package backup

import (
	"fmt"
	"log"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"time"
)

// BackupFactory creates backup strategies and managers
type BackupFactory struct {
	Config     *Configuration
	ConfigPath string
}

// NewBackupFactory creates a new backup factory
func NewBackupFactory(configPath string) (*BackupFactory, error) {
	// Load configuration
	config, err := LoadConfig(configPath)
	if err != nil {
		return nil, fmt.Errorf("could not load config: %w", err)
	}
	return &BackupFactory{
		Config:     config,
		ConfigPath: configPath,
	}, nil
}

// CreateKopiaStrategy creates a new Kopia backup strategy with specific retention settings and provider
func (f *BackupFactory) CreateKopiaStrategy(retention Retention, provider KopiaProvider) *KopiaStrategy {
	// Create temp directory for Kopia configs if it doesn't exist
	tmpConfigDir := filepath.Join(os.TempDir(), "kopia_configs")
	if err := os.MkdirAll(tmpConfigDir, 0755); err != nil {
		log.Printf("Warning: failed to create temp config directory: %v", err)
		// Fall back to default config path
		tmpConfigDir = os.TempDir()
	}

	// Generate a unique config file path for this instance
	configPath := filepath.Join(tmpConfigDir, fmt.Sprintf("kopia_%s_%d.config",
		provider.GetProviderType(), time.Now().UnixNano()))

	// Need to update this line to pass configPath
	return NewKopiaStrategy(retention, provider, configPath)
}

// CreateKopiaProvider creates the appropriate Kopia provider based on config
func (f *BackupFactory) CreateKopiaProvider(strategyConfig StrategyConfig) (KopiaProvider, error) {
	switch strategyConfig.Provider {
	case "b2_backblaze":
		return NewKopiaB2Provider(), nil
	case "local":
		// Extract options for local path if specified
		basePath := ""
		if strategyConfig.Options != "" {
			basePath = strategyConfig.Options
		} else {
			// Default to ~/.backea/repos if not specified
			basePath = filepath.Join(os.Getenv("HOME"), ".backea", "repos")
		}
		return NewKopiaLocalProvider(basePath), nil
	case "sftp":
		// Parse options for SFTP - expected format: "user@host:/path/to/backups"
		host := strategyConfig.Destination.Host
		path := strategyConfig.Destination.Path
		sshKey := strategyConfig.Destination.SSHKey

		if host == "" {
			return nil, fmt.Errorf("SFTP provider requires host in destination config")
		}
		if path == "" {
			return nil, fmt.Errorf("SFTP provider requires path in destination config")
		}

		// Default SSH key if not specified
		if sshKey == "" {
			sshKey = filepath.Join(os.Getenv("HOME"), ".ssh", "id_rsa")
		}

		// Extract username from host if in format user@host
		username := "root" // default
		if hostParts := strings.Split(host, "@"); len(hostParts) > 1 {
			username = hostParts[0]
			host = hostParts[1]
		}

		return NewKopiaSFTPProvider(host, path, username, sshKey), nil
	default:
		return nil, fmt.Errorf("unsupported Kopia provider: %s", strategyConfig.Provider)
	}
}

// CreateBackupStrategyForService creates a backup strategy for the specified service within a group
func (f *BackupFactory) CreateBackupStrategyForService(groupName string, serviceIndex string) (Strategy, error) {
	// Find service group
	serviceGroup, exists := f.Config.Services[groupName]
	if !exists {
		return nil, fmt.Errorf("service group not found: %s", groupName)
	}

	// Find specific backup config within the group
	backupConfig, exists := serviceGroup.BackupConfigs[serviceIndex]
	if !exists {
		return nil, fmt.Errorf("backup config not found: %s.%s", groupName, serviceIndex)
	}

	// Create appropriate strategy based on type
	strategyConfig := backupConfig.BackupStrategy

	// Extract retention settings once
	retention := Retention{
		KeepLatest:  strategyConfig.Retention.KeepLatest,
		KeepHourly:  strategyConfig.Retention.KeepHourly,
		KeepDaily:   strategyConfig.Retention.KeepDaily,
		KeepWeekly:  strategyConfig.Retention.KeepWeekly,
		KeepMonthly: strategyConfig.Retention.KeepMonthly,
		KeepYearly:  strategyConfig.Retention.KeepYearly,
	}

	switch strategyConfig.Type {
	case "kopia":
		// Create appropriate provider based on configuration
		provider, err := f.CreateKopiaProvider(strategyConfig)
		if err != nil {
			return nil, fmt.Errorf("failed to create kopia provider: %w", err)
		}
		return f.CreateKopiaStrategy(retention, provider), nil
	case "rsync":
		// Uncomment when rsync implementation is ready
		// return NewRsyncStrategy(
		//   strategyConfig.Options,
		//   Destination{
		//     Host: strategyConfig.Destination.Host,
		//     Path: strategyConfig.Destination.Path,
		//     SSHKey: strategyConfig.Destination.SSHKey,
		//   },
		// ), nil
		fallthrough
	default:
		// Default to local kopia if type is unknown or rsync (temporarily)
		provider, _ := f.CreateKopiaProvider(StrategyConfig{Provider: "local"})
		return f.CreateKopiaStrategy(retention, provider), nil
	}
}

// ExecuteGroupHooks runs the hooks for a service group
func (f *BackupFactory) ExecuteGroupHooks(groupName string, isBeforeHook bool) error {
	serviceGroup, exists := f.Config.Services[groupName]
	if !exists {
		return fmt.Errorf("service group not found: %s", groupName)
	}

	var hook string
	if isBeforeHook {
		hook = serviceGroup.Hooks.BeforeHook
	} else {
		hook = serviceGroup.Hooks.AfterHook
	}

	if hook == "" {
		return nil
	}

	// Execute the hook
	cmd := exec.Command("sh", "-c", hook)
	output, err := cmd.CombinedOutput()

	if err != nil {
		return fmt.Errorf("hook execution failed: %w, output: %s", err, string(output))
	}

	log.Printf("Hook executed successfully: %s, output: %s", hook, string(output))
	return nil
}

// ReloadConfig refreshes the configuration from the config file
func (f *BackupFactory) ReloadConfig() error {
	config, err := LoadConfig(f.ConfigPath)
	if err != nil {
		return fmt.Errorf("could not reload config: %w", err)
	}
	f.Config = config
	return nil
}