feat: basic ass processing (without style)

internal/model/model.go

@@ -53,6 +53,34 @@ type SubtitleRegion struct {
 	Settings map[string]string
 }
 
+// ASSEvent represents an event entry in an ASS file (dialogue, comment, etc.)
+type ASSEvent struct {
+	Type       string    // Dialogue, Comment, etc.
+	Layer      int       // Layer number (0-based)
+	StartTime  Timestamp // Start time
+	EndTime    Timestamp // End time
+	Style      string    // Style name
+	Name       string    // Character name
+	MarginL    int       // Left margin override
+	MarginR    int       // Right margin override
+	MarginV    int       // Vertical margin override
+	Effect     string    // Transition effect
+	Text       string    // The actual text
+}
+
+// ASSStyle represents a style definition in an ASS file
+type ASSStyle struct {
+	Name       string            // Style name
+	Properties map[string]string // Font name, size, colors, etc.
+}
+
+// ASSFile represents an Advanced SubStation Alpha (ASS) file
+type ASSFile struct {
+	ScriptInfo map[string]string // Format, Title, ScriptType, etc.
+	Styles     []ASSStyle        // Style definitions
+	Events     []ASSEvent        // Dialogue lines
+}
+
 // Creates a new empty Subtitle
 func NewSubtitle() Subtitle {
 	return Subtitle{
@@ -82,3 +110,42 @@ func NewSubtitleRegion(id string) SubtitleRegion {
 		Settings: make(map[string]string),
 	}
 }
+
+// NewASSFile creates a new empty ASS file structure with minimal defaults
+func NewASSFile() ASSFile {
+	// Create minimal defaults for a valid ASS file
+	scriptInfo := map[string]string{
+		"ScriptType":   "v4.00+",
+		"Collisions":   "Normal",
+		"PlayResX":     "640",
+		"PlayResY":     "480",
+		"Timer":        "100.0000",
+	}
+
+	// Create a default style
+	defaultStyle := ASSStyle{
+		Name: "Default",
+		Properties: map[string]string{
+			"Format":      "Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding",
+			"Style":       "Default,Arial,20,&H00FFFFFF,&H000000FF,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,2,2,2,10,10,10,1",
+		},
+	}
+	
+	return ASSFile{
+		ScriptInfo: scriptInfo,
+		Styles:     []ASSStyle{defaultStyle},
+		Events:     []ASSEvent{},
+	}
+}
+
+// NewASSEvent creates a new ASS event with default values
+func NewASSEvent() ASSEvent {
+	return ASSEvent{
+		Type:      "Dialogue",
+		Layer:     0,
+		Style:     "Default",
+		MarginL:   0,
+		MarginR:   0,
+		MarginV:   0,
+	}
+}