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use logisheets_parser::ast;

use crate::calc_engine::connector::Connector;

use super::super::{CalcValue, CalcVertex, Value};

pub fn calc<C>(args: Vec<CalcVertex>, fetcher: &mut C) -> CalcVertex
where
    C: Connector,
{
    assert_or_return!(args.len() == 2, ast::Error::Unspecified);
    let mut args_iter = args.into_iter();
    let first = fetcher.get_calc_value(args_iter.next().unwrap());
    assert_f64_from_calc_value!(end_date, first);
    let second = fetcher.get_calc_value(args_iter.next().unwrap());
    assert_f64_from_calc_value!(start_date, second);
    CalcVertex::from_number(end_date.trunc() - start_date.trunc())
}