// 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 System;
using System.Collections.Generic;
using System.Linq;

namespace Microsoft.DotNet.Build.Tasks.Packaging;

[MSBuildMultiThreadableTask]
public class GetPackageVersion : Task
{
    [Required]
    public ITaskItem[] Files
    {
        get;
        set;
    }

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

    public override bool Execute()
    {
        if (Files == null || Files.Length == 0)
        {
            Log.LogError("Files argument must be specified");
            return false;
        }

        var versionsToConsider = Files.Where(f => !String.IsNullOrEmpty(f.GetMetadata("AssemblyVersion")))
                                      .Select(f =>  new Version(f.GetMetadata("AssemblyVersion")));

        if (versionsToConsider.Any())
        {
            // use the version of the highest reference assembly;
            Version = versionsToConsider.Max().ToString();
        }

        return !Log.HasLoggedErrors;
    }
}