fix: Implement proper scrolling and sorting for Analysis calls list

internal/sip/callflow.go

@@ -153,6 +153,27 @@ func (s *CallFlowStore) GetRecentFlows(n int) []*CallFlow {
 	return flows
 }
 
+// GetSortedFlows returns all call flows sorted by StartTime (oldest first)
+func (s *CallFlowStore) GetSortedFlows() []*CallFlow {
+	flows := s.GetAllFlows()
+
+	// Sort by start time ascending (oldest first), then by CallID for stable order
+	for i := 0; i < len(flows)-1; i++ {
+		for j := i + 1; j < len(flows); j++ {
+			// Compare by StartTime first
+			if flows[i].StartTime.After(flows[j].StartTime) {
+				flows[i], flows[j] = flows[j], flows[i]
+			} else if flows[i].StartTime.Equal(flows[j].StartTime) {
+				// If same time, sort by CallID for stable order
+				if flows[i].CallID > flows[j].CallID {
+					flows[i], flows[j] = flows[j], flows[i]
+				}
+			}
+		}
+	}
+	return flows
+}
+
 // Count returns the number of call flows
 func (s *CallFlowStore) Count() int {
 	s.mu.RLock()

internal/tui/model.go

@@ -79,6 +79,7 @@ type Model struct {
 	callFlowStore *sip.CallFlowStore
 
 	// Call flow analysis
+	analysisOffset      int // For pagination in analysis view
 	selectedFlow        int
 	selectedPacketIndex int
 	flowList            list.Model
@@ -484,11 +485,51 @@ func (m *Model) handleViewKeys(msg tea.KeyMsg) tea.Cmd {
 		case "up", "k":
 			if m.selectedFlow > 0 {
 				m.selectedFlow--
+				if m.selectedFlow < m.analysisOffset {
+					m.analysisOffset = m.selectedFlow
+				}
 			}
 		case "down", "j":
-			flows := m.callFlowStore.GetRecentFlows(20)
+			flows := m.callFlowStore.GetSortedFlows()
 			if m.selectedFlow < len(flows)-1 {
 				m.selectedFlow++
+				// Check if we need to scroll down
+				// Visible height calculation (approximate)
+				headerHeight := 4 // Title + Call count + padding
+				footerHeight := 2 // Help text
+				availableHeight := m.height - headerHeight - footerHeight
+				if availableHeight < 5 {
+					availableHeight = 5
+				}
+
+				if m.selectedFlow >= m.analysisOffset+availableHeight {
+					m.analysisOffset++
+				}
+			}
+		case "pgup":
+			m.selectedFlow -= 10
+			if m.selectedFlow < 0 {
+				m.selectedFlow = 0
+			}
+			if m.selectedFlow < m.analysisOffset {
+				m.analysisOffset = m.selectedFlow
+			}
+		case "pgdown":
+			flows := m.callFlowStore.GetSortedFlows()
+			m.selectedFlow += 10
+			if m.selectedFlow >= len(flows) {
+				m.selectedFlow = len(flows) - 1
+			}
+
+			headerHeight := 4
+			footerHeight := 2
+			availableHeight := m.height - headerHeight - footerHeight
+			if availableHeight < 5 {
+				availableHeight = 5
+			}
+
+			if m.selectedFlow >= m.analysisOffset+availableHeight {
+				m.analysisOffset = m.selectedFlow - availableHeight + 1
 			}
 		case "enter":
 			m.subView = SubViewCallDetail
@@ -1209,7 +1250,7 @@ func (m Model) viewCapture() string {
 func (m Model) viewAnalysis() string {
 	title := m.styles.Title.Render("📊 Analysis")
 
-	flows := m.callFlowStore.GetRecentFlows(20)
+	flows := m.callFlowStore.GetSortedFlows()
 
 	if len(flows) == 0 {
 		return lipgloss.JoinVertical(lipgloss.Left, title,
@@ -1221,8 +1262,9 @@ func (m Model) viewAnalysis() string {
 	}
 
 	var lines []string
-	lines = append(lines, fmt.Sprintf("Calls: %d", len(flows)))
-	lines = append(lines, "")
+	// Header is handled in return statement now
+	// lines = append(lines, fmt.Sprintf("Calls: %d", len(flows)))
+	// lines = append(lines, "")
 
 	for i, flow := range flows {
 		prefix := "  "
@@ -1253,10 +1295,35 @@ func (m Model) viewAnalysis() string {
 		lines = append(lines, style.Render(summary))
 	}
 
-	lines = append(lines, "")
-	lines = append(lines, m.styles.Help.Render("↑/↓ select • Enter details • q quit"))
+	// Apply Viewport/Scrolling
+	headerHeight := 4 // Title + Call count + padding
+	footerHeight := 2 // Help text
+	availableHeight := m.height - headerHeight - footerHeight
+	if availableHeight < 5 {
+		availableHeight = 5
+	}
 
-	return lipgloss.JoinVertical(lipgloss.Left, title, lipgloss.JoinVertical(lipgloss.Left, lines...))
+	// Sanity check offset
+	if m.analysisOffset > len(lines)-1 {
+		m.analysisOffset = len(lines) - 1
+	}
+	if m.analysisOffset < 0 {
+		m.analysisOffset = 0
+	}
+
+	end := m.analysisOffset + availableHeight
+	if end > len(lines) {
+		end = len(lines)
+	}
+
+	visibleLines := lines[m.analysisOffset:end]
+
+	return lipgloss.JoinVertical(lipgloss.Left, title,
+		fmt.Sprintf("Calls: %d (Showing %d-%d)", len(flows), m.analysisOffset+1, end),
+		"",
+		lipgloss.JoinVertical(lipgloss.Left, visibleLines...),
+		"",
+		m.styles.Help.Render("↑/↓ select • Enter details • q quit"))
 }
 
 func (m Model) viewNetworkMap() string {