/*
 * Copyright 2022-2025 Frederico de Oliveira Linhares
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "server.hpp"

#include <iostream>

namespace BluCat::NET
{

void
Server::wait_for_client_connections()
{
	acceptor.async_accept(
		[this](std::error_code error, asio::ip::tcp::socket socket)
		{
			if(!error)
			{
				std::scoped_lock lock(this->mut);

				std::cout << "[SERVER] New connection: " << socket.remote_endpoint() <<
					std::endl;

				if(this->free_connection_slots.size() > 0)
				{
					unsigned long pos{this->free_connection_slots.pop_front()};
					std::cout << "Working " << pos << std::endl;
					Connection *new_connection = new Connection(
						this->callback_instantiator(), this, this->io_context,
						std::move(socket), pos);
					this->connections[pos] = new_connection;
				}
				else
				{
					unsigned long pos{this->connections.size()};
					Connection *new_connection = new Connection(
						this->callback_instantiator(), this, this->io_context,
						std::move(socket), pos);
					this->connections.push_back(new_connection);
				}
			}
			else
			{
				std::cout << "error connecting to client." << std::endl;
			}

			std::cout << "num clients: " << connections.size() << std::endl;

			this->wait_for_client_connections();
		});
}

void
Server::read_messages()
{
	std::scoped_lock lock(this->mut);
	for(auto i{0}; i < this->connections.size(); i++)
	{
		Connection *c{this->connections[i]};
		if(c != nullptr) c->read_messages();
	}
}

void
Server::end_connection(unsigned long index)
{
	std::scoped_lock lock(this->mut);
	delete this->connections[index];
	this->connections[index] = nullptr;
	this->free_connection_slots.push_back(index);
}

Server::Server(MessageCallback *(*callback_instantiator)(), const uint16_t port):
	callback_instantiator{callback_instantiator},
	acceptor{io_context, asio::ip::tcp::endpoint(asio::ip::tcp::v4(), port)}
{
	this->thread_context = std::thread([this](){this->io_context.run();});
	this->wait_for_client_connections();
}

Server::~Server()
{
	this->connections.clear();
	this->io_context.stop();
	if(this->thread_context.joinable()) thread_context.join();
}

}