// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;
using NuGet.Frameworks;
using System;
using System.Collections.Generic;
using System.Linq;

namespace Microsoft.DotNet.Build.Tasks.Packaging;

[MSBuildMultiThreadableTask]
public class GetMinimumNETStandard : Task
{
    [Required]
    public ITaskItem[] Frameworks
    {
        get;
        set;
    }

    [Output]
    public string MinimumNETStandard
    {
        get;
        private set;
    }

    public override bool Execute()
    {
        var minNETStandard = Frameworks.Select(fx => NuGetFramework.Parse(fx.ItemSpec))
            .Where(fx => fx.Framework == FrameworkConstants.FrameworkIdentifiers.NetStandard)
            .OrderBy(fx => fx.Version)
            .FirstOrDefault();

        if (minNETStandard == null)
        {
            minNETStandard = FrameworkConstants.CommonFrameworks.NetStandard10;
            Log.LogMessage($"Could not find any NETStandard frameworks, defaulting to {minNETStandard}.");
        }

        MinimumNETStandard = minNETStandard.ToString();

        return !Log.HasLoggedErrors;
    }
}