feat: Stage 2 — alert dashboard with live table and stats

Adds a bubbles/table alert list showing Name, Status, Started (relative
time), and Ack By columns. Stats bar shows total/firing/resolved counts.
Filter cycles firing → resolved → all with [f]. Auto-refresh fires on
the configured interval via tea.Tick. Table scrolls with j/k.

internal/api/client.go

@@ -4,6 +4,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"net/url"
+	"strconv"
 	"strings"
 	"time"
 )
@@ -58,6 +60,38 @@ func (c *Client) do(req *http.Request, out any) error {
 	return nil
 }
 
+// ListAlerts fetches alerts from the server. status may be "firing", "resolved", or "" for all.
+func (c *Client) ListAlerts(status string, limit int) ([]Alert, error) {
+	q := url.Values{}
+	if status != "" {
+		q.Set("status", status)
+	}
+	if limit > 0 {
+		q.Set("limit", strconv.Itoa(limit))
+	}
+	path := "/api/alerts"
+	if len(q) > 0 {
+		path += "?" + q.Encode()
+	}
+
+	req, err := c.newRequest(http.MethodGet, path)
+	if err != nil {
+		return nil, err
+	}
+	var alerts []Alert
+	return alerts, c.do(req, &alerts)
+}
+
+// GetAlertStats fetches aggregate alert counts.
+func (c *Client) GetAlertStats() (*AlertStats, error) {
+	req, err := c.newRequest(http.MethodGet, "/api/stats/alerts")
+	if err != nil {
+		return nil, err
+	}
+	var stats AlertStats
+	return &stats, c.do(req, &stats)
+}
+
 // HealthCheck calls GET /healthz (unauthenticated path, no auth needed but we send it anyway).
 func (c *Client) HealthCheck() error {
 	req, err := http.NewRequest(http.MethodGet, c.baseURL+"/healthz", nil)

internal/api/types.go

@@ -0,0 +1,25 @@
+package api
+
+import "time"
+
+type Alert struct {
+	ID               int64             `json:"id"`
+	Fingerprint      string            `json:"fingerprint"`
+	Name             string            `json:"name"`
+	Status           string            `json:"status"`
+	Labels           map[string]string `json:"labels"`
+	Annotations      map[string]string `json:"annotations"`
+	StartsAt         time.Time         `json:"starts_at"`
+	EndsAt           *time.Time        `json:"ends_at"`
+	GeneratorURL     string            `json:"generator_url"`
+	ReceivedAt       time.Time         `json:"received_at"`
+	AcknowledgedByID *int64            `json:"acknowledged_by_id"`
+	AcknowledgedBy   string            `json:"acknowledged_by"`
+	AcknowledgedAt   *time.Time        `json:"acknowledged_at"`
+}
+
+type AlertStats struct {
+	Total    int `json:"total"`
+	Firing   int `json:"firing"`
+	Resolved int `json:"resolved"`
+}

internal/tui/model.go

@@ -1,10 +1,13 @@
 package tui
 
 import (
+	"fmt"
 	"time"
 
 	"github.com/charmbracelet/bubbles/help"
+	"github.com/charmbracelet/bubbles/table"
 	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
 	"github.com/yeniklas/terdut-tui/internal/api"
 )
 
@@ -16,19 +19,13 @@ const (
 	sectionUsers
 )
 
-type mode int
-
-const (
-	modeDashboard mode = iota
-	modeDetail
-	modeSchedule
-	modeUsers
-)
-
 // tea.Msg types
 
-type connectedMsg struct{ serverURL string }
+type connectedMsg struct{}
 type connectErrMsg struct{ err error }
+type alertsFetchedMsg struct{ alerts []api.Alert }
+type statsFetchedMsg struct{ stats api.AlertStats }
+type fetchDataErrMsg struct{ err error }
 type tickMsg time.Time
 type clearStatusMsg struct{}
 
@@ -39,25 +36,41 @@ type Model struct {
 	refreshInterval time.Duration
 
 	activeSection section
-	mode          mode
 	width         int
 	height        int
 
 	connected    bool
+	loading      bool
 	err          error
 	statusMsg    string
 
+	alerts       []api.Alert
+	stats        *api.AlertStats
+	filterStatus string // "firing", "resolved", or "" (all)
+
+	alertTable table.Model
 	help       help.Model
 	keys       keyMap
 }
 
 func NewModel(client *api.Client, serverURL string, refreshInterval time.Duration) Model {
+	t := table.New(table.WithFocused(true))
+	s := table.DefaultStyles()
+	s.Header = s.Header.Bold(true)
+	s.Selected = s.Selected.
+		Foreground(lipgloss.Color("0")).
+		Background(colorPrimary).
+		Bold(true)
+	t.SetStyles(s)
+
 	return Model{
 		client:          client,
 		serverURL:       serverURL,
 		refreshInterval: refreshInterval,
 		activeSection:   sectionAlerts,
-		mode:            modeDashboard,
+		loading:         true,
+		filterStatus:    "firing",
+		alertTable:      t,
 		help:            help.New(),
 		keys:            keys,
 	}
@@ -67,6 +80,73 @@ func (m Model) Init() tea.Cmd {
 	return connectCmd(m.client)
 }
 
+// rebuildTable updates the alert table columns, rows, and height to match current state.
+func (m *Model) rebuildTable() {
+	m.alertTable.SetColumns(alertColumns(m.width))
+	m.alertTable.SetRows(alertRows(m.alerts))
+	h := m.height - 8 // header + tabs + sep + stats + table-header + footer + 2 margins
+	if h < 1 {
+		h = 1
+	}
+	m.alertTable.SetHeight(h)
+}
+
+func alertColumns(width int) []table.Column {
+	nameW := width/2 - 8
+	if nameW < 20 {
+		nameW = 20
+	}
+	ackW := width - nameW - 10 - 12 - 6
+	if ackW < 8 {
+		ackW = 8
+	}
+	return []table.Column{
+		{Title: "Name", Width: nameW},
+		{Title: "Status", Width: 10},
+		{Title: "Started", Width: 12},
+		{Title: "Ack By", Width: ackW},
+	}
+}
+
+func alertRows(alerts []api.Alert) []table.Row {
+	now := time.Now()
+	rows := make([]table.Row, len(alerts))
+	for i, a := range alerts {
+		ack := a.AcknowledgedBy
+		rows[i] = table.Row{a.Name, a.Status, humanAgo(now, a.StartsAt), ack}
+	}
+	return rows
+}
+
+func humanAgo(now, t time.Time) string {
+	d := now.Sub(t)
+	if d < 0 {
+		d = 0
+	}
+	switch {
+	case d < time.Minute:
+		return "just now"
+	case d < time.Hour:
+		return fmt.Sprintf("%dm ago", int(d.Minutes()))
+	case d < 24*time.Hour:
+		h := int(d.Hours())
+		m := int(d.Minutes()) % 60
+		if m == 0 {
+			return fmt.Sprintf("%dh ago", h)
+		}
+		return fmt.Sprintf("%dh %dm ago", h, m)
+	default:
+		days := int(d.Hours()) / 24
+		h := int(d.Hours()) % 24
+		if h == 0 {
+			return fmt.Sprintf("%dd ago", days)
+		}
+		return fmt.Sprintf("%dd %dh ago", days, h)
+	}
+}
+
+// Command constructors
+
 func connectCmd(client *api.Client) tea.Cmd {
 	return func() tea.Msg {
 		if err := client.HealthCheck(); err != nil {
@@ -76,6 +156,26 @@ func connectCmd(client *api.Client) tea.Cmd {
 	}
 }
 
+func fetchAlertsCmd(client *api.Client, status string) tea.Cmd {
+	return func() tea.Msg {
+		alerts, err := client.ListAlerts(status, 500)
+		if err != nil {
+			return fetchDataErrMsg{err}
+		}
+		return alertsFetchedMsg{alerts}
+	}
+}
+
+func fetchStatsCmd(client *api.Client) tea.Cmd {
+	return func() tea.Msg {
+		stats, err := client.GetAlertStats()
+		if err != nil {
+			return fetchDataErrMsg{err}
+		}
+		return statsFetchedMsg{*stats}
+	}
+}
+
 func tickCmd(interval time.Duration) tea.Cmd {
 	return tea.Tick(interval, func(t time.Time) tea.Msg {
 		return tickMsg(t)

internal/tui/update.go

@@ -9,27 +9,55 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	case tea.WindowSizeMsg:
 		m.width = msg.Width
 		m.height = msg.Height
+		m.rebuildTable()
 		return m, nil
 
 	case connectedMsg:
 		m.connected = true
 		m.err = nil
-		m.statusMsg = "Connected to " + m.serverURL
+		return m, tea.Batch(
-		return m, tea.Batch(tickCmd(m.refreshInterval), clearStatusCmd())
+			tickCmd(m.refreshInterval),
+			fetchAlertsCmd(m.client, m.filterStatus),
+			fetchStatsCmd(m.client),
+		)
 
 	case connectErrMsg:
 		m.connected = false
 		m.err = msg.err
 		return m, nil
 
+	case alertsFetchedMsg:
+		m.alerts = msg.alerts
+		m.loading = false
+		m.rebuildTable()
+		return m, nil
+
+	case statsFetchedMsg:
+		m.stats = &msg.stats
+		return m, nil
+
+	case fetchDataErrMsg:
+		m.statusMsg = "error: " + msg.err.Error()
+		return m, clearStatusCmd()
+
 	case tickMsg:
-		return m, tickCmd(m.refreshInterval)
+		return m, tea.Batch(
+			tickCmd(m.refreshInterval),
+			fetchAlertsCmd(m.client, m.filterStatus),
+			fetchStatsCmd(m.client),
+		)
 
 	case clearStatusMsg:
 		m.statusMsg = ""
 		return m, nil
 
 	case tea.KeyMsg:
+		if m.activeSection == sectionAlerts && m.connected {
+			var tableCmd tea.Cmd
+			m.alertTable, tableCmd = m.alertTable.Update(msg)
+			m2, ourCmd := m.handleKey(msg)
+			return m2, tea.Batch(tableCmd, ourCmd)
+		}
 		return m.handleKey(msg)
 	}
 
@@ -37,17 +65,39 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 }
 
 func (m Model) handleKey(msg tea.KeyMsg) (Model, tea.Cmd) {
-	switch {
+	switch msg.String() {
-	case msg.String() == "q" || msg.String() == "ctrl+c":
+	case "q", "ctrl+c":
 		return m, tea.Quit
 
-	case msg.String() == "tab":
+	case "tab":
 		m.activeSection = (m.activeSection + 1) % 3
 		return m, nil
 
-	case msg.String() == "r":
+	case "r":
+		if !m.connected {
+			return m, connectCmd(m.client)
+		}
 		m.statusMsg = "Refreshing…"
-		return m, tea.Batch(connectCmd(m.client), clearStatusCmd())
+		return m, tea.Batch(
+			fetchAlertsCmd(m.client, m.filterStatus),
+			fetchStatsCmd(m.client),
+			clearStatusCmd(),
+		)
+
+	case "f":
+		if m.activeSection != sectionAlerts || !m.connected {
+			return m, nil
+		}
+		switch m.filterStatus {
+		case "firing":
+			m.filterStatus = "resolved"
+		case "resolved":
+			m.filterStatus = ""
+		default:
+			m.filterStatus = "firing"
+		}
+		m.loading = true
+		return m, fetchAlertsCmd(m.client, m.filterStatus)
 	}
 
 	return m, nil

internal/tui/view.go

@@ -24,11 +24,7 @@ func (m Model) View() string {
 
 func (m Model) renderHeader() string {
 	title := styleHeader.Render("terdut-tui")
-	right := ""
+	right := styleMuted.Render(m.serverURL)
-	if m.serverURL != "" {
-		right = styleMuted.Render(m.serverURL)
-	}
-
 	gap := m.width - lipgloss.Width(title) - lipgloss.Width(right)
 	if gap < 0 {
 		gap = 0
@@ -45,43 +41,83 @@ func (m Model) renderTabs() string {
 			tabs = append(tabs, styleTabInactive.Render(name))
 		}
 	}
-	line := strings.Repeat("─", m.width)
+	sep := styleMuted.Render(strings.Repeat("─", m.width))
-	return strings.Join(tabs, "") + "\n" + styleMuted.Render(line)
+	return strings.Join(tabs, "") + "\n" + sep
 }
 
 func (m Model) renderBody() string {
-	bodyHeight := m.height - 5 // header + tabs + separator + footer + help
+	if m.err != nil {
-	if bodyHeight < 1 {
+		return "\n" + styleError.Render(fmt.Sprintf("  Error: %v", m.err)) +
-		bodyHeight = 1
+			"\n" + styleMuted.Render("  Press r to retry.")
+	}
+	if !m.connected {
+		return "\n" + styleMuted.Render("  Connecting…")
 	}
 
-	var content string
-	if m.err != nil {
-		content = styleError.Render(fmt.Sprintf("Error: %v", m.err))
-	} else if !m.connected {
-		content = styleMuted.Render("Connecting…")
-	} else if m.statusMsg != "" {
-		content = styleStatus.Render(m.statusMsg)
-	} else {
 	switch m.activeSection {
 	case sectionAlerts:
-			content = styleMuted.Render("Alert dashboard — coming in Stage 2")
+		return m.renderAlerts()
 	case sectionSchedule:
-			content = styleMuted.Render("On-call schedule — coming in Stage 4")
+		return "\n" + styleMuted.Render("  On-call schedule — coming in Stage 4")
 	case sectionUsers:
-			content = styleMuted.Render("User management — coming in Stage 5")
+		return "\n" + styleMuted.Render("  User management — coming in Stage 5")
 	}
+	return ""
 }
 
-	lines := strings.Split(content, "\n")
+func (m Model) renderAlerts() string {
-	padding := (bodyHeight - len(lines)) / 2
+	statsBar := m.renderStatsBar()
-	if padding < 0 {
+	var content string
-		padding = 0
+	if m.loading && len(m.alerts) == 0 {
+		content = styleMuted.Render("  Loading alerts…")
+	} else if len(m.alerts) == 0 {
+		label := m.filterStatus
+		if label == "" {
+			label = "all"
 		}
-	return strings.Repeat("\n", padding) + content
+		content = styleMuted.Render(fmt.Sprintf("  No %s alerts.", label))
+	} else {
+		content = m.alertTable.View()
+	}
+	return lipgloss.JoinVertical(lipgloss.Left, statsBar, content)
+}
+
+func (m Model) renderStatsBar() string {
+	total, firing, resolved := 0, 0, 0
+	if m.stats != nil {
+		total = m.stats.Total
+		firing = m.stats.Firing
+		resolved = m.stats.Resolved
+	}
+
+	filterLabel := m.filterStatus
+	if filterLabel == "" {
+		filterLabel = "all"
+	}
+
+	left := fmt.Sprintf("  Total: %d  %s  %s",
+		total,
+		styleFiring.Render(fmt.Sprintf("Firing: %d", firing)),
+		styleResolved.Render(fmt.Sprintf("Resolved: %d", resolved)),
+	)
+	right := styleMuted.Render(fmt.Sprintf("filter: %s  [f]  ", filterLabel))
+
+	gap := m.width - lipgloss.Width(left) - lipgloss.Width(right)
+	if gap < 0 {
+		gap = 0
+	}
+	return left + strings.Repeat(" ", gap) + right
 }
 
 func (m Model) renderFooter() string {
-	helpView := m.help.ShortHelpView(m.keys.ShortHelp())
+	helpView := styleFooter.Render(m.help.ShortHelpView(m.keys.ShortHelp()))
-	return "\n" + styleFooter.Render(helpView)
+	if m.statusMsg != "" {
+		status := styleStatus.Render(m.statusMsg)
+		gap := m.width - lipgloss.Width(status) - lipgloss.Width(helpView)
+		if gap < 0 {
+			gap = 0
+		}
+		return "\n" + status + strings.Repeat(" ", gap) + helpView
+	}
+	return "\n" + helpView
 }