/* Copyright (c) 2013-2014 Jeffrey Pfau
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef SOCKET_H
#define SOCKET_H

#include "util/common.h"

#ifdef __cplusplus
#define restrict __restrict__
#endif

#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>

#define SOCKET_FAILED(s) (s) == INVALID_SOCKET
typedef SOCKET Socket;
#else
#include <fcntl.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/socket.h>

#define INVALID_SOCKET (-1)
#define SOCKET_FAILED(s) (s) < 0
typedef int Socket;
#endif

enum IP {
	IPV4,
	IPV6
};

struct Address {
	enum IP version;
	union {
		uint32_t ipv4;
		uint8_t ipv6[16];
	};
};

static inline void SocketSubsystemInitialize() {
#ifdef _WIN32
	WSAStartup(MAKEWORD(2, 2), 0);
#endif
}

static inline ssize_t SocketSend(Socket socket, const void* buffer, size_t size) {
	return write(socket, buffer, size);
}

static inline ssize_t SocketRecv(Socket socket, void* buffer, size_t size) {
	return read(socket, buffer, size);
}

static inline Socket SocketOpenTCP(int port, const struct Address* bindAddress) {
	Socket sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (SOCKET_FAILED(sock)) {
		return sock;
	}

	int err;
	if (!bindAddress) {
		struct sockaddr_in bindInfo;
		memset(&bindInfo, 0, sizeof(bindInfo));
		bindInfo.sin_family = AF_INET;
		bindInfo.sin_port = htons(port);
		err = bind(sock, (const struct sockaddr*) &bindInfo, sizeof(bindInfo));
	} else if (bindAddress->version == IPV4) {
		struct sockaddr_in bindInfo;
		memset(&bindInfo, 0, sizeof(bindInfo));
		bindInfo.sin_family = AF_INET;
		bindInfo.sin_port = htons(port);
		bindInfo.sin_addr.s_addr = bindAddress->ipv4;
		err = bind(sock, (const struct sockaddr*) &bindInfo, sizeof(bindInfo));
	} else {
		struct sockaddr_in6 bindInfo;
		memset(&bindInfo, 0, sizeof(bindInfo));
		bindInfo.sin6_family = AF_INET6;
		bindInfo.sin6_port = htons(port);
		memcpy(bindInfo.sin6_addr.s6_addr, bindAddress->ipv6, sizeof(bindInfo.sin6_addr.s6_addr));
		err = bind(sock, (const struct sockaddr*) &bindInfo, sizeof(bindInfo));

	}
	if (err) {
		close(sock);
		return -1;
	}
	return sock;
}

static inline Socket SocketConnectTCP(int port, const struct Address* destinationAddress) {
	Socket sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (SOCKET_FAILED(sock)) {
		return sock;
	}

	int err;
	if (!destinationAddress) {
		struct sockaddr_in bindInfo;
		memset(&bindInfo, 0, sizeof(bindInfo));
		bindInfo.sin_family = AF_INET;
		bindInfo.sin_port = htons(port);
		err = connect(sock, (const struct sockaddr*) &bindInfo, sizeof(bindInfo));
	} else if (destinationAddress->version == IPV4) {
		struct sockaddr_in bindInfo;
		memset(&bindInfo, 0, sizeof(bindInfo));
		bindInfo.sin_family = AF_INET;
		bindInfo.sin_port = htons(port);
		bindInfo.sin_addr.s_addr = destinationAddress->ipv4;
		err = connect(sock, (const struct sockaddr*) &bindInfo, sizeof(bindInfo));
	} else {
		struct sockaddr_in6 bindInfo;
		memset(&bindInfo, 0, sizeof(bindInfo));
		bindInfo.sin6_family = AF_INET6;
		bindInfo.sin6_port = htons(port);
		memcpy(bindInfo.sin6_addr.s6_addr, destinationAddress->ipv6, sizeof(bindInfo.sin6_addr.s6_addr));
		err = connect(sock, (const struct sockaddr*) &bindInfo, sizeof(bindInfo));
	}

	if (err) {
		close(sock);
		return -1;
	}
	return sock;
}

static inline Socket SocketListen(Socket socket, int queueLength) {
	return listen(socket, queueLength);
}

static inline Socket SocketAccept(Socket socket, struct Address* address) {
	if (!address) {
		return accept(socket, 0, 0);
	}
	if (address->version == IPV4) {
		struct sockaddr_in addrInfo;
		memset(&addrInfo, 0, sizeof(addrInfo));
		addrInfo.sin_family = AF_INET;
		addrInfo.sin_addr.s_addr = address->ipv4;
		socklen_t len = sizeof(addrInfo);
		return accept(socket, (struct sockaddr*) &addrInfo, &len);
	} else {
		struct sockaddr_in6 addrInfo;
		memset(&addrInfo, 0, sizeof(addrInfo));
		addrInfo.sin6_family = AF_INET6;
		memcpy(addrInfo.sin6_addr.s6_addr, address->ipv6, sizeof(addrInfo.sin6_addr.s6_addr));
		socklen_t len = sizeof(addrInfo);
		return accept(socket, (struct sockaddr*) &addrInfo, &len);
	}
}

static inline int SocketClose(Socket socket) {
	return close(socket) >= 0;
}

static inline int SocketSetBlocking(Socket socket, int blocking) {
#ifdef _WIN32
	u_long unblocking = !blocking;
	return ioctlsocket(socket, FIONBIO, &unblocking) == NO_ERROR;
#else
	int flags = fcntl(socket, F_GETFL);
	if (flags == -1) {
		return 0;
	}
	if (blocking) {
		flags &= ~O_NONBLOCK;
	} else {
		flags |= O_NONBLOCK;
	}
	return fcntl(socket, F_SETFL, flags) >= 0;
#endif
}

static inline int SocketSetTCPPush(Socket socket, int push) {
	return setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, (char*) &push, sizeof(int)) >= 0;
}

#endif