namespace FahzeugWPF;

using System.ComponentModel;
using System.Linq.Expressions;
using System.Reflection;
using System.Runtime.CompilerServices;

public abstract class ViewModelBase : INotifyPropertyChanged
{
    #region Events

    [field: NonSerialized]
    public event PropertyChangedEventHandler PropertyChanged;

    protected void OnPropertyChanged(Expression<Func<object>> expression)
    {
        var lambdaExpression = expression as LambdaExpression;

        MemberExpression memberExpression = null;
        if (lambdaExpression.Body is UnaryExpression)
        {
            var unaryExpression = lambdaExpression.Body as UnaryExpression;
            memberExpression = unaryExpression.Operand as MemberExpression;
        }
        else
        {
            memberExpression = lambdaExpression.Body as MemberExpression;
        }

        if (memberExpression != null)
        {
            var propertyInfo = memberExpression.Member as PropertyInfo;
            if (propertyInfo != null)
            {
                OnPropertyChanged(propertyInfo.Name);
            }
        }
    }

    protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    protected bool SetProperty<T>(ref T field, T value, [CallerMemberName] string? propertyName = null)
    {
        if (EqualityComparer<T>.Default.Equals(field, value))
        {
            return false;
        }

        field = value;
        OnPropertyChanged(propertyName);
        return true;
    }
    #endregion Events
}