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use crate::{
    error::AUTDInternalError,
    firmware::{
        fpga::PWE_BUF_SIZE,
        operation::{cast, Operation, TypeTag},
    },
    geometry::{Device, Geometry},
};

use super::Remains;

#[derive(Clone, Copy)]
#[repr(C)]
pub struct PWEControlFlags(u8);

bitflags::bitflags! {
    impl PWEControlFlags : u8 {
        const NONE  = 0;
        const BEGIN = 1 << 0;
        const END   = 1 << 1;
    }
}

#[repr(C, align(2))]
struct PWEHead {
    tag: TypeTag,
    flag: PWEControlFlags,
    size: u16,
    full_width_start: u16,
}

#[repr(C, align(2))]
struct PWESubseq {
    tag: TypeTag,
    flag: PWEControlFlags,
    size: u16,
}

pub struct PulseWidthEncoderOp {
    buf: Vec<u8>,
    full_width_start: u16,
    remains: Remains,
}

impl PulseWidthEncoderOp {
    pub fn new(buf: Vec<u16>) -> Self {
        let full_width_start = buf
            .iter()
            .enumerate()
            .find(|&(_, v)| *v == 256)
            .map(|v| v.0 as u16)
            .unwrap_or(0xFFFF);
        let buf = buf.into_iter().map(|v| v as u8).collect();
        Self {
            buf,
            full_width_start,
            remains: Default::default(),
        }
    }
}

impl Operation for PulseWidthEncoderOp {
    fn pack(&mut self, device: &Device, tx: &mut [u8]) -> Result<usize, AUTDInternalError> {
        let sent = PWE_BUF_SIZE - self.remains[device];

        let offset = if sent == 0 {
            std::mem::size_of::<PWEHead>()
        } else {
            std::mem::size_of::<PWESubseq>()
        };

        let size = (self.buf.len() - sent).min(tx.len() - offset) & !0x1;
        assert!(size > 0);

        if sent == 0 {
            *cast::<PWEHead>(tx) = PWEHead {
                tag: TypeTag::ConfigPulseWidthEncoder,
                flag: PWEControlFlags::BEGIN,
                size: size as u16,
                full_width_start: self.full_width_start,
            };
        } else {
            *cast::<PWESubseq>(tx) = PWESubseq {
                tag: TypeTag::ConfigPulseWidthEncoder,
                flag: PWEControlFlags::NONE,
                size: size as u16,
            };
        }

        if sent + size == self.buf.len() {
            cast::<PWESubseq>(tx).flag.set(PWEControlFlags::END, true);
        }

        unsafe {
            std::ptr::copy_nonoverlapping(
                self.buf[sent..].as_ptr(),
                tx[offset..].as_mut_ptr() as _,
                size,
            )
        }

        self.remains[device] -= size;
        if sent == 0 {
            Ok(std::mem::size_of::<PWEHead>() + size)
        } else {
            Ok(std::mem::size_of::<PWESubseq>() + size)
        }
    }

    fn required_size(&self, device: &Device) -> usize {
        if self.remains[device] == PWE_BUF_SIZE {
            std::mem::size_of::<PWEHead>() + 2
        } else {
            std::mem::size_of::<PWESubseq>() + 2
        }
    }

    fn init(&mut self, geometry: &Geometry) -> Result<(), AUTDInternalError> {
        if self.buf.len() != PWE_BUF_SIZE {
            return Err(AUTDInternalError::InvalidPulseWidthEncoderTableSize(
                self.buf.len(),
            ));
        }

        self.remains.init(geometry, |_| PWE_BUF_SIZE);

        Ok(())
    }

    fn is_done(&self, device: &Device) -> bool {
        self.remains.is_done(device)
    }
}