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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::{
DivRound, DivRoundAssign, EntrywiseDivRound, EntrywiseDivRoundAssign, NegAssign,
};
use malachite_base::num::basic::traits::{One, Zero};
use malachite_base::rounding_modes::RoundingMode;
impl EntrywiseDivRound<Integer> for IntegerVector {
type Output = Self;
/// Divides every element of an [`IntegerVector`] by an [`Integer`], taking the vector by value
/// and the scalar by value, and rounds every quotient according to the specified rounding mode.
///
/// Each quotient is rounded as by [`DivRound`], but no [`Ordering`](core::cmp::Ordering) is
/// returned, since with `Nearest` different elements may be rounded in different directions.
/// Passing `Down` is equivalent to using `/`.
///
/// $f(v, c, r)_i = \operatorname{round}(v_i/c)$, where $\operatorname{round}$ rounds according
/// to `rm`.
///
/// # 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, or if `rm` is `Exact` and some element is not divisible by `c`.
///
/// # Examples
/// See [here](super::entrywise_div_round#entrywise_div_round).
///
/// With `rm` equal to `Floor`, this is equivalent to `_fmpz_vec_scalar_fdiv_q_fmpz` from
/// `fmpz_vec/scalar.c`, FLINT 3.6.0.
#[inline]
fn entrywise_div_round(mut self, c: Integer, rm: RoundingMode) -> Self {
self.entrywise_div_round_assign(&c, rm);
self
}
}
impl EntrywiseDivRound<&Integer> for IntegerVector {
type Output = Self;
/// Divides every element of an [`IntegerVector`] by an [`Integer`], taking the vector by value
/// and the scalar by reference, and rounds every quotient according to the specified rounding
/// mode.
///
/// Each quotient is rounded as by [`DivRound`], but no [`Ordering`](core::cmp::Ordering) is
/// returned, since with `Nearest` different elements may be rounded in different directions.
/// Passing `Down` is equivalent to using `/`.
///
/// $f(v, c, r)_i = \operatorname{round}(v_i/c)$, where $\operatorname{round}$ rounds according
/// to `rm`.
///
/// # 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, or if `rm` is `Exact` and some element is not divisible by `c`.
///
/// # Examples
/// See [here](super::entrywise_div_round#entrywise_div_round).
///
/// With `rm` equal to `Floor`, this is equivalent to `_fmpz_vec_scalar_fdiv_q_fmpz` from
/// `fmpz_vec/scalar.c`, FLINT 3.6.0.
#[inline]
fn entrywise_div_round(mut self, c: &Integer, rm: RoundingMode) -> Self {
self.entrywise_div_round_assign(c, rm);
self
}
}
impl EntrywiseDivRound<Integer> for &IntegerVector {
type Output = IntegerVector;
/// Divides every element of an [`IntegerVector`] by an [`Integer`], taking the vector by
/// reference and the scalar by value, and rounds every quotient according to the specified
/// rounding mode.
///
/// Each quotient is rounded as by [`DivRound`], but no [`Ordering`](core::cmp::Ordering) is
/// returned, since with `Nearest` different elements may be rounded in different directions.
/// Passing `Down` is equivalent to using `/`.
///
/// $f(v, c, r)_i = \operatorname{round}(v_i/c)$, where $\operatorname{round}$ rounds according
/// to `rm`.
///
/// # 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, or if `rm` is `Exact` and some element is not divisible by `c`.
///
/// # Examples
/// See [here](super::entrywise_div_round#entrywise_div_round).
///
/// With `rm` equal to `Floor`, this is equivalent to `_fmpz_vec_scalar_fdiv_q_fmpz` from
/// `fmpz_vec/scalar.c`, FLINT 3.6.0.
#[inline]
fn entrywise_div_round(self, c: Integer, rm: RoundingMode) -> IntegerVector {
self.entrywise_div_round(&c, rm)
}
}
impl EntrywiseDivRound<&Integer> for &IntegerVector {
type Output = IntegerVector;
/// Divides every element of an [`IntegerVector`] by an [`Integer`], taking the vector by
/// reference and the scalar by reference, and rounds every quotient according to the specified
/// rounding mode.
///
/// Each quotient is rounded as by [`DivRound`], but no [`Ordering`](core::cmp::Ordering) is
/// returned, since with `Nearest` different elements may be rounded in different directions.
/// Passing `Down` is equivalent to using `/`.
///
/// $f(v, c, r)_i = \operatorname{round}(v_i/c)$, where $\operatorname{round}$ rounds according
/// to `rm`.
///
/// # 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, or if `rm` is `Exact` and some element is not divisible by `c`.
///
/// # Examples
/// See [here](super::entrywise_div_round#entrywise_div_round).
///
/// With `rm` equal to `Floor`, this is equivalent to `_fmpz_vec_scalar_fdiv_q_fmpz` from
/// `fmpz_vec/scalar.c`, FLINT 3.6.0.
fn entrywise_div_round(self, c: &Integer, rm: RoundingMode) -> 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_round(c, rm).0).collect(),
},
}
}
}
impl EntrywiseDivRoundAssign<Integer> for IntegerVector {
/// Divides every element of an [`IntegerVector`] by an [`Integer`], in place, taking the scalar
/// by value, and rounds every quotient according to the specified rounding mode.
///
/// Each quotient is rounded as by [`DivRound`], but no [`Ordering`](core::cmp::Ordering) is
/// returned, since with `Nearest` different elements may be rounded in different directions.
/// Passing `Down` is equivalent to using `/`.
///
/// $v_i \gets \operatorname{round}(v_i/c)$, where $\operatorname{round}$ rounds according to
/// `rm`.
///
/// # 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, or if `rm` is `Exact` and some element is not divisible by `c`.
///
/// # Examples
/// See [here](super::entrywise_div_round#entrywise_div_round_assign).
///
/// With `rm` equal to `Floor`, this is equivalent to `_fmpz_vec_scalar_fdiv_q_fmpz` from
/// `fmpz_vec/scalar.c`, FLINT 3.6.0.
#[inline]
fn entrywise_div_round_assign(&mut self, c: Integer, rm: RoundingMode) {
self.entrywise_div_round_assign(&c, rm);
}
}
impl EntrywiseDivRoundAssign<&Integer> for IntegerVector {
/// Divides every element of an [`IntegerVector`] by an [`Integer`], in place, taking the scalar
/// by reference, and rounds every quotient according to the specified rounding mode.
///
/// Each quotient is rounded as by [`DivRound`], but no [`Ordering`](core::cmp::Ordering) is
/// returned, since with `Nearest` different elements may be rounded in different directions.
/// Passing `Down` is equivalent to using `/`.
///
/// $v_i \gets \operatorname{round}(v_i/c)$, where $\operatorname{round}$ rounds according to
/// `rm`.
///
/// # 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, or if `rm` is `Exact` and some element is not divisible by `c`.
///
/// # Examples
/// See [here](super::entrywise_div_round#entrywise_div_round_assign).
///
/// With `rm` equal to `Floor`, this is equivalent to `_fmpz_vec_scalar_fdiv_q_fmpz` from
/// `fmpz_vec/scalar.c`, FLINT 3.6.0.
fn entrywise_div_round_assign(&mut self, c: &Integer, rm: RoundingMode) {
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_round_assign(c, rm);
}
}
}
}
}