
            }
        }


        private void OnIsSelectedChanged()
        {
            if (IsSelected)
            {
                EditableValue = ActualValue != null ? ActualValue : DefaultValue;
            }
            else
            {
                if (EditableValue != null)
                {
                    ActualValue = EditableValue;
                }
            }
        }

        public bool IsDifferent
        {
            get
            {
                return (ActualValue != null);
            }
        }

        public bool IsValuesMatched
        {
            get
            {
                return ActualValue != null && ActualValue.ToString() == DefaultValue.ToString();
            }
        }

        public void DeleteValue()
        {
            ActualValue = null;
            EditableValue = null;
        }

        public HardwareParameter()
        {
            DeleteCommand = new RelayCommand(DeleteValue);
        }
    }
}