// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.IO;
using Microsoft.Build.Shared;
using Shouldly;
using Xunit;
 
#nullable disable
 
namespace Microsoft.Build.Framework.UnitTests
{
    public class FileClassifierTests
    {
        [Fact]
        public void Shared_ReturnsInstance()
        {
            FileClassifier.Shared.ShouldNotBeNull();
        }
 
        [Fact]
        public void IsNonModifiable_EvaluatesModifiability()
        {
            FileClassifier classifier = new();
 
            var volume = NativeMethodsShared.IsWindows ? @"X:\" : "/home/usr";
            classifier.RegisterImmutableDirectory($"{Path.Combine(volume, "Test1")}");
            classifier.RegisterImmutableDirectory($"{Path.Combine(volume, "Test2")}");
 
            classifier.IsNonModifiable(Path.Combine(volume, "Test1", "File.ext")).ShouldBeTrue();
            classifier.IsNonModifiable(Path.Combine(volume, "Test2", "File.ext")).ShouldBeTrue();
            classifier.IsNonModifiable(Path.Combine(volume, "Test3", "File.ext")).ShouldBeFalse();
        }
 
        [Fact]
        public void IsNonModifiable_DuplicateNugetRegistry_EvaluatesModifiability()
        {
            FileClassifier classifier = new();
 
            var volume = NativeMethodsShared.IsWindows ? @"X:\" : "/home/usr";
 
            for (int i = 0; i < 3; ++i)
            {
                classifier.RegisterImmutableDirectory($"{Path.Combine(volume, "Test1")}");
                classifier.RegisterImmutableDirectory($"{Path.Combine(volume, "Test2")}");
            }
 
            classifier.IsNonModifiable(Path.Combine(volume, "Test1", "File.ext")).ShouldBeTrue();
            classifier.IsNonModifiable(Path.Combine(volume, "Test2", "File.ext")).ShouldBeTrue();
            classifier.IsNonModifiable(Path.Combine(volume, "Test3", "File.ext")).ShouldBeFalse();
        }
 
        [Fact]
        public void IsNonModifiable_RespectsOSCaseSensitivity()
        {
            FileClassifier classifier = new();
 
            var volume = NativeMethodsShared.IsWindows ? @"X:\" : "/home/usr";
            classifier.RegisterImmutableDirectory($"{Path.Combine(volume, "Test1")}");
 
            if (NativeMethodsShared.IsLinux)
            {
                classifier.IsNonModifiable(Path.Combine(volume, "Test1", "File.ext")).ShouldBeTrue();
                classifier.IsNonModifiable(Path.Combine(volume, "test1", "File.ext")).ShouldBeFalse();
            }
            else
            {
                classifier.IsNonModifiable(Path.Combine(volume, "Test1", "File.ext")).ShouldBeTrue();
                classifier.IsNonModifiable(Path.Combine(volume, "test1", "File.ext")).ShouldBeTrue();
            }
        }
 
        [Fact]
        public void IsNonModifiable_DoesntThrowWhenPackageFoldersAreNotRegistered()
        {
            FileClassifier classifier = new();
 
            classifier.IsNonModifiable("X:\\Test3\\File.ext").ShouldBeFalse();
        }
    }
}