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2026-10-04 00:19:45 +03:00
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+/// أنواع المقاطع المكتشفة تلقائياً
+enum SegmentType {
+  warmup,   // إحماء - أول 5-10% من المسافة بسرعة منخفضة
+  main,     // المرحلة الرئيسية
+  cooldown, // تبريد - آخر 5-10% بسرعة متناقصة
+  stop,     // نقطة توقف - سرعة < 0.3 m/s لأكثر من 10 ثوان
+  sprint,   // تسارع - سرعة > 120% من المتوسط
+  uphill,   // صعود - ارتفاع > 3% grade
+  downhill, // نزول - انخفاض > 3% grade
+}
+
+/// نموذج مقطع من المسار
+/// يمثل جزء من التمرين تم تقسيمه بناءً على تغيرات السرعة أو الارتفاع
+class WorkoutSegment {
+  final int segmentIndex;
+  final SegmentType type;
+  final double distanceMeters;
+  final int durationSeconds;
+  final double avgSpeedMps;
+  final double maxSpeedMps;
+  final double elevationChange; // positive = uphill, negative = downhill
+  final int startCoordIndex; // index in coordinates list
+  final int endCoordIndex;
+
+  WorkoutSegment({
+    required this.segmentIndex,
+    required this.type,
+    required this.distanceMeters,
+    required this.durationSeconds,
+    required this.avgSpeedMps,
+    this.maxSpeedMps = 0,
+    this.elevationChange = 0,
+    required this.startCoordIndex,
+    required this.endCoordIndex,
+  });
+
+  /// Pace in min/km
+  double get paceMinKm {
+    if (avgSpeedMps <= 0) return 0;
+    double kmh = avgSpeedMps * 3.6;
+    return kmh > 0 ? 60.0 / kmh : 0;
+  }
+
+  /// Gradient percentage (for elevation segments)
+  double get gradientPercent {
+    if (distanceMeters <= 0) return 0;
+    return (elevationChange / distanceMeters) * 100;
+  }
+
+  Map<String, dynamic> toMap() {
+    return {
+      'segment_index': segmentIndex,
+      'segment_type': type.name,
+      'distance_meters': distanceMeters,
+      'duration_seconds': durationSeconds,
+      'avg_speed_mps': avgSpeedMps,
+      'max_speed_mps': maxSpeedMps,
+      'elevation_change': elevationChange,
+      'start_coord_index': startCoordIndex,
+      'end_coord_index': endCoordIndex,
+    };
+  }
+
+  factory WorkoutSegment.fromMap(Map<String, dynamic> map) {
+    return WorkoutSegment(
+      segmentIndex: map['segment_index'] as int,
+      type: SegmentType.values.firstWhere(
+        (e) => e.name == map['segment_type'],
+        orElse: () => SegmentType.main,
+      ),
+      distanceMeters: (map['distance_meters'] as num).toDouble(),
+      durationSeconds: map['duration_seconds'] as int,
+      avgSpeedMps: (map['avg_speed_mps'] as num).toDouble(),
+      maxSpeedMps: (map['max_speed_mps'] as num?)?.toDouble() ?? 0,
+      elevationChange: (map['elevation_change'] as num?)?.toDouble() ?? 0,
+      startCoordIndex: map['start_coord_index'] as int,
+      endCoordIndex: map['end_coord_index'] as int,
+    );
+  }
+
+  /// Convert to API-compatible map
+  Map<String, dynamic> toApiMap() {
+    return {
+      'segment_order': segmentIndex,
+      'duration_seconds': durationSeconds,
+      'distance_meters': distanceMeters.toInt(),
+      'index_in_polyline': startCoordIndex,
+    };
+  }
+}