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use std::{collections::HashMap, fmt};

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

#[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;
    }
}

impl fmt::Display for PWEControlFlags {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let mut flags = Vec::new();
        if self.contains(PWEControlFlags::BEGIN) {
            flags.push("BEGIN")
        }
        if self.contains(PWEControlFlags::END) {
            flags.push("END")
        }
        if self.is_empty() {
            flags.push("NONE")
        }
        write!(
            f,
            "{}",
            flags
                .iter()
                .map(|s| s.to_string())
                .collect::<Vec<_>>()
                .join(" | ")
        )
    }
}

#[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 ConfigurePulseWidthEncoderOp {
    buf: Vec<u8>,
    full_width_start: u16,
    remains: HashMap<usize, usize>,
    sent: HashMap<usize, usize>,
}

impl ConfigurePulseWidthEncoderOp {
    pub fn new(buf: Vec<u8>, full_width_start: u16) -> Self {
        Self {
            buf,
            full_width_start,
            remains: HashMap::new(),
            sent: HashMap::new(),
        }
    }
}

impl Operation for ConfigurePulseWidthEncoderOp {
    fn pack(&mut self, device: &Device, tx: &mut [u8]) -> Result<usize, AUTDInternalError> {
        assert!(self.remains[&device.idx()] > 0);

        let sent = self.sent[&device.idx()];

        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 {
            let d = cast::<PWEHead>(tx);
            d.tag = TypeTag::ConfigPulseWidthEncoder;
            d.flag = PWEControlFlags::BEGIN;
            d.size = size as u16;
            d.full_width_start = self.full_width_start;
        } else {
            let d = cast::<PWESubseq>(tx);
            d.tag = TypeTag::ConfigPulseWidthEncoder;
            d.flag = PWEControlFlags::NONE;
            d.size = size as u16;
        }

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

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

        self.sent.insert(device.idx(), sent + 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.sent[&device.idx()] == 0 {
            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() != 65536 {
            return Err(AUTDInternalError::InvalidPulseWidthEncoderTableSize(
                self.buf.len(),
            ));
        }

        self.remains = geometry
            .devices()
            .map(|device| (device.idx(), self.buf.len()))
            .collect();
        self.sent = geometry.devices().map(|device| (device.idx(), 0)).collect();

        Ok(())
    }

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

    fn commit(&mut self, device: &Device) {
        self.remains
            .insert(device.idx(), self.buf.len() - self.sent[&device.idx()]);
    }
}