/*
 * 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 "connection.hpp"

#include <iostream>

namespace BluCat::NET
{

void
Connection::read_header()
{
	asio::async_read(
		this->socket, asio::buffer(
			&this->reading_message.header, sizeof(MessageHeader)),
		[this](std::error_code error, std::size_t length)
		{
			if(!error)
			{
				if(this->reading_message.header.size > 0)
				{
					this->reading_message.body.resize(this->reading_message.header.size);
					this->read_body();
				}
				else
				{
					this->reading_message.body.resize(0);
					this->messages.push_back(this->reading_message);
					this->read_header();
				}
			}
			else
			{
				std::cout << "Failed to read header: " << error.message() << std::endl;
				this->connection_callback->disconnect(this->index);
			}
		});
}

void
Connection::read_body()
{
	asio::async_read(
		this->socket, asio::buffer(
			this->reading_message.body.data(), this->reading_message.body.size()),
		[this](std::error_code error, std::size_t length)
		{
			if(!error)
			{
				this->messages.push_back(this->reading_message);
				this->read_header();
			}
			else
			{
				std::cout << "Failed to read body." << std::endl;
				this->connection_callback->disconnect(this->index);
			}
		});
}

bool
Connection::send(const uint32_t id, const std::vector<uint8_t> &msg)
{
	std::vector<uint8_t> *buffered_msg =
		new std::vector<uint8_t>(msg.size() + 8);

	{ // Create header
		std::memcpy(buffered_msg->data(), &id, 4);

		uint32_t size{static_cast<uint32_t>(msg.size())};
		std::memcpy(buffered_msg->data() + 4, &size, 4);
	}

	// Append string to buffer.
	copy(msg.begin(), msg.end(), buffered_msg->begin() + 8);

	asio::async_write(
		this->socket, asio::buffer(buffered_msg->data(), buffered_msg->size()),
		[this, buffered_msg](std::error_code error, std::size_t length)
		{
			if(error)
			{
				std::cout << "Failed to send message: " << error.message() <<
					std::endl;
				this->connection_callback->disconnect(this->index);
			}
			delete buffered_msg;
		});

	return true;
}

bool
Connection::read_message(Message *m)
{
	if(this->messages.size() <= 0) return false;

	*m = std::move(this->messages.pop_back());
	return true;
}

Connection::Connection(
	ConnectionCallback *connection_callback,
	asio::io_context &io_context, asio::ip::tcp::socket socket,
	unsigned long index):
	connection_callback{connection_callback},
	io_context{io_context},
	socket{std::move(socket)},
	index{index}
{
	this->read_header();
}

Connection::~Connection()
{
	this->socket.close();
}

}