use rand_core::SeedableRng;
use rand_xorshift::XorShiftRng;

use blstrs::*;
use ff::{Field, PrimeField};

#[bench]
fn bench_scalar_add_assign(b: &mut ::test::Bencher) {
    const SAMPLES: usize = 1000;

    let mut rng = XorShiftRng::from_seed([
        0x59, 0x62, 0xbe, 0x5d, 0x76, 0x3d, 0x31, 0x8d, 0x17, 0xdb, 0x37, 0x32, 0x54, 0x06, 0xbc,
        0xe5,
    ]);

    let v: Vec<(Scalar, Scalar)> = (0..SAMPLES)
        .map(|_| (Scalar::random(&mut rng), Scalar::random(&mut rng)))
        .collect();

    let mut count = 0;
    b.iter(|| {
        let mut tmp = v[count].0;
        tmp += &v[count].1;
        count = (count + 1) % SAMPLES;
        tmp
    });
}

#[bench]
fn bench_scalar_sub_assign(b: &mut ::test::Bencher) {
    const SAMPLES: usize = 1000;

    let mut rng = XorShiftRng::from_seed([
        0x59, 0x62, 0xbe, 0x5d, 0x76, 0x3d, 0x31, 0x8d, 0x17, 0xdb, 0x37, 0x32, 0x54, 0x06, 0xbc,
        0xe5,
    ]);

    let v: Vec<(Scalar, Scalar)> = (0..SAMPLES)
        .map(|_| (Scalar::random(&mut rng), Scalar::random(&mut rng)))
        .collect();

    let mut count = 0;
    b.iter(|| {
        let mut tmp = v[count].0;
        tmp -= &v[count].1;
        count = (count + 1) % SAMPLES;
        tmp
    });
}

#[bench]
fn bench_scalar_mul_assign(b: &mut ::test::Bencher) {
    const SAMPLES: usize = 1000;

    let mut rng = XorShiftRng::from_seed([
        0x59, 0x62, 0xbe, 0x5d, 0x76, 0x3d, 0x31, 0x8d, 0x17, 0xdb, 0x37, 0x32, 0x54, 0x06, 0xbc,
        0xe5,
    ]);

    let v: Vec<(Scalar, Scalar)> = (0..SAMPLES)
        .map(|_| (Scalar::random(&mut rng), Scalar::random(&mut rng)))
        .collect();

    let mut count = 0;
    b.iter(|| {
        let mut tmp = v[count].0;
        tmp *= &v[count].1;
        count = (count + 1) % SAMPLES;
        tmp
    });
}

#[bench]
fn bench_scalar_square(b: &mut ::test::Bencher) {
    const SAMPLES: usize = 1000;

    let mut rng = XorShiftRng::from_seed([
        0x59, 0x62, 0xbe, 0x5d, 0x76, 0x3d, 0x31, 0x8d, 0x17, 0xdb, 0x37, 0x32, 0x54, 0x06, 0xbc,
        0xe5,
    ]);

    let v: Vec<Scalar> = (0..SAMPLES).map(|_| Scalar::random(&mut rng)).collect();

    let mut count = 0;
    b.iter(|| {
        let tmp = v[count].square();
        count = (count + 1) % SAMPLES;
        tmp
    });
}

#[bench]
fn bench_scalar_inverse(b: &mut ::test::Bencher) {
    const SAMPLES: usize = 1000;

    let mut rng = XorShiftRng::from_seed([
        0x59, 0x62, 0xbe, 0x5d, 0x76, 0x3d, 0x31, 0x8d, 0x17, 0xdb, 0x37, 0x32, 0x54, 0x06, 0xbc,
        0xe5,
    ]);

    let v: Vec<Scalar> = (0..SAMPLES).map(|_| Scalar::random(&mut rng)).collect();

    let mut count = 0;
    b.iter(|| {
        count = (count + 1) % SAMPLES;
        v[count].invert()
    });
}

#[bench]
fn bench_scalar_negate(b: &mut ::test::Bencher) {
    const SAMPLES: usize = 1000;

    let mut rng = XorShiftRng::from_seed([
        0x59, 0x62, 0xbe, 0x5d, 0x76, 0x3d, 0x31, 0x8d, 0x17, 0xdb, 0x37, 0x32, 0x54, 0x06, 0xbc,
        0xe5,
    ]);

    let v: Vec<Scalar> = (0..SAMPLES).map(|_| Scalar::random(&mut rng)).collect();

    let mut count = 0;
    b.iter(|| {
        let tmp = -v[count];
        count = (count + 1) % SAMPLES;
        tmp
    });
}

#[bench]
fn bench_scalar_sqrt(b: &mut ::test::Bencher) {
    const SAMPLES: usize = 1000;

    let mut rng = XorShiftRng::from_seed([
        0x59, 0x62, 0xbe, 0x5d, 0x76, 0x3d, 0x31, 0x8d, 0x17, 0xdb, 0x37, 0x32, 0x54, 0x06, 0xbc,
        0xe5,
    ]);

    let v: Vec<Scalar> = (0..SAMPLES)
        .map(|_| Scalar::random(&mut rng).square())
        .collect();

    let mut count = 0;
    b.iter(|| {
        count = (count + 1) % SAMPLES;
        v[count].sqrt()
    });
}

#[bench]
fn bench_scalar_to_repr(b: &mut ::test::Bencher) {
    const SAMPLES: usize = 1000;

    let mut rng = XorShiftRng::from_seed([
        0x59, 0x62, 0xbe, 0x5d, 0x76, 0x3d, 0x31, 0x8d, 0x17, 0xdb, 0x37, 0x32, 0x54, 0x06, 0xbc,
        0xe5,
    ]);

    let v: Vec<Scalar> = (0..SAMPLES).map(|_| Scalar::random(&mut rng)).collect();

    let mut count = 0;
    b.iter(|| {
        count = (count + 1) % SAMPLES;
        v[count].to_repr()
    });
}

#[bench]
fn bench_scalar_from_repr(b: &mut ::test::Bencher) {
    const SAMPLES: usize = 1000;

    let mut rng = XorShiftRng::from_seed([
        0x59, 0x62, 0xbe, 0x5d, 0x76, 0x3d, 0x31, 0x8d, 0x17, 0xdb, 0x37, 0x32, 0x54, 0x06, 0xbc,
        0xe5,
    ]);

    let v: Vec<[u8; 32]> = (0..SAMPLES)
        .map(|_| Scalar::random(&mut rng).to_repr())
        .collect();

    let mut count = 0;
    b.iter(|| {
        count = (count + 1) % SAMPLES;
        Scalar::from_repr(v[count])
    });
}

#[bench]
fn bench_scalar_from_repr_vartime(b: &mut ::test::Bencher) {
    const SAMPLES: usize = 1000;

    let mut rng = XorShiftRng::from_seed([
        0x59, 0x62, 0xbe, 0x5d, 0x76, 0x3d, 0x31, 0x8d, 0x17, 0xdb, 0x37, 0x32, 0x54, 0x06, 0xbc,
        0xe5,
    ]);

    let v: Vec<[u8; 32]> = (0..SAMPLES)
        .map(|_| Scalar::random(&mut rng).to_repr())
        .collect();

    let mut count = 0;
    b.iter(|| {
        count = (count + 1) % SAMPLES;
        Scalar::from_repr_vartime(v[count])
    });
}