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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::integer::Integer;
use crate::integer_vector::IntegerVector;
use crate::natural::Natural;
use malachite_base::num::arithmetic::traits::{DivExact, DivExactAssign, NegAssign};
use malachite_base::num::basic::traits::{One, Zero};
impl DivExact<Integer> for IntegerVector {
type Output = Self;
/// Divides every element of an [`IntegerVector`] by an [`Integer`], taking the vector by value
/// and the Integer by value. Every element must be exactly divisible by the [`Integer`].
///
/// If some element is not exactly divisible by `c`, this function may panic or return a
/// meaningless result. Dividing by 1 returns the vector unchanged, and dividing by $-1$ negates
/// it.
///
/// $f(v, c) = v/c$.
///
/// # Worst-case complexity
/// $T(n) = O(n \log n \log\log n)$
///
/// $M(n) = O(n \log n)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is the total number of bits of the
/// elements and of `c`.
///
/// # Panics
/// Panics if `c` is zero.
///
/// # Examples
/// See [here](super::div_exact#div_exact).
///
/// This is equivalent to `_fmpz_vec_scalar_divexact_fmpz` from `fmpz_vec/scalar_divexact.c`,
/// FLINT 3.6.0.
#[inline]
fn div_exact(mut self, c: Integer) -> Self {
self.div_exact_assign(&c);
self
}
}
impl DivExact<&Integer> for IntegerVector {
type Output = Self;
/// Divides every element of an [`IntegerVector`] by an [`Integer`], taking the vector by value
/// and the Integer by reference. Every element must be exactly divisible by the [`Integer`].
///
/// If some element is not exactly divisible by `c`, this function may panic or return a
/// meaningless result. Dividing by 1 returns the vector unchanged, and dividing by $-1$ negates
/// it.
///
/// $f(v, c) = v/c$.
///
/// # Worst-case complexity
/// $T(n) = O(n \log n \log\log n)$
///
/// $M(n) = O(n \log n)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is the total number of bits of the
/// elements and of `c`.
///
/// # Panics
/// Panics if `c` is zero.
///
/// # Examples
/// See [here](super::div_exact#div_exact).
///
/// This is equivalent to `_fmpz_vec_scalar_divexact_fmpz` from `fmpz_vec/scalar_divexact.c`,
/// FLINT 3.6.0.
#[inline]
fn div_exact(mut self, c: &Integer) -> Self {
self.div_exact_assign(c);
self
}
}
impl DivExact<Integer> for &IntegerVector {
type Output = IntegerVector;
/// Divides every element of an [`IntegerVector`] by an [`Integer`], taking the vector by
/// reference and the Integer by value. Every element must be exactly divisible by the
/// [`Integer`].
///
/// If some element is not exactly divisible by `c`, this function may panic or return a
/// meaningless result. Dividing by 1 returns the vector unchanged, and dividing by $-1$ negates
/// it.
///
/// $f(v, c) = v/c$.
///
/// # Worst-case complexity
/// $T(n) = O(n \log n \log\log n)$
///
/// $M(n) = O(n \log n)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is the total number of bits of the
/// elements and of `c`.
///
/// # Panics
/// Panics if `c` is zero.
///
/// # Examples
/// See [here](super::div_exact#div_exact).
///
/// This is equivalent to `_fmpz_vec_scalar_divexact_fmpz` from `fmpz_vec/scalar_divexact.c`,
/// FLINT 3.6.0.
#[inline]
fn div_exact(self, c: Integer) -> IntegerVector {
self.div_exact(&c)
}
}
impl DivExact<&Integer> for &IntegerVector {
type Output = IntegerVector;
/// Divides every element of an [`IntegerVector`] by an [`Integer`], taking the vector by
/// reference and the Integer by reference. Every element must be exactly divisible by the
/// [`Integer`].
///
/// If some element is not exactly divisible by `c`, this function may panic or return a
/// meaningless result. Dividing by 1 returns the vector unchanged, and dividing by $-1$ negates
/// it.
///
/// $f(v, c) = v/c$.
///
/// # Worst-case complexity
/// $T(n) = O(n \log n \log\log n)$
///
/// $M(n) = O(n \log n)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is the total number of bits of the
/// elements and of `c`.
///
/// # Panics
/// Panics if `c` is zero.
///
/// # Examples
/// See [here](super::div_exact#div_exact).
///
/// This is equivalent to `_fmpz_vec_scalar_divexact_fmpz` from `fmpz_vec/scalar_divexact.c`,
/// FLINT 3.6.0.
fn div_exact(self, c: &Integer) -> IntegerVector {
IntegerVector {
elements: match *c {
integer_zero!() => panic!("division by zero"),
integer_one!() => self.elements.clone(),
integer_negative_one!() => self.elements.iter().map(|x| -x).collect(),
_ => self.elements.iter().map(|x| x.div_exact(c)).collect(),
},
}
}
}
impl DivExactAssign<Integer> for IntegerVector {
/// Divides every element of an [`IntegerVector`] by an [`Integer`], in place, taking the
/// Integer by value. Every element must be exactly divisible by the [`Integer`].
///
/// If some element is not exactly divisible by `c`, this function may panic or return a
/// meaningless result. Dividing by 1 returns the vector unchanged, and dividing by $-1$ negates
/// it.
///
/// $v \gets v/c$.
///
/// # Worst-case complexity
/// $T(n) = O(n \log n \log\log n)$
///
/// $M(n) = O(n \log n)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is the total number of bits of the
/// elements and of `c`.
///
/// # Panics
/// Panics if `c` is zero.
///
/// # Examples
/// See [here](super::div_exact#div_exact_assign).
///
/// This is equivalent to `_fmpz_vec_scalar_divexact_fmpz` from `fmpz_vec/scalar_divexact.c`,
/// FLINT 3.6.0.
#[inline]
fn div_exact_assign(&mut self, c: Integer) {
self.div_exact_assign(&c);
}
}
impl DivExactAssign<&Integer> for IntegerVector {
/// Divides every element of an [`IntegerVector`] by an [`Integer`], in place, taking the
/// Integer by reference. Every element must be exactly divisible by the [`Integer`].
///
/// If some element is not exactly divisible by `c`, this function may panic or return a
/// meaningless result. Dividing by 1 returns the vector unchanged, and dividing by $-1$ negates
/// it.
///
/// $v \gets v/c$.
///
/// # Worst-case complexity
/// $T(n) = O(n \log n \log\log n)$
///
/// $M(n) = O(n \log n)$
///
/// where $T$ is time, $M$ is additional memory, and $n$ is the total number of bits of the
/// elements and of `c`.
///
/// # Panics
/// Panics if `c` is zero.
///
/// # Examples
/// See [here](super::div_exact#div_exact_assign).
///
/// This is equivalent to `_fmpz_vec_scalar_divexact_fmpz` from `fmpz_vec/scalar_divexact.c`,
/// FLINT 3.6.0.
fn div_exact_assign(&mut self, c: &Integer) {
match *c {
integer_zero!() => panic!("division by zero"),
integer_one!() => {}
integer_negative_one!() => {
for x in &mut self.elements {
x.neg_assign();
}
}
_ => {
for x in &mut self.elements {
x.div_exact_assign(c);
}
}
}
}
}