package templates

import (
	"context"
	"fmt"
	"strings"
	"testing"
	"time"

	"vetting/internal/model"
	"vetting/internal/store"
)

func TestHumanAgoFrom(t *testing.T) {
	now := time.Date(2026, 4, 17, 12, 0, 0, 0, time.UTC)
	cases := []struct {
		name string
		ago  time.Duration
		want string
	}{
		{"just now", 5 * time.Second, "online"},
		{"edge-just-under-minute", 59 * time.Second, "online"},
		{"one minute", 60 * time.Second, "1m ago"},
		{"five minutes", 5 * time.Minute, "5m ago"},
		{"fifty-nine minutes", 59 * time.Minute, "59m ago"},
		{"one hour", 1 * time.Hour, "1h ago"},
		{"eight hours", 8 * time.Hour, "8h ago"},
		{"one day", 24 * time.Hour, "1d ago"},
		{"three days", 72 * time.Hour, "3d ago"},
		// Clock skew: "future" heartbeat clamps to "online" rather than
		// printing "-3m ago" or panicking.
		{"future clamps to online", -5 * time.Second, "online"},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			got := humanAgoFrom(now, now.Add(-tc.ago))
			if got != tc.want {
				t.Fatalf("humanAgoFrom(%v) = %q, want %q", tc.ago, got, tc.want)
			}
		})
	}
}

// TestHostTile_OverlayLink asserts the tile includes the tile-link <a>
// that makes the whole card clickable. The action button stays a
// sibling element, so CSS (z-index) keeps it on top of the overlay.
//
// Heartbeat must be fresh because canStart now gates on LastSeenAt —
// an offline host renders a disabled button (no form), which is
// covered by TestHostTile_DisabledStartWhenOffline below.
func TestHostTile_OverlayLink(t *testing.T) {
	now := time.Now()
	data := TileData{
		Host:       model.Host{ID: 42, Name: "tile-test", MAC: "aa:bb:cc:dd:ee:ff"},
		LastSeenAt: &now,
	}
	var buf strings.Builder
	if err := HostTile(data).Render(context.Background(), &buf); err != nil {
		t.Fatalf("render: %v", err)
	}
	html := buf.String()
	if !strings.Contains(html, `href="/hosts/42"`) {
		t.Fatalf("tile missing overlay href: %s", html)
	}
	if !strings.Contains(html, `class="tile-link"`) {
		t.Fatalf("tile missing tile-link class: %s", html)
	}
	// Fresh heartbeat + no run → Start form must render.
	if !strings.Contains(html, `/hosts/42/start`) {
		t.Fatalf("expected Start vetting form in tile: %s", html)
	}
	// Dropped content that used to live on the tile — confirm it has
	// actually moved off so the slim-down is real.
	for _, dropped := range []string{`tile-meta`, `tile-log`, `tile-actions`, `tile-hold`} {
		if strings.Contains(html, dropped) {
			t.Errorf("slim tile still contains dropped class %q", dropped)
		}
	}
}

// TestHostTile_DisabledStartWhenOffline: no heartbeat → disabled button
// with the quick.sh tooltip, not a submittable form. Mirrors the
// server-side StartRun 409 so the UI matches the handler.
func TestHostTile_DisabledStartWhenOffline(t *testing.T) {
	data := TileData{
		Host: model.Host{ID: 42, Name: "tile-test", MAC: "aa:bb:cc:dd:ee:ff"},
	}
	var buf strings.Builder
	if err := HostTile(data).Render(context.Background(), &buf); err != nil {
		t.Fatalf("render: %v", err)
	}
	html := buf.String()
	if strings.Contains(html, `/hosts/42/start`) {
		t.Fatalf("offline host should not expose a Start form: %s", html)
	}
	if !strings.Contains(html, `disabled`) || !strings.Contains(html, `quick.sh`) {
		t.Fatalf("expected disabled Start button with quick.sh tooltip: %s", html)
	}
}

// TestHostTile_MiniRunView asserts the tile renders a step-list entry
// for every canonical stage, colours the dots according to the mixed
// stage states in the fixture, and surfaces the run id + duration in
// the meta row. This is the contract the dashboard leans on: the
// operator should be able to read run health across all tiles without
// drilling into any of them.
func TestHostTile_MiniRunView(t *testing.T) {
	now := time.Now()
	started := now.Add(-3 * time.Minute)
	latest := &model.Run{
		ID:        17,
		State:     model.StateSMART,
		StartedAt: started,
	}
	// Mixed states: first two stages passed, SMART running, rest pending.
	stages := []model.Stage{
		{Name: "Inventory", State: model.StagePassed},
		{Name: "SpecValidate", State: model.StagePassed},
		{Name: "SMART", State: model.StageRunning},
	}
	data := TileData{
		Host:       model.Host{ID: 42, Name: "tile-test", MAC: "aa:bb:cc:dd:ee:ff"},
		Latest:     latest,
		Stages:     stages,
		LastSeenAt: &now,
	}
	var buf strings.Builder
	if err := HostTile(data).Render(context.Background(), &buf); err != nil {
		t.Fatalf("render: %v", err)
	}
	html := buf.String()

	// Step list exists and contains every canonical stage name so the
	// operator reads a full 9-dot strip regardless of how far the run got.
	if !strings.Contains(html, `<ol class="tile-steplist">`) {
		t.Fatalf("tile missing step list: %s", html)
	}
	for _, s := range store.DefaultStageOrder {
		want := fmt.Sprintf(`<span class="tile-step-name">%s</span>`, s)
		if !strings.Contains(html, want) {
			t.Fatalf("tile missing step name %q: %s", s, html)
		}
	}
	// Colours: the two passed stages got passed dots; SMART got a running
	// dot; CPUStress (no fixture row) falls back to pending.
	mustContain := []string{
		`stage-dot stage-dot-sm stage-dot-passed`,
		`stage-dot stage-dot-sm stage-dot-running`,
		`stage-dot stage-dot-sm stage-dot-pending`,
	}
	for _, c := range mustContain {
		if !strings.Contains(html, c) {
			t.Fatalf("tile missing expected dot classes %q: %s", c, html)
		}
	}
	// Meta row: run id + a duration string (minutes for a 3m-old run).
	if !strings.Contains(html, `#17`) {
		t.Fatalf("tile missing run id #17: %s", html)
	}
	if !strings.Contains(html, `class="tile-run-duration"`) {
		t.Fatalf("tile missing duration element: %s", html)
	}
}

// TestHostTile_GhostSteplist: a never-run host still gets a 9-dot
// ghost strip (all pending). Keeps the tile height stable so the
// dashboard grid doesn't reflow as hosts gain their first run.
func TestHostTile_GhostSteplist(t *testing.T) {
	now := time.Now()
	data := TileData{
		Host:       model.Host{ID: 1, Name: "fresh", MAC: "aa:bb:cc:dd:ee:01"},
		LastSeenAt: &now,
	}
	var buf strings.Builder
	if err := HostTile(data).Render(context.Background(), &buf); err != nil {
		t.Fatalf("render: %v", err)
	}
	html := buf.String()
	for _, s := range store.DefaultStageOrder {
		want := fmt.Sprintf(`<span class="tile-step-name">%s</span>`, s)
		if !strings.Contains(html, want) {
			t.Fatalf("ghost tile missing stage %q: %s", s, html)
		}
	}
	if strings.Contains(html, `stage-dot-passed`) || strings.Contains(html, `stage-dot-running`) || strings.Contains(html, `stage-dot-failed`) {
		t.Fatalf("ghost tile should have only pending dots: %s", html)
	}
	// No run → no meta row (suppresses "#0 · 0s" when no run exists).
	if strings.Contains(html, `class="tile-run-id"`) {
		t.Fatalf("ghost tile should omit run id: %s", html)
	}
}

func TestLastSeenLabelAndClass(t *testing.T) {
	if got := lastSeenLabel(nil); got != "never" {
		t.Fatalf("label nil = %q, want never", got)
	}
	if got := lastSeenClass(nil); got != "offline" {
		t.Fatalf("class nil = %q, want offline", got)
	}
	recent := time.Now().Add(-5 * time.Second)
	if got := lastSeenClass(&recent); got != "online" {
		t.Fatalf("class recent = %q, want online", got)
	}
	stale := time.Now().Add(-10 * time.Minute)
	if got := lastSeenClass(&stale); got != "stale" {
		t.Fatalf("class stale = %q, want stale", got)
	}
}