package backup

import (
	"context"
	"io"
	"time"
)

// Strategy defines the backup/restore strategy interface
type Strategy interface {
	// Execute performs a backup
	Execute(ctx context.Context, serviceName, directory string) error

	ListBackups(ctx context.Context, serviceName string) ([]BackupInfo, error)

	GetStorageUsage(ctx context.Context, serviceName string) (*StorageUsageInfo, error)

	RestoreBackup(ctx context.Context, backupID string, serviceName string) error

	DownloadBackup(ctx context.Context, backupID, serviceName string) (io.ReadCloser, error)

	GetBackupInfo(context.Context, string, string) (*BackupInfo, error)
}

// BackupInfo contains information about a single backup
type BackupInfo struct {
	ID           string    // Unique identifier for the backup
	CreationTime time.Time // When the backup was created
	Size         int64     // Size in bytes
	Source       string    // Original source path
	Type         string    // Type of backup (e.g., "kopia", "restic")
	RetentionTag string    // Retention policy applied (e.g., "latest", "daily", "weekly")
}

// StorageUsageInfo contains information about backup storage usage
type StorageUsageInfo struct {
	TotalBytes int64  // Total bytes stored
	Provider   string // Storage provider (e.g., "local", "b2", "s3")
	ProviderID string // Provider-specific ID (bucket name, path, etc.)
}

// Retention represents retention policy for backups
type Retention struct {
	KeepLatest  int
	KeepHourly  int
	KeepDaily   int
	KeepWeekly  int
	KeepMonthly int
	KeepYearly  int
}

// Destination represents rsync destination
type Destination struct {
	Host   string
	Path   string
	SSHKey string
}