// 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::itertools::Itertools;
use malachite_base::num::conversion::traits::RoundingFrom;
use malachite_base::rounding_modes::RoundingMode::*;
use malachite_base::test_util::stats::common_values_map::common_values_map;
use malachite_base::test_util::stats::median;
use malachite_base::test_util::stats::moments::{MomentStats, moment_stats};

pub fn random_integers_helper_helper<I: Clone + Iterator<Item = Integer>>(
    xs: I,
    expected_values: &[&str],
    expected_common_values: &[(&str, usize)],
    expected_sample_median: (&str, Option<&str>),
    expected_sample_moment_stats: MomentStats,
) {
    let actual_values = xs
        .clone()
        .map(|x| Integer::to_string(&x))
        .take(20)
        .collect_vec();
    let actual_values = actual_values.iter().map(String::as_str).collect_vec();
    let actual_common_values = common_values_map(1000000, 10, xs.clone())
        .into_iter()
        .map(|(x, freq)| (x.to_string(), freq))
        .collect_vec();
    let actual_common_values = actual_common_values
        .iter()
        .map(|(x, freq)| (x.as_str(), *freq))
        .collect_vec();
    let (median_lo, median_hi) = median(xs.clone().take(1000000));
    let (median_lo, median_hi) = (
        median_lo.to_string(),
        median_hi.map(|x| Integer::to_string(&x)),
    );
    let actual_sample_median = (median_lo.as_str(), median_hi.as_deref());
    let actual_sample_moment_stats =
        moment_stats(xs.take(1000000).map(|x| f64::rounding_from(&x, Nearest).0));
    assert_eq!(
        (
            actual_values.as_slice(),
            actual_common_values.as_slice(),
            actual_sample_median,
            actual_sample_moment_stats
        ),
        (
            expected_values,
            expected_common_values,
            expected_sample_median,
            expected_sample_moment_stats
        )
    );
}
