/*
Copyright (C) 2012-23 Miranda NG team (https://miranda-ng.org)

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation version 2
of the License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/

#include "stdafx.h"

void __cdecl CSteamProto::ServerThread(void *)
{
	// load web socket servers first if needed
	int iTimeDiff = db_get_dw(0, STEAM_MODULE, DBKEY_HOSTS_DATE);
	int iHostCount = db_get_dw(0, STEAM_MODULE, DBKEY_HOSTS_COUNT);
	if (!iHostCount || time(0) - iTimeDiff > 3600 * 24 * 7) { // once a week
		if (!SendRequest(new GetHostsRequest(), &CSteamProto::OnGotHosts)) {
			LoginFailed();
			return;
		}
	}

	srand(time(0));
	m_hServerConn = nullptr;

	CMStringA szHost;
	do {
		szHost.Format("Host%d", rand() % iHostCount);
		szHost = db_get_sm(0, STEAM_MODULE, szHost);
		szHost.Insert(0, "wss://");
		szHost += "/cmsocket/";
	}
	while (ServerThreadStub(szHost));
}

bool CSteamProto::ServerThreadStub(const char *szHost)
{
	NLHR_PTR pReply(WebSocket_Connect(m_hNetlibUser, szHost));
	if (pReply == nullptr) {
		debugLogA("websocket connection failed");
		return false;
	}

	if (pReply->resultCode != 101) {
		debugLogA("websocket connection failed: %d", pReply->resultCode);
		return false;
	}

	m_hServerConn = pReply->nlc;
	debugLogA("Websocket connection succeeded");

	// Send init packets
	Login();

	bool bExit = false;
	int offset = 0;
	MBinBuffer netbuf;

	while (!bExit) {
		if (m_bTerminated)
			break;

		unsigned char buf[2048];
		int bufSize = Netlib_Recv(m_hServerConn, (char *)buf + offset, _countof(buf) - offset, 0);
		if (bufSize == 0) {
			debugLogA("Gateway connection gracefully closed");
			bExit = !m_bTerminated;
			break;
		}
		if (bufSize < 0) {
			debugLogA("Gateway connection error, exiting");
			break;
		}

		WSHeader hdr;
		if (!WebSocket_InitHeader(hdr, buf, bufSize)) {
			offset += bufSize;
			continue;
		}
		offset = 0;

		debugLogA("Got packet: buffer = %d, opcode = %d, headerSize = %d, final = %d, masked = %d", bufSize, hdr.opCode, hdr.headerSize, hdr.bIsFinal, hdr.bIsMasked);

		// we have some additional data, not only opcode
		if ((size_t)bufSize > hdr.headerSize) {
			size_t currPacketSize = bufSize - hdr.headerSize;
			netbuf.append(buf, bufSize);
			while (currPacketSize < hdr.payloadSize) {
				int result = Netlib_Recv(m_hServerConn, (char *)buf, _countof(buf), 0);
				if (result == 0) {
					debugLogA("Gateway connection gracefully closed");
					bExit = !m_bTerminated;
					break;
				}
				if (result < 0) {
					debugLogA("Gateway connection error, exiting");
					break;
				}
				currPacketSize += result;
				netbuf.append(buf, result);
			}
		}

		// read all payloads from the current buffer, one by one
		size_t prevSize = 0;
		while (true) {
			switch (hdr.opCode) {
			case 0: // text packet
			case 1: // binary packet
			case 2: // continuation
				if (hdr.bIsFinal) {
					// process a packet here
					CMStringA szJson((char *)netbuf.data() + hdr.headerSize, (int)hdr.payloadSize);
					debugLogA("JSON received:\n%s", szJson.c_str());
					JSONNode root = JSONNode::parse(szJson);
	//				if (root)
//						bExit = ProcessMessage(root);
				}
				break;

			case 8: // close
				debugLogA("server required to exit");
				bExit = true; // simply reconnect, don't exit
				break;

			case 9: // ping
				debugLogA("ping received");
				Netlib_Send(m_hServerConn, (char *)buf + hdr.headerSize, bufSize - int(hdr.headerSize), 0);
				break;
			}

			if (hdr.bIsFinal)
				netbuf.remove(hdr.headerSize + hdr.payloadSize);

			if (netbuf.length() == 0)
				break;

			// if we have not enough data for header, continue reading
			if (!WebSocket_InitHeader(hdr, netbuf.data(), netbuf.length()))
				break;

			// if we have not enough data for data, continue reading
			if (hdr.headerSize + hdr.payloadSize > netbuf.length())
				break;

			debugLogA("Got inner packet: buffer = %d, opcode = %d, headerSize = %d, payloadSize = %d, final = %d, masked = %d", netbuf.length(), hdr.opCode, hdr.headerSize, hdr.payloadSize, hdr.bIsFinal, hdr.bIsMasked);
			if (prevSize == netbuf.length()) {
				netbuf.remove(prevSize);
				debugLogA("dropping current packet, exiting");
				break;
			}

			prevSize = netbuf.length();
		}
	}

	Netlib_CloseHandle(m_hServerConn);
	m_hServerConn = nullptr;
	return bExit;
}