package commands

import (
	"os"
	"os/signal"
	"syscall"

	"tercul/cmd/cli/internal/bootstrap"
	"tercul/internal/jobs/sync"
	"tercul/internal/platform/config"
	"tercul/internal/platform/db"
	app_log "tercul/internal/platform/log"

	"github.com/hibiken/asynq"
	"github.com/spf13/cobra"
)

// NewWorkerCommand creates a new Cobra command for running background workers
func NewWorkerCommand() *cobra.Command {
	cmd := &cobra.Command{
		Use:   "worker",
		Short: "Start the Tercul background worker",
		Long: `Start the Tercul background worker to process async jobs including:
- Sync jobs (Weaviate indexing, etc.)
- Linguistic analysis jobs
- Trending calculation jobs`,
		RunE: func(cmd *cobra.Command, args []string) error {
			// Load configuration
			cfg, err := config.LoadConfig()
			if err != nil {
				return err
			}

			// Initialize logger
			app_log.Init("tercul-worker", cfg.Environment)
			app_log.Info("Starting Tercul worker...")

			// Initialize database connection
			database, err := db.InitDB(cfg, nil) // No metrics needed for the worker
			if err != nil {
				app_log.Fatal(err, "Failed to initialize database")
			}
			defer func() {
				if err := db.Close(database); err != nil {
					app_log.Error(err, "Error closing database")
				}
			}()

			// Initialize Weaviate client
			weaviateClient, err := bootstrap.NewWeaviateClient(cfg)
			if err != nil {
				app_log.Fatal(err, "Failed to create weaviate client")
			}

			// Initialize Asynq client and server
			redisConnection := asynq.RedisClientOpt{Addr: cfg.RedisAddr}
			asynqClient := asynq.NewClient(redisConnection)
			defer func() {
				if err := asynqClient.Close(); err != nil {
					app_log.Error(err, "Error closing asynq client")
				}
			}()

			srv := asynq.NewServer(
				redisConnection,
				asynq.Config{
					Concurrency: 10, // Example concurrency
					Queues: map[string]int{
						"critical": 6,
						"default":  3,
						"low":      1,
					},
				},
			)

			// Create SyncJob with all dependencies
			syncJob := sync.NewSyncJob(database, asynqClient, cfg, weaviateClient)

			// Create a new ServeMux for routing jobs
			mux := asynq.NewServeMux()

			// Register all job handlers
			sync.RegisterQueueHandlers(mux, syncJob)
			// Placeholder for other job handlers that might be added in the future
			// linguistics.RegisterLinguisticHandlers(mux, linguisticJob)
			// trending.RegisterTrendingHandlers(mux, analyticsService)

			// Start the server in a goroutine
			go func() {
				if err := srv.Run(mux); err != nil {
					app_log.Fatal(err, "Could not run asynq server")
				}
			}()

			app_log.Info("Worker started successfully.")

			// Wait for interrupt signal to gracefully shutdown the server
			quit := make(chan os.Signal, 1)
			signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
			<-quit

			app_log.Info("Shutting down worker...")
			srv.Shutdown()
			app_log.Info("Worker shut down successfully.")
			return nil
		},
	}

	return cmd
}