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use std::num::NonZeroU8;

use crate::{
    error::AUTDInternalError,
    firmware::operation::{write_to_tx, Operation, TypeTag},
    geometry::Device,
};

use super::{SILENCER_FLAG_PULSE_WIDTH, SILENCER_FLAG_STRICT_MODE};

#[repr(C, align(2))]
struct SilencerFixedCompletionSteps {
    tag: TypeTag,
    flag: u8,
    value_intensity: u8,
    value_phase: u8,
}

pub struct SilencerFixedCompletionStepsOp {
    is_done: bool,
    value_intensity: NonZeroU8,
    value_phase: NonZeroU8,
    strict_mode: bool,
    target: super::SilencerTarget,
}

impl SilencerFixedCompletionStepsOp {
    pub const fn new(
        value_intensity: NonZeroU8,
        value_phase: NonZeroU8,
        strict_mode: bool,
        target: super::SilencerTarget,
    ) -> Self {
        Self {
            is_done: false,
            value_intensity,
            value_phase,
            strict_mode,
            target,
        }
    }
}

impl Operation for SilencerFixedCompletionStepsOp {
    fn pack(&mut self, _: &Device, tx: &mut [u8]) -> Result<usize, AUTDInternalError> {
        write_to_tx(
            SilencerFixedCompletionSteps {
                tag: TypeTag::Silencer,
                flag: if self.strict_mode {
                    SILENCER_FLAG_STRICT_MODE
                } else {
                    0
                } | match self.target {
                    super::SilencerTarget::Intensity => 0,
                    super::SilencerTarget::PulseWidth => SILENCER_FLAG_PULSE_WIDTH,
                },
                value_intensity: self.value_intensity.get(),
                value_phase: self.value_phase.get(),
            },
            tx,
        );

        self.is_done = true;
        Ok(std::mem::size_of::<SilencerFixedCompletionSteps>())
    }

    fn required_size(&self, _: &Device) -> usize {
        std::mem::size_of::<SilencerFixedCompletionSteps>()
    }

    fn is_done(&self) -> bool {
        self.is_done
    }
}

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

    use super::*;
    use crate::firmware::operation::SilencerTarget;
    use crate::geometry::tests::create_device;

    const NUM_TRANS_IN_UNIT: usize = 249;

    #[rstest::rstest]
    #[test]
    #[case(SILENCER_FLAG_STRICT_MODE, true)]
    #[cfg_attr(miri, ignore)]
    #[case(0x00, false)]
    fn test(#[case] value: u8, #[case] strict_mode: bool) {
        let device = create_device(0, NUM_TRANS_IN_UNIT);

        let mut tx = [0x00u8; size_of::<SilencerFixedCompletionSteps>()];

        let mut op = SilencerFixedCompletionStepsOp::new(
            NonZeroU8::new(0x12).unwrap(),
            NonZeroU8::new(0x34).unwrap(),
            strict_mode,
            SilencerTarget::Intensity,
        );

        assert_eq!(
            op.required_size(&device),
            size_of::<SilencerFixedCompletionSteps>()
        );
        assert!(!op.is_done());

        assert!(op.pack(&device, &mut tx).is_ok());

        assert!(op.is_done());

        assert_eq!(tx[0], TypeTag::Silencer as u8);
        assert_eq!(tx[1], value);
        assert_eq!(tx[2], 0x12);
        assert_eq!(tx[3], 0x34);
    }
}