package notify_test

import (
	"testing"
	"time"

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

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

	h := notify.NewAlertHistory()

	entries := h.Recent()
	if len(entries) != 0 {
		t.Fatalf("expected 0 entries, got %d", len(entries))
	}
}

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

	h := notify.NewAlertHistory()

	now := time.Now().UTC()

	h.Add(notify.AlertEntry{
		Timestamp: now.Add(-2 * time.Minute),
		Title:     "first",
		Message:   "msg1",
		Priority:  "info",
	})

	h.Add(notify.AlertEntry{
		Timestamp: now.Add(-1 * time.Minute),
		Title:     "second",
		Message:   "msg2",
		Priority:  "warning",
	})

	entries := h.Recent()
	if len(entries) != 2 {
		t.Fatalf("expected 2 entries, got %d", len(entries))
	}

	// Newest first.
	if entries[0].Title != "second" {
		t.Errorf(
			"expected newest first, got %q", entries[0].Title,
		)
	}

	if entries[1].Title != "first" {
		t.Errorf(
			"expected oldest second, got %q", entries[1].Title,
		)
	}
}

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

	h := notify.NewAlertHistory()

	const totalEntries = 110

	// Fill beyond capacity.
	for i := range totalEntries {
		h.Add(notify.AlertEntry{
			Timestamp: time.Now().UTC(),
			Title:     "alert",
			Message:   "msg",
			Priority:  string(rune('0' + i%10)),
		})
	}

	entries := h.Recent()

	const maxHistory = 100

	if len(entries) != maxHistory {
		t.Fatalf(
			"expected %d entries, got %d",
			maxHistory, len(entries),
		)
	}
}