// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
#nullable disable
 
using Roslyn.Test.Utilities;
using Roslyn.Utilities;
using Xunit;
 
namespace Microsoft.CodeAnalysis.UnitTests
{
    public sealed class FilePathUtilitiesTests
    {
        [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/1579")]
        public void GetRelativePath_SameDirectory()
        {
            var baseDirectory = @"C:\Alpha\Beta\Gamma";
            var fullPath = @"C:\Alpha\Beta\Gamma\Doc.txt";
 
            var result = PathUtilities.GetRelativePath(baseDirectory, fullPath);
 
            Assert.Equal(expected: @"Doc.txt", actual: result);
        }
 
        [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/1579")]
        public void GetRelativePath_NestedOneLevelDown()
        {
            var baseDirectory = @"C:\Alpha\Beta\Gamma";
            var fullPath = @"C:\Alpha\Beta\Gamma\Delta\Doc.txt";
 
            var result = PathUtilities.GetRelativePath(baseDirectory, fullPath);
 
            Assert.Equal(expected: @"Delta\Doc.txt", actual: result);
        }
 
        [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/1579")]
        public void GetRelativePath_NestedTwoLevelsDown()
        {
            var baseDirectory = @"C:\Alpha\Beta\Gamma";
            var fullPath = @"C:\Alpha\Beta\Gamma\Delta\Epsilon\Doc.txt";
 
            var result = PathUtilities.GetRelativePath(baseDirectory, fullPath);
 
            Assert.Equal(expected: @"Delta\Epsilon\Doc.txt", actual: result);
        }
 
        [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/1579")]
        public void GetRelativePath_UpOneLevel()
        {
            var baseDirectory = @"C:\Alpha\Beta\Gamma";
            var fullPath = @"C:\Alpha\Beta\Doc.txt";
 
            var result = PathUtilities.GetRelativePath(baseDirectory, fullPath);
 
            Assert.Equal(expected: @"..\Doc.txt", actual: result);
        }
 
        [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/1579")]
        public void GetRelativePath_UpTwoLevels()
        {
            var baseDirectory = @"C:\Alpha\Beta\Gamma";
            var fullPath = @"C:\Alpha\Doc.txt";
 
            var result = PathUtilities.GetRelativePath(baseDirectory, fullPath);
 
            Assert.Equal(expected: @"..\..\Doc.txt", actual: result);
        }
 
        [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/1579")]
        public void GetRelativePath_UpTwoLevelsAndThenDown()
        {
            var baseDirectory = @"C:\Alpha\Beta\Gamma";
            var fullPath = @"C:\Alpha\Phi\Omega\Doc.txt";
 
            var result = PathUtilities.GetRelativePath(baseDirectory, fullPath);
 
            Assert.Equal(expected: @"..\..\Phi\Omega\Doc.txt", actual: result);
        }
 
        [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/1579")]
        public void GetRelativePath_OnADifferentDrive()
        {
            var baseDirectory = @"C:\Alpha\Beta\Gamma";
            var fullPath = @"D:\Alpha\Beta\Gamma\Doc.txt";
 
            var result = PathUtilities.GetRelativePath(baseDirectory, fullPath);
 
            Assert.Equal(expected: @"D:\Alpha\Beta\Gamma\Doc.txt", actual: result);
        }
 
        [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/4660")]
        public void GetRelativePath_WithBaseDirectoryMatchingIncompletePortionOfFullPath()
        {
            var baseDirectory = @"C:\Alpha\Beta";
            var fullPath = @"C:\Alpha\Beta2\Gamma";
 
            var result = PathUtilities.GetRelativePath(baseDirectory, fullPath);
 
            Assert.Equal(expected: @"..\Beta2\Gamma", actual: result);
        }
 
        [ConditionalTheory(typeof(WindowsOnly)), WorkItem(72043, "https://github.com/dotnet/roslyn/issues/72043")]
        [InlineData(@"C:\Alpha", @"C:\", @"..")]
        [InlineData(@"C:\Alpha\Beta", @"C:\", @"..\..")]
        [InlineData(@"C:\Alpha\Beta", @"C:\Gamma", @"..\..\Gamma")]
        public void GetRelativePath_WithFullPathShorterThanBasePath_Windows(string baseDirectory, string fullPath, string expected)
        {
            var result = PathUtilities.GetRelativePath(baseDirectory, fullPath);
 
            Assert.Equal(expected, result);
        }
 
        [ConditionalTheory(typeof(UnixLikeOnly)), WorkItem(72043, "https://github.com/dotnet/roslyn/issues/72043")]
        [InlineData("/Alpha", "/", "..")]
        [InlineData("/Alpha/Beta", "/", "../..")]
        [InlineData("/Alpha/Beta", "/Gamma", "../../Gamma")]
        public void GetRelativePath_WithFullPathShorterThanBasePath_Unix(string baseDirectory, string fullPath, string expected)
        {
            var result = PathUtilities.GetRelativePath(baseDirectory, fullPath);
 
            Assert.Equal(expected, result);
        }
    }
}