using OversightService.Services;

namespace OversightService
{
    public class Worker : BackgroundService
    {
        private readonly ILogger<Worker> _logger;
        private OsqueryTaskScheduler? _taskScheduler;
        private AppConfig? _config;

        public Worker(ILogger<Worker> logger)
        {
            _logger = logger;
        }

        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            _logger.LogInformation("OversightService starting...");

            try
            {
                // Load configuration
                _config = LoadConfig();
                _logger.LogInformation("Configuration loaded successfully.");

                // Initialize osquery task scheduler
                InitializeTaskScheduler();
                _logger.LogInformation("Task scheduler initialized successfully.");
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Failed to initialize OversightService");
                throw;
            }

            // Keep service running
            while (!stoppingToken.IsCancellationRequested)
            {
                await Task.Delay(TimeSpan.FromMinutes(1), stoppingToken);
            }

            // Cleanup on shutdown
            _logger.LogInformation("OversightService stopping...");
            _taskScheduler?.Stop();
        }

        private AppConfig LoadConfig()
        {
            var configPath = Path.Combine(AppContext.BaseDirectory, "config.json");

            if (!File.Exists(configPath))
            {
                throw new FileNotFoundException($"Config file not found at {configPath}");
            }

            var json = File.ReadAllText(configPath);
            var config = Newtonsoft.Json.JsonConvert.DeserializeObject<AppConfig>(json);

            if (config == null)
            {
                throw new InvalidOperationException("Failed to deserialize config.json");
            }

            return config;
        }

        private void InitializeTaskScheduler()
        {
            if (_config == null)
            {
                throw new InvalidOperationException("Config must be loaded before initializing scheduler");
            }

            _taskScheduler = new OsqueryTaskScheduler();

            // Register patch compliance task if enabled
            if (_config.PatchCompliance.Enabled)
            {
                var apiClient = new ApiClient(_config);
                var patchTask = new PatchComplianceTask(_config, apiClient);
                _taskScheduler.RegisterTask(patchTask);

                _logger.LogInformation("Patch compliance task registered (interval: {hours} hours)",
                    _config.PatchCompliance.CheckIntervalHours);
            }

            // Start the scheduler
            _taskScheduler.Start();
        }
    }
}