// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using Aspire.Cli.Backchannel;
using Aspire.Cli.Commands;
using Aspire.Cli.Tests.TestServices;
using Aspire.Cli.Tests.Utils;
using Aspire.Cli.Utils;
using Microsoft.Extensions.DependencyInjection;
using Xunit;
 
namespace Aspire.Cli.Tests.Commands;
 
public class RunCommandTests(ITestOutputHelper outputHelper)
{
    [Fact]
    public async Task RunCommandWithHelpArgumentReturnsZero()
    {
        var services = CliTestHelper.CreateServiceCollection(outputHelper);
        var provider = services.BuildServiceProvider();
 
        var command = provider.GetRequiredService<RootCommand>();
        var result = command.Parse("run --help");
 
        var exitCode = await result.InvokeAsync().WaitAsync(CliTestConstants.DefaultTimeout);
        Assert.Equal(0, exitCode);
    }
 
    [Fact]
    public async Task RunCommand_WhenNoProjectFileFound_ReturnsNonZeroExitCode()
    {
        var services = CliTestHelper.CreateServiceCollection(outputHelper, options =>
        {
            options.ProjectLocatorFactory = _ => new NoProjectFileProjectLocator();
        });
        var provider = services.BuildServiceProvider();
 
        var command = provider.GetRequiredService<RootCommand>();
        var result = command.Parse("run");
 
        var exitCode = await result.InvokeAsync().WaitAsync(CliTestConstants.DefaultTimeout);
        Assert.Equal(ExitCodeConstants.FailedToFindProject, exitCode);
    }
 
    [Fact]
    public async Task RunCommand_WhenMultipleProjectFilesFound_ReturnsNonZeroExitCode()
    {
        var services = CliTestHelper.CreateServiceCollection(outputHelper, options =>
        {
            options.ProjectLocatorFactory = _ => new MultipleProjectFilesProjectLocator();
        });
        var provider = services.BuildServiceProvider();
 
        var command = provider.GetRequiredService<RootCommand>();
        var result = command.Parse("run");
 
        var exitCode = await result.InvokeAsync().WaitAsync(CliTestConstants.DefaultTimeout);
        Assert.Equal(ExitCodeConstants.FailedToFindProject, exitCode);
    }
 
    [Fact]
    public async Task RunCommand_WhenProjectFileDoesNotExist_ReturnsNonZeroExitCode()
    {
        var services = CliTestHelper.CreateServiceCollection(outputHelper, options =>
        {
            options.ProjectLocatorFactory = _ => new ProjectFileDoesNotExistLocator();
        });
        var provider = services.BuildServiceProvider();
 
        var command = provider.GetRequiredService<RootCommand>();
        var result = command.Parse("run --project /tmp/doesnotexist.csproj");
 
        var exitCode = await result.InvokeAsync().WaitAsync(CliTestConstants.DefaultTimeout);
 
        Assert.Equal(ExitCodeConstants.FailedToFindProject, exitCode);
    }
 
    private sealed class ProjectFileDoesNotExistLocator : Aspire.Cli.Projects.IProjectLocator
    {
        public FileInfo? UseOrFindAppHostProjectFile(FileInfo? projectFile)
        {
            throw new Aspire.Cli.Projects.ProjectLocatorException("Project file does not exist.");
        }
    }
 
    [Fact]
    public async Task RunCommand_WhenCertificateServiceThrows_ReturnsNonZeroExitCode()
    {
        var services = CliTestHelper.CreateServiceCollection(outputHelper, options =>
        {
            options.CertificateServiceFactory = _ => new ThrowingCertificateService();
        });
        var provider = services.BuildServiceProvider();
 
        var command = provider.GetRequiredService<RootCommand>();
        var result = command.Parse("run");
 
        var exitCode = await result.InvokeAsync().WaitAsync(CliTestConstants.DefaultTimeout);
        Assert.NotEqual(0, exitCode);
    }
 
    private sealed class ThrowingCertificateService : Aspire.Cli.Certificates.ICertificateService
    {
        public Task EnsureCertificatesTrustedAsync(IDotNetCliRunner runner, CancellationToken cancellationToken)
        {
            throw new NotImplementedException();
        }
    }
 
    private sealed class NoProjectFileProjectLocator : Aspire.Cli.Projects.IProjectLocator
    {
        public FileInfo? UseOrFindAppHostProjectFile(FileInfo? projectFile)
        {
            throw new Aspire.Cli.Projects.ProjectLocatorException("No project file found.");
        }
    }
 
    private sealed class MultipleProjectFilesProjectLocator : Aspire.Cli.Projects.IProjectLocator
    {
        public FileInfo? UseOrFindAppHostProjectFile(FileInfo? projectFile)
        {
            throw new Aspire.Cli.Projects.ProjectLocatorException("Multiple project files found.");
        }
    }
 
    [Fact]
    public async Task RunCommand_CompletesSuccessfully()
    {
        var getResourceStatesAsyncCalled = new TaskCompletionSource();
 
        var backchannelFactory = (IServiceProvider sp) => {
            var backchannel = new TestAppHostBackchannel();
 
            backchannel.GetResourceStatesAsyncCalled = getResourceStatesAsyncCalled;
 
            return backchannel;
        };
 
        var runnerFactory = (IServiceProvider sp) => {
            var runner = new TestDotNetCliRunner();
 
            // Fake the certificate check to always succeed
            runner.CheckHttpCertificateAsyncCallback = (ct) => 0;
 
            // Fake the build command to always succeed.
            runner.BuildAsyncCallback = (projectFile, ct) => 0;
 
            // Fake apphost information to return a compatable app host.
            runner.GetAppHostInformationAsyncCallback = (projectFile, ct) => (0, true, VersionHelper.GetDefaultTemplateVersion());
 
            // public Task<int> RunAsync(FileInfo projectFile, bool watch, bool noBuild, string[] args, IDictionary<string, string>? env, TaskCompletionSource<AppHostBackchannel>? backchannelCompletionSource, CancellationToken cancellationToken)
            runner.RunAsyncCallback = async (projectFile, watch, noBuild, args, env, backchannelCompletionSource, ct) =>
            {
                // Make a backchannel and return it, but don't return from the run call until the backchannel 
                var backchannel = sp.GetRequiredService<IAppHostBackchannel>();
                backchannelCompletionSource!.SetResult(backchannel);
 
                // Just simulate the process running until the user cancels.
                await Task.Delay(Timeout.InfiniteTimeSpan, ct);
 
                return 0;
            };
 
            return runner;
        };
 
        var projectLocatorFactory = (IServiceProvider sp) => new TestProjectLocator();
        
        var services = CliTestHelper.CreateServiceCollection(outputHelper, options =>
        {
            options.ProjectLocatorFactory = projectLocatorFactory;
            options.AppHostBackchannelFactory = backchannelFactory;
            options.DotNetCliRunnerFactory = runnerFactory;
        });
 
        var provider = services.BuildServiceProvider();
        var command = provider.GetRequiredService<RootCommand>();
        var result = command.Parse("run");
 
        using var cts = new CancellationTokenSource();
        var pendingRun = result.InvokeAsync(cts.Token);
 
        await getResourceStatesAsyncCalled.Task.WaitAsync(CliTestConstants.DefaultTimeout);
 
        // Simulate CTRL-C.
        cts.Cancel();
 
        var exitCode = await pendingRun.WaitAsync(CliTestConstants.DefaultTimeout);
        Assert.Equal(ExitCodeConstants.Success, exitCode);
    }
}