use crate::records::memory::connections::CONNECTIONS;
use crate::records::memory::enums::{ClientType, ConnectionType};
use crate::records::memory::response_channels::Command;
use crate::records::memory::structs::StoreConnectionParams;
use crate::Arc;
use crate::AsyncWriteExt;
use crate::Mutex;
use crate::TcpStream;

fn split_ip_port_key(value: &str) -> Option<(String, u16)> {
    // Use rsplit_once so IPv4 host:port values work normally and IPv6
    // bracketed addresses can keep their internal colons.
    let (ip_part, port_part) = value.rsplit_once(':')?;
    let ip = ip_part
        .strip_prefix('[')
        .and_then(|inner| inner.strip_suffix(']'))
        .unwrap_or(ip_part)
        .to_string();
    let port = port_part.parse::<u16>().ok()?;
    Some((ip, port))
}

// write an incoming connection to memory
// client type defines if connection
// is another node or a client connecting
// to use rpc services
pub async fn write_to_memory(
    received_ip_port: &str,
    stream: Arc<Mutex<TcpStream>>,
    client_type: &str,
    wallet_public_key: Vec<u8>,
    command_map: Arc<Mutex<Command>>,
) -> String {
    // Reject unknown connection labels before the connection manager is
    // locked so invalid handshakes do not touch shared state.
    let Ok(client_type) = client_type.parse::<ClientType>() else {
        return "false".to_string();
    };

    let mut connection_instance = CONNECTIONS.write().await;
    if let Some(mut connection) = connection_instance.take() {
        // The connection manager stores IP and port separately because
        // connection direction is tracked in the key alongside them.
        let Some((ip, port)) = split_ip_port_key(received_ip_port) else {
            *connection_instance = Some(connection);
            return "false".to_string();
        };

        let added = connection.store_connection(StoreConnectionParams {
            connection_type: ConnectionType::Incoming,
            ip: ip.clone(),
            port,
            stream: stream.clone(),
            client_type,
            wallet_public_key,
            command_map,
        });

        *connection_instance = Some(connection);
        if added {
            // Return the original ip:port string as the connection key
            // used by stream readers and cleanup paths.
            drop(connection_instance);
            received_ip_port.to_string()
        } else {
            // Duplicate streams are told why they are being closed before
            // the socket is shut down.
            drop(connection_instance);
            let duplicate_message =
                "The connection is already in the connection manager Please wait 10 minutes and try again";
            let mut stream_guard = stream.lock().await;
            let _ = stream_guard.write_all(duplicate_message.as_bytes()).await;
            let _ = stream_guard.flush().await;
            let _ = stream_guard.shutdown().await;
            "false".to_string()
        }
    } else {
        "false".to_string()
    }
}

// delete a connection from memory
pub async fn remove_key_from_memory(key: &str) {
    let mut connection_instance = CONNECTIONS.write().await;
    // A key can represent either direction, so cleanup removes both
    // incoming and outgoing entries with the same endpoint.
    let Some((ip, port)) = split_ip_port_key(key) else {
        return;
    };
    if let Some(connection) = connection_instance.as_mut() {
        connection.drop_connection(ConnectionType::Incoming, ip.clone(), port);
        connection.drop_connection(ConnectionType::Outgoing, ip, port);
    }
}

pub async fn remove_stream_from_memory(stream: &Arc<Mutex<TcpStream>>) {
    let mut connection_instance = CONNECTIONS.write().await;
    let Some(connection) = connection_instance.as_mut() else {
        return;
    };

    // Stream cleanup is used when only the socket handle is known, so
    // search the connection map for the matching Arc before dropping it.
    let matching_connection =
        connection
            .connection_map
            .iter()
            .find_map(|(connection_key, connection_info)| {
                let connection_type = ConnectionType::from_bytes(&connection_key.connection_type)?;
                if Arc::ptr_eq(&connection_info.stream, stream) {
                    Some((
                        connection_type,
                        connection_key.ip.clone(),
                        connection_key.port,
                    ))
                } else {
                    None
                }
            });

    if let Some((connection_type, ip_bytes, port)) = matching_connection {
        let ip = crate::common::binary_conversions::binary_to_ip(ip_bytes);
        connection.drop_connection(connection_type, ip, port);
    }
}