using LCU.Library.Internal.IncentiveApiModels.Common;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;

namespace LCU.API.Internal.Operations.IncentiveApiLib.Extensions;

public static class ObjectExtensions
{
    public static IEnumerable<PropertyValueVariance> GetPropertyValueVariances<T>(this T objectInstanceOne, T objectInstanceTwo)
    {
        var propertyValueVariances = new List<PropertyValueVariance>();
        var propertyInfoCollection = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance)
            .Where(property => property.GetCustomAttributes().Any(attribute => attribute is UpdateAllowed));

        foreach (var propertyInfo in propertyInfoCollection)
        {
            if (!Equals(propertyInfo.GetValue(objectInstanceOne), propertyInfo.GetValue(objectInstanceTwo)))
            {
                propertyValueVariances.Add(new PropertyValueVariance
                {
                    ComparedProperty = propertyInfo.Name,
                    PropertyValueOne = GetPropertyValueOrDefaultString(objectInstanceOne, propertyInfo),
                    PropertyValueTwo = GetPropertyValueOrDefaultString(objectInstanceTwo, propertyInfo),
                });
            }
        }

        return propertyValueVariances;
    }

    private static string GetPropertyValueOrDefaultString<T>(this T queryObject, PropertyInfo propertyInfo)
    {
        var propertyValue = propertyInfo.GetValue(queryObject);
        return propertyValue != null ? propertyValue.ToString() : "NULL";
    }
}