calculateTotal method

Implementation

DebtSummary calculateTotal(List<DebtItem> items) {
  var totalCost = 0.0;
  final byType = <DebtType, DebtTypeSummary>{};
  final bySeverity = <DebtSeverity, double>{};

  for (final item in items) {
    final cost = calculateItemCost(item);
    totalCost += cost;

    // Aggregate by type
    final typeSummary = byType[item.type] ??
        DebtTypeSummary(type: item.type, count: 0, cost: 0);
    byType[item.type] = DebtTypeSummary(
      type: item.type,
      count: typeSummary.count + 1,
      cost: typeSummary.cost + cost,
    );

    // Aggregate by severity
    bySeverity[item.severity] =
        (bySeverity[item.severity] ?? 0) + cost;
  }

  return DebtSummary(
    totalCost: totalCost,
    costByType: byType,
    costBySeverity: bySeverity,
    itemCount: items.length,
    unit: config.unit,
    threshold: config.threshold,
  );
}