update

model/scanner.go

@@ -0,0 +1,81 @@
+package model
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// ScanTarget represents a specific folder within a library to be scanned.
+// NOTE: This struct is used as a map key, so it should only contain comparable types.
+type ScanTarget struct {
+	LibraryID  int
+	FolderPath string // Relative path within the library, or "" for entire library
+}
+
+func (st ScanTarget) String() string {
+	return fmt.Sprintf("%d:%s", st.LibraryID, st.FolderPath)
+}
+
+// ScannerStatus holds information about the current scan status
+type ScannerStatus struct {
+	Scanning    bool
+	LastScan    time.Time
+	Count       uint32
+	FolderCount uint32
+	LastError   string
+	ScanType    string
+	ElapsedTime time.Duration
+}
+
+type Scanner interface {
+	// ScanAll starts a scan of all libraries. This is a blocking operation.
+	ScanAll(ctx context.Context, fullScan bool) (warnings []string, err error)
+	// ScanFolders scans specific library/folder pairs, recursing into subdirectories.
+	// If targets is nil, it scans all libraries. This is a blocking operation.
+	ScanFolders(ctx context.Context, fullScan bool, targets []ScanTarget) (warnings []string, err error)
+	Status(context.Context) (*ScannerStatus, error)
+}
+
+// ParseTargets parses scan targets strings into ScanTarget structs.
+// Example: []string{"1:Music/Rock", "2:Classical"}
+func ParseTargets(libFolders []string) ([]ScanTarget, error) {
+	targets := make([]ScanTarget, 0, len(libFolders))
+
+	for _, part := range libFolders {
+		part = strings.TrimSpace(part)
+		if part == "" {
+			continue
+		}
+
+		// Split by the first colon
+		colonIdx := strings.Index(part, ":")
+		if colonIdx == -1 {
+			return nil, fmt.Errorf("invalid target format: %q (expected libraryID:folderPath)", part)
+		}
+
+		libIDStr := part[:colonIdx]
+		folderPath := part[colonIdx+1:]
+
+		libID, err := strconv.Atoi(libIDStr)
+		if err != nil {
+			return nil, fmt.Errorf("invalid library ID %q: %w", libIDStr, err)
+		}
+		if libID <= 0 {
+			return nil, fmt.Errorf("invalid library ID %q", libIDStr)
+		}
+
+		targets = append(targets, ScanTarget{
+			LibraryID:  libID,
+			FolderPath: folderPath,
+		})
+	}
+
+	if len(targets) == 0 {
+		return nil, fmt.Errorf("no valid targets found")
+	}
+
+	return targets, nil
+}