chore: Initial commit

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XPovRHpejR4zRxuhjY4Qs3

lib/utils/drawing_message_parser.dart

@@ -0,0 +1,133 @@
+import 'dart:convert';
+
+import '../models/map_coordinate_space.dart';
+import '../models/map_drawing.dart';
+import 'custom_map_id.dart';
+
+class DrawingMessageParser {
+  static const String legacyPrefix = 'D:';
+  static const String customMapPrefix = 'D2:';
+
+  static bool isDrawingMessage(String text) {
+    return text.startsWith(legacyPrefix) || text.startsWith(customMapPrefix);
+  }
+
+  static MapDrawing? parseDrawingMessage(
+    String text, {
+    String? senderName,
+    String? messageId,
+  }) {
+    if (!isDrawingMessage(text)) {
+      return null;
+    }
+
+    try {
+      if (text.startsWith(customMapPrefix)) {
+        final json =
+            jsonDecode(text.substring(customMapPrefix.length))
+                as Map<String, dynamic>;
+        final mapId = normalizeCustomMapId(json['m'] as String?);
+        if (mapId == null || mapId.isEmpty) {
+          return null;
+        }
+        return MapDrawing.fromNetworkJson(
+          json,
+          senderName: senderName,
+          messageId: messageId,
+          coordinateSpace: MapCoordinateSpace.customMap,
+          mapId: mapId,
+        );
+      }
+
+      final json =
+          jsonDecode(text.substring(legacyPrefix.length))
+              as Map<String, dynamic>;
+      return MapDrawing.fromNetworkJson(
+        json,
+        senderName: senderName,
+        messageId: messageId,
+        coordinateSpace: MapCoordinateSpace.geo,
+      );
+    } catch (_) {
+      return null;
+    }
+  }
+
+  static String createDrawingMessage(MapDrawing drawing) {
+    final json = drawing.toNetworkJson();
+    final prefix = drawing.coordinateSpace == MapCoordinateSpace.customMap
+        ? customMapPrefix
+        : legacyPrefix;
+    return '$prefix${jsonEncode(json)}';
+  }
+
+  static String? getDrawingTypeDisplay(String text) {
+    final metadata = getDrawingMetadata(text);
+    return metadata?['type'] as String?;
+  }
+
+  static String? getColorName(String text) {
+    final metadata = getDrawingMetadata(text);
+    return metadata?['color'] as String?;
+  }
+
+  static Map<String, dynamic>? getDrawingMetadata(String text) {
+    if (!isDrawingMessage(text)) return null;
+
+    try {
+      final json =
+          jsonDecode(
+                text.startsWith(customMapPrefix)
+                    ? text.substring(customMapPrefix.length)
+                    : text.substring(legacyPrefix.length),
+              )
+              as Map<String, dynamic>;
+
+      final typeNum = json['t'] as int?;
+      final colorIndex = json['c'] as int?;
+      if (typeNum == null || colorIndex == null) return null;
+
+      String type;
+      int? pointCount;
+      switch (typeNum) {
+        case 0:
+          type = 'Line';
+          final points = json['p'] as List?;
+          pointCount = points != null ? points.length ~/ 2 : null;
+          break;
+        case 1:
+          type = 'Rectangle';
+          pointCount = 4;
+          break;
+        default:
+          return null;
+      }
+
+      const colorNames = [
+        'Red',
+        'Blue',
+        'Green',
+        'Yellow',
+        'Orange',
+        'Purple',
+        'Pink',
+        'Cyan',
+      ];
+      final color = colorIndex >= 0 && colorIndex < colorNames.length
+          ? colorNames[colorIndex]
+          : 'Unknown';
+
+      return {
+        'type': type,
+        'color': color,
+        'pointCount': pointCount,
+        'coordinateSpace': text.startsWith(customMapPrefix)
+            ? MapCoordinateSpace.customMap.name
+            : MapCoordinateSpace.geo.name,
+        'mapId': normalizeCustomMapId(json['m'] as String?),
+      };
+    } catch (_) {
+      return null;
+    }
+  }
+}