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use chrono::{Datelike, Duration};
use num_traits::Zero;
use crate::currency;
use crate::types::{Date, Decimal};
#[derive(Clone, Copy)]
pub struct Country {
pub currency: &'static str,
tax_rate: Decimal,
tax_precision: u32,
}
impl Country {
pub fn round_tax(&self, tax: Decimal) -> Decimal {
currency::round_to(currency::round(tax), self.tax_precision)
}
pub fn tax_to_pay(&self, income: Decimal, paid_tax: Option<Decimal>) -> Decimal {
let income = currency::round(income);
if income.is_sign_negative() || income.is_zero() {
return dec!(0);
}
let tax_to_pay = self.round_tax(income * self.tax_rate);
if let Some(paid_tax) = paid_tax {
assert!(!paid_tax.is_sign_negative());
let tax_deduction = self.round_tax(paid_tax);
if tax_deduction < tax_to_pay {
tax_to_pay - tax_deduction
} else {
dec!(0)
}
} else {
tax_to_pay
}
}
pub fn deduce_income(&self, result_income: Decimal) -> Decimal {
currency::round(result_income / (dec!(1) - self.tax_rate))
}
}
pub fn russia() -> Country {
Country {
currency: "RUB",
tax_rate: Decimal::new(13, 2),
tax_precision: 0,
}
}
pub fn us() -> Country {
Country {
currency: "USD",
tax_rate: Decimal::new(10, 2),
tax_precision: 2,
}
}
pub fn is_valid_execution_date(conclusion: Date, execution: Date) -> bool {
let expected_execution = conclusion + Duration::days(2);
conclusion <= execution && get_russian_stock_exchange_min_last_working_day(execution) <= expected_execution
}
pub fn get_russian_stock_exchange_min_last_working_day(today: Date) -> Date {
if today.month() == 1 && today.day() < 10 {
Date::from_ymd(today.year() - 1, 12, 30)
} else if today.month() == 3 && today.day() == 12 {
today - Duration::days(4)
} else if today.month() == 5 && today.day() >= 3 && today.day() <= 13 {
today - Duration::days(5)
} else if today.year() == 2020 && today.month() == 4 && today.day() <= 6 {
Date::from_ymd(2020, 3, 28)
} else {
today - Duration::days(3)
}
}