// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

#nullable disable

using Microsoft.DotNet.Cli.CommandFactory;
using Microsoft.Extensions.EnvironmentAbstractions;

namespace Microsoft.DotNet.Cli.BuildServer;

internal class RazorServer(
    RazorPidFile pidFile,
    ICommandFactory commandFactory = null,
    IFileSystem fileSystem = null) : IBuildServer
{
    private readonly ICommandFactory _commandFactory = commandFactory ?? new DotNetCommandFactory(alwaysRunOutOfProc: true);
    private readonly IFileSystem _fileSystem = fileSystem ?? FileSystemWrapper.Default;

    public int ProcessId => PidFile.ProcessId;

    public string Name => CliStrings.RazorServer;

    public RazorPidFile PidFile { get; } = pidFile ?? throw new ArgumentNullException(nameof(pidFile));

    public void Shutdown()
    {
        if (!_fileSystem.File.Exists(PidFile.ServerPath.Value))
        {
            // The razor server path doesn't exist anymore so trying to shut it down would fail
            // Ensure the pid file is cleaned up so we don't try to shut it down again
            DeletePidFile();
            return;
        }

        var command = _commandFactory
            .Create(
                "exec",
                [
                    PidFile.ServerPath.Value,
                    "shutdown",
                    "-w",   // Wait for exit
                    "-p",   // Pipe name
                    PidFile.PipeName
                ])
            .CaptureStdOut()
            .CaptureStdErr();

        var result = command.Execute();
        if (result.ExitCode != 0)
        {
            throw new BuildServerException(
                string.Format(
                    CliStrings.ShutdownCommandFailed,
                    result.StdErr));
        }

        // After a successful shutdown, ensure the pid file is deleted
        // If the pid file was left behind due to a rude exit, this ensures we don't try to shut it down again
        DeletePidFile();
    }

    void DeletePidFile()
    {
        try
        {
            if (_fileSystem.File.Exists(PidFile.Path.Value))
            {
                _fileSystem.File.Delete(PidFile.Path.Value);
            }
        }
        catch (UnauthorizedAccessException)
        {
        }
        catch (IOException)
        {
        }
    }
}