#![allow(
    non_upper_case_globals,
    non_camel_case_types,
    non_snake_case,
)]
use std::mem;
use std::arch::x86_64::*;
use std::f64::consts::PI;

#[repr(C)]
struct body {
    position: [f64; 3],
    velocity: [f64; 3],
    mass: f64,
}

const SOLAR_MASS: f64 = 4. * PI * PI;
const DAYS_PER_YEAR: f64 = 365.24;
const BODIES_COUNT: usize = 5;

static mut solar_Bodies: [body; BODIES_COUNT] = [
    body { // Sun
        mass: SOLAR_MASS,
        position: [0.; 3],
        velocity: [0.; 3],
    },
    body { // Jupiter
        mass: 9.54791938424326609e-04 * SOLAR_MASS,
        position: [
            4.84143144246472090e+00,
            -1.16032004402742839e+00,
            -1.03622044471123109e-01
        ],
        velocity: [
            1.66007664274403694e-03 * DAYS_PER_YEAR,
            7.69901118419740425e-03 * DAYS_PER_YEAR,
            -6.90460016972063023e-05 * DAYS_PER_YEAR
        ]
    },
    body { // Saturn
        mass: 2.85885980666130812e-04 * SOLAR_MASS,
        position: [
            8.34336671824457987e+00,
            4.12479856412430479e+00,
            -4.03523417114321381e-01
        ],
        velocity: [
            -2.76742510726862411e-03 * DAYS_PER_YEAR,
            4.99852801234917238e-03 * DAYS_PER_YEAR,
            2.30417297573763929e-05 * DAYS_PER_YEAR
        ]
    },
    body { // Uranus
        mass: 4.36624404335156298e-05 * SOLAR_MASS,
        position: [
            1.28943695621391310e+01,
            -1.51111514016986312e+01,
            -2.23307578892655734e-01
        ],
        velocity: [
            2.96460137564761618e-03 * DAYS_PER_YEAR,
            2.37847173959480950e-03 * DAYS_PER_YEAR,
            -2.96589568540237556e-05 * DAYS_PER_YEAR
        ]
    },
    body { // Neptune
        mass: 5.15138902046611451e-05 * SOLAR_MASS,
        position: [
            1.53796971148509165e+01,
            -2.59193146099879641e+01,
            1.79258772950371181e-01
        ],
        velocity: [
            2.68067772490389322e-03 * DAYS_PER_YEAR,
            1.62824170038242295e-03 * DAYS_PER_YEAR,
            -9.51592254519715870e-05 * DAYS_PER_YEAR
        ]
    },
];

unsafe fn offset_Momentum(bodies: *mut body) {
    for i in 0..BODIES_COUNT {
        for m in 0..3 {
            (*bodies.add(0)).velocity[m] -=
                (*bodies.add(i)).velocity[m]
                * (*bodies.add(i)).mass / SOLAR_MASS;
        }
    }
}

unsafe fn output_Energy(bodies: *mut body) {
    let mut energy = 0.;
    for i in 0..BODIES_COUNT {
        // Add the kinetic energy for each body.
        energy += 0.5 * (*bodies.add(i)).mass * (
            (*bodies.add(i)).velocity[0]
                * (*bodies.add(i)).velocity[0]
            + (*bodies.add(i)).velocity[1]
                * (*bodies.add(i)).velocity[1]
            + (*bodies.add(i)).velocity[2]
                * (*bodies.add(i)).velocity[2]);

        // Add the potential energy between this body and
        // every other body
        for j in i+1..BODIES_COUNT {
            let mut position_Delta =
                [mem::MaybeUninit::<f64>::uninit(); 3];

            for m in 0..3 {
                position_Delta[m].as_mut_ptr().write(
                    (*bodies.add(i)).position[m]
                        - (*bodies.add(j)).position[m]
                );
            }
            let position_Delta: [f64; 3] =
                mem::transmute(position_Delta);

            energy -= (*bodies.add(i)).mass
                * (*bodies.add(j)).mass
                / f64::sqrt(
                    position_Delta[0]*position_Delta[0]+
                        position_Delta[1]*position_Delta[1]+
                        position_Delta[2]*position_Delta[2]
                );
        }
    }

    // Output the total energy of the system
    println!("{:.9}", energy);
}

fn main() {
    println!("Hello, world!");
}