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use std::{fmt,fmt::{Display, Formatter}};
use std::collections::BTreeMap;
use std::ops::Neg;
use serde::{Deserialize, Serialize};
use chrono::{DateTime, Utc, NaiveDate};
use crate::currency::{Currency, CurrencyConverter, CurrencyError};
#[derive(Deserialize, Serialize, Debug, Clone, Copy, PartialEq)]
pub struct CashAmount {
pub amount: f64,
pub currency: Currency,
}
pub fn round2digits(x: f64, digits: i32) -> f64 {
(x * 10.0_f64.powi(digits)).round() / 10.0_f64.powi(digits)
}
impl CashAmount {
pub fn add(
&mut self,
cash_amount: CashAmount,
time: DateTime<Utc>,
currency_converter: &mut dyn CurrencyConverter,
with_rounding: bool,
) -> Result<&mut Self, CurrencyError> {
if self.currency == cash_amount.currency {
self.amount += cash_amount.amount;
Ok(self)
} else {
let fx_rate = currency_converter.fx_rate(cash_amount.currency, self.currency, time)?;
self.amount += fx_rate * cash_amount.amount;
if with_rounding {
let digits = self.currency.rounding_digits();
self.amount = round2digits(self.amount, digits);
}
Ok(self)
}
}
pub fn add_opt(
&mut self,
cash_amount: Option<CashAmount>,
time: DateTime<Utc>,
currency_converter: &mut dyn CurrencyConverter,
with_rounding: bool,
) -> Result<&mut Self, CurrencyError> {
match cash_amount {
None => Ok(self),
Some(cash_amount) => self.add(cash_amount, time, currency_converter, with_rounding),
}
}
pub fn sub(
&mut self,
cash_amount: CashAmount,
time: DateTime<Utc>,
currency_converter: &mut dyn CurrencyConverter,
with_rounding: bool,
) -> Result<&mut Self, CurrencyError> {
if self.currency == cash_amount.currency {
self.amount -= cash_amount.amount;
Ok(self)
} else {
let fx_rate = currency_converter.fx_rate(cash_amount.currency, self.currency, time)?;
self.amount -= fx_rate * cash_amount.amount;
if with_rounding {
let digits = self.currency.rounding_digits();
self.amount = round2digits(self.amount, digits);
}
Ok(self)
}
}
pub fn sub_opt(
&mut self,
cash_amount: Option<CashAmount>,
time: DateTime<Utc>,
currency_converter: &mut dyn CurrencyConverter,
with_rounding: bool,
) -> Result<&mut Self, CurrencyError> {
match cash_amount {
None => Ok(self),
Some(cash_amount) => self.sub(cash_amount, time, currency_converter, with_rounding),
}
}
pub fn round(&self, digits: i32) -> CashAmount {
CashAmount {
amount: round2digits(self.amount, digits),
currency: self.currency,
}
}
pub fn round_by_convention(&self, rounding_conventions: &BTreeMap<String, i32>) -> CashAmount {
match rounding_conventions.get_key_value(&self.currency.to_string()) {
Some((_, digits)) => self.round(*digits),
None => self.round(2),
}
}
}
impl Display for CashAmount {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "{:16.4} {}", self.amount, self.currency)
}
}
impl Neg for CashAmount {
type Output = CashAmount;
fn neg(self) -> Self::Output {
CashAmount {
amount: -self.amount,
currency: self.currency,
}
}
}
#[derive(Deserialize, Serialize, Debug, Clone, Copy)]
pub struct CashFlow {
pub amount: CashAmount,
pub date: NaiveDate,
}
impl CashFlow {
pub fn new(amount: f64, currency: Currency, date: NaiveDate) -> CashFlow {
CashFlow {
amount: CashAmount { amount, currency },
date,
}
}
pub fn aggregatable(&self, cf: &CashFlow) -> bool {
self.amount.currency == cf.amount.currency && self.date == cf.date
}
pub fn fuzzy_cash_flows_cmp_eq(&self, cf: &CashFlow, tol: f64) -> bool {
self.aggregatable(cf)
&& !self.amount.amount.is_nan()
&& !cf.amount.amount.is_nan()
&& (self.amount.amount - cf.amount.amount).abs() <= tol
}
}
impl Display for CashFlow {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "{} {}", self.date, self.amount)
}
}
impl Neg for CashFlow {
type Output = CashFlow;
fn neg(self) -> Self::Output {
CashFlow {
amount: -self.amount,
date: self.date,
}
}
}