// LNP/BP Core Library implementing LNPBP specifications & standards
// Written in 2020 by
//     Dr. Maxim Orlovsky <orlovsky@pandoracore.com>
//
// To the extent possible under law, the author(s) have dedicated all
// copyright and related and neighboring rights to this software to
// the public domain worldwide. This software is distributed without
// any warranty.
//
// You should have received a copy of the MIT License
// along with this software.
// If not, see <https://opensource.org/licenses/MIT>.

use std::fmt::{Debug, Display};

use crate::lnp::presentation::{payload, CreateUnmarshaller, Error};
use crate::lnp::session::{Connect, Session};
use crate::lnp::{LocalNode, ToNodeAddr};

/// Marker trait for LNP RPC requests
pub trait Request:
    Debug + Display + payload::TypedEnum + CreateUnmarshaller
{
}

/// Marker trait for LNP RPC replies
pub trait Reply:
    Debug + Display + payload::TypedEnum + CreateUnmarshaller
{
}

/// RPC API pair, connecting [`Request`] type with [`Reply`]
pub trait Api {
    /// Requests supported by RPC API
    type Request: Request;

    /// Replies supported by RPC API
    type Reply: Reply;
}

pub struct RpcConnection<A>
where
    A: Api,
{
    api: A,
    session: Box<dyn Session>,
}

impl<A> RpcConnection<A>
where
    A: Api,
{
    pub fn connect(
        api: A,
        remote: impl ToNodeAddr,
        local: &LocalNode,
        default_port: u16,
    ) -> Result<Self, Error> {
        let endpoint = remote
            .to_node_addr(default_port)
            .ok_or(Error::InvalidEndpoint)?;
        let session = endpoint.connect(local)?;
        Ok(Self { api, session })
    }

    pub fn accept(
        api: A,
        addr: impl ToNodeAddr,
        node: &LocalNode,
        default_port: u16,
    ) -> Result<Self, Error> {
        let endpoint = addr
            .to_node_addr(default_port)
            .ok_or(Error::InvalidEndpoint)?;
        let session = endpoint.connect(node)?;
        Ok(Self { api, session })
    }
}
