namespace GhostImageManager.Services;

public class LogService
{
    private readonly IWebHostEnvironment _env;
    private readonly string _logsDir;

    public LogService(IWebHostEnvironment env)
    {
        _env = env;
        _logsDir = Path.Combine(env.ContentRootPath, "logs");
    }

    public List<string> GetLogFiles()
    {
        if (!Directory.Exists(_logsDir))
            return new List<string>();

        return Directory.GetFiles(_logsDir, "ghost-image-manager-*.log")
            .OrderByDescending(f => f)
            .ToList();
    }

    public string ReadLogFile(string fileName, int maxLines = 1000)
    {
        var filePath = Path.Combine(_logsDir, fileName);
        if (!File.Exists(filePath))
            return $"Log-Datei nicht gefunden: {fileName}";

        try
        {
            var lines = File.ReadAllLines(filePath);
            if (lines.Length <= maxLines)
                return string.Join(Environment.NewLine, lines);

            return string.Join(Environment.NewLine, lines.Skip(lines.Length - maxLines));
        }
        catch (Exception ex)
        {
            return $"Fehler beim Lesen der Log-Datei: {ex.Message}";
        }
    }

    public string ReadLatestLog(int maxLines = 1000)
    {
        var files = GetLogFiles();
        if (!files.Any())
            return "Keine Log-Dateien vorhanden.";

        return ReadLogFile(Path.GetFileName(files.First()), maxLines);
    }
}