package main

import (
	"context"
	"log/slog"
	"os"
	"os/signal"
	"sync"
	"syscall"
	"time"
)

var hostname string

func init() {
	var err error
	hostname, err = os.Hostname()
	if err != nil {
		hostname = "unknown"
	}
}

func main() {
	cfg, err := LoadConfigV2()
	if err != nil {
		slog.Error("error loading configuration", "error", err)
		os.Exit(1)
	}
	slog.Info("TIXEL System Monitor started")

	var storage StorageInterface
	if cfg.LocalStorage.Enable {
		sqliteStorage, err := NewSQLiteStorage(cfg.LocalStorage.DBPath)
		if err != nil {
			slog.Error("failed to initialize SQLite storage", "error", err)
			os.Exit(1)
		}
		storage = sqliteStorage
		defer storage.Close()
		slog.Info("SQLite storage initialized", "path", cfg.LocalStorage.DBPath)
	} else {
		slog.Error("Local storage is disabled, but it's required for the new architecture")
		os.Exit(1)
	}

	var exportManager *ExportManager
	if cfg.Export.Enabled {
		exportConfig := ExportManagerConfig{
			BatchSize:           cfg.Export.BatchSize,
			ExportInterval:      cfg.Export.ExportInterval,
			RetryAttempts:       cfg.Export.RetryAttempts,
			RetryBackoff:        cfg.Export.RetryBackoff,
			HealthCheckInterval: cfg.Export.HealthCheckInterval,
		}

		exportManager = NewExportManager(storage, exportConfig)

		if cfg.Elasticsearch.Enabled {
			esExporter, err := NewElasticsearchExporterV2(cfg.Elasticsearch)
			if err != nil {
				slog.Error("failed to create Elasticsearch exporter", "error", err)
				os.Exit(1)
			}

			if err := esExporter.HealthCheck(context.Background()); err != nil {
				slog.Error("Elasticsearch health check failed", "error", err)
				os.Exit(1)
			}

			exportManager.RegisterExporter("elasticsearch", esExporter)
			slog.Info("Elasticsearch exporter registered")
		}

		// Add more exporters here in the future
		// exportManager.RegisterExporter("checkmk", checkmkExporter)
		// exportManager.RegisterExporter("grafana", grafanaExporter)
	}

	logChan := make(chan LogEntry, 1000)
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	var wg sync.WaitGroup

	wg.Add(1)
	go func() {
		defer wg.Done()
		processor := NewLogProcessor(storage)
		processor.Start(ctx, logChan)
	}()

	if exportManager != nil {
		wg.Add(1)
		go func() {
			defer wg.Done()
			exportManager.Start(ctx)
		}()
	}

	for _, service := range cfg.Services {
		if !service.Enabled {
			slog.Info("Service deactivated, skipping...", "service", service.Name)
			continue
		}

		wg.Add(1)
		go func(s ServiceConfig) {
			defer wg.Done()
			monitor := NewServiceMonitor(s)
			if err := monitor.Start(ctx, logChan); err != nil {
				slog.Error("error watching service", "service", s.Name, "error", err)
			}
		}(service)

		slog.Info("started watching Service-Log", "service", service.Name)
	}

	for _, tool := range cfg.Tools {
		if !tool.Enabled {
			slog.Info("Tool is deactivated, skipping...", "tool", tool.Name)
			continue
		}

		wg.Add(1)
		go func(t ToolConfig) {
			defer wg.Done()
			monitor := NewFileMonitor(t)
			if err := monitor.Start(ctx, logChan); err != nil {
				slog.Error("error watching", "tool", t.Name, "error", err)
			}
		}(tool)

		slog.Info("started watching logs", "tool", tool.Name, "file", tool.LogFile)
	}

	if cfg.SystemMetrics.Enabled {
		wg.Add(1)
		go func() {
			defer wg.Done()
			collector := NewSystemMetricsCollector(cfg.SystemMetrics, cfg.PollIntervalSeconds)
			collector.StartV2(ctx, storage, logChan)
		}()
		slog.Info("Started collecting System-Metrics")
	}

	if cfg.WebService.Enabled {
		wg.Add(1)
		go func() {
			defer wg.Done()
			webService := NewWebServiceV2(cfg, storage)
			if err := webService.Start(ctx); err != nil {
				slog.Error("web service error", "error", err)
			}
		}()
		slog.Info("Web service started", "host", cfg.WebService.Host, "port", cfg.WebService.Port)
	}

	sigCh := make(chan os.Signal, 1)
	signal.Notify(sigCh, os.Interrupt, syscall.SIGTERM)

	<-sigCh
	slog.Info("Shutdown-Signal received, stopping threads...")

	cancel()
	close(logChan)

	done := make(chan struct{})
	go func() {
		wg.Wait()
		close(done)
	}()

	select {
	case <-done:
		slog.Info("All threads closed")
	case <-time.After(10 * time.Second):
		slog.Info("Shutdown-Timeout reached, force quitting")
	}

	slog.Info("Program stopped")
}