using System.Diagnostics.CodeAnalysis;
using AyCode.Utils.Extensions;
using LinqToDB.Common;
using Nop.Core;
using Nop.Core.Domain.Common;

namespace Mango.Nop.Core.Extensions;

public static class GenericAttributeExtensions
{
    public static TValue? GetValueOrNull<TValue>(this IEnumerable<GenericAttribute> src, string key) where TValue : struct
    {
        var ga = src.SingleOrDefault(x => x.Key == key);
        if (ga == null || ga.Value.IsNullOrWhiteSpace()) return null;

        return CommonHelper.To<TValue>(ga.Value);
    }

    public static TValue GetValueOrDefault<TValue>(this IEnumerable<GenericAttribute> src, string key, TValue defaultValue = default) where TValue : struct
    {
        var gaValue = GetValueOrNull<TValue>(src, key);
        return gaValue == null ? defaultValue : CommonHelper.To<TValue>(gaValue);
    }

    public static bool TryGetValue<TValue>(this IEnumerable<GenericAttribute> src, string key, [NotNullWhen(true)] out TValue? value) where TValue : struct
    {
        value = null;

        var gaValue = GetValueOrNull<TValue>(src, key);
        if (gaValue == null) return false;

        value = CommonHelper.To<TValue>(gaValue);
        return true;
    }
}