// Copyright (c) .NET Foundation and contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

using System;
using System.IO;
using System.Linq;
using System.Xml.Linq;
using FluentAssertions;
using Microsoft.DotNet.Tools.Test.Utilities;
using Microsoft.Extensions.DependencyModel;
using Xunit;

namespace Microsoft.DotNet.New.Tests
{
    public class GivenThatIWantANewApp : TestBase
    {
        [Fact]
        public void When_dotnet_new_is_invoked_mupliple_times_it_should_fail()
        {
            var rootPath = TestAssets.CreateTestDirectory().FullName;

            new NewCommand()
                .WithWorkingDirectory(rootPath)
                .Execute($"console --debug:ephemeral-hive");

            DateTime expectedState = Directory.GetLastWriteTime(rootPath);

            var result = new NewCommand()
                .WithWorkingDirectory(rootPath)
                .ExecuteWithCapturedOutput($"console --debug:ephemeral-hive");

            DateTime actualState = Directory.GetLastWriteTime(rootPath);

            Assert.Equal(expectedState, actualState);

            result.Should().Fail();
        }

        [Fact]
        public void RestoreDoesNotUseAnyCliProducedPackagesOnItsTemplates()
        {
            string[] cSharpTemplates = new[] { "console", "classlib", "mstest", "xunit", "web", "mvc", "webapi" };

            var rootPath = TestAssets.CreateTestDirectory().FullName;
            var packagesDirectory = Path.Combine(rootPath, "packages");

            foreach (string cSharpTemplate in cSharpTemplates)
            {
                var projectFolder = Path.Combine(rootPath, cSharpTemplate + "1");
                Directory.CreateDirectory(projectFolder);
                CreateAndRestoreNewProject(cSharpTemplate, projectFolder, packagesDirectory);
            }

            Directory.EnumerateFiles(packagesDirectory, $"*.nupkg", SearchOption.AllDirectories)
                .Should().NotContain(p => p.Contains("Microsoft.DotNet.Cli.Utils"));
        }

        private void CreateAndRestoreNewProject(
            string projectType,
            string projectFolder,
            string packagesDirectory)
        {
            new NewCommand()
                .WithWorkingDirectory(projectFolder)
                .Execute($"{projectType} --debug:ephemeral-hive")
                .Should().Pass();

            new RestoreCommand()
                .WithWorkingDirectory(projectFolder)
                .Execute($"--packages {packagesDirectory}")
                .Should().Pass();
        }

        [Theory]
        [InlineData("console", "RuntimeFrameworkVersion", "microsoft.netcore.app")]
        [InlineData("classlib", "NetStandardImplicitPackageVersion", "netstandard.library")]
        public void NewProjectRestoresCorrectPackageVersion(string type, string propertyName, string packageName)
        {
            // These will fail when templates stop including explicit version.
            // Collapse back to one method and remove the explicit version handling when that happens.
            NewProjectRestoresCorrectPackageVersion(type, propertyName, packageName, deleteExplicitVersion: true);
            NewProjectRestoresCorrectPackageVersion(type, propertyName, packageName, deleteExplicitVersion: false);
        }

        private void NewProjectRestoresCorrectPackageVersion(string type, string propertyName, string packageName, bool deleteExplicitVersion)
        {
            var rootPath = TestAssets.CreateTestDirectory(identifier: $"_{type}_{deleteExplicitVersion}").FullName;
            var packagesDirectory = Path.Combine(rootPath, "packages");
            var projectName = "Project";
            var expectedVersion = GetFrameworkPackageVersion();

            new NewCommand()
                .WithWorkingDirectory(rootPath)
                .Execute($"{type} --name {projectName} -o .")
                .Should().Pass();

            ValidateAndRemoveExplicitVersion();

            new RestoreCommand()
                .WithWorkingDirectory(rootPath)
                .Execute($"--packages {packagesDirectory}")
                .Should().Pass();

            new DirectoryInfo(Path.Combine(packagesDirectory, packageName))
                .Should().Exist()
                .And.HaveDirectory(expectedVersion);

            string GetFrameworkPackageVersion()
            {
                var dotnetDir = new FileInfo(DotnetUnderTest.FullName).Directory;
                var sharedFxDir = dotnetDir
                    .GetDirectory("shared", "Microsoft.NETCore.App")
                    .EnumerateDirectories()
                    .Single(d => d.Name.StartsWith("2.0.0"));

                if (packageName == "microsoft.netcore.app")
                {
                    return sharedFxDir.Name;
                }

                var depsFile = Path.Combine(sharedFxDir.FullName, "Microsoft.NETCore.App.deps.json");
                using (var stream = File.OpenRead(depsFile))
                using (var reader = new DependencyContextJsonReader())
                {
                    var context = reader.Read(stream);
                    var dependency = context
                        .RuntimeLibraries
                        .Single(library => library.Name == packageName);

                    return dependency.Version;
                }
            }

            // Remove when templates stop putting an explicit version
            void ValidateAndRemoveExplicitVersion()
            {
                var projectFileName = $"{projectName}.csproj";
                var projectPath = Path.Combine(rootPath, projectFileName);
                var projectDocument = XDocument.Load(projectPath);
                var explicitVersionNode = projectDocument
                   .Elements("Project")
                   .Elements("PropertyGroup")
                   .Elements(propertyName)
                   .SingleOrDefault();

                explicitVersionNode.Should().NotBeNull();
                explicitVersionNode.Value.Should().Be(expectedVersion);

                if (deleteExplicitVersion)
                {
                    explicitVersionNode.Remove();
                    projectDocument.Save(projectPath);
                }
            }
        }
    }
}