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/*
 * File: mod.rs
 * Project: directivity
 * Created Date: 08/10/2023
 * Author: Shun Suzuki
 * -----
 * Last Modified: 01/12/2023
 * Modified By: Shun Suzuki (suzuki@hapis.k.u-tokyo.ac.jp)
 * -----
 * Copyright (c) 2023 Shun Suzuki. All rights reserved.
 *
 */

mod sphere;
mod t4010a1;

use crate::{
    defined::float,
    geometry::{Transducer, Vector3},
};

pub use sphere::Sphere;
pub use t4010a1::T4010A1;

/// Directivity
pub trait Directivity: Send + Sync {
    fn directivity(theta_deg: float) -> float;
    fn directivity_from_tr(tr: &Transducer, target: &Vector3) -> float {
        let dir = tr.z_direction();
        Self::directivity(
            (dir.cross(target).norm())
                .atan2(dir.dot(target))
                .to_degrees(),
        )
    }
}

#[cfg(test)]
pub mod tests {
    use super::*;

    use crate::geometry::UnitQuaternion;

    pub struct TestDirectivity {}

    impl Directivity for TestDirectivity {
        fn directivity(t: float) -> float {
            t
        }
    }

    #[test]
    fn directivity_from_tr() {
        let tr = crate::geometry::Transducer::new(0, Vector3::zeros(), UnitQuaternion::identity());

        assert_approx_eq::assert_approx_eq!(
            0.,
            TestDirectivity::directivity_from_tr(&tr, &tr.z_direction())
        );
        assert_approx_eq::assert_approx_eq!(
            90.,
            TestDirectivity::directivity_from_tr(&tr, &tr.x_direction())
        );
    }
}