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//! The RFC 959 Data Port (`PORT`) command
//
// The argument is a HOST-PORT specification for the data port
// to be used in data connection.  There are defaults for both
// the user and server data ports, and under normal
// circumstances this command and its reply are not needed.  If
// this command is used, the argument is the concatenation of a
// 32-bit internet host address and a 16-bit TCP port address.
// This address information is broken into 8-bit fields and the
// value of each field is transmitted as a decimal number (in
// character string representation).  The fields are separated
// by commas.  A port command would be:
//
// PORT h1,h2,h3,h4,p1,p2
//
// where h1 is the high order 8 bits of the internet host
// address.

use crate::{
    auth::UserDetail,
    server::controlchan::{
        error::ControlChanError,
        handler::{CommandContext, CommandHandler},
        Reply, ReplyCode,
    },
    storage::{Metadata, StorageBackend},
};
use async_trait::async_trait;

#[derive(Debug)]
pub struct Port;

#[async_trait]
impl<Storage, User> CommandHandler<Storage, User> for Port
where
    User: UserDetail + 'static,
    Storage: StorageBackend<User> + 'static,
    Storage::Metadata: Metadata,
{
    #[tracing_attributes::instrument]
    async fn handle(&self, _args: CommandContext<Storage, User>) -> Result<Reply, ControlChanError> {
        Ok(Reply::new(
            ReplyCode::CommandNotImplemented,
            "ACTIVE mode is not supported - use PASSIVE instead",
        ))
    }
}