module plus.models.common;
import std.datetime;

enum InterpolationType {
  Linear,
  Step,
  Cubic
}
enum PaymentFrequencyType {
  Monthly,
  Annual,
  Semiannual,
  Once
}
struct DateRange {
  Date start;
  Date end;
}

struct DateValue {
  Date date;
  double value = 0.0;
}

struct AcquiredRetired {
  Date acquired;
  Date retired;
}

struct Point {
  double x = 0.0;
  double y = 0.0;
}

struct QuantityBin {
  InterpolationType interpolationType;
  immutable(Point)[] data;
}

struct RateCurve {
  immutable(DateValue)[] curveData;
}

struct CFlowSequenceSpec {
  Date startDate;
  Date endDate;
  PaymentFrequencyType paymentFrequencyType;
  double value = 0.0;
  double growthRate = 0.0;
  RateCurve growthCurve;
}


struct FlowSpec {
  string descr;
  string source;
  CFlowSequenceSpec cFlowSequenceSpec;
}

struct IncomeSpec {
  string incomeType;
  FlowSpec flowSpec;
}

struct ExpenseSpec {
  string expenseType;
  FlowSpec flowSpec;
}

struct FlowModel {
  IncomeSpec[string] incomeModel;
  ExpenseSpec[string] expenseModel;
}