2 files changed, 135 insertions, 0 deletions
diff --git a/internal/tui/flamegraph/model.go b/internal/tui/flamegraph/model.go
new file mode 100644
index 0000000..dd77201
--- /dev/null
+++ b/internal/tui/flamegraph/model.go
@@ -0,0 +1,104 @@
+package flamegraph
+
+import (
+	"image/color"
+	coreflamegraph "ior/internal/flamegraph"
+	common "ior/internal/tui/common"
+
+	tea "charm.land/bubbletea/v2"
+)
+
+type snapshotNode struct {
+	Name     string          `json:"n"`
+	Value    uint64          `json:"v"`
+	Total    uint64          `json:"t"`
+	Children []*snapshotNode `json:"c,omitempty"`
+}
+
+type zoomState struct {
+	path        string
+	selectedIdx int
+}
+
+type frameSpring struct{}
+
+// Model is the Bubble Tea model for the TUI flamegraph tab.
+type Model struct {
+	liveTrie    *coreflamegraph.LiveTrie
+	lastVersion uint64
+	snapshot    *snapshotNode
+
+	frames       []tuiFrame
+	targetFrames []tuiFrame
+	width        int
+	height       int
+
+	selectedIdx int
+	zoomStack   []zoomState
+	zoomRoot    *snapshotNode
+
+	searchActive bool
+	searchQuery  string
+	matchIndices map[int]bool
+
+	fieldPresets [][]string
+	fieldIndex   int
+
+	springs []frameSpring
+	paused  bool
+	isDark  bool
+}
+
+// tuiFrame stores one terminal flamegraph frame cell.
+type tuiFrame struct {
+	Name    string
+	Col     int
+	Row     int
+	Width   int
+	Total   uint64
+	Percent float64
+	Fill    color.Color
+	Depth   int
+	Path    string
+}
+
+// NewModel constructs a flamegraph tab model with default state.
+func NewModel(liveTrie *coreflamegraph.LiveTrie) Model {
+	return Model{
+		liveTrie:     liveTrie,
+		matchIndices: make(map[int]bool),
+		fieldPresets: [][]string{
+			{"comm", "path"},
+			{"tracepoint", "comm", "path"},
+			{"pid", "tid", "comm", "path"},
+		},
+		isDark: true,
+	}
+}
+
+// Init starts the flamegraph model.
+func (m Model) Init() tea.Cmd {
+	return nil
+}
+
+// Update handles incoming messages.
+func (m Model) Update(tea.Msg) (tea.Model, tea.Cmd) {
+	return m, nil
+}
+
+// View renders the flamegraph viewport.
+func (m Model) View() tea.View {
+	content := common.PanelStyle.Render("Flame: model scaffold")
+	return tea.NewView(content)
+}
+
+// SetViewport updates model render dimensions.
+func (m *Model) SetViewport(width, height int) {
+	m.width = width
+	m.height = height
+}
+
+// SetDarkMode sets the active color theme mode.
+func (m *Model) SetDarkMode(isDark bool) {
+	m.isDark = isDark
+}
diff --git a/internal/tui/flamegraph/model_test.go b/internal/tui/flamegraph/model_test.go
new file mode 100644
index 0000000..42729bb
--- /dev/null
+++ b/internal/tui/flamegraph/model_test.go
@@ -0,0 +1,31 @@
+package flamegraph
+
+import "testing"
+
+func TestNewModelDefaults(t *testing.T) {
+	m := NewModel(nil)
+	if m.liveTrie != nil {
+		t.Fatalf("expected nil liveTrie when constructor input is nil")
+	}
+	if m.matchIndices == nil {
+		t.Fatalf("expected matchIndices map to be initialized")
+	}
+	if len(m.fieldPresets) == 0 {
+		t.Fatalf("expected default field presets to be initialized")
+	}
+	if !m.isDark {
+		t.Fatalf("expected dark mode enabled by default")
+	}
+}
+
+func TestSetViewportAndDarkMode(t *testing.T) {
+	m := NewModel(nil)
+	m.SetViewport(120, 40)
+	m.SetDarkMode(false)
+	if m.width != 120 || m.height != 40 {
+		t.Fatalf("expected viewport 120x40, got %dx%d", m.width, m.height)
+	}
+	if m.isDark {
+		t.Fatalf("expected dark mode to be disabled")
+	}
+}