package app

import (
	"fmt"
	"sort"
	"strings"

	"github.com/charmbracelet/lipgloss"
	"github.com/charmbracelet/x/ansi"
)

// center composites a modal over a scrim-filled screen. Immediate-mode: the modal
// is recomputed from state every frame, so there is no separate show/restore path
// to desync (the "diff won't come back" bug class can't occur here).
func (m Model) center(modal string) string {
	return lipgloss.Place(m.width, m.height, lipgloss.Center, lipgloss.Center, modal,
		lipgloss.WithWhitespaceBackground(m.theme.P.BgDeep),
		lipgloss.WithWhitespaceForeground(m.theme.P.BgDeep))
}

func (m Model) modalWidth() int {
	w := m.width * 70 / 100
	if m.narrow() {
		w = m.width - 4 // slim terminals: give modals nearly the whole screen
	}
	if w > 92 {
		w = 92
	}
	if w < 24 {
		w = 24
	}
	return w
}

// clip truncates a (possibly ANSI-styled) line to w visible columns so modal content
// never wraps mid-word on a slim terminal. ANSI-aware — won't slice escape codes.
func clip(s string, w int) string {
	if w < 1 {
		w = 1
	}
	return ansi.Truncate(s, w, "…")
}

func (m Model) renderOverlay(base string) string {
	switch m.overlay {
	case OverlayPalette:
		return m.center(m.paletteModal())
	case OverlayEventInspector:
		return m.center(m.eventInspectorModal())
	case OverlayDiff:
		return m.center(m.diffModal())
	case OverlayToolPalette:
		return m.center(m.toolPaletteModal())
	case OverlayModels:
		return m.center(m.modelsModal())
	case OverlayArtifacts:
		return m.center(m.artifactsModal())
	case OverlayConfig:
		return m.center(m.configModal())
	case OverlayStats:
		return m.center(m.statsModal())
	case OverlayIdeas:
		return m.center(m.ideasModal())
	case OverlayHealth:
		return m.center(m.healthModal())
	}
	return base
}

func (m Model) titleLine(text string) string {
	t := m.theme
	return lipgloss.NewStyle().Foreground(t.P.Accent).Background(t.P.BgPanel).Bold(true).Render(text)
}

func mbg(t Theme, s string, fg lipgloss.Color) string {
	return lipgloss.NewStyle().Foreground(fg).Background(t.P.BgPanel).Render(s)
}

// approvalBandHeight sizes the docked approval band to its diff, capped so it
// never crowds out the session above (longer diffs spill to the ^x fullscreen
// view). Layout: 2 borders + header + blank + diff rows + blank + action row.
func (m Model) approvalBandHeight() int {
	rows, rat := 0, 0
	if s := m.session(m.selectedID); s != nil && s.Pending != nil {
		rows = m.approvalContentRows(s.Pending)
		if n := len(s.Pending.Rationale); n > 0 {
			rat = n + 1 // rationale lines + trailing blank
		}
	}
	steer := 0
	if m.steering || m.steerBuffer != "" {
		steer = 1
	}
	h := 2 + 1 + 1 + rat + rows + 1 + steer + 1
	if maxH := m.height * 55 / 100; h > maxH {
		h = maxH
	}
	if h < 10 {
		h = 10
	}
	if hardMax := m.height - statusH - footerH - 3; hardMax > 4 && h > hardMax {
		h = hardMax
	}
	return h
}

// renderApprovalBand draws the approval gate as a full-width band (in place of
// the input bar): tool/tier/risk header, a two-column old|new diff, and the
// action row. It never floats over the rest of the UI.
func (m Model) renderApprovalBand(h int) string {
	t := m.theme
	s := m.session(m.selectedID)
	if s == nil || s.Pending == nil {
		return m.renderInput()
	}
	a := s.Pending
	textW := m.width - 4 // box borders (2) + side padding (2)

	riskColor := t.P.Warn
	switch strings.ToUpper(a.Risk) {
	case "HIGH", "CRITICAL":
		riskColor = t.P.Bad
	case "LOW":
		riskColor = t.P.OK
	}

	leftHdr := lipgloss.NewStyle().Foreground(t.P.Accent).Background(t.P.Bg).Bold(true).Render("→ ") +
		t.span(a.ToolName, t.P.FgStrong)
	if tgt := diffTarget(a.Preview); tgt != "" {
		leftHdr += t.span(" "+tgt, t.P.Dim)
	}
	rightHdr := t.span("tier ", t.P.Faint) + t.span(a.Tier, t.P.Accent2) +
		t.span("  ·  risk ", t.P.Faint) +
		lipgloss.NewStyle().Foreground(riskColor).Background(t.P.Bg).Bold(true).Render(strings.ToUpper(a.Risk))

	innerH := h - 2
	ratBlock := 0
	if len(a.Rationale) > 0 {
		ratBlock = len(a.Rationale) + 1 // rationale lines + trailing blank
	}
	steerBlock := 0
	if m.steering || m.steerBuffer != "" {
		steerBlock = 1
	}
	diffH := innerH - 4 - ratBlock - steerBlock // header, blank, blank, action row, + rationale/steer
	if diffH < 1 {
		diffH = 1
	}
	body := make([]string, 0, innerH)
	body = append(body, m.justify(leftHdr, rightHdr, textW, t.P.Bg), "")
	for _, r := range a.Rationale {
		marker := lipgloss.NewStyle().Foreground(t.P.Warn).Background(t.P.Bg).Render("▲ ")
		body = append(body, marker+t.span(truncate(r, textW-2), t.P.Dim))
	}
	if len(a.Rationale) > 0 {
		body = append(body, "")
	}
	var content []string
	switch {
	case isCommandApproval(a):
		content = m.commandCardLines(a, textW)
		if len(content) > diffH {
			content = content[:diffH]
		}
	case isUnifiedDiff(a.Preview):
		content = m.renderSplitDiff(parseUnifiedDiff(a.Preview), textW, diffH, 0)
	default:
		content = m.renderPreviewLines(a.Preview, textW, diffH, 0)
	}
	diffStart := len(body)
	body = append(body, content...)
	for len(body) < diffStart+diffH {
		body = append(body, "")
	}
	body = append(body, "")
	if steerBlock == 1 {
		body = append(body, m.steerLine())
	}
	body = append(body, m.approvalActions())
	return t.box("permission required", body, m.width, h, true)
}

// steerLine renders the steering note inside the band: editable (with a caret)
// while the operator is typing it, or as a persistent reminder once set — so it
// stays visible after editing and it's clear it rides along with approve/reject.
func (m Model) steerLine() string {
	t := m.theme
	label := t.span("steer  ", t.P.Faint)
	caret := lipgloss.NewStyle().Foreground(t.P.Accent).Background(t.P.Bg).Render("▏")
	if m.steering {
		if m.steerBuffer == "" {
			return label + caret + t.span(" type a note…", t.P.Faint)
		}
		return label + t.span(m.steerBuffer, t.P.FgStrong) + caret
	}
	return label + t.span(m.steerBuffer, t.P.Accent2) +
		t.span("   (sent with your decision · s to edit)", t.P.Faint)
}

// approvalActions renders the action row of the approval band. While the operator
// is composing a steer note the keys are different (typing is captured), so the
// hints switch to the editing controls.
func (m Model) approvalActions() string {
	t := m.theme
	hint := func(k, l string) string {
		return lipgloss.NewStyle().Foreground(t.P.Accent).Background(t.P.Bg).Bold(true).Render(k) +
			t.span(" "+l, t.P.Faint)
	}
	// Tighten the inter-hint gap on a slim terminal so the action row isn't clipped —
	// the approval card's decision keys must stay fully visible.
	gapStr := "   "
	if m.narrow() {
		gapStr = " "
	}
	gap := t.span(gapStr, t.P.Faint)
	if m.steering {
		return strings.Join([]string{
			hint("enter", "approve + send note"), hint("esc", "keep note, decide below"),
		}, gap)
	}
	parts := []string{hint("a", "approve"), hint("A", "auto"), hint("s", "steer"), hint("r", "reject")}
	if s := m.session(m.selectedID); s != nil && s.Pending != nil &&
		(isUnifiedDiff(s.Pending.Preview) || isCommandApproval(s.Pending)) {
		parts = append(parts, hint("^x", "fullscreen"))
	}
	parts = append(parts, hint("esc", "later"))
	return strings.Join(parts, gap)
}

// approvalContentRows is the number of body rows the pending approval's content
// occupies — command-card lines for a command, diff/preview rows otherwise. Drives
// band sizing so the height matches what renderApprovalBand will draw.
func (m Model) approvalContentRows(a *Approval) int {
	if isCommandApproval(a) {
		w := m.width - 4
		if w < 8 {
			w = 8
		}
		return len(m.commandCardLines(a, w))
	}
	return previewRowCount(a.Preview)
}

// diffBodyHeight is the number of diff lines visible in the diff modal body.
func (m Model) diffBodyHeight() int {
	h := m.height * 70 / 100
	if h < 8 {
		h = 8
	}
	return h - 6
}

// diffMaxScroll is the largest scroll offset that still fills the body with
// diff rows, keeping the last page anchored to the bottom of the modal.
func (m Model) diffMaxScroll() int {
	rows := previewRowCount(m.currentDiff())
	if cmd := m.pendingCommand(); cmd != nil {
		rows = len(m.commandCardLines(cmd, m.modalWidth()-6))
	}
	max := rows - m.diffBodyHeight()
	if max < 0 {
		max = 0
	}
	return max
}

func (m Model) diffModal() string {
	if cmd := m.pendingCommand(); cmd != nil {
		return m.commandModal(cmd)
	}
	t := m.theme
	w := m.modalWidth()
	bodyH := m.diffBodyHeight()
	diff := m.currentDiff()
	isDiff := isUnifiedDiff(diff)

	off := m.diffScrollOffset
	if off > m.diffMaxScroll() {
		off = m.diffMaxScroll()
	}
	if off < 0 {
		off = 0
	}

	var b strings.Builder
	title := "preview"
	if isDiff {
		title = "diff"
	}
	b.WriteString(m.titleLine(title))
	if tgt := diffTarget(diff); tgt != "" {
		b.WriteString(mbg(t, "  "+tgt, t.P.Dim))
	}
	b.WriteString(mbg(t, "   ("+itoa(previewRowCount(diff))+" rows)", t.P.Faint) + "\n\n")
	var lines []string
	if isDiff {
		lines = m.renderSplitDiff(parseUnifiedDiff(diff), w-6, bodyH, off)
	} else {
		lines = m.renderPreviewLines(diff, w-6, bodyH, off)
	}
	for _, ln := range lines {
		b.WriteString(ln + "\n")
	}
	b.WriteString("\n" + modalHints(t, [][2]string{{"↑↓", "scroll"}, {"^x/esc", "close"}}))

	modal := t.Overlay.Width(w).Render(b.String())
	return m.center(modal)
}

// commandModal is the ^x fullscreen view of a command approval: the same
// deterministic card as the band, scrollable, so a long command is fully readable
// without ever being truncated.
func (m Model) commandModal(a *Approval) string {
	t := m.theme
	w := m.modalWidth()
	bodyH := m.diffBodyHeight()
	lines := m.commandCardLines(a, w-6)

	off := m.diffScrollOffset
	if mx := m.diffMaxScroll(); off > mx {
		off = mx
	}
	if off < 0 {
		off = 0
	}

	var b strings.Builder
	b.WriteString(m.titleLine("command"))
	b.WriteString(mbg(t, "  "+a.ToolName, t.P.Dim))
	b.WriteString(mbg(t, "   ("+itoa(len(lines))+" rows)", t.P.Faint) + "\n\n")
	end := off + bodyH
	if end > len(lines) {
		end = len(lines)
	}
	for i := off; i < end; i++ {
		b.WriteString(lines[i] + "\n")
	}
	b.WriteString("\n" + modalHints(t, [][2]string{{"↑↓", "scroll"}, {"^x/esc", "close"}}))
	return m.center(t.Overlay.Width(w).Render(b.String()))
}

func (m Model) eventInspectorModal() string {
	t := m.theme
	w := m.modalWidth()
	evs := m.currentEvents()

	var b strings.Builder
	b.WriteString(m.titleLine("event inspector"))
	if len(evs) > 0 {
		b.WriteString(mbg(t, "   ("+itoa(m.overlayEventIdx+1)+"/"+itoa(len(evs))+")", t.P.Faint))
	}
	b.WriteString("\n\n")
	if len(evs) == 0 {
		b.WriteString(mbg(t, "no events", t.P.Faint))
		return m.center(t.Overlay.Width(w).Render(b.String()))
	}
	// Budget the plain detail so the styled row never needs ANSI-aware truncation
	// (truncating a styled string would cut through escape codes and corrupt it).
	detailBudget := (w - 6) - (2 + 9 + 11 + 1 + 18 + 1)
	if detailBudget < 4 {
		detailBudget = 4
	}
	// Window the (potentially long) list to a visible height, keeping the
	// selected row in view — the modal must not grow past the screen.
	bodyH := m.height*70/100 - 4
	if bodyH < 3 {
		bodyH = 3
	}
	off := 0
	if len(evs) > bodyH {
		off = m.overlayEventIdx - bodyH/2
		if off < 0 {
			off = 0
		}
		if off > len(evs)-bodyH {
			off = len(evs) - bodyH
		}
	}
	end := off + bodyH
	if end > len(evs) {
		end = len(evs)
	}
	for i := off; i < end; i++ {
		e := evs[i]
		cat := inferCategory(e.Type)
		marker := mbg(t, "  ", t.P.BgPanel)
		fg := t.P.Fg
		if i == m.overlayEventIdx {
			marker = lipgloss.NewStyle().Foreground(t.P.Accent).Background(t.P.BgPanel).Render("▸ ")
			fg = t.P.FgStrong
		}
		row := marker + mbg(t, padRaw(e.Time, 8)+" ", t.P.Faint) +
			lipgloss.NewStyle().Foreground(t.categoryColor(cat)).Background(t.P.BgPanel).Render(padRaw("["+cat+"]", 11)) + " " +
			lipgloss.NewStyle().Foreground(fg).Background(t.P.BgPanel).Render(padRaw(e.Type, 18)) +
			mbg(t, " "+truncate(e.Detail, detailBudget), t.P.Dim)
		b.WriteString(row + "\n")
	}
	b.WriteString("\n" + modalHints(t, [][2]string{{"↑↓", "select"}, {"esc", "close"}}))

	modal := t.Overlay.Width(w).Render(b.String())
	return m.center(modal)
}

func (m Model) paletteModal() string {
	t := m.theme
	w := m.modalWidth()
	cmds := m.filteredPalette()

	var b strings.Builder
	b.WriteString(m.titleLine("command palette") + "\n\n")

	// filter input line
	filter := m.paletteFilter
	caret := mbg(t, " ", t.P.BgPanel)
	if m.caretVisible() {
		caret = lipgloss.NewStyle().Foreground(t.P.Accent).Background(t.P.BgPanel).Render("▏")
	}
	prompt := lipgloss.NewStyle().Foreground(t.P.Accent).Background(t.P.BgPanel).Render("› ")
	if filter == "" {
		b.WriteString(prompt + caret + mbg(t, "type to filter…", t.P.Faint) + "\n\n")
	} else {
		b.WriteString(prompt + mbg(t, filter, t.P.FgStrong) + caret + "\n\n")
	}

	if len(cmds) == 0 {
		b.WriteString(mbg(t, "  no matching commands", t.P.Faint) + "\n")
	}
	for i, c := range cmds {
		marker := mbg(t, "  ", t.P.BgPanel)
		titleFg := t.P.Fg
		if i == m.paletteIndex {
			marker = lipgloss.NewStyle().Foreground(t.P.Accent).Background(t.P.BgPanel).Render("▌ ")
			titleFg = t.P.FgStrong
		}
		b.WriteString(marker +
			lipgloss.NewStyle().Foreground(titleFg).Background(t.P.BgPanel).Render(padRaw(c.title, 18)) +
			mbg(t, "  "+c.hint, t.P.Faint) + "\n")
	}
	b.WriteString("\n" + modalHints(t, [][2]string{{"↑↓", "select"}, {"enter", "run"}, {"esc", "close"}}))
	modal := t.Overlay.Width(w).Render(b.String())
	return m.center(modal)
}

func (m Model) toolPaletteModal() string {
	t := m.theme
	w := m.modalWidth()
	s := m.session(m.selectedID)

	var b strings.Builder
	b.WriteString(m.titleLine("tool palette") + "\n\n")
	if s == nil || len(s.ToolsByStage) == 0 {
		b.WriteString(mbg(t, "no tool manifest for this session", t.P.Faint) + "\n")
	} else {
		stages := make([]string, 0, len(s.ToolsByStage))
		for st := range s.ToolsByStage {
			stages = append(stages, st)
		}
		sort.Strings(stages)
		for _, st := range stages {
			label := mbg(t, st, t.P.Accent2)
			if st == s.CurrentStage {
				label += lipgloss.NewStyle().Foreground(t.P.Accent).Background(t.P.BgPanel).Render("  ◂ current")
			}
			b.WriteString(label + "\n")
			for _, tool := range s.ToolsByStage[st] {
				tier := lipgloss.NewStyle().Foreground(tierColor(t, tool.Tier)).Background(t.P.BgPanel).Render("T" + itoa(tool.Tier))
				b.WriteString(mbg(t, "    "+padRaw(tool.Name, 22), t.P.Fg) + tier + "\n")
			}
		}
	}
	b.WriteString("\n" + modalHints(t, [][2]string{{"t/esc", "close"}}))
	modal := t.Overlay.Width(w).Render(b.String())
	return m.center(modal)
}

func (m Model) modelsModal() string {
	t := m.theme
	w := m.modalWidth()

	var b strings.Builder
	b.WriteString(m.titleLine("models") + "\n\n")

	if g := m.gaugeText(); g != "" {
		b.WriteString(mbg(t, g, t.P.Faint) + "\n\n")
	}

	if len(m.availableModels) == 0 {
		b.WriteString(mbg(t, "  model management not enabled", t.P.Faint) + "\n")
	}
	for i, id := range m.availableModels {
		marker := mbg(t, "  ", t.P.BgPanel)
		nameFg := t.P.Fg
		if i == m.modelsIndex {
			marker = lipgloss.NewStyle().Foreground(t.P.Accent).Background(t.P.BgPanel).Render("▌ ")
			nameFg = t.P.FgStrong
		}
		line := marker + lipgloss.NewStyle().Foreground(nameFg).Background(t.P.BgPanel).Render(padRaw(id, 28))
		if id == m.currentModel {
			line += lipgloss.NewStyle().Foreground(t.P.Accent2).Background(t.P.BgPanel).Render("  ◂ resident")
		}
		b.WriteString(line + "\n")
	}
	b.WriteString("\n" + modalHints(t, [][2]string{{"↑↓", "select"}, {"enter", "swap"}, {"c", "clear pin"}, {"esc", "close"}}))
	modal := t.Overlay.Width(w).Render(b.String())
	return m.center(modal)
}

// artifactListRows is the number of artifact entries shown in the list portion of
// the viewer (the rest of the modal height goes to the selected artifact's content).
func (m Model) artifactListRows() int {
	n := len(m.artifacts)
	if n > 6 {
		n = 6
	}
	if n < 1 {
		n = 1
	}
	return n
}

// artifactContentBodyH is the number of content lines visible for the selected artifact.
func (m Model) artifactContentBodyH() int {
	h := m.height*70/100 - m.artifactListRows() - 7 // title, blanks, content header, hints
	if h < 3 {
		h = 3
	}
	return h
}

// artifactContentLines splits the selected artifact's content into display lines,
// wrapping each line to the specified width.
func (m Model) artifactContentLines(w int) []string {
	if m.artifactsIndex < 0 || m.artifactsIndex >= len(m.artifacts) {
		return nil
	}
	c := m.artifacts[m.artifactsIndex].Content
	if c == nil {
		return []string{"(no content stored)"}
	}
	lines := strings.Split(strings.ReplaceAll(*c, "\r\n", "\n"), "\n")
	return wrapLines(lines, w)
}

// artifactContentMaxScroll keeps the last page of content anchored to the body bottom.
func (m Model) artifactContentMaxScroll(w int) int {
	max := len(m.artifactContentLines(w)) - m.artifactContentBodyH()
	if max < 0 {
		max = 0
	}
	return max
}

func (m Model) artifactsModal() string {
	t := m.theme
	w := m.modalWidth()

	var b strings.Builder
	b.WriteString(m.titleLine("artifacts"))
	if len(m.artifacts) > 0 {
		b.WriteString(mbg(t, "   ("+itoa(m.artifactsIndex+1)+"/"+itoa(len(m.artifacts))+")", t.P.Faint))
	}
	b.WriteString("\n\n")

	if m.artifactsLoading {
		b.WriteString(mbg(t, "  loading…", t.P.Faint) + "\n")
		b.WriteString("\n" + modalHints(t, [][2]string{{"esc", "close"}}))
		return t.Overlay.Width(w).Render(b.String())
	}
	if len(m.artifacts) == 0 {
		b.WriteString(mbg(t, "  no artifacts for this session", t.P.Faint) + "\n")
		b.WriteString("\n" + modalHints(t, [][2]string{{"esc", "close"}}))
		return t.Overlay.Width(w).Render(b.String())
	}

	// Windowed artifact list, keeping the selected row in view.
	rows := m.artifactListRows()
	off := 0
	if len(m.artifacts) > rows {
		off = m.artifactsIndex - rows/2
		if off < 0 {
			off = 0
		}
		if off > len(m.artifacts)-rows {
			off = len(m.artifacts) - rows
		}
	}
	end := off + rows
	if end > len(m.artifacts) {
		end = len(m.artifacts)
	}
	for i := off; i < end; i++ {
		a := m.artifacts[i]
		marker := mbg(t, "  ", t.P.BgPanel)
		idFg := t.P.Fg
		if i == m.artifactsIndex {
			marker = lipgloss.NewStyle().Foreground(t.P.Accent).Background(t.P.BgPanel).Render("▸ ")
			idFg = t.P.FgStrong
		}
		row := marker +
			lipgloss.NewStyle().Foreground(idFg).Background(t.P.BgPanel).Render(padRaw(shortID(a.ArtifactID), 14)) + " " +
			mbg(t, padRaw(a.StageID, 18), t.P.Accent2) + " " +
			mbg(t, a.Phase, t.P.Faint)
		b.WriteString(row + "\n")
	}

	// Selected artifact content, scrollable with PgUp/PgDn.
	// Width available for content: w - 2 (left padding) - 2 (box borders) - 2 (right padding) = w - 6
	contentW := w - 6
	lines := m.artifactContentLines(contentW)
	bodyH := m.artifactContentBodyH()
	coff := m.artifactScroll
	if coff > m.artifactContentMaxScroll(contentW) {
		coff = m.artifactContentMaxScroll(contentW)
	}
	if coff < 0 {
		coff = 0
	}
	b.WriteString(mbg(t, "  ── content", t.P.Faint))
	if len(lines) > bodyH {
		b.WriteString(mbg(t, "  ("+itoa(coff+1)+"-"+itoa(min(coff+bodyH, len(lines)))+"/"+itoa(len(lines))+")", t.P.Faint))
	}
	b.WriteString("\n")
	cend := coff + bodyH
	if cend > len(lines) {
		cend = len(lines)
	}
	for i := coff; i < cend; i++ {
		b.WriteString(mbg(t, "  "+lines[i], t.P.Fg) + "\n")
	}

	b.WriteString("\n" + modalHints(t, [][2]string{{"↑↓", "select"}, {"PgUp/Dn", "scroll"}, {"v/esc", "close"}}))
	return t.Overlay.Width(w).Render(b.String())
}

// statsBreakdownRows caps how many per-provider / per-tool / per-tier rows the pane
// shows; the server already sorts each list by descending cost, so the cap keeps the
// heaviest contributors and the modal bounded.
const statsBreakdownRows = 6

// humanDurMs renders a millisecond span as a compact "1h 2m 3s" string.
func humanDurMs(ms int64) string {
	if ms <= 0 {
		return "0s"
	}
	total := ms / 1000
	h := total / 3600
	mn := (total / 60) % 60
	s := total % 60
	out := ""
	if h > 0 {
		out += itoa(int(h)) + "h "
	}
	if h > 0 || mn > 0 {
		out += itoa(int(mn)) + "m "
	}
	return out + itoa(int(s)) + "s"
}

func (m Model) statsModal() string {
	t := m.theme
	w := m.modalWidth()

	var b strings.Builder
	b.WriteString(m.titleLine("session stats"))
	if m.selectedID != "" {
		b.WriteString(mbg(t, "   ("+shortID(m.selectedID)+")", t.P.Faint))
	}
	b.WriteString("\n\n")

	if m.statsLoading || m.stats == nil || m.statsFor != m.selectedID {
		msg := "loading…"
		if !m.statsLoading && m.stats == nil {
			msg = "no stats for this session"
		}
		b.WriteString(mbg(t, "  "+msg, t.P.Faint) + "\n")
		b.WriteString("\n" + modalHints(t, [][2]string{{"S/esc", "close"}}))
		return t.Overlay.Width(w).Render(b.String())
	}

	s := m.stats
	cw := w - 4 // modal inner content width (borders + padding)
	section := func(label string) string {
		return lipgloss.NewStyle().Foreground(t.P.Accent2).Background(t.P.BgPanel).Bold(true).Render(label)
	}
	// put clips each data line to the inner width so it never wraps on a slim modal.
	put := func(styled string) { b.WriteString(clip(styled, cw) + "\n") }
	line := func(s string) string { return mbg(t, s, t.P.Fg) }
	faint := func(s string) string { return mbg(t, s, t.P.Faint) }
	// nameW shrinks the breakdown name column on slim terminals.
	nameW := 20
	if cw < 52 {
		nameW = 12
	}

	// header row: duration + event count
	put(faint("  duration ") + line(humanDurMs(s.SessionDurationMs)) +
		faint("    events ") + line(itoa(int(s.EventCount))))
	b.WriteString("\n")

	// inference
	b.WriteString(section("Inference") + "\n")
	put(line(fmt.Sprintf("  %d calls · %d+%d tok · %.1f tok/s",
		s.InferenceCount, s.PromptTokens, s.CompletionTokens, s.TokensPerSecond)))
	for i, p := range s.PerProvider {
		if i >= statsBreakdownRows {
			put(faint(fmt.Sprintf("    … +%d more", len(s.PerProvider)-statsBreakdownRows)))
			break
		}
		put(faint(fmt.Sprintf("    %-*s %d×  %d tok  %.1f t/s",
			nameW, padRaw(p.Provider, nameW), p.CompletedCount, p.PromptTokens+p.CompletionTokens, p.TokensPerSecond)))
	}
	b.WriteString("\n")

	// tools
	b.WriteString(section("Tools") + "\n")
	put(line(fmt.Sprintf("  %d calls · %d ms", s.ToolCount, s.ToolMs)))
	for i, tl := range s.PerTool {
		if i >= statsBreakdownRows {
			put(faint(fmt.Sprintf("    … +%d more", len(s.PerTool)-statsBreakdownRows)))
			break
		}
		put(faint(fmt.Sprintf("    %-*s %d×  %d ms", nameW, padRaw(tl.ToolName, nameW), tl.CompletedCount, tl.TotalDurationMs)))
	}
	b.WriteString("\n")

	// approvals
	b.WriteString(section("Approvals") + "\n")
	put(line(fmt.Sprintf("  %d req · %d res · %d pending · avg %d ms",
		s.ApprovalsRequested, s.ApprovalsResolved, s.ApprovalsPending, s.AvgApprovalWaitMs)))
	for _, tr := range s.PerTier {
		put(faint(fmt.Sprintf("    %-3s req %d  res %d  avg %d ms", tr.Tier, tr.RequestedCount, tr.ResolvedCount, tr.AvgWaitMs)))
	}
	b.WriteString("\n")

	// failures
	f := s.Failures
	b.WriteString(section("Failures") + "\n")
	put(line(fmt.Sprintf("  inf %d · t/o %d · tool %d · rej %d · stg %d · wf %d",
		f.InferenceFailures, f.InferenceTimeouts, f.ToolFailures, f.ToolRejections, f.StageFailures, f.WorkflowFailures)))
	b.WriteString("\n")

	// time accounting
	other := 100.0 - s.InferencePct - s.ToolPct - s.ApprovalWaitPct
	if other < 0 {
		other = 0
	}
	b.WriteString(section("Time") + "\n")
	put(line(fmt.Sprintf("  inf %.1f%% · tools %.1f%% · wait %.1f%% · other %.1f%%",
		s.InferencePct, s.ToolPct, s.ApprovalWaitPct, other)))

	b.WriteString("\n" + modalHints(t, [][2]string{{"S/esc", "close"}}))
	return t.Overlay.Width(w).Render(b.String())
}

func (m Model) healthModal() string {
	t := m.theme
	w := m.modalWidth()

	var b strings.Builder
	b.WriteString(m.titleLine("health checks"))
	b.WriteString("\n\n")

	if m.healthLoading || m.health == nil {
		msg := "loading…"
		if !m.healthLoading && m.health == nil {
			msg = "no health report available"
		}
		b.WriteString(mbg(t, "  "+msg, t.P.Faint) + "\n")
		b.WriteString("\n" + modalHints(t, [][2]string{{"H/esc", "close"}}))
		return t.Overlay.Width(w).Render(b.String())
	}

	h := m.health
	cw := w - 4

	// overall status header
	overallFg := t.P.OK
	if h.Overall == "DEGRADED" {
		overallFg = t.P.Bad
	}
	overall := lipgloss.NewStyle().Foreground(overallFg).Background(t.P.BgPanel).Bold(true).Render(h.Overall)
	b.WriteString(clip(mbg(t, "  overall  ", t.P.Faint)+overall+mbg(t, "    checked "+h.CheckedAt, t.P.Faint), cw) + "\n\n")

	if len(h.Subjects) == 0 {
		b.WriteString(mbg(t, "  no health probes recorded — health monitoring may be disabled", t.P.Faint) + "\n")
		b.WriteString("\n" + modalHints(t, [][2]string{{"H/esc", "close"}}))
		return t.Overlay.Width(w).Render(b.String())
	}

	section := func(label string) string {
		return lipgloss.NewStyle().Foreground(t.P.Accent2).Background(t.P.BgPanel).Bold(true).Render(label)
	}
	put := func(styled string) { b.WriteString(clip(styled, cw) + "\n") }
	faint := func(s string) string { return mbg(t, s, t.P.Faint) }

	for _, sub := range h.Subjects {
		statusFg := t.P.OK
		if sub.Status == "DEGRADED" {
			statusFg = t.P.Bad
		}
		statusLabel := lipgloss.NewStyle().Foreground(statusFg).Background(t.P.BgPanel).Bold(sub.Status == "DEGRADED").Render(sub.Status)
		b.WriteString(section(sub.Subject) + mbg(t, "  ", t.P.BgPanel) + statusLabel + "\n")
		put(faint(fmt.Sprintf("    metric %-18s value %d", sub.Metric, sub.ObservedValue)))
		if sub.Detail != "" {
			put(faint("    " + truncate(sub.Detail, cw-4)))
		}
		put(faint("    since  " + sub.Since))
		b.WriteString("\n")
	}

	b.WriteString(modalHints(t, [][2]string{{"H/esc", "close"}}))
	return t.Overlay.Width(w).Render(b.String())
}

// shortID trims a long artifact id for the list column while staying identifiable.
func shortID(id string) string {
	if len(id) <= 14 {
		return id
	}
	return id[:13] + "…"
}

func tierColor(t Theme, tier int) lipgloss.Color {
	switch {
	case tier >= 3:
		return t.P.Bad
	case tier == 2:
		return t.P.Warn
	case tier == 1:
		return t.P.Accent2
	default:
		return t.P.OK
	}
}

func modalHints(t Theme, pairs [][2]string) string {
	parts := make([]string, 0, len(pairs))
	for _, p := range pairs {
		parts = append(parts,
			lipgloss.NewStyle().Foreground(t.P.Accent).Background(t.P.BgPanel).Bold(true).Render(p[0])+
				mbg(t, " "+p[1], t.P.Faint))
	}
	return strings.Join(parts, mbg(t, "   ", t.P.Faint))
}

func truncate(s string, w int) string {
	if len([]rune(s)) <= w {
		return s
	}
	r := []rune(s)
	if w < 1 {
		return ""
	}
	return string(r[:w-1]) + "…"
}

// wrapLines wraps each line in the input slice to the specified width using hard rune-boundary wrapping.
func wrapLines(lines []string, w int) []string {
	if w < 1 {
		w = 1
	}
	var result []string
	for _, line := range lines {
		wrapped := wrapLine(line, w)
		result = append(result, wrapped...)
	}
	return result
}

// wrapLine wraps a single line to the specified width using hard rune-boundary wrapping.
func wrapLine(s string, w int) []string {
	if w < 1 {
		w = 1
	}
	runes := []rune(s)
	if len(runes) <= w {
		return []string{s}
	}
	var lines []string
	for len(runes) > 0 {
		if len(runes) <= w {
			lines = append(lines, string(runes))
			break
		}
		lines = append(lines, string(runes[:w]))
		runes = runes[w:]
	}
	return lines
}