vaultik/internal/vaultik/snapshot.go

package vaultik

import (
	"encoding/json"
	"fmt"
	"os"
	"path/filepath"
	"sort"
	"strings"
	"text/tabwriter"
	"time"

	"git.eeqj.de/sneak/vaultik/internal/database"
	"git.eeqj.de/sneak/vaultik/internal/log"
	"git.eeqj.de/sneak/vaultik/internal/snapshot"
	"github.com/dustin/go-humanize"
)

// SnapshotCreateOptions contains options for the snapshot create command
type SnapshotCreateOptions struct {
	Daemon bool
	Cron   bool
	Prune  bool
}

// CreateSnapshot executes the snapshot creation operation
func (v *Vaultik) CreateSnapshot(opts *SnapshotCreateOptions) error {
	snapshotStartTime := time.Now()

	log.Info("Starting snapshot creation",
		"version", v.Globals.Version,
		"commit", v.Globals.Commit,
		"index_path", v.Config.IndexPath,
	)

	// Clean up incomplete snapshots FIRST, before any scanning
	// This is critical for data safety - see CleanupIncompleteSnapshots for details
	hostname := v.Config.Hostname
	if hostname == "" {
		hostname, _ = os.Hostname()
	}

	// CRITICAL: This MUST succeed. If we fail to clean up incomplete snapshots,
	// the deduplication logic will think files from the incomplete snapshot were
	// already backed up and skip them, resulting in data loss.
	if err := v.SnapshotManager.CleanupIncompleteSnapshots(v.ctx, hostname); err != nil {
		return fmt.Errorf("cleanup incomplete snapshots: %w", err)
	}

	if opts.Daemon {
		log.Info("Running in daemon mode")
		// TODO: Implement daemon mode with inotify
		return fmt.Errorf("daemon mode not yet implemented")
	}

	// Resolve source directories to absolute paths
	resolvedDirs := make([]string, 0, len(v.Config.SourceDirs))
	for _, dir := range v.Config.SourceDirs {
		absPath, err := filepath.Abs(dir)
		if err != nil {
			return fmt.Errorf("failed to resolve absolute path for %s: %w", dir, err)
		}

		// Resolve symlinks
		resolvedPath, err := filepath.EvalSymlinks(absPath)
		if err != nil {
			// If the path doesn't exist yet, use the absolute path
			if os.IsNotExist(err) {
				resolvedPath = absPath
			} else {
				return fmt.Errorf("failed to resolve symlinks for %s: %w", absPath, err)
			}
		}

		resolvedDirs = append(resolvedDirs, resolvedPath)
	}

	// Create scanner with progress enabled (unless in cron mode)
	scanner := v.ScannerFactory(snapshot.ScannerParams{
		EnableProgress: !opts.Cron,
		Fs:             v.Fs,
	})

	// Statistics tracking
	totalFiles := 0
	totalBytes := int64(0)
	totalChunks := 0
	totalBlobs := 0
	totalBytesSkipped := int64(0)
	totalFilesSkipped := 0
	totalFilesDeleted := 0
	totalBytesDeleted := int64(0)
	totalBytesUploaded := int64(0)
	totalBlobsUploaded := 0
	uploadDuration := time.Duration(0)

	// Create a new snapshot at the beginning
	snapshotID, err := v.SnapshotManager.CreateSnapshot(v.ctx, hostname, v.Globals.Version, v.Globals.Commit)
	if err != nil {
		return fmt.Errorf("creating snapshot: %w", err)
	}
	log.Info("Beginning snapshot", "snapshot_id", snapshotID)
	_, _ = fmt.Fprintf(v.Stdout, "Beginning snapshot: %s\n", snapshotID)

	for i, dir := range resolvedDirs {
		// Check if context is cancelled
		select {
		case <-v.ctx.Done():
			log.Info("Snapshot creation cancelled")
			return v.ctx.Err()
		default:
		}

		log.Info("Scanning directory", "path", dir)
		_, _ = fmt.Fprintf(v.Stdout, "Beginning directory scan (%d/%d): %s\n", i+1, len(resolvedDirs), dir)
		result, err := scanner.Scan(v.ctx, dir, snapshotID)
		if err != nil {
			return fmt.Errorf("failed to scan %s: %w", dir, err)
		}

		totalFiles += result.FilesScanned
		totalBytes += result.BytesScanned
		totalChunks += result.ChunksCreated
		totalBlobs += result.BlobsCreated
		totalFilesSkipped += result.FilesSkipped
		totalBytesSkipped += result.BytesSkipped
		totalFilesDeleted += result.FilesDeleted
		totalBytesDeleted += result.BytesDeleted

		log.Info("Directory scan complete",
			"path", dir,
			"files", result.FilesScanned,
			"files_skipped", result.FilesSkipped,
			"bytes", result.BytesScanned,
			"bytes_skipped", result.BytesSkipped,
			"chunks", result.ChunksCreated,
			"blobs", result.BlobsCreated,
			"duration", result.EndTime.Sub(result.StartTime))

		// Remove per-directory summary - the scanner already prints its own summary
	}

	// Get upload statistics from scanner progress if available
	if s := scanner.GetProgress(); s != nil {
		stats := s.GetStats()
		totalBytesUploaded = stats.BytesUploaded.Load()
		totalBlobsUploaded = int(stats.BlobsUploaded.Load())
		uploadDuration = time.Duration(stats.UploadDurationMs.Load()) * time.Millisecond
	}

	// Update snapshot statistics with extended fields
	extStats := snapshot.ExtendedBackupStats{
		BackupStats: snapshot.BackupStats{
			FilesScanned:  totalFiles,
			BytesScanned:  totalBytes,
			ChunksCreated: totalChunks,
			BlobsCreated:  totalBlobs,
			BytesUploaded: totalBytesUploaded,
		},
		BlobUncompressedSize: 0, // Will be set from database query below
		CompressionLevel:     v.Config.CompressionLevel,
		UploadDurationMs:     uploadDuration.Milliseconds(),
	}

	if err := v.SnapshotManager.UpdateSnapshotStatsExtended(v.ctx, snapshotID, extStats); err != nil {
		return fmt.Errorf("updating snapshot stats: %w", err)
	}

	// Mark snapshot as complete
	if err := v.SnapshotManager.CompleteSnapshot(v.ctx, snapshotID); err != nil {
		return fmt.Errorf("completing snapshot: %w", err)
	}

	// Export snapshot metadata
	// Export snapshot metadata without closing the database
	// The export function should handle its own database connection
	if err := v.SnapshotManager.ExportSnapshotMetadata(v.ctx, v.Config.IndexPath, snapshotID); err != nil {
		return fmt.Errorf("exporting snapshot metadata: %w", err)
	}

	// Calculate final statistics
	snapshotDuration := time.Since(snapshotStartTime)
	totalFilesChanged := totalFiles - totalFilesSkipped
	totalBytesChanged := totalBytes
	totalBytesAll := totalBytes + totalBytesSkipped

	// Calculate upload speed
	var avgUploadSpeed string
	if totalBytesUploaded > 0 && uploadDuration > 0 {
		bytesPerSec := float64(totalBytesUploaded) / uploadDuration.Seconds()
		bitsPerSec := bytesPerSec * 8
		if bitsPerSec >= 1e9 {
			avgUploadSpeed = fmt.Sprintf("%.1f Gbit/s", bitsPerSec/1e9)
		} else if bitsPerSec >= 1e6 {
			avgUploadSpeed = fmt.Sprintf("%.0f Mbit/s", bitsPerSec/1e6)
		} else if bitsPerSec >= 1e3 {
			avgUploadSpeed = fmt.Sprintf("%.0f Kbit/s", bitsPerSec/1e3)
		} else {
			avgUploadSpeed = fmt.Sprintf("%.0f bit/s", bitsPerSec)
		}
	} else {
		avgUploadSpeed = "N/A"
	}

	// Get total blob sizes from database
	totalBlobSizeCompressed := int64(0)
	totalBlobSizeUncompressed := int64(0)
	if blobHashes, err := v.Repositories.Snapshots.GetBlobHashes(v.ctx, snapshotID); err == nil {
		for _, hash := range blobHashes {
			if blob, err := v.Repositories.Blobs.GetByHash(v.ctx, hash); err == nil && blob != nil {
				totalBlobSizeCompressed += blob.CompressedSize
				totalBlobSizeUncompressed += blob.UncompressedSize
			}
		}
	}

	// Calculate compression ratio
	var compressionRatio float64
	if totalBlobSizeUncompressed > 0 {
		compressionRatio = float64(totalBlobSizeCompressed) / float64(totalBlobSizeUncompressed)
	} else {
		compressionRatio = 1.0
	}

	// Print comprehensive summary
	_, _ = fmt.Fprintf(v.Stdout, "=== Snapshot Complete ===\n")
	_, _ = fmt.Fprintf(v.Stdout, "ID: %s\n", snapshotID)
	_, _ = fmt.Fprintf(v.Stdout, "Files: %s examined, %s to process, %s unchanged",
		formatNumber(totalFiles),
		formatNumber(totalFilesChanged),
		formatNumber(totalFilesSkipped))
	if totalFilesDeleted > 0 {
		_, _ = fmt.Fprintf(v.Stdout, ", %s deleted", formatNumber(totalFilesDeleted))
	}
	_, _ = fmt.Fprintln(v.Stdout)
	_, _ = fmt.Fprintf(v.Stdout, "Data: %s total (%s to process)",
		humanize.Bytes(uint64(totalBytesAll)),
		humanize.Bytes(uint64(totalBytesChanged)))
	if totalBytesDeleted > 0 {
		_, _ = fmt.Fprintf(v.Stdout, ", %s deleted", humanize.Bytes(uint64(totalBytesDeleted)))
	}
	_, _ = fmt.Fprintln(v.Stdout)
	if totalBlobsUploaded > 0 {
		_, _ = fmt.Fprintf(v.Stdout, "Storage: %s compressed from %s (%.2fx)\n",
			humanize.Bytes(uint64(totalBlobSizeCompressed)),
			humanize.Bytes(uint64(totalBlobSizeUncompressed)),
			compressionRatio)
		_, _ = fmt.Fprintf(v.Stdout, "Upload: %d blobs, %s in %s (%s)\n",
			totalBlobsUploaded,
			humanize.Bytes(uint64(totalBytesUploaded)),
			formatDuration(uploadDuration),
			avgUploadSpeed)
	}
	_, _ = fmt.Fprintf(v.Stdout, "Duration: %s\n", formatDuration(snapshotDuration))

	if opts.Prune {
		log.Info("Pruning enabled - will delete old snapshots after snapshot")
		// TODO: Implement pruning
	}

	return nil
}

// ListSnapshots lists all snapshots
func (v *Vaultik) ListSnapshots(jsonOutput bool) error {
	// Get all remote snapshots
	remoteSnapshots := make(map[string]bool)
	objectCh := v.S3Client.ListObjectsStream(v.ctx, "metadata/", false)

	for object := range objectCh {
		if object.Err != nil {
			return fmt.Errorf("listing remote snapshots: %w", object.Err)
		}

		// Extract snapshot ID from paths like metadata/hostname-20240115-143052Z/
		parts := strings.Split(object.Key, "/")
		if len(parts) >= 2 && parts[0] == "metadata" && parts[1] != "" {
			remoteSnapshots[parts[1]] = true
		}
	}

	// Get all local snapshots
	localSnapshots, err := v.Repositories.Snapshots.ListRecent(v.ctx, 10000)
	if err != nil {
		return fmt.Errorf("listing local snapshots: %w", err)
	}

	// Build a map of local snapshots for quick lookup
	localSnapshotMap := make(map[string]*database.Snapshot)
	for _, s := range localSnapshots {
		localSnapshotMap[s.ID] = s
	}

	// Remove local snapshots that don't exist remotely
	for _, snapshot := range localSnapshots {
		if !remoteSnapshots[snapshot.ID] {
			log.Info("Removing local snapshot not found in remote", "snapshot_id", snapshot.ID)

			// Delete related records first to avoid foreign key constraints
			if err := v.Repositories.Snapshots.DeleteSnapshotFiles(v.ctx, snapshot.ID); err != nil {
				log.Error("Failed to delete snapshot files", "snapshot_id", snapshot.ID, "error", err)
			}
			if err := v.Repositories.Snapshots.DeleteSnapshotBlobs(v.ctx, snapshot.ID); err != nil {
				log.Error("Failed to delete snapshot blobs", "snapshot_id", snapshot.ID, "error", err)
			}
			if err := v.Repositories.Snapshots.DeleteSnapshotUploads(v.ctx, snapshot.ID); err != nil {
				log.Error("Failed to delete snapshot uploads", "snapshot_id", snapshot.ID, "error", err)
			}

			// Now delete the snapshot itself
			if err := v.Repositories.Snapshots.Delete(v.ctx, snapshot.ID); err != nil {
				log.Error("Failed to delete local snapshot", "snapshot_id", snapshot.ID, "error", err)
			} else {
				log.Info("Deleted local snapshot not found in remote", "snapshot_id", snapshot.ID)
				delete(localSnapshotMap, snapshot.ID)
			}
		}
	}

	// Build final snapshot list
	snapshots := make([]SnapshotInfo, 0, len(remoteSnapshots))

	for snapshotID := range remoteSnapshots {
		// Check if we have this snapshot locally
		if localSnap, exists := localSnapshotMap[snapshotID]; exists && localSnap.CompletedAt != nil {
			// Get total compressed size of all blobs referenced by this snapshot
			totalSize, err := v.Repositories.Snapshots.GetSnapshotTotalCompressedSize(v.ctx, snapshotID)
			if err != nil {
				log.Warn("Failed to get total compressed size", "id", snapshotID, "error", err)
				// Fall back to stored blob size
				totalSize = localSnap.BlobSize
			}

			snapshots = append(snapshots, SnapshotInfo{
				ID:             localSnap.ID,
				Timestamp:      localSnap.StartedAt,
				CompressedSize: totalSize,
			})
		} else {
			// Remote snapshot not in local DB - fetch manifest to get size
			timestamp, err := parseSnapshotTimestamp(snapshotID)
			if err != nil {
				log.Warn("Failed to parse snapshot timestamp", "id", snapshotID, "error", err)
				continue
			}

			// Try to download manifest to get size
			totalSize, err := v.getManifestSize(snapshotID)
			if err != nil {
				return fmt.Errorf("failed to get manifest size for %s: %w", snapshotID, err)
			}

			snapshots = append(snapshots, SnapshotInfo{
				ID:             snapshotID,
				Timestamp:      timestamp,
				CompressedSize: totalSize,
			})
		}
	}

	// Sort by timestamp (newest first)
	sort.Slice(snapshots, func(i, j int) bool {
		return snapshots[i].Timestamp.After(snapshots[j].Timestamp)
	})

	if jsonOutput {
		// JSON output
		encoder := json.NewEncoder(os.Stdout)
		encoder.SetIndent("", "  ")
		return encoder.Encode(snapshots)
	}

	// Table output
	w := tabwriter.NewWriter(os.Stdout, 0, 0, 3, ' ', 0)
	if _, err := fmt.Fprintln(w, "SNAPSHOT ID\tTIMESTAMP\tCOMPRESSED SIZE"); err != nil {
		return err
	}
	if _, err := fmt.Fprintln(w, "───────────\t─────────\t───────────────"); err != nil {
		return err
	}

	for _, snap := range snapshots {
		if _, err := fmt.Fprintf(w, "%s\t%s\t%s\n",
			snap.ID,
			snap.Timestamp.Format("2006-01-02 15:04:05"),
			formatBytes(snap.CompressedSize)); err != nil {
			return err
		}
	}

	return w.Flush()
}

// PurgeSnapshots removes old snapshots based on criteria
func (v *Vaultik) PurgeSnapshots(keepLatest bool, olderThan string, force bool) error {
	// Sync with remote first
	if err := v.syncWithRemote(); err != nil {
		return fmt.Errorf("syncing with remote: %w", err)
	}

	// Get snapshots from local database
	dbSnapshots, err := v.Repositories.Snapshots.ListRecent(v.ctx, 10000)
	if err != nil {
		return fmt.Errorf("listing snapshots: %w", err)
	}

	// Convert to SnapshotInfo format, only including completed snapshots
	snapshots := make([]SnapshotInfo, 0, len(dbSnapshots))
	for _, s := range dbSnapshots {
		if s.CompletedAt != nil {
			snapshots = append(snapshots, SnapshotInfo{
				ID:             s.ID,
				Timestamp:      s.StartedAt,
				CompressedSize: s.BlobSize,
			})
		}
	}

	// Sort by timestamp (newest first)
	sort.Slice(snapshots, func(i, j int) bool {
		return snapshots[i].Timestamp.After(snapshots[j].Timestamp)
	})

	var toDelete []SnapshotInfo

	if keepLatest {
		// Keep only the most recent snapshot
		if len(snapshots) > 1 {
			toDelete = snapshots[1:]
		}
	} else if olderThan != "" {
		// Parse duration
		duration, err := parseDuration(olderThan)
		if err != nil {
			return fmt.Errorf("invalid duration: %w", err)
		}

		cutoff := time.Now().UTC().Add(-duration)
		for _, snap := range snapshots {
			if snap.Timestamp.Before(cutoff) {
				toDelete = append(toDelete, snap)
			}
		}
	}

	if len(toDelete) == 0 {
		fmt.Println("No snapshots to delete")
		return nil
	}

	// Show what will be deleted
	fmt.Printf("The following snapshots will be deleted:\n\n")
	for _, snap := range toDelete {
		fmt.Printf("  %s (%s, %s)\n",
			snap.ID,
			snap.Timestamp.Format("2006-01-02 15:04:05"),
			formatBytes(snap.CompressedSize))
	}

	// Confirm unless --force is used
	if !force {
		fmt.Printf("\nDelete %d snapshot(s)? [y/N] ", len(toDelete))
		var confirm string
		if _, err := fmt.Scanln(&confirm); err != nil {
			// Treat EOF or error as "no"
			fmt.Println("Cancelled")
			return nil
		}
		if strings.ToLower(confirm) != "y" {
			fmt.Println("Cancelled")
			return nil
		}
	} else {
		fmt.Printf("\nDeleting %d snapshot(s) (--force specified)\n", len(toDelete))
	}

	// Delete snapshots
	for _, snap := range toDelete {
		log.Info("Deleting snapshot", "id", snap.ID)
		if err := v.deleteSnapshot(snap.ID); err != nil {
			return fmt.Errorf("deleting snapshot %s: %w", snap.ID, err)
		}
	}

	fmt.Printf("Deleted %d snapshot(s)\n", len(toDelete))

	// Note: Run 'vaultik prune' separately to clean up unreferenced blobs
	fmt.Println("\nNote: Run 'vaultik prune' to clean up unreferenced blobs.")

	return nil
}

// VerifySnapshot checks snapshot integrity
func (v *Vaultik) VerifySnapshot(snapshotID string, deep bool) error {
	// Parse snapshot ID to extract timestamp
	parts := strings.Split(snapshotID, "-")
	var snapshotTime time.Time
	if len(parts) >= 3 {
		// Format: hostname-YYYYMMDD-HHMMSSZ
		dateStr := parts[len(parts)-2]
		timeStr := parts[len(parts)-1]
		if len(dateStr) == 8 && len(timeStr) == 7 && strings.HasSuffix(timeStr, "Z") {
			timeStr = timeStr[:6] // Remove Z
			timestamp, err := time.Parse("20060102150405", dateStr+timeStr)
			if err == nil {
				snapshotTime = timestamp
			}
		}
	}

	fmt.Printf("Verifying snapshot %s\n", snapshotID)
	if !snapshotTime.IsZero() {
		fmt.Printf("Snapshot time: %s\n", snapshotTime.Format("2006-01-02 15:04:05 MST"))
	}
	fmt.Println()

	// Download and parse manifest
	manifest, err := v.downloadManifest(snapshotID)
	if err != nil {
		return fmt.Errorf("downloading manifest: %w", err)
	}

	fmt.Printf("Snapshot information:\n")
	fmt.Printf("  Blob count:   %d\n", manifest.BlobCount)
	fmt.Printf("  Total size:   %s\n", humanize.Bytes(uint64(manifest.TotalCompressedSize)))
	if manifest.Timestamp != "" {
		if t, err := time.Parse(time.RFC3339, manifest.Timestamp); err == nil {
			fmt.Printf("  Created:      %s\n", t.Format("2006-01-02 15:04:05 MST"))
		}
	}
	fmt.Println()

	// Check each blob exists
	fmt.Printf("Checking blob existence...\n")
	missing := 0
	verified := 0
	missingSize := int64(0)

	for _, blob := range manifest.Blobs {
		blobPath := fmt.Sprintf("blobs/%s/%s/%s", blob.Hash[:2], blob.Hash[2:4], blob.Hash)

		if deep {
			// Download and verify hash
			// TODO: Implement deep verification
			fmt.Printf("Deep verification not yet implemented\n")
			return nil
		} else {
			// Just check existence
			_, err := v.S3Client.StatObject(v.ctx, blobPath)
			if err != nil {
				fmt.Printf("  Missing: %s (%s)\n", blob.Hash, humanize.Bytes(uint64(blob.CompressedSize)))
				missing++
				missingSize += blob.CompressedSize
			} else {
				verified++
			}
		}
	}

	fmt.Printf("\nVerification complete:\n")
	fmt.Printf("  Verified:     %d blobs (%s)\n", verified,
		humanize.Bytes(uint64(manifest.TotalCompressedSize-missingSize)))
	if missing > 0 {
		fmt.Printf("  Missing:      %d blobs (%s)\n", missing, humanize.Bytes(uint64(missingSize)))
	} else {
		fmt.Printf("  Missing:      0 blobs\n")
	}
	fmt.Printf("  Status:       ")
	if missing > 0 {
		fmt.Printf("FAILED - %d blobs are missing\n", missing)
		return fmt.Errorf("%d blobs are missing", missing)
	} else {
		fmt.Printf("OK - All blobs verified\n")
	}

	return nil
}

// Helper methods that were previously on SnapshotApp

func (v *Vaultik) getManifestSize(snapshotID string) (int64, error) {
	manifestPath := fmt.Sprintf("metadata/%s/manifest.json.zst", snapshotID)

	reader, err := v.S3Client.GetObject(v.ctx, manifestPath)
	if err != nil {
		return 0, fmt.Errorf("downloading manifest: %w", err)
	}
	defer func() { _ = reader.Close() }()

	manifest, err := snapshot.DecodeManifest(reader)
	if err != nil {
		return 0, fmt.Errorf("decoding manifest: %w", err)
	}

	return manifest.TotalCompressedSize, nil
}

func (v *Vaultik) downloadManifest(snapshotID string) (*snapshot.Manifest, error) {
	manifestPath := fmt.Sprintf("metadata/%s/manifest.json.zst", snapshotID)

	reader, err := v.S3Client.GetObject(v.ctx, manifestPath)
	if err != nil {
		return nil, err
	}
	defer func() { _ = reader.Close() }()

	manifest, err := snapshot.DecodeManifest(reader)
	if err != nil {
		return nil, fmt.Errorf("decoding manifest: %w", err)
	}

	return manifest, nil
}

func (v *Vaultik) deleteSnapshot(snapshotID string) error {
	// First, delete from S3
	// List all objects under metadata/{snapshotID}/
	prefix := fmt.Sprintf("metadata/%s/", snapshotID)
	objectCh := v.S3Client.ListObjectsStream(v.ctx, prefix, true)

	var objectsToDelete []string
	for object := range objectCh {
		if object.Err != nil {
			return fmt.Errorf("listing objects: %w", object.Err)
		}
		objectsToDelete = append(objectsToDelete, object.Key)
	}

	// Delete all objects
	for _, key := range objectsToDelete {
		if err := v.S3Client.RemoveObject(v.ctx, key); err != nil {
			return fmt.Errorf("removing %s: %w", key, err)
		}
	}

	// Then, delete from local database
	// Delete related records first to avoid foreign key constraints
	if err := v.Repositories.Snapshots.DeleteSnapshotFiles(v.ctx, snapshotID); err != nil {
		log.Error("Failed to delete snapshot files", "snapshot_id", snapshotID, "error", err)
	}
	if err := v.Repositories.Snapshots.DeleteSnapshotBlobs(v.ctx, snapshotID); err != nil {
		log.Error("Failed to delete snapshot blobs", "snapshot_id", snapshotID, "error", err)
	}
	if err := v.Repositories.Snapshots.DeleteSnapshotUploads(v.ctx, snapshotID); err != nil {
		log.Error("Failed to delete snapshot uploads", "snapshot_id", snapshotID, "error", err)
	}

	// Now delete the snapshot itself
	if err := v.Repositories.Snapshots.Delete(v.ctx, snapshotID); err != nil {
		return fmt.Errorf("deleting snapshot from database: %w", err)
	}

	return nil
}

func (v *Vaultik) syncWithRemote() error {
	log.Info("Syncing with remote snapshots")

	// Get all remote snapshot IDs
	remoteSnapshots := make(map[string]bool)
	objectCh := v.S3Client.ListObjectsStream(v.ctx, "metadata/", false)

	for object := range objectCh {
		if object.Err != nil {
			return fmt.Errorf("listing remote snapshots: %w", object.Err)
		}

		// Extract snapshot ID from paths like metadata/hostname-20240115-143052Z/
		parts := strings.Split(object.Key, "/")
		if len(parts) >= 2 && parts[0] == "metadata" && parts[1] != "" {
			remoteSnapshots[parts[1]] = true
		}
	}

	log.Debug("Found remote snapshots", "count", len(remoteSnapshots))

	// Get all local snapshots (use a high limit to get all)
	localSnapshots, err := v.Repositories.Snapshots.ListRecent(v.ctx, 10000)
	if err != nil {
		return fmt.Errorf("listing local snapshots: %w", err)
	}

	// Remove local snapshots that don't exist remotely
	removedCount := 0
	for _, snapshot := range localSnapshots {
		if !remoteSnapshots[snapshot.ID] {
			log.Info("Removing local snapshot not found in remote", "snapshot_id", snapshot.ID)
			if err := v.Repositories.Snapshots.Delete(v.ctx, snapshot.ID); err != nil {
				log.Error("Failed to delete local snapshot", "snapshot_id", snapshot.ID, "error", err)
			} else {
				removedCount++
			}
		}
	}

	if removedCount > 0 {
		log.Info("Removed local snapshots not found in remote", "count", removedCount)
	}

	return nil
}