using System.Diagnostics;
using HanaToolbox.Logging;
using HanaToolbox.Services.Interfaces;

namespace HanaToolbox.Services;

/// <summary>Runs external processes and captures stdout/stderr.</summary>
public sealed class ProcessRunner(AppLogger logger) : IProcessRunner
{
    public async Task<ProcessResult> RunAsync(
        string executable, string[] args,
        CancellationToken ct = default)
    {
        var psi = new ProcessStartInfo
        {
            FileName = executable,
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            UseShellExecute = false,
            CreateNoWindow = true,
        };
        foreach (var arg in args) psi.ArgumentList.Add(arg);

        logger.Info($"Exec: {executable} {string.Join(' ', args)}");

        using var process = new Process { StartInfo = psi };
        process.Start();

        var stdoutTask = process.StandardOutput.ReadToEndAsync(ct);
        var stderrTask = process.StandardError.ReadToEndAsync(ct);

        await process.WaitForExitAsync(ct);

        var stdout = await stdoutTask;
        var stderr = await stderrTask;

        logger.Info($"Exit code: {process.ExitCode}");
        if (!string.IsNullOrWhiteSpace(stderr))
            logger.Info($"Stderr: {stderr.Trim()}");

        return new ProcessResult(process.ExitCode, stdout.Trim(), stderr.Trim());
    }
}