package watcher_test

import (
	"testing"

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

// When one nameserver's A record changes and its TXT record does not,
// the record change and the inconsistency it starts name the A record
// alone, with its values written as plain text.
func TestChangeMessagesNameTheChangedType(t *testing.T) {
	t.Parallel()

	// A nameserver's records: this A address and the same TXT record.
	records := func(address string) map[string][]string {
		return map[string][]string{
			"A":   {address},
			"TXT": {"v=spf1 -all"},
		}
	}

	before := hostnameState(map[string]map[string][]string{
		nsA: records(ip1),
		nsB: records(ip1),
	})
	after := hostnameState(map[string]map[string][]string{
		nsA: records(ip1),
		nsB: records(ip2),
	})

	// The hostname change detection uses only the notifier.
	notifier := &mockNotifier{}
	w := watcher.NewForTest(nil, nil, nil, nil, nil, notifier)

	w.DetectHostnameChanges(t.Context(), host, before, after)

	want := map[string]string{
		"Record Change: " + host: `Hostname: www.example.net
Nameserver: b.ns.example.net.
Type: A
Old: 192.0.2.1
New: 192.0.2.2`,
		"Inconsistency: " + host: `Hostname: www.example.net
Type: A
a.ns.example.net.: 192.0.2.1
b.ns.example.net.: 192.0.2.2`,
	}

	notifications := notifier.getNotifications()
	if len(notifications) != len(want) {
		t.Fatalf(
			"sent %d notifications, want %d: %v",
			len(notifications), len(want), notifications,
		)
	}

	for _, n := range notifications {
		if n.Message != want[n.Title] {
			t.Errorf(
				"%s message:\n%s\nwant:\n%s",
				n.Title, n.Message, want[n.Title],
			)
		}
	}
}