// <copyright file="EntityHelpers.cs" company="alveus.dev">
// Copyright (c) alveus.dev. All rights reserved. Licensed under the MIT License.
// </copyright>

namespace Astral.Services.Helpers;

/// <summary>
/// Entity helpers.
/// </summary>
public static class EntityHelpers
{
    /// <summary>
    /// Apply changes only when new entity property is different and not null.
    /// </summary>
    /// <param name="oldEntity">Old entity to compare against.</param>
    /// <param name="newEntity">New entity with new values.</param>
    /// <typeparam name="TEntity">The type of entity to compare.</typeparam>
    /// <returns>The new entity with changes applied.</returns>
    public static TEntity ApplyChanges<TEntity>(TEntity oldEntity, TEntity newEntity)
    {
        var entityType = typeof(TEntity);
        var properties = entityType.GetProperties();
        foreach (var property in properties)
        {
            if (property.GetValue(newEntity) != null && property.GetValue(newEntity) != property.GetValue(oldEntity))
            {
                property.SetValue(oldEntity, property.GetValue(newEntity));
            }
            else
            {
                property.SetValue(oldEntity, property.GetValue(oldEntity));
            }
        }

        return oldEntity;
    }
}