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// use crate::builder::BackendType;
// use crate::network::cqc::cqc::*;
// use crate::network::network::QuantumNetwork;
// use crate::state::Gate1Q;
// use std::collections::HashMap;
// use std::mem;
// use std::sync::Arc;
// use tokio::io::{AsyncReadExt, AsyncWriteExt};
// use tokio::net::{TcpListener, TcpStream};
// use tokio::sync::Mutex;
// // Import CQC types from the module
// use super::*;
// pub struct CQCBackend {
// network: Arc<Mutex<QuantumNetwork>>,
// nodes: Arc<Mutex<HashMap<String, CQCNode>>>,
// port: u16,
// }
// pub struct CQCNode {
// pub app_id: u16,
// pub node_name: String,
// pub allocated_qubits: HashMap<u16, usize>, // CQC qubit_id -> network qubit_id
// pub next_qubit_id: u16,
// }
// impl CQCBackend {
// pub async fn new(port: u16) -> Result<Self, Box<dyn std::error::Error>> {
// let network = QuantumNetwork::new_distributed();
// Ok(CQCBackend {
// network: Arc::new(Mutex::new(network)),
// nodes: Arc::new(Mutex::new(HashMap::new())),
// port,
// })
// }
// pub async fn run(&self) -> Result<(), Box<dyn std::error::Error>> {
// let listener = TcpListener::bind(format!("0.0.0.0:{}", self.port)).await?;
// info!("CQC Backend listening on port {}", self.port);
// loop {
// let (socket, addr) = listener.accept().await?;
// info!("New CQC connection from {}", addr);
// let network = self.network.clone();
// let nodes = self.nodes.clone();
// tokio::spawn(async move {
// if let Err(e) = handle_client(socket, network, nodes).await {
// error!("Client error: {}", e);
// }
// });
// }
// }
// }
// async fn handle_client(
// mut socket: TcpStream,
// network: Arc<Mutex<QuantumNetwork>>,
// nodes: Arc<Mutex<HashMap<String, CQCNode>>>,
// ) -> Result<(), Box<dyn std::error::Error>> {
// let mut buffer = vec![0u8; 1024];
// loop {
// // Read CQC Header
// let n = socket.read(&mut buffer[..8]).await?;
// if n == 0 {
// break; // Connection closed
// }
// let header = CQCHeader::from_bytes(&buffer[..8])?;
// // Extract fields to avoid packed struct alignment issues
// let msg_type = header.msg_type;
// let app_id = header.app_id;
// let length = header.length;
// info!(
// "Received CQC message: type={}, app_id={}, length={}",
// msg_type, app_id, length
// );
// // Read rest of message
// if length > 0 {
// socket.read_exact(&mut buffer[..length as usize]).await?;
// }
// // Process message
// let response =
// process_cqc_message(header, &buffer[..length as usize], &network, &nodes).await?;
// // Send response
// for resp_bytes in response {
// socket.write_all(&resp_bytes).await?;
// }
// }
// Ok(())
// }
// async fn process_cqc_message(
// header: CQCHeader,
// payload: &[u8],
// network: &Arc<Mutex<QuantumNetwork>>,
// nodes: &Arc<Mutex<HashMap<String, CQCNode>>>,
// ) -> Result<Vec<Vec<u8>>, Box<dyn std::error::Error>> {
// let mut responses = Vec::new();
// // Extract header fields to avoid alignment issues
// let msg_type = header.msg_type;
// let app_id = header.app_id;
// match msg_type {
// x if x == CQCType::Hello as u8 => {
// // Respond with HELLO
// let resp_header = CQCHeader::new(CQCType::Hello, app_id, 0);
// responses.push(resp_header.to_bytes());
// }
// x if x == CQCType::Command as u8 => {
// // Process command sequence
// let mut offset = 0;
// while offset < payload.len() {
// let cmd_header = CQCCmdHeader::from_bytes(&payload[offset..])?;
// offset += std::mem::size_of::<CQCCmdHeader>();
// // Extract fields to avoid alignment issues
// let qubit_id = cmd_header.qubit_id;
// let instr = cmd_header.instr;
// let options = cmd_header.options;
// match instr {
// x if x == CQCCmd::New as u8 => {
// // Allocate new qubit
// let mut net = network.lock().await;
// let mut nodes_map = nodes.lock().await;
// // Get or create node for this app
// let node_name = format!("app_{}", app_id);
// if !nodes_map.contains_key(&node_name) {
// net.add_distributed_node(&node_name, 100, BackendType::Stabilizer)?;
// nodes_map.insert(node_name.clone(), CQCNode {
// app_id,
// node_name: node_name.clone(),
// allocated_qubits: HashMap::new(),
// next_qubit_id: 0,
// });
// }
// let node = nodes_map.get_mut(&node_name).unwrap();
// let network_qubit = net.allocate_local_qubit(&node_name)?;
// let cqc_qubit_id = node.next_qubit_id;
// node.next_qubit_id += 1;
// node.allocated_qubits.insert(cqc_qubit_id, network_qubit);
// // Send NEW_OK response
// let resp_header = CQCHeader::new(CQCType::NewOk, app_id, 2);
// let qubit_header = CQCXtraQubitHeader {
// qubit_id: cqc_qubit_id,
// };
// responses.push(resp_header.to_bytes());
// responses.push(qubit_header.to_bytes());
// if options & CQC_OPT_NOTIFY != 0 {
// let done_header = CQCHeader::new(CQCType::Done, app_id, 0);
// responses.push(done_header.to_bytes());
// }
// }
// x if x == CQCCmd::H as u8 => {
// // Apply Hadamard
// let mut net = network.lock().await;
// let nodes_map = nodes.lock().await;
// let node_name = format!("app_{}", app_id);
// let node = nodes_map.get(&node_name).ok_or("Node not found")?;
// let network_qubit = node
// .allocated_qubits
// .get(&qubit_id)
// .ok_or("Qubit not found")?;
// net.apply_local_gate(&node_name, *network_qubit, Gate1Q::H)?;
// if options & CQC_OPT_NOTIFY != 0 {
// let done_header = CQCHeader::new(CQCType::Done, app_id, 0);
// responses.push(done_header.to_bytes());
// }
// }
// x if x == CQCCmd::Measure as u8 => {
// // Measure qubit
// let mut net = network.lock().await;
// let nodes_map = nodes.lock().await;
// let node_name = format!("app_{}", app_id);
// let node = nodes_map.get(&node_name).ok_or("Node not found")?;
// let network_qubit = node
// .allocated_qubits
// .get(&qubit_id)
// .ok_or("Qubit not found")?;
// let outcome = net.measure(&node_name, *network_qubit)?;
// // Send MEASOUT response
// let resp_header = CQCHeader::new(CQCType::MeasOut, app_id, 1);
// let meas_header = CQCMeasOutHeader { meas_out: outcome };
// responses.push(resp_header.to_bytes());
// responses.push(meas_header.to_bytes());
// if options & CQC_OPT_NOTIFY != 0 {
// let done_header = CQCHeader::new(CQCType::Done, app_id, 0);
// responses.push(done_header.to_bytes());
// }
// }
// x if x == CQCCmd::X as u8 => {
// // Apply X gate
// let mut net = network.lock().await;
// let nodes_map = nodes.lock().await;
// let node_name = format!("app_{}", app_id);
// let node = nodes_map.get(&node_name).ok_or("Node not found")?;
// let network_qubit = node
// .allocated_qubits
// .get(&qubit_id)
// .ok_or("Qubit not found")?;
// net.apply_local_gate(&node_name, *network_qubit, Gate1Q::X)?;
// if options & CQC_OPT_NOTIFY != 0 {
// let done_header = CQCHeader::new(CQCType::Done, app_id, 0);
// responses.push(done_header.to_bytes());
// }
// }
// x if x == CQCCmd::Z as u8 => {
// // Apply Z gate
// let mut net = network.lock().await;
// let nodes_map = nodes.lock().await;
// let node_name = format!("app_{}", app_id);
// let node = nodes_map.get(&node_name).ok_or("Node not found")?;
// let network_qubit = node
// .allocated_qubits
// .get(&qubit_id)
// .ok_or("Qubit not found")?;
// net.apply_local_gate(&node_name, *network_qubit, Gate1Q::Z)?;
// if options & CQC_OPT_NOTIFY != 0 {
// let done_header = CQCHeader::new(CQCType::Done, app_id, 0);
// responses.push(done_header.to_bytes());
// }
// }
// x if x == CQCCmd::Y as u8 => {
// // Apply Y gate
// let mut net = network.lock().await;
// let nodes_map = nodes.lock().await;
// let node_name = format!("app_{}", app_id);
// let node = nodes_map.get(&node_name).ok_or("Node not found")?;
// let network_qubit = node
// .allocated_qubits
// .get(&qubit_id)
// .ok_or("Qubit not found")?;
// net.apply_local_gate(&node_name, *network_qubit, Gate1Q::Y)?;
// if options & CQC_OPT_NOTIFY != 0 {
// let done_header = CQCHeader::new(CQCType::Done, app_id, 0);
// responses.push(done_header.to_bytes());
// }
// }
// x if x == CQCCmd::T as u8 => {
// // Apply T gate
// let mut net = network.lock().await;
// let nodes_map = nodes.lock().await;
// let node_name = format!("app_{}", app_id);
// let node = nodes_map.get(&node_name).ok_or("Node not found")?;
// let network_qubit = node
// .allocated_qubits
// .get(&qubit_id)
// .ok_or("Qubit not found")?;
// net.apply_local_gate(&node_name, *network_qubit, Gate1Q::T)?;
// if options & CQC_OPT_NOTIFY != 0 {
// let done_header = CQCHeader::new(CQCType::Done, app_id, 0);
// responses.push(done_header.to_bytes());
// }
// }
// x if x == CQCCmd::RotX as u8
// || x == CQCCmd::RotY as u8
// || x == CQCCmd::RotZ as u8 =>
// {
// // Rotation gates need extra header
// if offset + std::mem::size_of::<CQCRotationHeader>() > payload.len() {
// return Err("Missing rotation header".into());
// }
// let rot_header = CQCRotationHeader::from_bytes(&payload[offset..])?;
// offset += std::mem::size_of::<CQCRotationHeader>();
// let angle = (rot_header.step as f64) * std::f64::consts::PI / 128.0;
// let mut net = network.lock().await;
// let nodes_map = nodes.lock().await;
// let node_name = format!("app_{}", app_id);
// let node = nodes_map.get(&node_name).ok_or("Node not found")?;
// let network_qubit = node
// .allocated_qubits
// .get(&qubit_id)
// .ok_or("Qubit not found")?;
// let gate = match instr {
// x if x == CQCCmd::RotX as u8 => Gate1Q::Rx(angle),
// x if x == CQCCmd::RotY as u8 => Gate1Q::Ry(angle),
// x if x == CQCCmd::RotZ as u8 => Gate1Q::Rz(angle),
// _ => unreachable!(),
// };
// net.apply_local_gate(&node_name, *network_qubit, gate)?;
// if options & CQC_OPT_NOTIFY != 0 {
// let done_header = CQCHeader::new(CQCType::Done, app_id, 0);
// responses.push(done_header.to_bytes());
// }
// }
// // Add more commands as needed...
// _ => {
// error!("Unimplemented command: {}", instr);
// let err_header = CQCHeader::new(CQCType::ErrUnsupp, app_id, 0);
// responses.push(err_header.to_bytes());
// }
// }
// }
// }
// _ => {
// error!("Unknown message type: {}", msg_type);
// let err_header = CQCHeader::new(CQCType::ErrGeneral, app_id, 0);
// responses.push(err_header.to_bytes());
// }
// }
// Ok(responses)
// }