// Copyright (c) 2025 ReactiveUI. All rights reserved.
// Licensed to ReactiveUI under one or more agreements.
// ReactiveUI licenses this file to you under the MIT license.
// See the LICENSE file in the project root for full license information.

using System.Reflection;
using System.Runtime.Versioning;

namespace Splat;

/// <summary>
/// Extension methods that help to get the target framework for a assembly.
/// </summary>
public static class TargetFrameworkExtensions
{
    /// <summary>
    /// Gets the target framework for an assembly.
    /// </summary>
    /// <param name="assembly">The assembly to get the target framework for.</param>
    /// <returns>The target framework or null if not known.</returns>
    public static string? GetTargetFrameworkName(this Assembly assembly)
    {
        var targetFrameworkAttribute = assembly.GetCustomAttribute<TargetFrameworkAttribute>();

        return GetTargetFrameworkName(targetFrameworkAttribute?.FrameworkName);
    }

    internal static string? GetTargetFrameworkName(string? frameworkName) =>
        frameworkName switch
        {
            ".NETCoreApp,Version=v9.0" => "net9.0",
            ".NETCoreApp,Version=v8.0" => "net8.0",
            ".NETCoreApp,Version=v7.0" => "net7.0",
            ".NETCoreApp,Version=v6.0" => "net6.0",
            ".NETCoreApp,Version=v5.0" => "net5.0",
            ".NETCoreApp,Version=v3.1" => "netcoreapp3.1",
            ".NETCoreApp,Version=v3.0" => "netcoreapp3.0",
            ".NETCoreApp,Version=v2.2" => "netcoreapp2.2",
            ".NETCoreApp,Version=v2.1" => "netcoreapp2.1",
            ".NETCoreApp,Version=v2.0" => "netcoreapp2.0",
            ".NETCoreApp,Version=v1.1" => "netcoreapp1.1",
            ".NETCoreApp,Version=v1.0" => "netcoreapp1.0",
            ".NETStandard,Version=v2.1" => "netstandard2.1",
            ".NETStandard,Version=v2.0" => "netstandard2.0",
            ".NETStandard,Version=v1.6" => "netstandard1.6",
            ".NETStandard,Version=v1.5" => "netstandard1.5",
            ".NETStandard,Version=v1.4" => "netstandard1.4",
            ".NETStandard,Version=v1.3" => "netstandard1.3",
            ".NETStandard,Version=v1.2" => "netstandard1.2",
            ".NETStandard,Version=v1.1" => "netstandard1.1",
            ".NETStandard,Version=v1.0" => "netstandard1.0",
            ".NETFramework,Version=v4.8.1" => "net481",
            ".NETFramework,Version=v4.8" => "net48",
            ".NETFramework,Version=v4.7.2" => "net472",
            ".NETFramework,Version=v4.7.1" => "net471",
            ".NETFramework,Version=v4.7" => "net47",
            ".NETFramework,Version=v4.6.2" => "net462",
            ".NETFramework,Version=v4.6.1" => "net461",
            ".NETFramework,Version=v4.6" => "net46",
            ".NETFramework,Version=v4.5.2" => "net452",
            ".NETFramework,Version=v4.5.1" => "net451",
            ".NETFramework,Version=v4.5" => "net45",
            ".NETFramework,Version=v4.0.3" => "net403",
            ".NETFramework,Version=v4.0" => "net40",
            ".NETFramework,Version=v3.5" => "net35",
            ".NETFramework,Version=v2.0" => "net20",
            ".NETFramework,Version=v1.1" => "net11",
            _ => null,
        };
}