package cli

import (
	"context"
	"fmt"
	"net/http"
	"os"
	"os/signal"
	"path/filepath"
	"syscall"
	"time"

	"github.com/thepeterstone/claudomator/internal/api"
	"github.com/thepeterstone/claudomator/internal/executor"
	"github.com/thepeterstone/claudomator/internal/notify"
	"github.com/thepeterstone/claudomator/internal/storage"
	"github.com/thepeterstone/claudomator/internal/version"
	"github.com/spf13/cobra"
)

func newServeCmd() *cobra.Command {
	var addr string
	var workspaceRoot string

	cmd := &cobra.Command{
		Use:   "serve",
		Short: "Start the Claudomator API server",
		RunE: func(cmd *cobra.Command, args []string) error {
			if cmd.Flags().Changed("workspace-root") {
				cfg.WorkspaceRoot = workspaceRoot
			}
			return serve(addr)
		},
	}

	cmd.Flags().StringVar(&addr, "addr", ":8484", "listen address")
	cmd.Flags().StringVar(&workspaceRoot, "workspace-root", "/workspace", "root directory for listing workspaces")
	cmd.Flags().StringVar(&cfg.ClaudeImage, "claude-image", cfg.ClaudeImage, "docker image for claude agents")
	cmd.Flags().StringVar(&cfg.GeminiImage, "gemini-image", cfg.GeminiImage, "docker image for gemini agents")

	return cmd
}

func serve(addr string) error {
	if err := cfg.EnsureDirs(); err != nil {
		return fmt.Errorf("creating dirs: %w", err)
	}

	store, err := storage.Open(cfg.DBPath)
	if err != nil {
		return fmt.Errorf("opening db: %w", err)
	}
	defer store.Close()

	// Load VAPID keys from DB; generate and persist if missing.
	if cfg.VAPIDPublicKey == "" || cfg.VAPIDPrivateKey == "" {
		pub, _ := store.GetSetting("vapid_public_key")
		priv, _ := store.GetSetting("vapid_private_key")
		if pub == "" || priv == "" || !notify.ValidateVAPIDPublicKey(pub) {
			pub, priv, err = notify.GenerateVAPIDKeys()
			if err != nil {
				return fmt.Errorf("generating VAPID keys: %w", err)
			}
			_ = store.SetSetting("vapid_public_key", pub)
			_ = store.SetSetting("vapid_private_key", priv)
		}
		cfg.VAPIDPublicKey = pub
		cfg.VAPIDPrivateKey = priv
	}

	logger := newLogger(verbose)

	apiURL := "http://localhost" + addr
	if len(addr) > 0 && addr[0] != ':' {
		apiURL = "http://" + addr
	}

	// Use configured credentials dir; sync-credentials keeps this populated.
	claudeConfigDir := cfg.ClaudeConfigDir

	repoDir, _ := os.Getwd()
	runners := map[string]executor.Runner{
		// ContainerRunner: binaries are resolved via PATH inside the container image,
		// so ClaudeBinary/GeminiBinary are left empty (host paths would not exist inside).
		"claude": &executor.ContainerRunner{
			Image:             cfg.ClaudeImage,
			Logger:            logger,
			LogDir:            cfg.LogDir,
			APIURL:            apiURL,
			DropsDir:          cfg.DropsDir,
			SSHAuthSock:       cfg.SSHAuthSock,
			ClaudeConfigDir:   claudeConfigDir,
			CredentialSyncCmd: filepath.Join(repoDir, "scripts", "sync-credentials"),
		},
		"gemini": &executor.ContainerRunner{
			Image:             cfg.GeminiImage,
			Logger:            logger,
			LogDir:            cfg.LogDir,
			APIURL:            apiURL,
			DropsDir:          cfg.DropsDir,
			SSHAuthSock:       cfg.SSHAuthSock,
			ClaudeConfigDir:   claudeConfigDir,
			CredentialSyncCmd: filepath.Join(repoDir, "scripts", "sync-credentials"),
		},
		"container": &executor.ContainerRunner{
			Image:             "claudomator-agent:latest",
			Logger:            logger,
			LogDir:            cfg.LogDir,
			APIURL:            apiURL,
			DropsDir:          cfg.DropsDir,
			SSHAuthSock:       cfg.SSHAuthSock,
			ClaudeConfigDir:   claudeConfigDir,
			CredentialSyncCmd: filepath.Join(repoDir, "scripts", "sync-credentials"),
		},
	}

	pool := executor.NewPool(cfg.MaxConcurrent, runners, store, logger)
	if cfg.GeminiBinaryPath != "" {
		pool.Classifier = &executor.Classifier{GeminiBinaryPath: cfg.GeminiBinaryPath}
	}
	pool.RecoverStaleRunning(context.Background())
	pool.RecoverStaleQueued(context.Background())
	pool.RecoverStaleBlocked()

	srv := api.NewServer(store, pool, logger, cfg.ClaudeBinaryPath, cfg.GeminiBinaryPath)

	// Configure notifiers: combine webhook (if set) with web push.
	notifiers := []notify.Notifier{}
	if cfg.WebhookURL != "" {
		notifiers = append(notifiers, notify.NewWebhookNotifier(cfg.WebhookURL, logger))
	}
	webPushNotifier := &notify.WebPushNotifier{
		Store:           store,
		VAPIDPublicKey:  cfg.VAPIDPublicKey,
		VAPIDPrivateKey: cfg.VAPIDPrivateKey,
		VAPIDEmail:      cfg.VAPIDEmail,
		Logger:          logger,
	}
	notifiers = append(notifiers, webPushNotifier)
	srv.SetNotifier(notify.NewMultiNotifier(logger, notifiers...))

	srv.SetVAPIDConfig(cfg.VAPIDPublicKey, cfg.VAPIDPrivateKey, cfg.VAPIDEmail)
	srv.SetPushStore(store)
	srv.SetDropsDir(cfg.DropsDir)

	if cfg.WorkspaceRoot != "" {
		srv.SetWorkspaceRoot(cfg.WorkspaceRoot)
	}
	srv.SetGitHubWebhookConfig(cfg.WebhookSecret, cfg.Projects)

	// Register scripts.
	wd, _ := os.Getwd()
	srv.SetScripts(api.ScriptRegistry{
		"start-next-task": filepath.Join(wd, "scripts", "start-next-task"),
		"deploy":          filepath.Join(wd, "scripts", "deploy"),
	})

	srv.StartHub()

	httpSrv := &http.Server{
		Addr:    addr,
		Handler: srv.Handler(),
	}

	// Graceful shutdown.
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	sigCh := make(chan os.Signal, 1)
	signal.Notify(sigCh, os.Interrupt, syscall.SIGTERM)
	go func() {
		<-sigCh
		logger.Info("shutting down server...")
		shutdownCtx, shutdownCancel := context.WithTimeout(ctx, 5*time.Second)
		defer shutdownCancel()
		if err := httpSrv.Shutdown(shutdownCtx); err != nil {
			logger.Warn("shutdown error", "err", err)
		}
	}()

	fmt.Printf("Claudomator %s listening on %s\n", version.Version(), addr)
	if err := httpSrv.ListenAndServe(); err != http.ErrServerClosed {
		return err
	}
	return nil
}