//go:build !ios && !android
package cmd

import (
	"context"
	"fmt"
	"os"
	"path/filepath"
	"runtime"

	"github.com/kardianos/service"
	"github.com/spf13/cobra"
)

// Common service command setup
func setupServiceCommand(cmd *cobra.Command) error {
	SetFlagsFromEnvVars(rootCmd)
	SetFlagsFromEnvVars(serviceCmd)
	cmd.SetOut(cmd.OutOrStdout())
	return handleRebrand(cmd)
}

// Build service arguments for install/reconfigure
func buildServiceArguments() []string {
	args := []string{
		"service",
		"run",
		"--config",
		configPath,
		"--log-level",
		logLevel,
		"--daemon-addr",
		daemonAddr,
	}

	if managementURL != "" {
		args = append(args, "--management-url", managementURL)
	}

	if logFile != "" {
		args = append(args, "--log-file", logFile)
	}

	return args
}

// Configure platform-specific service settings
func configurePlatformSpecificSettings(svcConfig *service.Config) error {
	if runtime.GOOS == "linux" {
		// Respected only by systemd systems
		svcConfig.Dependencies = []string{"After=network.target syslog.target"}

		if logFile != "console" {
			setStdLogPath := true
			dir := filepath.Dir(logFile)

			if _, err := os.Stat(dir); err != nil {
				if err = os.MkdirAll(dir, 0750); err != nil {
					setStdLogPath = false
				}
			}

			if setStdLogPath {
				svcConfig.Option["LogOutput"] = true
				svcConfig.Option["LogDirectory"] = dir
			}
		}
	}

	if runtime.GOOS == "windows" {
		svcConfig.Option["OnFailure"] = "restart"
	}

	return nil
}

// Create fully configured service config for install/reconfigure
func createServiceConfigForInstall() (*service.Config, error) {
	svcConfig, err := newSVCConfig()
	if err != nil {
		return nil, fmt.Errorf("create service config: %w", err)
	}

	svcConfig.Arguments = buildServiceArguments()
	if err = configurePlatformSpecificSettings(svcConfig); err != nil {
		return nil, fmt.Errorf("configure platform-specific settings: %w", err)
	}

	return svcConfig, nil
}

var installCmd = &cobra.Command{
	Use:   "install",
	Short: "installs Netbird service",
	RunE: func(cmd *cobra.Command, args []string) error {
		if err := setupServiceCommand(cmd); err != nil {
			return err
		}

		svcConfig, err := createServiceConfigForInstall()
		if err != nil {
			return err
		}

		ctx, cancel := context.WithCancel(cmd.Context())
		defer cancel()

		s, err := newSVC(newProgram(ctx, cancel), svcConfig)
		if err != nil {
			return err
		}

		if err := s.Install(); err != nil {
			return fmt.Errorf("install service: %w", err)
		}

		cmd.Println("Netbird service has been installed")
		return nil
	},
}

var uninstallCmd = &cobra.Command{
	Use:   "uninstall",
	Short: "uninstalls Netbird service from system",
	RunE: func(cmd *cobra.Command, args []string) error {
		if err := setupServiceCommand(cmd); err != nil {
			return err
		}

		cfg, err := newSVCConfig()
		if err != nil {
			return fmt.Errorf("create service config: %w", err)
		}

		ctx, cancel := context.WithCancel(cmd.Context())
		defer cancel()

		s, err := newSVC(newProgram(ctx, cancel), cfg)
		if err != nil {
			return err
		}

		if err := s.Uninstall(); err != nil {
			return fmt.Errorf("uninstall service: %w", err)
		}

		cmd.Println("Netbird service has been uninstalled")
		return nil
	},
}

var reconfigureCmd = &cobra.Command{
	Use:   "reconfigure",
	Short: "reconfigures Netbird service with new settings",
	Long: `Reconfigures the Netbird service with new settings without manual uninstall/install.
This command will temporarily stop the service, update its configuration, and restart it if it was running.`,
	RunE: func(cmd *cobra.Command, args []string) error {
		if err := setupServiceCommand(cmd); err != nil {
			return err
		}

		wasRunning, err := isServiceRunning()
		if err != nil {
			return fmt.Errorf("check service status: %w", err)
		}

		svcConfig, err := createServiceConfigForInstall()
		if err != nil {
			return err
		}

		ctx, cancel := context.WithCancel(cmd.Context())
		defer cancel()

		s, err := newSVC(newProgram(ctx, cancel), svcConfig)
		if err != nil {
			return fmt.Errorf("create service: %w", err)
		}

		if wasRunning {
			cmd.Println("Stopping Netbird service...")
			if err := s.Stop(); err != nil {
				cmd.Printf("Warning: failed to stop service: %v\n", err)
			}
		}

		cmd.Println("Removing existing service configuration...")
		if err := s.Uninstall(); err != nil {
			return fmt.Errorf("uninstall existing service: %w", err)
		}

		cmd.Println("Installing service with new configuration...")
		if err := s.Install(); err != nil {
			return fmt.Errorf("install service with new config: %w", err)
		}

		if wasRunning {
			cmd.Println("Starting Netbird service...")
			if err := s.Start(); err != nil {
				return fmt.Errorf("start service after reconfigure: %w", err)
			}
			cmd.Println("Netbird service has been reconfigured and started")
		} else {
			cmd.Println("Netbird service has been reconfigured")
		}

		return nil
	},
}

func isServiceRunning() (bool, error) {
	cfg, err := newSVCConfig()
	if err != nil {
		return false, err
	}

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

	s, err := newSVC(newProgram(ctx, cancel), cfg)
	if err != nil {
		return false, err
	}

	status, err := s.Status()
	if err != nil {
		return false, nil
	}

	return status == service.StatusRunning, nil
}