Add acknowledged alert history and HTML email digests

email.go

@@ -3,7 +3,9 @@ package main
 import (
 	"crypto/tls"
 	"fmt"
+	"html"
 	"log"
+	"mime"
 	"net"
 	"net/smtp"
 	"sort"
@@ -30,33 +32,36 @@ func filterEmailAlerts(alerts []Alert, settings EmailSettings) []Alert {
 
 func sendAlertEmail(settings EmailSettings, alerts []Alert, test bool) error {
 	subject := "Proxmox Dashboard: сводка уведомлений"
-	body := "Система не обнаружила выбранных активных событий."
+	body := `<div style="padding:32px;background:#0b1117;color:#edf3f7;font-family:Arial,sans-serif"><div style="max-width:680px;margin:auto"><div style="color:#55d58a;font-size:12px;letter-spacing:2px">PROXMOX DASHBOARD</div><h1 style="margin:10px 0 24px">Сводка событий</h1>`
 	if test {
 		subject = "Proxmox Dashboard: тест почты"
-		body = "Почтовые уведомления настроены правильно."
+		body += `<div style="padding:22px;border:1px solid #2b3944;border-radius:14px;background:#111a22"><b style="font-size:18px">Почта настроена</b><p style="color:#9aabb7;margin-bottom:0">Тестовое сообщение успешно отправлено вашим сервером.</p></div>`
 	}
 	if len(alerts) > 0 {
 		groups := map[string][]Alert{}
 		for _, alert := range alerts {
 			groups[alert.Severity] = append(groups[alert.Severity], alert)
 		}
-		var lines []string
+		var sections []string
 		for _, severity := range []string{"critical", "warning", "info"} {
 			items := groups[severity]
 			if len(items) == 0 {
 				continue
 			}
-			title := map[string]string{"critical": "КРИТИЧЕСКИЕ", "warning": "ПРЕДУПРЕЖДЕНИЯ", "info": "ИНФОРМАЦИЯ"}[severity]
-			lines = append(lines, title)
+			title := map[string]string{"critical": "Критические", "warning": "Предупреждения", "info": "Информация"}[severity]
+			color := map[string]string{"critical": "#ff665c", "warning": "#ffb35c", "info": "#6ba8ff"}[severity]
 			sort.Slice(items, func(i, j int) bool { return items[i].Title < items[j].Title })
+			cards := ""
 			for _, item := range items {
-				lines = append(lines, fmt.Sprintf("• [%s] %s\n  %s", item.Source, item.Title, item.Message))
+				cards += fmt.Sprintf(`<div style="margin:10px 0;padding:16px 18px;border:1px solid #2b3944;border-left:4px solid %s;border-radius:10px;background:#111a22"><div style="color:#8fa0ac;font-size:11px;text-transform:uppercase">%s</div><div style="font-weight:bold;font-size:16px;margin:5px 0">%s</div><div style="color:#aab7c0;font-size:14px">%s</div></div>`, color, html.EscapeString(item.Source), html.EscapeString(item.Title), html.EscapeString(item.Message))
 			}
+			sections = append(sections, fmt.Sprintf(`<h2 style="font-size:14px;color:%s;margin:24px 0 8px">%s · %d</h2>%s`, color, title, len(items), cards))
 		}
-		body = strings.Join(lines, "\n\n")
+		body += strings.Join(sections, "")
 		subject = fmt.Sprintf("Proxmox Dashboard: событий — %d", len(alerts))
 	}
-	message := []byte("From: " + settings.From + "\r\nTo: " + settings.To + "\r\nSubject: " + subject + "\r\nMIME-Version: 1.0\r\nContent-Type: text/plain; charset=UTF-8\r\nContent-Transfer-Encoding: 8bit\r\n\r\n" + body + "\r\n")
+	body += `<div style="color:#687985;font-size:12px;margin-top:28px">События собраны напрямую с Proxmox-хоста. Подтверждённые события повторно не отправляются.</div></div></div>`
+	message := []byte("From: " + settings.From + "\r\nTo: " + settings.To + "\r\nSubject: " + mime.QEncoding.Encode("UTF-8", subject) + "\r\nMIME-Version: 1.0\r\nContent-Type: text/html; charset=UTF-8\r\nContent-Transfer-Encoding: 8bit\r\n\r\n" + body + "\r\n")
 	address := net.JoinHostPort(settings.Host, fmt.Sprint(settings.Port))
 	tlsConfig := &tls.Config{ServerName: settings.Host, MinVersion: tls.VersionTLS12, InsecureSkipVerify: settings.SkipTLSVerify} //nolint:gosec -- explicit private-network option
 	var client *smtp.Client
@@ -114,11 +119,15 @@ func runEmailNotifier(collect func() (dashboardMetrics, error), store *Store) {
 		if !settings.Enabled || time.Since(store.LastEmailAt()) < time.Duration(settings.IntervalMinutes)*time.Minute {
 			continue
 		}
-		metrics, err := collect()
+		_, err := collect()
 		if err != nil {
 			continue
 		}
-		alerts := filterEmailAlerts(metrics.Alerts, settings)
+		pending, err := store.PendingEmailAlerts()
+		if err != nil {
+			continue
+		}
+		alerts := filterEmailAlerts(pending, settings)
 		if len(alerts) == 0 {
 			continue
 		}
@@ -126,6 +135,10 @@ func runEmailNotifier(collect func() (dashboardMetrics, error), store *Store) {
 			log.Printf("Не удалось отправить почтовую сводку: %v", err)
 			continue
 		}
+		if err := store.MarkAlertsEmailed(alerts); err != nil {
+			log.Printf("Не удалось отметить отправленные события: %v", err)
+			continue
+		}
 		store.SetLastEmailAt(time.Now())
 	}
 }