use crate::consts::DAYSEC;

///  Time scale transformation:  Universal Time, UT1, to International

///  Atomic Time, TAI.

///

///  This function is part of the International Astronomical Union's

///  SOFA (Standards of Fundamental Astronomy) software collection.

///

///  Status:  canonical.

///

///  Given:

///     ut11,ut12  double    UT1 as a 2-part Julian Date

///     dta        double    UT1-TAI in seconds

///

///  Returned:

///     tai1,tai2  double    TAI as a 2-part Julian Date

///

///  Returned (function value):

///                int       status:  0 = OK

///

pub fn ut1tai(ut11: f64, ut12: f64, dta: f64) -> Result<(f64, f64), i32> {

    let dtad = dta / DAYSEC;

    let (tai1, tai2);

    /* Result, safeguarding precision. */

    if ut11.abs() > ut12.abs() {

        tai1 = ut11;

        tai2 = ut12 - dtad;

    } else {

        tai1 = ut11 - dtad;

        tai2 = ut12;

    }

    Ok((tai1, tai2))

}