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/*
 * File: sync.rs
 * Project: operation
 * Created Date: 08/01/2023
 * Author: Shun Suzuki
 * -----
 * Last Modified: 09/11/2023
 * Modified By: Shun Suzuki (suzuki@hapis.k.u-tokyo.ac.jp)
 * -----
 * Copyright (c) 2023 Shun Suzuki. All rights reserved.
 *
 */

use std::collections::HashMap;

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

#[derive(Default)]
pub struct SyncOp {
    remains: HashMap<usize, usize>,
}

impl Operation for SyncOp {
    fn pack(&mut self, device: &Device, tx: &mut [u8]) -> Result<usize, AUTDInternalError> {
        assert_eq!(self.remains[&device.idx()], 1);

        assert!(tx.len() >= 2 + device.num_transducers() * std::mem::size_of::<u16>());

        tx[0] = TypeTag::Sync as u8;

        unsafe {
            let dst = std::slice::from_raw_parts_mut(
                tx[2..].as_mut_ptr() as *mut u16,
                device.num_transducers(),
            );
            dst.fill(0x1000); // for v3 firmware compatibility
        }

        Ok(2 + device.num_transducers() * std::mem::size_of::<u16>())
    }

    fn required_size(&self, device: &Device) -> usize {
        2 + device.num_transducers() * std::mem::size_of::<u16>()
    }

    fn init(&mut self, geometry: &Geometry) -> Result<(), AUTDInternalError> {
        self.remains = geometry.devices().map(|device| (device.idx(), 1)).collect();
        Ok(())
    }

    fn remains(&self, device: &Device) -> usize {
        self.remains[&device.idx()]
    }

    fn commit(&mut self, device: &Device) {
        self.remains.insert(device.idx(), 0);
    }
}

#[cfg(test)]
mod tests {

    use super::*;
    use crate::geometry::tests::create_geometry;

    const NUM_TRANS_IN_UNIT: usize = 249;
    const NUM_DEVICE: usize = 10;

    #[test]
    fn sync_op() {
        let geometry = create_geometry(NUM_DEVICE, NUM_TRANS_IN_UNIT);

        let mut tx =
            vec![0x00u8; (2 + NUM_TRANS_IN_UNIT * std::mem::size_of::<u16>()) * NUM_DEVICE];

        let mut op = SyncOp::default();

        assert!(op.init(&geometry).is_ok());

        geometry.devices().for_each(|dev| {
            assert_eq!(
                op.required_size(dev),
                2 + NUM_TRANS_IN_UNIT * std::mem::size_of::<u16>()
            )
        });

        geometry
            .devices()
            .for_each(|dev| assert_eq!(op.remains(dev), 1));

        geometry.devices().for_each(|dev| {
            assert!(op
                .pack(
                    dev,
                    &mut tx[dev.idx() * (2 + NUM_TRANS_IN_UNIT * std::mem::size_of::<u16>())..]
                )
                .is_ok());
            op.commit(dev);
        });

        geometry
            .devices()
            .for_each(|dev| assert_eq!(op.remains(dev), 0));

        geometry.devices().for_each(|dev| {
            assert_eq!(
                tx[dev.idx() * (2 + NUM_TRANS_IN_UNIT * std::mem::size_of::<u16>())],
                TypeTag::Sync as u8
            );
            tx.chunks(2)
                .skip((1 + NUM_TRANS_IN_UNIT) * dev.idx())
                .skip(1)
                .take(NUM_TRANS_IN_UNIT)
                .for_each(|d| {
                    assert_eq!(d[0], 0x00);
                    assert_eq!(d[1], 0x10);
                })
        });
    }
}