import '../../../common/domain/metal_type.dart';

enum AssetCategory {
  bar('金条'),
  necklace('项链'),
  ring('戒指'),
  bracelet('手镯'),
  bean('金豆'),
  earring('耳环'),
  silverware('银饰'),
  platinumPiece('铂金件');

  const AssetCategory(this.label);

  final String label;
}

enum HoldingStatus { active, sold, gifted }

class GoldAssetHolding {
  const GoldAssetHolding({
    required this.id,
    required this.name,
    required this.metal,
    required this.category,
    required this.purity,
    required this.purityLabel,
    required this.weightGram,
    required this.createdAt,
    required this.updatedAt,
    this.costAmount,
    this.purchaseDate,
    this.channel,
    this.note,
    this.status = HoldingStatus.active,
  });

  final String id;
  final String name;
  final MetalType metal;
  final AssetCategory category;
  final double purity;
  final String purityLabel;
  final double weightGram;
  final double? costAmount;
  final DateTime? purchaseDate;
  final String? channel;
  final String? note;
  final DateTime createdAt;
  final DateTime updatedAt;
  final HoldingStatus status;

  double materialValue(double spotPrice) => weightGram * purity * spotPrice;

  Map<String, Object?> toJson() => {
    'id': id,
    'name': name,
    'metal': metal.name,
    'category': category.name,
    'purity': purity,
    'purityLabel': purityLabel,
    'weightGram': weightGram,
    'costAmount': costAmount,
    'purchaseDate': purchaseDate?.toIso8601String(),
    'channel': channel,
    'note': note,
    'createdAt': createdAt.toIso8601String(),
    'updatedAt': updatedAt.toIso8601String(),
    'status': status.name,
  };

  factory GoldAssetHolding.fromJson(Map<String, Object?> json) {
    return GoldAssetHolding(
      id: json['id']! as String,
      name: json['name']! as String,
      metal: MetalType.values.byName(json['metal']! as String),
      category: AssetCategory.values.byName(json['category']! as String),
      purity: (json['purity']! as num).toDouble(),
      purityLabel: json['purityLabel']! as String,
      weightGram: (json['weightGram']! as num).toDouble(),
      costAmount: (json['costAmount'] as num?)?.toDouble(),
      purchaseDate: switch (json['purchaseDate']) {
        final String value when value.isNotEmpty => DateTime.parse(value),
        _ => null,
      },
      channel: json['channel'] as String?,
      note: json['note'] as String?,
      createdAt: DateTime.parse(json['createdAt']! as String),
      updatedAt: DateTime.parse(json['updatedAt']! as String),
      status: HoldingStatus.values.byName(json['status']! as String),
    );
  }
}

class HoldingValuation {
  const HoldingValuation({
    required this.holding,
    required this.materialValue,
    required this.todayChange,
  });

  final GoldAssetHolding holding;
  final double materialValue;
  final double todayChange;
}

class MetalBreakdown {
  const MetalBreakdown({
    required this.metal,
    required this.value,
    required this.weightGram,
    required this.count,
  });

  final MetalType metal;
  final double value;
  final double weightGram;
  final int count;
}

class PortfolioSummary {
  const PortfolioSummary({
    required this.totalValue,
    required this.todayChangeAmount,
    required this.todayChangePercent,
    required this.totalCost,
    required this.totalWeightGram,
    required this.recycleReferenceValue,
    required this.breakdowns,
    required this.holdings,
  });

  final double totalValue;
  final double todayChangeAmount;
  final double todayChangePercent;
  final double totalCost;
  final double totalWeightGram;
  final double recycleReferenceValue;
  final List<MetalBreakdown> breakdowns;
  final List<HoldingValuation> holdings;
}