namespace TeamCity.dotCover;

using System.Diagnostics;

// ReSharper disable once ClassNeverInstantiated.Global
internal class DotCoverToolProcess : IToolProcess
{
    private readonly IDotCoverInfo _dotCoverInfo;
    private readonly IFileSystem _fileSystem;
    private readonly ISettings _settings;

    public DotCoverToolProcess(
        IDotCoverInfo dotCoverInfo,
        IFileSystem fileSystem,
        ISettings settings)
    {
        _dotCoverInfo = dotCoverInfo;
        _fileSystem = fileSystem;
        _settings = settings;
    }

    public Process CreateProcess()
    {
        var toolPath = TryGetToolPath(_settings.ToolPath) ?? TryGetToolPath(_dotCoverInfo.ToolPath);
        return new Process
        {
            StartInfo = new ProcessStartInfo
            {
                UseShellExecute = false,
                RedirectStandardOutput = true,
                RedirectStandardError = true,
                FileName = toolPath,
                Arguments = _dotCoverInfo.CommandArgs
            }
        };
    }

    public void Dispose() { }

    private string? TryGetToolPath(string? path)
    {
        if (path == default)
        {
            return default;
        }

        if (!_fileSystem.FileExists(path))
        {
            throw new ToolException($"\"{path}\" was not found.");
        }

        return path;
    }
}