tui: add dashboard tab framework model

1 files changed, 103 insertions, 0 deletions

diff --git a/internal/tui/dashboard/tabs.go b/internal/tui/dashboard/tabs.go
new file mode 100644
index 0000000..d456b44
--- /dev/null
+++ b/internal/tui/dashboard/tabs.go
@@ -0,0 +1,103 @@
+package dashboard
+
+import (
+	"ior/internal/tui"
+	"strings"
+
+	"github.com/charmbracelet/lipgloss"
+)
+
+// Tab is a dashboard tab identifier.
+type Tab int
+
+const (
+	// TabOverview is the high-level summary tab.
+	TabOverview Tab = iota
+	// TabSyscalls is the syscall table tab.
+	TabSyscalls
+	// TabFiles is the file ranking tab.
+	TabFiles
+	// TabProcesses is the process breakdown tab.
+	TabProcesses
+	// TabLatency is the latency histogram tab.
+	TabLatency
+	// TabGaps is the inter-syscall gap tab.
+	TabGaps
+)
+
+var allTabs = []Tab{
+	TabOverview,
+	TabSyscalls,
+	TabFiles,
+	TabProcesses,
+	TabLatency,
+	TabGaps,
+}
+
+func (t Tab) String() string {
+	switch t {
+	case TabOverview:
+		return "Overview"
+	case TabSyscalls:
+		return "Syscalls"
+	case TabFiles:
+		return "Files"
+	case TabProcesses:
+		return "Processes"
+	case TabLatency:
+		return "Latency"
+	case TabGaps:
+		return "Gaps"
+	default:
+		return "Unknown"
+	}
+}
+
+func nextTab(tab Tab) Tab {
+	idx := tabIndex(tab)
+	return allTabs[(idx+1)%len(allTabs)]
+}
+
+func prevTab(tab Tab) Tab {
+	idx := tabIndex(tab)
+	if idx == 0 {
+		return allTabs[len(allTabs)-1]
+	}
+	return allTabs[idx-1]
+}
+
+func tabIndex(tab Tab) int {
+	for i, candidate := range allTabs {
+		if candidate == tab {
+			return i
+		}
+	}
+	return 0
+}
+
+func renderTabBar(active Tab, width int) string {
+	parts := make([]string, 0, len(allTabs))
+	for _, tab := range allTabs {
+		label := tab.String()
+		if tab == active {
+			parts = append(parts, tui.TabActiveStyle.Render(label))
+		} else {
+			parts = append(parts, tui.TabInactiveStyle.Render(label))
+		}
+	}
+
+	bar := lipgloss.JoinHorizontal(lipgloss.Left, parts...)
+	if width <= 0 {
+		return bar
+	}
+	return lipgloss.NewStyle().Width(width).Render(bar)
+}
+
+func renderHelpBar(keys tui.KeyMap) string {
+	parts := make([]string, 0, len(keys.DashboardShortHelp()))
+	for _, binding := range keys.DashboardShortHelp() {
+		help := binding.Help()
+		parts = append(parts, help.Key+" "+help.Desc)
+	}
+	return tui.HelpBarStyle.Render(strings.Join(parts, " • "))
+}