사용하지 않는 파일 정리 전 백업 (Phase 10 완료 후 상태)

lib/domain/entities/maintenance_schedule.dart

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+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'maintenance_schedule.freezed.dart';
+
+@freezed
+class MaintenanceSchedule with _$MaintenanceSchedule {
+  const MaintenanceSchedule._();
+  
+  const factory MaintenanceSchedule({
+    required int equipmentHistoryId,
+    required String maintenanceType,
+    required int periodMonths,
+    required DateTime startDate,
+    required DateTime endDate,
+    DateTime? lastMaintenanceDate,
+    DateTime? nextMaintenanceDate,
+    required double cost,
+    String? description,
+    @Default([]) List<DateTime> scheduledDates,
+    @Default(MaintenanceScheduleStatus.active) MaintenanceScheduleStatus status,
+  }) = _MaintenanceSchedule;
+  
+  // 다음 유지보수 날짜 계산
+  DateTime calculateNextMaintenanceDate() {
+    final lastDate = lastMaintenanceDate ?? startDate;
+    return lastDate.add(Duration(days: periodMonths * 30));
+  }
+  
+  // 남은 일수 계산
+  int getDaysUntilNextMaintenance() {
+    final next = nextMaintenanceDate ?? calculateNextMaintenanceDate();
+    return next.difference(DateTime.now()).inDays;
+  }
+  
+  // 만료 여부 확인
+  bool isOverdue() {
+    final daysUntil = getDaysUntilNextMaintenance();
+    return daysUntil < 0;
+  }
+  
+  // 곧 만료 예정 여부 확인 (30일 이내)
+  bool isUpcoming({int daysThreshold = 30}) {
+    final daysUntil = getDaysUntilNextMaintenance();
+    return daysUntil >= 0 && daysUntil <= daysThreshold;
+  }
+  
+  // 전체 스케줄 생성
+  List<DateTime> generateFullSchedule() {
+    final schedules = <DateTime>[];
+    var currentDate = startDate;
+    
+    while (currentDate.isBefore(endDate)) {
+      schedules.add(currentDate);
+      currentDate = currentDate.add(Duration(days: periodMonths * 30));
+    }
+    
+    return schedules;
+  }
+  
+  // 남은 유지보수 횟수 계산
+  int getRemainingMaintenanceCount() {
+    final now = DateTime.now();
+    final schedules = generateFullSchedule();
+    return schedules.where((date) => date.isAfter(now)).length;
+  }
+  
+  // 총 비용 계산
+  double getTotalCost() {
+    final totalCount = generateFullSchedule().length;
+    return cost * totalCount;
+  }
+  
+  // 남은 비용 계산
+  double getRemainingCost() {
+    return cost * getRemainingMaintenanceCount();
+  }
+}
+
+enum MaintenanceScheduleStatus {
+  active,   // 활성
+  paused,   // 일시중지
+  completed,// 완료
+  cancelled // 취소
+}
+
+// 유지보수 알림 설정
+@freezed
+class MaintenanceAlert with _$MaintenanceAlert {
+  const MaintenanceAlert._();
+  
+  const factory MaintenanceAlert({
+    required int maintenanceId,
+    required int equipmentHistoryId,
+    required String equipmentName,
+    required DateTime scheduledDate,
+    required String maintenanceType,
+    required int daysUntil,
+    required AlertPriority priority,
+    String? description,
+    double? estimatedCost,
+  }) = _MaintenanceAlert;
+  
+  // Backward compatibility getter
+  int get daysUntilDue => daysUntil;
+  
+  factory MaintenanceAlert.fromSchedule(
+    MaintenanceSchedule schedule,
+    String equipmentName,
+  ) {
+    final daysUntil = schedule.getDaysUntilNextMaintenance();
+    final priority = _getPriority(daysUntil);
+    
+    return MaintenanceAlert(
+      maintenanceId: 0, // Will be set from actual maintenance
+      equipmentHistoryId: schedule.equipmentHistoryId,
+      equipmentName: equipmentName,
+      scheduledDate: schedule.nextMaintenanceDate ?? schedule.calculateNextMaintenanceDate(),
+      maintenanceType: schedule.maintenanceType,
+      daysUntil: daysUntil,
+      priority: priority,
+      description: schedule.description,
+    );
+  }
+  
+  static AlertPriority _getPriority(int daysUntil) {
+    if (daysUntil < 0) return AlertPriority.critical;
+    if (daysUntil <= 7) return AlertPriority.high;
+    if (daysUntil <= 30) return AlertPriority.medium;
+    return AlertPriority.low;
+  }
+}
+
+enum AlertPriority {
+  critical, // 만료됨
+  high,     // 7일 이내
+  medium,   // 30일 이내
+  low       // 30일 초과
+}