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// Copyright © 2026 Mikhail Hogrefe
//
// This file is part of Malachite.
//
// Malachite is free software: you can redistribute it and/or modify it under the terms of the GNU
// Lesser General Public License (LGPL) as published by the Free Software Foundation; either version
// 3 of the License, or (at your option) any later version. See <https://www.gnu.org/licenses/>.
use crate::gaussian_rational::GaussianRational;
use malachite_base::num::conversion::traits::ConvertibleFrom;
use malachite_nz::gaussian_integer::GaussianInteger;
use malachite_nz::integer::Integer;
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub struct GaussianIntegerFromGaussianRationalError;
impl TryFrom<GaussianRational> for GaussianInteger {
type Error = GaussianIntegerFromGaussianRationalError;
/// Converts a [`GaussianRational`] to a [`GaussianInteger`], taking the [`GaussianRational`] by
/// value. If the real and imaginary parts of the [`GaussianRational`] are not both integers, an
/// error is returned.
///
/// # Worst-case complexity
/// Constant time and additional memory.
///
/// # Examples
/// ```
/// use malachite_nz::gaussian_integer::GaussianInteger;
/// use malachite_q::gaussian_rational::GaussianRational;
/// use malachite_q::gaussian_rational::conversion::gaussian_integer_from_gaussian_rational::*;
/// use std::str::FromStr;
///
/// let x = GaussianRational::from_str("2-3i").unwrap();
/// assert_eq!(GaussianInteger::try_from(x).unwrap().to_string(), "2-3i");
///
/// let x = GaussianRational::from_str("-22/7").unwrap();
/// assert_eq!(
/// GaussianInteger::try_from(x),
/// Err(GaussianIntegerFromGaussianRationalError)
/// );
///
/// let x = GaussianRational::from_str("2/3-5i/6").unwrap();
/// assert_eq!(
/// GaussianInteger::try_from(x),
/// Err(GaussianIntegerFromGaussianRationalError)
/// );
/// ```
fn try_from(x: GaussianRational) -> Result<Self, Self::Error> {
Ok(Self {
real: Integer::try_from(x.real)
.map_err(|_| GaussianIntegerFromGaussianRationalError)?,
imaginary: Integer::try_from(x.imaginary)
.map_err(|_| GaussianIntegerFromGaussianRationalError)?,
})
}
}
impl TryFrom<&GaussianRational> for GaussianInteger {
type Error = GaussianIntegerFromGaussianRationalError;
/// Converts a [`GaussianRational`] to a [`GaussianInteger`], taking the [`GaussianRational`] by
/// reference. If the real and imaginary parts of the [`GaussianRational`] are not both
/// integers, an error is returned.
///
/// # Worst-case complexity
/// $T(n) = O(n)$
///
/// $M(n) = O(n)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is `max(x.real.significant_bits(),
/// x.imaginary.significant_bits())`.
///
/// # Examples
/// ```
/// use malachite_nz::gaussian_integer::GaussianInteger;
/// use malachite_q::gaussian_rational::GaussianRational;
/// use malachite_q::gaussian_rational::conversion::gaussian_integer_from_gaussian_rational::*;
/// use std::str::FromStr;
///
/// let x = GaussianRational::from_str("2-3i").unwrap();
/// assert_eq!(GaussianInteger::try_from(&x).unwrap().to_string(), "2-3i");
///
/// let x = GaussianRational::from_str("-22/7").unwrap();
/// assert_eq!(
/// GaussianInteger::try_from(&x),
/// Err(GaussianIntegerFromGaussianRationalError)
/// );
///
/// let x = GaussianRational::from_str("2/3-5i/6").unwrap();
/// assert_eq!(
/// GaussianInteger::try_from(&x),
/// Err(GaussianIntegerFromGaussianRationalError)
/// );
/// ```
fn try_from(x: &GaussianRational) -> Result<Self, Self::Error> {
Ok(Self {
real: Integer::try_from(&x.real)
.map_err(|_| GaussianIntegerFromGaussianRationalError)?,
imaginary: Integer::try_from(&x.imaginary)
.map_err(|_| GaussianIntegerFromGaussianRationalError)?,
})
}
}
impl ConvertibleFrom<&GaussianRational> for GaussianInteger {
/// Determines whether a [`GaussianRational`] can be converted to a [`GaussianInteger`] (that
/// is, whether its real and imaginary parts are both integers), taking the [`GaussianRational`]
/// by reference.
///
/// # Worst-case complexity
/// Constant time and additional memory.
///
/// # Examples
/// ```
/// use malachite_base::num::conversion::traits::ConvertibleFrom;
/// use malachite_nz::gaussian_integer::GaussianInteger;
/// use malachite_q::gaussian_rational::GaussianRational;
/// use std::str::FromStr;
///
/// let x = GaussianRational::from_str("2-3i").unwrap();
/// assert_eq!(GaussianInteger::convertible_from(&x), true);
///
/// let x = GaussianRational::from_str("-22/7").unwrap();
/// assert_eq!(GaussianInteger::convertible_from(&x), false);
///
/// let x = GaussianRational::from_str("2/3-5i/6").unwrap();
/// assert_eq!(GaussianInteger::convertible_from(&x), false);
/// ```
#[inline]
fn convertible_from(x: &GaussianRational) -> bool {
Integer::convertible_from(&x.real) && Integer::convertible_from(&x.imaginary)
}
}