use super::*;

extern crate test;
use std::io;
use std::io::prelude::*;

use self::test::test::Bencher;

// Test vectors generated from R, using the script src/etc/stat-test-vectors.r.

macro_rules! assert_approx_eq {
    ($a: expr, $b: expr) => {{
        let (a, b) = (&$a, &$b);
        assert!((*a - *b).abs() < 1.0e-6, "{} is not approximately equal to {}", *a, *b);
    }};
}

fn check(samples: &[f64], summ: &Summary) {
    let summ2 = Summary::new(samples);

    let mut w = io::sink();
    let w = &mut w;
    (write!(w, "\n")).unwrap();

    assert_eq!(summ.sum, summ2.sum);
    assert_eq!(summ.min, summ2.min);
    assert_eq!(summ.max, summ2.max);
    assert_eq!(summ.mean, summ2.mean);
    assert_eq!(summ.median, summ2.median);

    // We needed a few more digits to get exact equality on these
    // but they're within float epsilon, which is 1.0e-6.
    assert_approx_eq!(summ.var, summ2.var);
    assert_approx_eq!(summ.std_dev, summ2.std_dev);
    assert_approx_eq!(summ.std_dev_pct, summ2.std_dev_pct);
    assert_approx_eq!(summ.median_abs_dev, summ2.median_abs_dev);
    assert_approx_eq!(summ.median_abs_dev_pct, summ2.median_abs_dev_pct);

    assert_eq!(summ.quartiles, summ2.quartiles);
    assert_eq!(summ.iqr, summ2.iqr);
}

#[test]
fn test_min_max_nan() {
    let xs = &[1.0, 2.0, f64::NAN, 3.0, 4.0];
    let summary = Summary::new(xs);
    assert_eq!(summary.min, 1.0);
    assert_eq!(summary.max, 4.0);
}

#[test]
fn test_norm2() {
    let val = &[958.0000000000, 924.0000000000];
    let summ = &Summary {
        sum: 1882.0000000000,
        min: 924.0000000000,
        max: 958.0000000000,
        mean: 941.0000000000,
        median: 941.0000000000,
        var: 578.0000000000,
        std_dev: 24.0416305603,
        std_dev_pct: 2.5549022912,
        median_abs_dev: 25.2042000000,
        median_abs_dev_pct: 2.6784484591,
        quartiles: (932.5000000000, 941.0000000000, 949.5000000000),
        iqr: 17.0000000000,
    };
    check(val, summ);
}
#[test]
fn test_norm10narrow() {
    let val = &[
        966.0000000000,
        985.0000000000,
        1110.0000000000,
        848.0000000000,
        821.0000000000,
        975.0000000000,
        962.0000000000,
        1157.0000000000,
        1217.0000000000,
        955.0000000000,
    ];
    let summ = &Summary {
        sum: 9996.0000000000,
        min: 821.0000000000,
        max: 1217.0000000000,
        mean: 999.6000000000,
        median: 970.5000000000,
        var: 16050.7111111111,
        std_dev: 126.6914010938,
        std_dev_pct: 12.6742097933,
        median_abs_dev: 102.2994000000,
        median_abs_dev_pct: 10.5408964451,
        quartiles: (956.7500000000, 970.5000000000, 1078.7500000000),
        iqr: 122.0000000000,
    };
    check(val, summ);
}
#[test]
fn test_norm10medium() {
    let val = &[
        954.0000000000,
        1064.0000000000,
        855.0000000000,
        1000.0000000000,
        743.0000000000,
        1084.0000000000,
        704.0000000000,
        1023.0000000000,
        357.0000000000,
        869.0000000000,
    ];
    let summ = &Summary {
        sum: 8653.0000000000,
        min: 357.0000000000,
        max: 1084.0000000000,
        mean: 865.3000000000,
        median: 911.5000000000,
        var: 48628.4555555556,
        std_dev: 220.5186059170,
        std_dev_pct: 25.4846418487,
        median_abs_dev: 195.7032000000,
        median_abs_dev_pct: 21.4704552935,
        quartiles: (771.0000000000, 911.5000000000, 1017.2500000000),
        iqr: 246.2500000000,
    };
    check(val, summ);
}
#[test]
fn test_norm10wide() {
    let val = &[
        505.0000000000,
        497.0000000000,
        1591.0000000000,
        887.0000000000,
        1026.0000000000,
        136.0000000000,
        1580.0000000000,
        940.0000000000,
        754.0000000000,
        1433.0000000000,
    ];
    let summ = &Summary {
        sum: 9349.0000000000,
        min: 136.0000000000,
        max: 1591.0000000000,
        mean: 934.9000000000,
        median: 913.5000000000,
        var: 239208.9888888889,
        std_dev: 489.0899599142,
        std_dev_pct: 52.3146817750,
        median_abs_dev: 611.5725000000,
        median_abs_dev_pct: 66.9482758621,
        quartiles: (567.2500000000, 913.5000000000, 1331.2500000000),
        iqr: 764.0000000000,
    };
    check(val, summ);
}
#[test]
fn test_norm25verynarrow() {
    let val = &[
        991.0000000000,
        1018.0000000000,
        998.0000000000,
        1013.0000000000,
        974.0000000000,
        1007.0000000000,
        1014.0000000000,
        999.0000000000,
        1011.0000000000,
        978.0000000000,
        985.0000000000,
        999.0000000000,
        983.0000000000,
        982.0000000000,
        1015.0000000000,
        1002.0000000000,
        977.0000000000,
        948.0000000000,
        1040.0000000000,
        974.0000000000,
        996.0000000000,
        989.0000000000,
        1015.0000000000,
        994.0000000000,
        1024.0000000000,
    ];
    let summ = &Summary {
        sum: 24926.0000000000,
        min: 948.0000000000,
        max: 1040.0000000000,
        mean: 997.0400000000,
        median: 998.0000000000,
        var: 393.2066666667,
        std_dev: 19.8294393937,
        std_dev_pct: 1.9888308788,
        median_abs_dev: 22.2390000000,
        median_abs_dev_pct: 2.2283567134,
        quartiles: (983.0000000000, 998.0000000000, 1013.0000000000),
        iqr: 30.0000000000,
    };
    check(val, summ);
}
#[test]
fn test_exp10a() {
    let val = &[
        23.0000000000,
        11.0000000000,
        2.0000000000,
        57.0000000000,
        4.0000000000,
        12.0000000000,
        5.0000000000,
        29.0000000000,
        3.0000000000,
        21.0000000000,
    ];
    let summ = &Summary {
        sum: 167.0000000000,
        min: 2.0000000000,
        max: 57.0000000000,
        mean: 16.7000000000,
        median: 11.5000000000,
        var: 287.7888888889,
        std_dev: 16.9643416875,
        std_dev_pct: 101.5828843560,
        median_abs_dev: 13.3434000000,
        median_abs_dev_pct: 116.0295652174,
        quartiles: (4.2500000000, 11.5000000000, 22.5000000000),
        iqr: 18.2500000000,
    };
    check(val, summ);
}
#[test]
fn test_exp10b() {
    let val = &[
        24.0000000000,
        17.0000000000,
        6.0000000000,
        38.0000000000,
        25.0000000000,
        7.0000000000,
        51.0000000000,
        2.0000000000,
        61.0000000000,
        32.0000000000,
    ];
    let summ = &Summary {
        sum: 263.0000000000,
        min: 2.0000000000,
        max: 61.0000000000,
        mean: 26.3000000000,
        median: 24.5000000000,
        var: 383.5666666667,
        std_dev: 19.5848580967,
        std_dev_pct: 74.4671410520,
        median_abs_dev: 22.9803000000,
        median_abs_dev_pct: 93.7971428571,
        quartiles: (9.5000000000, 24.5000000000, 36.5000000000),
        iqr: 27.0000000000,
    };
    check(val, summ);
}
#[test]
fn test_exp10c() {
    let val = &[
        71.0000000000,
        2.0000000000,
        32.0000000000,
        1.0000000000,
        6.0000000000,
        28.0000000000,
        13.0000000000,
        37.0000000000,
        16.0000000000,
        36.0000000000,
    ];
    let summ = &Summary {
        sum: 242.0000000000,
        min: 1.0000000000,
        max: 71.0000000000,
        mean: 24.2000000000,
        median: 22.0000000000,
        var: 458.1777777778,
        std_dev: 21.4050876611,
        std_dev_pct: 88.4507754589,
        median_abs_dev: 21.4977000000,
        median_abs_dev_pct: 97.7168181818,
        quartiles: (7.7500000000, 22.0000000000, 35.0000000000),
        iqr: 27.2500000000,
    };
    check(val, summ);
}
#[test]
fn test_exp25() {
    let val = &[
        3.0000000000,
        24.0000000000,
        1.0000000000,
        19.0000000000,
        7.0000000000,
        5.0000000000,
        30.0000000000,
        39.0000000000,
        31.0000000000,
        13.0000000000,
        25.0000000000,
        48.0000000000,
        1.0000000000,
        6.0000000000,
        42.0000000000,
        63.0000000000,
        2.0000000000,
        12.0000000000,
        108.0000000000,
        26.0000000000,
        1.0000000000,
        7.0000000000,
        44.0000000000,
        25.0000000000,
        11.0000000000,
    ];
    let summ = &Summary {
        sum: 593.0000000000,
        min: 1.0000000000,
        max: 108.0000000000,
        mean: 23.7200000000,
        median: 19.0000000000,
        var: 601.0433333333,
        std_dev: 24.5161851301,
        std_dev_pct: 103.3565983562,
        median_abs_dev: 19.2738000000,
        median_abs_dev_pct: 101.4410526316,
        quartiles: (6.0000000000, 19.0000000000, 31.0000000000),
        iqr: 25.0000000000,
    };
    check(val, summ);
}
#[test]
fn test_binom25() {
    let val = &[
        18.0000000000,
        17.0000000000,
        27.0000000000,
        15.0000000000,
        21.0000000000,
        25.0000000000,
        17.0000000000,
        24.0000000000,
        25.0000000000,
        24.0000000000,
        26.0000000000,
        26.0000000000,
        23.0000000000,
        15.0000000000,
        23.0000000000,
        17.0000000000,
        18.0000000000,
        18.0000000000,
        21.0000000000,
        16.0000000000,
        15.0000000000,
        31.0000000000,
        20.0000000000,
        17.0000000000,
        15.0000000000,
    ];
    let summ = &Summary {
        sum: 514.0000000000,
        min: 15.0000000000,
        max: 31.0000000000,
        mean: 20.5600000000,
        median: 20.0000000000,
        var: 20.8400000000,
        std_dev: 4.5650848842,
        std_dev_pct: 22.2037202539,
        median_abs_dev: 5.9304000000,
        median_abs_dev_pct: 29.6520000000,
        quartiles: (17.0000000000, 20.0000000000, 24.0000000000),
        iqr: 7.0000000000,
    };
    check(val, summ);
}
#[test]
fn test_pois25lambda30() {
    let val = &[
        27.0000000000,
        33.0000000000,
        34.0000000000,
        34.0000000000,
        24.0000000000,
        39.0000000000,
        28.0000000000,
        27.0000000000,
        31.0000000000,
        28.0000000000,
        38.0000000000,
        21.0000000000,
        33.0000000000,
        36.0000000000,
        29.0000000000,
        37.0000000000,
        32.0000000000,
        34.0000000000,
        31.0000000000,
        39.0000000000,
        25.0000000000,
        31.0000000000,
        32.0000000000,
        40.0000000000,
        24.0000000000,
    ];
    let summ = &Summary {
        sum: 787.0000000000,
        min: 21.0000000000,
        max: 40.0000000000,
        mean: 31.4800000000,
        median: 32.0000000000,
        var: 26.5933333333,
        std_dev: 5.1568724372,
        std_dev_pct: 16.3814245145,
        median_abs_dev: 5.9304000000,
        median_abs_dev_pct: 18.5325000000,
        quartiles: (28.0000000000, 32.0000000000, 34.0000000000),
        iqr: 6.0000000000,
    };
    check(val, summ);
}
#[test]
fn test_pois25lambda40() {
    let val = &[
        42.0000000000,
        50.0000000000,
        42.0000000000,
        46.0000000000,
        34.0000000000,
        45.0000000000,
        34.0000000000,
        49.0000000000,
        39.0000000000,
        28.0000000000,
        40.0000000000,
        35.0000000000,
        37.0000000000,
        39.0000000000,
        46.0000000000,
        44.0000000000,
        32.0000000000,
        45.0000000000,
        42.0000000000,
        37.0000000000,
        48.0000000000,
        42.0000000000,
        33.0000000000,
        42.0000000000,
        48.0000000000,
    ];
    let summ = &Summary {
        sum: 1019.0000000000,
        min: 28.0000000000,
        max: 50.0000000000,
        mean: 40.7600000000,
        median: 42.0000000000,
        var: 34.4400000000,
        std_dev: 5.8685603004,
        std_dev_pct: 14.3978417577,
        median_abs_dev: 5.9304000000,
        median_abs_dev_pct: 14.1200000000,
        quartiles: (37.0000000000, 42.0000000000, 45.0000000000),
        iqr: 8.0000000000,
    };
    check(val, summ);
}
#[test]
fn test_pois25lambda50() {
    let val = &[
        45.0000000000,
        43.0000000000,
        44.0000000000,
        61.0000000000,
        51.0000000000,
        53.0000000000,
        59.0000000000,
        52.0000000000,
        49.0000000000,
        51.0000000000,
        51.0000000000,
        50.0000000000,
        49.0000000000,
        56.0000000000,
        42.0000000000,
        52.0000000000,
        51.0000000000,
        43.0000000000,
        48.0000000000,
        48.0000000000,
        50.0000000000,
        42.0000000000,
        43.0000000000,
        42.0000000000,
        60.0000000000,
    ];
    let summ = &Summary {
        sum: 1235.0000000000,
        min: 42.0000000000,
        max: 61.0000000000,
        mean: 49.4000000000,
        median: 50.0000000000,
        var: 31.6666666667,
        std_dev: 5.6273143387,
        std_dev_pct: 11.3913245723,
        median_abs_dev: 4.4478000000,
        median_abs_dev_pct: 8.8956000000,
        quartiles: (44.0000000000, 50.0000000000, 52.0000000000),
        iqr: 8.0000000000,
    };
    check(val, summ);
}
#[test]
fn test_unif25() {
    let val = &[
        99.0000000000,
        55.0000000000,
        92.0000000000,
        79.0000000000,
        14.0000000000,
        2.0000000000,
        33.0000000000,
        49.0000000000,
        3.0000000000,
        32.0000000000,
        84.0000000000,
        59.0000000000,
        22.0000000000,
        86.0000000000,
        76.0000000000,
        31.0000000000,
        29.0000000000,
        11.0000000000,
        41.0000000000,
        53.0000000000,
        45.0000000000,
        44.0000000000,
        98.0000000000,
        98.0000000000,
        7.0000000000,
    ];
    let summ = &Summary {
        sum: 1242.0000000000,
        min: 2.0000000000,
        max: 99.0000000000,
        mean: 49.6800000000,
        median: 45.0000000000,
        var: 1015.6433333333,
        std_dev: 31.8691595957,
        std_dev_pct: 64.1488719719,
        median_abs_dev: 45.9606000000,
        median_abs_dev_pct: 102.1346666667,
        quartiles: (29.0000000000, 45.0000000000, 79.0000000000),
        iqr: 50.0000000000,
    };
    check(val, summ);
}

#[test]
fn test_sum_f64s() {
    assert_eq!([0.5f64, 3.2321f64, 1.5678f64].sum(), 5.2999);
}
#[test]
fn test_sum_f64_between_ints_that_sum_to_0() {
    assert_eq!([1e30f64, 1.2f64, -1e30f64].sum(), 1.2);
}

#[bench]
fn sum_three_items(b: &mut Bencher) {
    b.iter(|| {
        [1e20f64, 1.5f64, -1e20f64].sum();
    })
}
#[bench]
fn sum_many_f64(b: &mut Bencher) {
    let nums = [-1e30f64, 1e60, 1e30, 1.0, -1e60];
    let v = (0..500).map(|i| nums[i % 5]).collect::<Vec<_>>();

    b.iter(|| {
        v.sum();
    })
}

#[bench]
fn no_iter(_: &mut Bencher) {}