Add storage analytics page

internal/file/service.go

@@ -4,9 +4,11 @@ import (
 	"io"
 	"os"
 	"path/filepath"
+	"sort"
 	"time"
 
 	"github.com/google/uuid"
+	"github.com/shirou/gopsutil/v3/disk"
 )
 
 type Service struct {
@@ -209,3 +211,66 @@ func (s *Service) buildPath(id, filename string) string {
 func (s *Service) GetAllFiles() ([]FileRecord, error) {
 	return s.repo.GetAll()
 }
+
+func (s *Service) GetStorageStats() (*StorageStats, error) {
+	files, err := s.repo.GetAll()
+	if err != nil {
+		return nil, err
+	}
+
+	stats := &StorageStats{}
+
+	var total int64
+	var active, deleted int
+
+	for _, f := range files {
+		stats.TotalFiles++
+
+		if f.Deleted {
+			deleted++
+		} else {
+			active++
+		}
+
+		total += f.Size
+	}
+
+	stats.TotalBytes = total
+	stats.ActiveFiles = active
+	stats.DeletedFiles = deleted
+
+	if stats.TotalFiles > 0 {
+		stats.AverageFileSize = total / int64(stats.TotalFiles)
+	}
+
+	// Biggest files
+	sort.Slice(files, func(i, j int) bool {
+		return files[i].Size > files[j].Size
+	})
+
+	if len(files) > 10 {
+		stats.LargestFiles = files[:10]
+	} else {
+		stats.LargestFiles = files
+	}
+
+	usage, err := disk.Usage(s.storageDir)
+	if err == nil {
+		stats.DiskTotalBytes = int64(usage.Total)
+		stats.DiskFreeBytes = int64(usage.Free)
+		stats.DiskUsedBytes = int64(usage.Used)
+	}
+
+	// tmp chunk usage
+	var tmpTotal int64
+	filepath.Walk("tmp", func(path string, info os.FileInfo, err error) error {
+		if err == nil && !info.IsDir() {
+			tmpTotal += info.Size()
+		}
+		return nil
+	})
+
+	stats.TempBytes = tmpTotal
+
+	return stats, nil
+}

internal/file/stats.go

@@ -0,0 +1,18 @@
+package file
+
+type StorageStats struct {
+	TotalFiles   int
+	ActiveFiles  int
+	DeletedFiles int
+
+	TotalBytes      int64
+	AverageFileSize int64
+
+	DiskTotalBytes int64
+	DiskFreeBytes  int64
+	DiskUsedBytes  int64
+
+	TempBytes int64
+
+	LargestFiles []FileRecord
+}