moontime 0.2.1

A simple serverless NAIF SPICE lookup server
Documentation 
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pub mod types;
pub use types::*;


use core::ffi::CStr;
use std::sync::{ Arc, Mutex };
use spice::{
    cstr,
    SpiceLock,
};

use time::{
    OffsetDateTime,
    format_description::well_known::Rfc3339,
};

fn to_cspice_string(t : OffsetDateTime) -> String {
    let format=Rfc3339;
    t.format(&format).unwrap()
}

pub fn get_et(
    sl_mutex: Arc<Mutex<SpiceLock>>, 
    t: OffsetDateTime,
    ) -> f64 
{
    let lock = sl_mutex.lock().unwrap();
    let dt = to_cspice_string(t);
    lock.str2et(dt.as_str())
}

#[allow(dead_code)]
pub fn solar_time(
    sl_mutex: Arc<Mutex<SpiceLock>>,
    t: OffsetDateTime,
    pos: types::Position,
    )
     -> Result<String, ()>
{
    let lock = sl_mutex.lock().unwrap();
    let lon = pos.to_radians().lon;
    let dt = to_cspice_string(t);
    let et:f64 = lock.str2et(dt.as_str());

    println!("et: {}", et);
    println!("lon: {}", lon);
    let result:String;
    unsafe
    {
        let et_c = et as f64;
        let body_c = 301 as i32;
        let lon_c = lon as f64;
        let type_of_coord = "PLANETOCENTRIC"; 
        let type_c = cstr!(type_of_coord);
        const TIMLEN_C:i32 = 256 as i32;
        const AMPMLEN_C:i32 = 256 as i32;
        let mut hr_c:i32 = 0;
        let hr_cp = &mut hr_c as *mut i32;
        let mut mn_c:i32 = 0;
        let mn_cp = &mut mn_c as *mut i32;
        let mut sc_c:i32 = 0;
        let sc_cp = &mut sc_c as *mut i32;
        //make a buffer for the time string
        let mut time_c = [0i8; TIMLEN_C as usize];
        let mut ampm_c = [0i8; AMPMLEN_C as usize];
        spice::c::et2lst_c(
            et_c, 
            body_c, 
            lon_c,
            type_c,
            TIMLEN_C,
            AMPMLEN_C,
            hr_cp,
            mn_cp,
            sc_cp,
            time_c.as_mut_ptr(),
            ampm_c.as_mut_ptr()
            );
        let time = CStr::from_ptr(time_c.as_ptr()).to_str().unwrap();
        let ampm = CStr::from_ptr(ampm_c.as_ptr()).to_str().unwrap();
        println!("solar time: {} {}", time, ampm);
        //cleanup
        result = format!("{}", ampm);
    }
    Ok(result)
}

#[allow(dead_code)]
pub fn solar_azel( 
    sl_mutex: Arc<Mutex<SpiceLock>>,
    time : OffsetDateTime,
    pos: types::Position,
    ) -> types::RAzEl
{
    let lock = sl_mutex.lock().unwrap();
    let time = to_cspice_string(time);

    let mut radius = [0.0, 0.0, 0.0];

    unsafe{
        //TODO bodvrd_c should not borrow mutable strings here - can we upstream a fix?
        let mut out_dim: i32 = 0;
        let out_dim_p = &mut out_dim as *mut i32;
        spice::c::bodvrd_c(
            cstr!("MOON"),
            cstr!("RADII"),
            3, 
            out_dim_p, 
            radius.as_mut_ptr());
    }

    let re = radius[0];
    println!("re: {}", re);
    let et = lock.str2et(time.as_str());
    println!("et: {}", et);
    let flat = radius[0] - radius[2];
    let flat = flat / radius[0];


    let pos = pos.to_radians();
    println!("pos: {}", serde_json::to_string(&pos).unwrap_or("err".to_string()));
    let mut rect_coord = lock.georec(pos.lon, pos.lat, pos.alt, re, flat);
    println!("rect_coord: {:?}", rect_coord);
    let mut azlsta = [0.0;6];
    let mut lt = 0.0;

    unsafe{

        spice::c::azlcpo_c(
            cstr!("ELLIPSOID"),
            cstr!("SUN"),
            et,
            cstr!("NONE"), //TODO: provide aberration correction
            spice::c::SPICETRUE as i32,
            spice::c::SPICETRUE as i32,
            rect_coord.as_mut_ptr(),
            cstr!("MOON"),
            cstr!("MOON_ME_DE440_ME421"),
            azlsta.as_mut_ptr(),
            &mut lt
            );
    }

    println!("azlsta: {:?} lt: {:?}", azlsta, lt);
    let range = azlsta[0];
    let azimuth = azlsta[1];
    let elevation = azlsta[2];
    println!("range: {} azimuth: {} elevation: {} in degrees", 
             range, 
             azimuth.to_degrees(),
             elevation.to_degrees());
    println!("range: {} azimuth: {} elevation: {} in radians", 
             range, 
             azimuth,
             elevation);

    types::RAzEl{
        r:range, 
        az:azimuth,
        el:elevation,
        units: types::UnitSpecifier::Radians
    }
}