feat: add alot

lib/models/remote_command.dart

@@ -1,6 +1,25 @@
+import '../utils/app_config.dart';
+
+enum CommandType {
+  closeTab('close_tab');
+
+  final String value;
+
+  const CommandType(this.value);
+
+  static CommandType? fromValue(String value) {
+    for (final type in CommandType.values) {
+      if (type.value == value) return type;
+    }
+    return null;
+  }
+}
+
+enum CommandResult { completed, conflict, failed, expired }
+
 class RemoteCommand {
   final String id;
-  final String type;
+  final String rawType;
   final String tabId;
   final int expectedVersion;
   final String paymentMethod;
@@ -9,7 +28,7 @@ class RemoteCommand {
 
   const RemoteCommand({
     required this.id,
-    required this.type,
+    required this.rawType,
     required this.tabId,
     required this.expectedVersion,
     required this.paymentMethod,
@@ -20,7 +39,7 @@ class RemoteCommand {
   factory RemoteCommand.fromJson(Map<String, dynamic> json) {
     return RemoteCommand(
       id: json['id'] as String,
-      type: json['type'] as String,
+      rawType: json['type'] as String,
       tabId: json['tabId'] as String,
       expectedVersion: json['expectedVersion'] as int,
       paymentMethod: json['paymentMethod'] as String? ?? 'cash',
@@ -29,8 +48,13 @@ class RemoteCommand {
     );
   }
 
+  /// Null when the server sends a command this app version doesn't know.
+  CommandType? get type => CommandType.fromValue(rawType);
+
   bool get isExpired {
-    final cutoff = DateTime.now().subtract(const Duration(hours: 24));
+    final cutoff = DateTime.now().subtract(
+      const Duration(hours: kCommandExpiryHours),
+    );
     return createdAt.isBefore(cutoff);
   }
 }
@@ -40,24 +64,23 @@ class SyncResponse {
   final String? cursor;
   final List<String> plannedTabNames;
 
-  SyncResponse({
+  const SyncResponse({
     required this.commands,
     this.cursor,
     this.plannedTabNames = const [],
   });
 
   factory SyncResponse.fromJson(Map<String, dynamic> json) {
-    final commandsList = (json['commands'] as List<dynamic>?)
-            ?.map((e) => RemoteCommand.fromJson(e as Map<String, dynamic>))
-            .toList() ??
-        [];
     return SyncResponse(
-      commands: commandsList,
+      commands: [
+        for (final command in json['commands'] as List<dynamic>? ?? [])
+          RemoteCommand.fromJson(command as Map<String, dynamic>),
+      ],
       cursor: json['cursor'] as String?,
-      plannedTabNames: (json['plannedTabNames'] as List<dynamic>?)
-              ?.map((e) => e as String)
-              .toList() ??
-          [],
+      plannedTabNames: [
+        for (final name in json['plannedTabNames'] as List<dynamic>? ?? [])
+          name as String,
+      ],
     );
   }
 }
@@ -78,12 +101,12 @@ class SnapshotTab {
   });
 
   Map<String, dynamic> toJson() => {
-        'id': id,
-        'customerName': customerName,
-        'version': version,
-        'totalInCents': totalInCents,
-        'itemCount': itemCount,
-      };
+    'id': id,
+    'customerName': customerName,
+    'version': version,
+    'totalInCents': totalInCents,
+    'itemCount': itemCount,
+  };
 }
 
 class SyncRequest {
@@ -98,15 +121,15 @@ class SyncRequest {
   });
 
   Map<String, dynamic> toJson() => {
-        'deviceId': deviceId,
-        if (cursor != null) 'cursor': cursor,
-        'openTabs': openTabs.map((t) => t.toJson()).toList(),
-      };
+    'deviceId': deviceId,
+    if (cursor != null) 'cursor': cursor,
+    'openTabs': openTabs.map((tab) => tab.toJson()).toList(),
+  };
 }
 
 class CommandAck {
   final String commandId;
-  final String status;
+  final CommandResult status;
   final String? result;
 
   const CommandAck({
@@ -116,10 +139,10 @@ class CommandAck {
   });
 
   Map<String, dynamic> toJson() => {
-        'commandId': commandId,
-        'status': status,
-        if (result != null) 'result': result,
-      };
+    'commandId': commandId,
+    'status': status.name,
+    if (result != null) 'result': result,
+  };
 }
 
 enum RemoteSyncEventType {
@@ -127,6 +150,7 @@ enum RemoteSyncEventType {
   syncCompleted,
   syncFailed,
   conflict,
+  unauthorized,
 }
 
 class RemoteSyncEvent {
@@ -141,4 +165,4 @@ class RemoteSyncEvent {
     this.requestedBy,
     this.message,
   });
-}
+}