// 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.Collections.Generic;
using System.IO;
using Microsoft.Build.Construction;
using Microsoft.DotNet.Tools.Test.Utilities;
using Xunit;
using FluentAssertions;
using HelpActual = Microsoft.DotNet.Tools.Help;

namespace Microsoft.DotNet.Help.Tests
{
    public class GivenThatIWantToShowHelpForDotnetCommand : TestBase
    {
        private const string HelpText =
@"Usage: dotnet [runtime-options] [path-to-application]
Usage: dotnet [command] [arguments] [command-options]

path-to-application:
  The path to an application .dll file to execute.

SDK commands:
  new              Initialize .NET projects.
  restore          Restore dependencies specified in the .NET project.
  run              Compiles and immediately executes a .NET project.
  build            Builds a .NET project.
  publish          Publishes a .NET project for deployment (including the runtime).
  test             Runs unit tests using the test runner specified in the project.
  pack             Creates a NuGet package.
  migrate          Migrates a project.json based project to a msbuild based project.
  clean            Clean build output(s).
  sln              Modify solution (SLN) files.
  add              Add reference to the project.
  remove           Remove reference from the project.
  list             List reference in the project.
  nuget            Provides additional NuGet commands.
  msbuild          Runs Microsoft Build Engine (MSBuild).
  vstest           Runs Microsoft Test Execution Command Line Tool.
  -v|--version     Display .NET Core SDK version.
  -i|--info        Display .NET Core information.
  -d|--diagnostics Enable diagnostic output.

Common options:
  -v|--verbose          Enable verbose output
  -h|--help             Show help

Run 'dotnet COMMAND --help' for more information on a command.

runtime-options:
  --additionalprobingpath <path>    Path containing probing policy and assemblies to probe for.
  --depsfile <path>                 Path to <application>.deps.json file.
  --runtimeconfig <path>            Path to <application>.runtimeconfig.json file.
  --fx-version <version>            Version of the installed Shared Framework to use to run the application.
  --roll-forward-on-no-candidate-fx Roll forward on no candidate shared framework is enabled.
  --additional-deps <path>          Path to additonal deps.json file.";

        [Theory]
        [InlineData("--help")]
        [InlineData("-h")]
        [InlineData("-?")]
        [InlineData("/?")]
        public void WhenHelpOptionIsPassedToDotnetItPrintsUsage(string helpArg)
        {
            var cmd = new DotnetCommand()
                .ExecuteWithCapturedOutput($"{helpArg}");
            cmd.Should().Pass();
            cmd.StdOut.Should().ContainVisuallySameFragment(HelpText);
        }

        [Fact]
        public void WhenHelpCommandIsPassedToDotnetItPrintsUsage()
        {
            var cmd = new HelpCommand()
                .ExecuteWithCapturedOutput();
            cmd.Should().Pass();
            cmd.StdOut.Should().ContainVisuallySameFragment(HelpText);
        }

        [Fact]
        public void WhenInvalidCommandIsPassedToDotnetHelpItPrintsError()
        {
          var cmd = new DotnetCommand()
                .ExecuteWithCapturedOutput("help invalid");

          cmd.Should().Fail();
          cmd.StdErr.Should().ContainVisuallySameFragment($"Specified command 'invalid' is not a valid CLI command. Please specify a valid CLI commands. For more information, run dotnet help.");
          cmd.StdOut.Should().ContainVisuallySameFragment(HelpText);
        }

        [WindowsOnlyFact]
        public void WhenRunOnWindowsDotnetHelpCommandShouldContainProperProcessInformation()
        {
          var proc = HelpActual.HelpCommand.ConfigureProcess("https://aka.ms/dotnet-build");
          Assert.Equal("cmd", proc.StartInfo.FileName);
          Assert.Equal("/c start https://aka.ms/dotnet-build", proc.StartInfo.Arguments);
        }

        [LinuxOnlyFact]
        public void WhenRunOnLinuxDotnetHelpCommandShouldContainProperProcessInformation()
        {
          var proc = HelpActual.HelpCommand.ConfigureProcess("https://aka.ms/dotnet-build");
          Assert.Equal("xdg-open", proc.StartInfo.FileName);
          Assert.Equal("https://aka.ms/dotnet-build", proc.StartInfo.Arguments);

        }
        [MacOsOnlyFact]
        public void WhenRunOnMacOsDotnetHelpCommandShouldContainProperProcessInformation()
        {
          var proc = HelpActual.HelpCommand.ConfigureProcess("https://aka.ms/dotnet-build");
          Assert.Equal("open", proc.StartInfo.FileName);
          Assert.Equal("https://aka.ms/dotnet-build", proc.StartInfo.Arguments);
        }
    }
}