79 lines
2.9 KiB
Dart
79 lines
2.9 KiB
Dart
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// 功能描述：定义用气统计的服务端事实模型；版本：1.0.0。
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class UsagePoint {
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const UsagePoint({required this.date, required this.usage});
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final DateTime date;
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final double usage;
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factory UsagePoint.fromJson(Map<String, Object?> json) => UsagePoint(
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date: DateTime.parse(json['date'] as String),
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usage: (json['usage'] as num).toDouble(),
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);
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}
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class UsageComposition {
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const UsageComposition({required this.breakfast, required this.lunch, required this.dinner});
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final double breakfast, lunch, dinner;
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factory UsageComposition.fromJson(Map<String, Object?> json) => UsageComposition(
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breakfast: (json['breakfast'] as num? ?? 0).toDouble(),
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lunch: (json['lunch'] as num? ?? 0).toDouble(),
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dinner: (json['dinner'] as num? ?? 0).toDouble(),
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);
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}
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class UsageStatistics {
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const UsageStatistics({
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required this.available,
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required this.deviceIdentity,
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required this.deviceName,
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required this.deviceCode,
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required this.period,
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required this.periodStart,
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required this.periodEnd,
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required this.unit,
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required this.points,
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required this.totalUsage,
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required this.averageUsage,
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required this.composition,
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required this.source,
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required this.calcVersion,
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required this.updatedAt,
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required this.unavailableReason,
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});
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final bool available;
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final String deviceIdentity, deviceName, deviceCode, period, unit;
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final DateTime periodStart, periodEnd;
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final List<UsagePoint> points;
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final double totalUsage, averageUsage;
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final UsageComposition composition;
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final String source, calcVersion, unavailableReason;
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final DateTime? updatedAt;
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factory UsageStatistics.fromJson(Map<String, Object?> json) {
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final device = json['device'] as Map<String, Object?>? ?? const {};
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final composition = json['composition'] as Map<String, Object?>? ?? const {};
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return UsageStatistics(
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available: json['available'] == true,
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deviceIdentity: device['identity'] as String? ?? '',
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deviceName: device['name'] as String? ?? '',
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deviceCode: device['code'] as String? ?? '',
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period: json['period'] as String? ?? 'month',
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periodStart: DateTime.parse(json['period_start'] as String),
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periodEnd: DateTime.parse(json['period_end'] as String),
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unit: json['unit'] as String? ?? 'kg',
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points: (json['points'] as List<Object?>? ?? const [])
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.map((item) => UsagePoint.fromJson(item as Map<String, Object?>))
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.toList(),
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totalUsage: (json['total_usage'] as num? ?? 0).toDouble(),
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averageUsage: (json['average_usage'] as num? ?? 0).toDouble(),
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composition: UsageComposition.fromJson(composition),
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source: json['source'] as String? ?? '',
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calcVersion: json['calc_version'] as String? ?? '',
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updatedAt: DateTime.tryParse(json['updated_at']?.toString() ?? '')?.toLocal(),
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unavailableReason: json['unavailable_reason'] as String? ?? '',
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);
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}
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}
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