#include "HTTPConnection.hpp"

namespace httpsserver {


HTTPConnection::HTTPConnection(ResourceResolver * resResolver):
	_resResolver(resResolver) {
	_socket = -1;
	_addrLen = 0;

	_bufferProcessed = 0;
	_bufferUnusedIdx = 0;

	_connectionState = STATE_UNDEFINED;
	_clientState = CSTATE_UNDEFINED;
	_httpHeaders = NULL;
	_defaultHeaders = NULL;
	_isKeepAlive = false;
	_lastTransmissionTS = millis();
	_shutdownTS = 0;
}

HTTPConnection::~HTTPConnection() {
	// Close the socket
	closeConnection();
}

/**
 * Initializes the connection from a server socket.
 *
 * The call WILL BLOCK if accept(serverSocketID) blocks. So use select() to check for that in advance.
 */
int HTTPConnection::initialize(int serverSocketID, HTTPHeaders *defaultHeaders) {
	if (_connectionState == STATE_UNDEFINED) {
		_defaultHeaders = defaultHeaders;
		_socket = accept(serverSocketID, (struct sockaddr * )&_sockAddr, &_addrLen);

		// Build up SSL Connection context if the socket has been created successfully
		if (_socket >= 0) {
			HTTPS_DLOGHEX("[-->] New connection. Socket fid is: ", _socket);
			_connectionState = STATE_INITIAL;
			_httpHeaders = new HTTPHeaders();
			refreshTimeout();
			return _socket;

		}
     
		HTTPS_DLOG("[ERR] Could not accept() new connection");
   
		_connectionState = STATE_ERROR;
		_clientState = CSTATE_ACTIVE;

		// This will only be called if the connection could not be established and cleanup
		// variables  etc.
		closeConnection();
	}
	// Error: The connection has already been established or could not be established
	return -1;
}


/**
 * True if the connection is timed out.
 *
 * (Should be checkd in the loop and transition should go to CONNECTION_CLOSE if exceeded)
 */
bool HTTPConnection::isTimeoutExceeded() {
	return _lastTransmissionTS + HTTPS_CONNECTION_TIMEOUT < millis();
}

/**
 * Resets the timeout to allow again the full HTTPS_CONNECTION_TIMEOUT milliseconds
 */
void HTTPConnection::refreshTimeout() {
	_lastTransmissionTS = millis();
}

/**
 * Returns true, if the connection has been closed.
 */
bool HTTPConnection::isClosed() {
	return (_connectionState == STATE_ERROR || _connectionState == STATE_CLOSED);
}

/**
 * Returns true, if the connection has been closed due to error
 */
bool HTTPConnection::isError() {
	return (_connectionState == STATE_ERROR);
}

bool HTTPConnection::isSecure() {
	return false;
}

void HTTPConnection::closeConnection() {
	// TODO: Call an event handler here, maybe?

	if (_connectionState != STATE_ERROR && _connectionState != STATE_CLOSED) {

		// First call to closeConnection - set the timestamp to calculate the timeout later on
		if (_connectionState != STATE_CLOSING) {
			_shutdownTS = millis();
		}

		// Set the connection state to closing. We stay in closing as long as SSL has not been shutdown
		// correctly
		_connectionState = STATE_CLOSING;
	}

	// Tear down the socket
	if (_socket >= 0) {
		HTTPS_DLOGHEX("[