using System.Diagnostics;
using System.Text;

namespace BuildTool.Publishing;

public sealed class ProcessResult
{
    public required int ExitCode { get; init; }
    public required string StandardOutput { get; init; }
    public required string StandardError { get; init; }
    public bool Success => ExitCode == 0;
}

public static class ProcessRunner
{
    /// <summary>
    /// Runs a command with output captured (for parsing results).
    /// </summary>
    public static ProcessResult RunCaptured(string fileName, string arguments, string? workingDirectory = null)
    {
        var stdout = new StringBuilder();
        var stderr = new StringBuilder();

        var psi = new ProcessStartInfo
        {
            FileName = fileName,
            Arguments = arguments,
            WorkingDirectory = workingDirectory ?? Directory.GetCurrentDirectory(),
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            UseShellExecute = false,
            CreateNoWindow = true
        };

        using var process = Process.Start(psi);
        if (process is null)
        {
            return new ProcessResult
            {
                ExitCode = -1,
                StandardOutput = "",
                StandardError = $"Failed to start process: {fileName}"
            };
        }

        process.OutputDataReceived += (_, e) =>
        {
            if (e.Data is not null)
            {
                stdout.AppendLine(e.Data);
            }
        };
        process.ErrorDataReceived += (_, e) =>
        {
            if (e.Data is not null)
            {
                stderr.AppendLine(e.Data);
            }
        };

        process.BeginOutputReadLine();
        process.BeginErrorReadLine();
        process.WaitForExit();

        return new ProcessResult
        {
            ExitCode = process.ExitCode,
            StandardOutput = stdout.ToString(),
            StandardError = stderr.ToString()
        };
    }

    /// <summary>
    /// Runs a command with output passed through to the console (for build commands in non-interactive mode).
    /// </summary>
    public static int RunPassthrough(string fileName, string arguments, string? workingDirectory = null)
    {
        var psi = new ProcessStartInfo
        {
            FileName = fileName,
            Arguments = arguments,
            WorkingDirectory = workingDirectory ?? Directory.GetCurrentDirectory(),
            UseShellExecute = false
        };

        using var process = Process.Start(psi);
        if (process is null)
        {
            return -1;
        }

        process.WaitForExit();
        return process.ExitCode;
    }
}