init 1.0.0

2026-06-19 00:42:00 +02:00
commit 5ca960746b
67 changed files with 3261 additions and 0 deletions
@@ -0,0 +1,35 @@
+using LehrerApp.Sync.Models;
+
+namespace LehrerApp.Sync;
+
+/// <summary>
+/// Desktop gewinnt gegen Companion.
+/// Bei Gleichstand: späterer Timestamp gewinnt.
+/// </summary>
+public class ConflictResolver(EventQueue queue)
+{
+    public ConflictEntry? TryResolve(SyncEvent remote, string localDeviceId)
+    {
+        var local = queue.GetPending()
+            .FirstOrDefault(e => e.EntityType == remote.EntityType
+                              && e.EntityId   == remote.EntityId
+                              && e.DeviceId   != remote.DeviceId);
+        if (local is null) return null;
+
+        var winner = (local.DeviceType, remote.DeviceType) switch
+        {
+            (DeviceType.Desktop,   DeviceType.Companion) => local,
+            (DeviceType.Companion, DeviceType.Desktop)   => remote,
+            _ => local.Timestamp >= remote.Timestamp ? local : remote,
+        };
+
+        if (winner == remote) queue.Acknowledge([local.EventId]);
+
+        return new ConflictEntry
+        {
+            LocalEvent  = local,
+            RemoteEvent = remote,
+            Resolution  = winner == local ? "LocalWon" : "RemoteWon",
+        };
+    }
+}