// Package main implements the ML task worker
package main

import (
	"log"
	"os"
	"os/signal"
	"strings"
	"syscall"

	"github.com/jfraeys/fetch_ml/internal/auth"
	"github.com/jfraeys/fetch_ml/internal/config"
	"github.com/jfraeys/fetch_ml/internal/worker"
)

const (
	defaultConfigPath = "config-local.yaml"
)

func resolveWorkerConfigPath(flags *auth.Flags) string {
	if flags != nil {
		p := strings.TrimSpace(flags.ConfigFile)
		if p != "" {
			return p
		}
	}
	if _, err := os.Stat("/app/configs/worker.yaml"); err == nil {
		return "/app/configs/worker.yaml"
	}
	return defaultConfigPath
}

func main() {
	log.SetFlags(log.LstdFlags | log.Lshortfile)

	// Parse authentication flags
	authFlags := auth.ParseAuthFlags()
	if err := auth.ValidateFlags(authFlags); err != nil {
		log.Fatalf("Authentication flag error: %v", err)
	}

	// Get API key from various sources
	apiKey := auth.GetAPIKeyFromSources(authFlags)

	// Load configuration
	resolvedConfig, err := config.ResolveConfigPath(resolveWorkerConfigPath(authFlags))
	if err != nil {
		log.Fatalf("%v", err)
	}

	cfg, err := worker.LoadConfig(resolvedConfig)
	if err != nil {
		log.Fatalf("Failed to load config: %v", err)
	}

	// Validate authentication configuration
	if err := cfg.Auth.ValidateAuthConfig(); err != nil {
		log.Fatalf("Invalid authentication configuration: %v", err)
	}

	// Validate configuration
	if err := cfg.Validate(); err != nil {
		log.Fatalf("Invalid configuration: %v", err)
	}

	// Test authentication if enabled
	if cfg.Auth.Enabled && apiKey != "" {
		user, err := cfg.Auth.ValidateAPIKey(apiKey)
		if err != nil {
			log.Fatalf("Authentication failed: %v", err)
		}
		log.Printf("Worker authenticated as user: %s (admin: %v)", user.Name, user.Admin)
	} else if cfg.Auth.Enabled {
		log.Fatal("Authentication required but no API key provided")
	}

	wrk, err := worker.NewWorker(cfg, apiKey)
	if err != nil {
		log.Fatalf("Failed to create worker: %v", err)
	}

	sigChan := make(chan os.Signal, 1)
	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)

	go wrk.Start()

	sig := <-sigChan
	log.Printf("Received signal: %v", sig)

	// Use graceful shutdown
	if err := wrk.Shutdown(); err != nil {
		log.Printf("Graceful shutdown error: %v", err)
		wrk.Stop() // Fallback to force stop
	} else {
		log.Println("Worker shut down gracefully")
	}
}