feat(scheduler): Display-Zeitplan-Scheduler Package

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/backend/internal/scheduler/scheduler.go

@@ -0,0 +1,72 @@
+// Package scheduler enthält den Display-Zeitplan-Scheduler.
+// Er prüft jede Minute ob ein Screen ein- oder ausgeschaltet werden soll.
+package scheduler
+
+import (
+	"context"
+	"log/slog"
+	"time"
+
+	"git.az-it.net/az/morz-infoboard/server/backend/internal/store"
+)
+
+// DisplayCommander sendet einen Display-Befehl per MQTT.
+type DisplayCommander interface {
+	SendDisplayCommand(screenSlug, action string) error
+}
+
+// ScreenSlugGetter lädt den Slug für eine Screen-ID.
+type ScreenSlugGetter interface {
+	GetByID(ctx context.Context, id string) (*store.Screen, error)
+}
+
+// Run startet den Scheduler-Loop. Blockiert bis ctx abgebrochen wird.
+func Run(ctx context.Context, schedules *store.ScreenScheduleStore, screens ScreenSlugGetter, notifier DisplayCommander) {
+	ticker := time.NewTicker(1 * time.Minute)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ticker.C:
+			check(ctx, schedules, screens, notifier)
+		case <-ctx.Done():
+			return
+		}
+	}
+}
+
+// check prüft alle aktiven Zeitpläne und sendet ggf. Befehle.
+func check(ctx context.Context, schedules *store.ScreenScheduleStore, screens ScreenSlugGetter, notifier DisplayCommander) {
+	now := time.Now().Format("15:04")
+
+	enabled, err := schedules.ListEnabled(ctx)
+	if err != nil {
+		slog.Error("scheduler: list enabled schedules failed", "err", err)
+		return
+	}
+
+	for _, sc := range enabled {
+		screen, err := screens.GetByID(ctx, sc.ScreenID)
+		if err != nil {
+			slog.Warn("scheduler: screen not found", "screen_id", sc.ScreenID, "err", err)
+			continue
+		}
+
+		var action string
+		if sc.PowerOnTime != "" && sc.PowerOnTime == now {
+			action = "display_on"
+		} else if sc.PowerOffTime != "" && sc.PowerOffTime == now {
+			action = "display_off"
+		}
+
+		if action == "" {
+			continue
+		}
+
+		if err := notifier.SendDisplayCommand(screen.Slug, action); err != nil {
+			slog.Error("scheduler: send command failed", "screen_id", sc.ScreenID, "action", action, "err", err)
+		} else {
+			slog.Info("scheduler: display command sent", "screen_id", sc.ScreenID, "slug", screen.Slug, "action", action)
+		}
+	}
+}