this_algorithm/tests/algorithm.rs

use std::str::FromStr;

use common::test_events;
use s2::cellid::CellID;
use xpin::Error;
use xpin::{Address, CELLID_LEVEL};
#[macro_use]
mod common;
use common::approx_geodetic_difference_m;
use common::ALLOWED_DISTANCE_ERROR_M;
use common::CELLID_LEVEL_23_BITMASK;
use common::CELLID_LEVEL_23_END_BIT;

#[test]
fn test_invalid_lat_lon() {
    // Latitudes/longitudes are wrapped, so this is okay
    assert!(Address::from_lat_lon(1.0_f64, 400.0_f64).is_ok());
    assert_eq!(
        Address::from_lat_lon(f64::INFINITY, 400.0_f64),
        Err(Error::NaNLatLng)
    );
    assert_eq!(
        Address::from_lat_lon(1.0_f64, f64::NAN),
        Err(Error::NaNLatLng)
    );
}

#[test]
fn test_decoding_lat_lon() {
    let mut max_error_m = f64::MIN;
    let mut min_error_m = f64::MAX;
    for (idx, entry) in test_events().iter().enumerate() {
        eprintln!("Testing row {idx}");

        let addr = Address::from_lat_lon(entry.lat, entry.lon).unwrap();
        let addr_latlon = addr.as_lat_lon();

        // The difference between the input lat/lon and the encoded-then-decoded lat/lon
        // This distance is essentially the error
        // If you pick a point on the map, this is how far off the encoded point actually represents
        let difference_m = approx_geodetic_difference_m(addr_latlon, (entry.lat, entry.lon));

        // Compute the max and min differences for fun
        if difference_m > max_error_m {
            eprintln!("Setting max to {difference_m}");
            max_error_m = difference_m;
        }
        if difference_m < min_error_m {
            min_error_m = difference_m;
        }

        eprintln!("Distance in meters: {:?}", difference_m);

        // Ensure the distance is not more than the allowed distance
        assert!(difference_m <= ALLOWED_DISTANCE_ERROR_M);

        // assert_eq!((entry.lat, entry.lon), (latlon.0, latlon.1));
    }
    eprintln!("Got max: {max_error_m} and min: {min_error_m}");
}

#[test]
fn test_cellid_translation() {
    for (idx, entry) in test_events().iter().enumerate() {
        eprintln!("Testing row {idx}");

        let addr = Address::from_lat_lon(entry.lat, entry.lon).unwrap();
        let addr_cellid = addr.as_cellid();

        eprintln!(
            "Entry: ({},{}) => {:0>64b}",
            entry.lat, entry.lon, entry.cellid
        );
        eprintln!("\taddr: {addr}");

        // Make sure the rust s2 implementation is accurate
        assert_eq!(entry.cellid, CellID(entry.cellid).0);
        assert_eq!(
            (entry.cellid & CELLID_LEVEL_23_BITMASK) | CELLID_LEVEL_23_END_BIT,
            CellID(entry.cellid).parent(CELLID_LEVEL).0
        );

        // Make sure the address is at the right level
        assert_eq!(addr_cellid.level(), CELLID_LEVEL);

        // Next, check if creating an address from a cellid matches itself
        assert_eq!(addr, Address::from_cellid_u64(entry.cellid));
        assert_eq!(
            addr_cellid,
            Address::from_cellid_u64(entry.cellid).as_cellid()
        );

        // Now check if the actual cell id matches
        assert_eq_u64!(addr_cellid.0, CellID(entry.cellid).parent(CELLID_LEVEL).0);
    }
}

#[test]
fn test_encoding() {
    for (_idx, entry) in test_events().iter().enumerate() {
        let addr = Address::from_lat_lon(entry.lat, entry.lon).unwrap();
        eprintln!("({}, {}) => {addr}", entry.lat, entry.lon);
    }
    // TODO:
    // assert!(false);
}

#[test]
fn test_decoding() {}