package handlers_test

import (
	"strings"
	"testing"
	"time"

	"sneak.berlin/go/dnswatcher/internal/handlers"
)

func TestRelTime(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name string
		dur  time.Duration
		want string
	}{
		{"zero", 0, "never"},
		{"seconds", 30 * time.Second, "30s ago"},
		{"minutes", 5 * time.Minute, "5m ago"},
		{"hours", 2*time.Hour + 15*time.Minute, "2h 15m ago"},
		{"days", 48*time.Hour + 3*time.Hour, "2d 3h ago"},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			var input time.Time
			if tt.dur > 0 {
				input = time.Now().Add(-tt.dur)
			}

			got := handlers.RelTime(input)
			if got != tt.want {
				t.Errorf(
					"RelTime(%v) = %q, want %q",
					tt.dur, got, tt.want,
				)
			}
		})
	}
}

func TestExpiryDays(t *testing.T) {
	t.Parallel()

	// 10 days from now.
	future := time.Now().Add(10 * 24 * time.Hour)

	days := handlers.ExpiryDays(future)
	if days < 9 || days > 10 {
		t.Errorf("expected ~10 days, got %d", days)
	}

	// Already expired.
	past := time.Now().Add(-24 * time.Hour)

	days = handlers.ExpiryDays(past)
	if days != 0 {
		t.Errorf("expected 0 for expired, got %d", days)
	}
}

func TestFormatRecords(t *testing.T) {
	t.Parallel()

	got := handlers.FormatRecords(nil)
	if got != "-" {
		t.Errorf("expected -, got %q", got)
	}

	got = handlers.FormatRecords(map[string][]string{
		"A": {"1.2.3.4"},
	})

	if got != "A: 1.2.3.4" {
		t.Errorf("unexpected format: %q", got)
	}
}

// TestFormatRecordsTypeOrder checks that record types are listed in
// the README's order (A, AAAA, CNAME, MX, TXT, SRV, CAA, NS), with
// any other type after them in alphabetical order.
func TestFormatRecordsTypeOrder(t *testing.T) {
	t.Parallel()

	got := handlers.FormatRecords(map[string][]string{
		"SOA":   {"ns1.example.com. hostmaster.example.com. 1 2 3 4 5"},
		"NS":    {"ns1.example.com.", "ns2.example.com."},
		"CAA":   {`0 issue "letsencrypt.org"`},
		"DNAME": {"example.net."},
		"TXT":   {"v=spf1 -all"},
		"SRV":   {"10 5 443 www.example.com."},
		"MX":    {"10 mail.example.com."},
		"CNAME": {"www.example.com."},
		"AAAA":  {"2001:db8::1"},
		"A":     {"192.0.2.1"},
	})

	want := strings.Join([]string{
		"A: 192.0.2.1",
		"AAAA: 2001:db8::1",
		"CNAME: www.example.com.",
		"MX: 10 mail.example.com.",
		"TXT: v=spf1 -all",
		"SRV: 10 5 443 www.example.com.",
		`CAA: 0 issue "letsencrypt.org"`,
		"NS: ns1.example.com.",
		"NS: ns2.example.com.",
		"DNAME: example.net.",
		"SOA: ns1.example.com. hostmaster.example.com. 1 2 3 4 5",
	}, ", ")

	if got != want {
		t.Errorf("FormatRecords lists types out of order:\n got %q\nwant %q",
			got, want)
	}
}

// dashboardRow returns the table row of page that contains name.
func dashboardRow(t *testing.T, page string, name string) string {
	t.Helper()

	for row := range strings.SplitSeq(page, "<tr") {
		if strings.Contains(row, name) {
			return row
		}
	}

	t.Fatalf("dashboard has no row containing %q", name)

	return ""
}

// TestDashboardShowsFailureReasons checks that the dashboard shows the
// reason in the row of a failed nameserver and of a failed certificate,
// and not in the row of a nameserver that answered.
func TestDashboardShowsFailureReasons(t *testing.T) {
	t.Parallel()

	page := get(t, newHandlersWithFailures(t).HandleDashboard())

	if !strings.Contains(dashboardRow(t, page, failedNS), nsFailureReason) {
		t.Errorf("row of %s does not show %q", failedNS, nsFailureReason)
	}

	if strings.Contains(dashboardRow(t, page, answeringNS), nsFailureReason) {
		t.Errorf("row of %s shows %q", answeringNS, nsFailureReason)
	}

	if !strings.Contains(dashboardRow(t, page, certKey), certFailedReason) {
		t.Errorf("row of %s does not show %q", certKey, certFailedReason)
	}
}