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use crate::common::Drive;

#[derive(Clone, Copy)]
#[repr(C)]
pub struct FPGADrive {
    pub phase: u8,
    pub intensity: u8,
}

impl FPGADrive {
    pub fn set(&mut self, d: &Drive) {
        self.intensity = d.intensity.value();
        self.phase = d.phase.value();
    }
}

#[cfg(test)]
mod tests {
    use std::mem::size_of;

    use super::*;
    use crate::{
        common::{EmitIntensity, Phase},
        defined::PI,
    };

    #[test]
    fn drive() {
        assert_eq!(size_of::<FPGADrive>(), 2);

        let d = FPGADrive {
            phase: 0x01,
            intensity: 0x02,
        };
        let dc = Clone::clone(&d);
        assert_eq!(d.phase, dc.phase);
        assert_eq!(d.intensity, dc.intensity);

        let mut d = [0x00u8; 2];

        unsafe {
            let s = Drive::null();
            (*(&mut d as *mut _ as *mut FPGADrive)).set(&s);
            assert_eq!(d[0], 0x00);
            assert_eq!(d[1], 0x00);

            let s = Drive {
                phase: Phase::from_rad(PI),
                intensity: EmitIntensity::new(84),
            };
            (*(&mut d as *mut _ as *mut FPGADrive)).set(&s);
            assert_eq!(d[0], 128);
            assert_eq!(d[1], 84);

            let s = Drive {
                phase: Phase::from_rad(2.0 * PI),
                intensity: EmitIntensity::MAX,
            };
            (*(&mut d as *mut _ as *mut FPGADrive)).set(&s);
            assert_eq!(d[0], 0x00);
            assert_eq!(d[1], 0xFF);

            let s = Drive {
                phase: Phase::from_rad(3.0 * PI),
                intensity: EmitIntensity::MAX,
            };
            (*(&mut d as *mut _ as *mut FPGADrive)).set(&s);
            assert_eq!(d[0], 128);
            assert_eq!(d[1], 0xFF);

            let s = Drive {
                phase: Phase::from_rad(-PI),
                intensity: EmitIntensity::MIN,
            };
            (*(&mut d as *mut _ as *mut FPGADrive)).set(&s);
            assert_eq!(d[0], 128);
            assert_eq!(d[1], 0);
        }
    }
}