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

namespace NNTCPApp
{
    /// <summary>
    /// Abstract Class create a collection of properties, and updates binding elements in view
    /// it's also used has a base class
    /// </summary>
    public abstract class ViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual bool PropertyHasChanged([CallerMemberName] String propertyName = "")
        {
            if (PropertyChanged == null)
                return false;

            PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propertyName));

            return true;
        }

        /// <summary>
        /// This method is called by the Set accessor of each property.  
        /// The CallerMemberName attribute that is applied to the optional propertyName   
        /// parameter causes the property name of the caller to be substituted as an argument. 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="value"></param>
        /// <param name="propertyName"></param>
        protected void SetValue<T>(T value, [CallerMemberName] String propertyName = "")
        {
            if (string.IsNullOrEmpty(propertyName))
                return;

            _properties[propertyName] = value;

            PropertyHasChanged(propertyName);
        }

        /// <summary>
        /// This method is called by the Get accessor of each property
        /// The CallerMemberName attribute that is applied to the optional propertyName   
        /// parameter causes the property name of the caller to be substituted as an argument. 
        /// Returns stored property value
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="propertyName"></param>
        /// <returns></returns>
        protected T GetValue<T>([CallerMemberName] String propertyName = "")
        {
            _properties.TryGetValue(propertyName, out object value);
            return (T)value;
        }


        //Store a collection of properties
        private Dictionary<string, object> _properties { get; } = new Dictionary<string, object>();
    }
}