feat: vtt converting

internal/model/model.go

@@ -22,3 +22,63 @@ type SRTEntry struct {
 	EndTime   Timestamp
 	Content   string
 }
+
+// SubtitleEntry represents a generic subtitle entry in our intermediate representation
+type SubtitleEntry struct {
+	Index      int                    // Sequential index/number
+	StartTime  Timestamp              // Start time
+	EndTime    Timestamp              // End time
+	Text       string                 // The subtitle text content
+	Styles     map[string]string      // Styling information (e.g., VTT's align, position)
+	Classes    []string               // CSS classes (for VTT)
+	Metadata   map[string]string      // Additional metadata
+	FormatData map[string]interface{} // Format-specific data that doesn't fit elsewhere
+}
+
+// Subtitle represents our intermediate subtitle representation used for conversions
+type Subtitle struct {
+	Title       string                  // Optional title
+	Metadata    map[string]string       // Global metadata (e.g., LRC's ti, ar, al)
+	Entries     []SubtitleEntry         // Subtitle entries
+	Format      string                  // Source format
+	Styles      map[string]string       // Global styles (e.g., VTT STYLE blocks)
+	Comments    []string                // Comments/notes (for VTT)
+	Regions     []SubtitleRegion        // Region definitions (for VTT)
+	FormatData  map[string]interface{}  // Format-specific data that doesn't fit elsewhere
+}
+
+// SubtitleRegion represents a region definition (mainly for VTT)
+type SubtitleRegion struct {
+	ID       string
+	Settings map[string]string
+}
+
+// Creates a new empty Subtitle
+func NewSubtitle() Subtitle {
+	return Subtitle{
+		Metadata:   make(map[string]string),
+		Entries:    []SubtitleEntry{},
+		Styles:     make(map[string]string),
+		Comments:   []string{},
+		Regions:    []SubtitleRegion{},
+		FormatData: make(map[string]interface{}),
+	}
+}
+
+// Creates a new empty SubtitleEntry
+func NewSubtitleEntry() SubtitleEntry {
+	return SubtitleEntry{
+		Styles:     make(map[string]string),
+		Classes:    []string{},
+		Metadata:   make(map[string]string),
+		FormatData: make(map[string]interface{}),
+	}
+}
+
+// Creates a new SubtitleRegion
+func NewSubtitleRegion(id string) SubtitleRegion {
+	return SubtitleRegion{
+		ID:       id,
+		Settings: make(map[string]string),
+	}
+}