module eventcore.socket;

import eventcore.core : eventDriver;
import eventcore.driver;
import core.time: Duration;
import std.exception : enforce;
import std.socket : Address;


StreamSocket connectStream(alias callback)(scope Address peer_address)
@safe {
	void cb(StreamSocketFD fd, ConnectStatus status) @safe nothrow {
		if (fd != StreamSocketFD.invalid) eventDriver.sockets.addRef(fd);
		callback(StreamSocket(fd), status);
		if (fd != StreamSocketFD.invalid) eventDriver.sockets.releaseRef(fd);
	}

	auto fd = eventDriver.sockets.connectStream(peer_address, null, &cb);
	enforce(fd != StreamSocketFD.invalid, "Failed to create socket.");
	eventDriver.sockets.addRef(fd);
	return StreamSocket(fd);
}

StreamListenSocket listenStream(scope Address bind_address)
@safe {
	auto fd = eventDriver.sockets.listenStream(bind_address, null);
	enforce(fd != StreamListenSocketFD.invalid, "Failed to create socket.");
	return StreamListenSocket(fd);
}

DatagramSocket createDatagramSocket(scope Address bind_address, scope Address target_address = null)
@safe {
	auto fd = eventDriver.sockets.createDatagramSocket(bind_address, target_address);
	enforce(fd != DatagramSocketFD.invalid, "Failed to create socket.");
	return DatagramSocket(fd);
}

struct StreamSocket {
	@safe: nothrow:

	private StreamSocketFD m_fd;

	private this(StreamSocketFD fd)
	{
		m_fd = fd;
	}

	this(this) { if (m_fd != StreamSocketFD.invalid) eventDriver.sockets.addRef(m_fd); }
	~this() { if (m_fd != StreamSocketFD.invalid) eventDriver.sockets.releaseRef(m_fd); }

	@property ConnectionState state() { return eventDriver.sockets.getConnectionState(m_fd); }
	@property void tcpNoDelay(bool enable) { eventDriver.sockets.setTCPNoDelay(m_fd, enable); }
	void setKeepAlive(bool enable) { eventDriver.sockets.setKeepAlive(m_fd, enable); }
	void setKeepAliveParams(Duration idle, Duration interval, int probeCount = 5) {
		eventDriver.sockets.setKeepAliveParams(m_fd, idle, interval, probeCount);
	}
	void setUserTimeout(Duration timeout) { eventDriver.sockets.setUserTimeout(m_fd, timeout); }
}

void read(alias callback)(ref StreamSocket socket, ubyte[] buffer, IOMode mode)
{
	void cb(StreamSocketFD, IOStatus status, size_t nbytes) @safe nothrow {
		callback(status, nbytes);
	}
	eventDriver.sockets.read(socket.m_fd, buffer, mode, &cb);
}
void cancelRead(ref StreamSocket socket) @safe nothrow  { eventDriver.sockets.cancelRead(socket.m_fd); }
void waitForData(alias callback)(ref StreamSocket socket)
{
	void cb(StreamSocketFD, IOStatus status, size_t nbytes) @safe nothrow {
		callback(status, nbytes);
	}
	eventDriver.sockets.waitForData(socket.m_fd, &cb);
}
void write(alias callback)(ref StreamSocket socket, const(ubyte)[] buffer, IOMode mode)
{
	void cb(StreamSocketFD, IOStatus status, size_t nbytes) @safe nothrow {
		callback(status, nbytes);
	}
	eventDriver.sockets.write(socket.m_fd, buffer, mode, &cb);
}
void cancelWrite(ref StreamSocket socket) @safe nothrow { eventDriver.sockets.cancelWrite(socket.m_fd); }
void shutdown(ref StreamSocket socket, bool shut_read = true, bool shut_write = true)
@safe nothrow {
	eventDriver.sockets.shutdown(socket.m_fd, shut_read, shut_write);
}


struct StreamListenSocket {
	@safe: nothrow:

	private StreamListenSocketFD m_fd;

	private this(StreamListenSocketFD fd)
	{
		m_fd = fd;
	}

	this(this) { if (m_fd != StreamListenSocketFD.invalid) eventDriver.sockets.addRef(m_fd); }
	~this() { if (m_fd != StreamListenSocketFD.invalid) eventDriver.sockets.releaseRef(m_fd); }
}

void waitForConnections(alias callback)(ref StreamListenSocket socket)
{
	void cb(StreamListenSocketFD, StreamSocketFD sock, scope RefAddress addr) @safe nothrow {
		auto ss = StreamSocket(sock);
		callback(ss, addr);
	}
	eventDriver.sockets.waitForConnections(socket.m_fd, &cb);
}


struct DatagramSocket {
	@safe: nothrow:

	private DatagramSocketFD m_fd;

	private this(DatagramSocketFD fd)
	{
		m_fd = fd;
	}

	this(this) { if (m_fd != DatagramSocketFD.invalid) eventDriver.sockets.addRef(m_fd); }
	~this() { if (m_fd != DatagramSocketFD.invalid) eventDriver.sockets.releaseRef(m_fd); }

	@property void broadcast(bool enable) { eventDriver.sockets.setBroadcast(m_fd, enable); }
}

void receive(alias callback)(ref DatagramSocket socket, ubyte[] buffer, IOMode mode) {
	void cb(DatagramSocketFD fd, IOStatus status, size_t bytes_written, scope RefAddress address) @safe nothrow {
		callback(status, bytes_written, address);
	}
	eventDriver.sockets.receive(socket.m_fd, buffer, mode, &cb);
}
void cancelReceive(ref DatagramSocket socket) { eventDriver.sockets.cancelReceive(socket.m_fd); }
void send(alias callback)(ref DatagramSocket socket, const(ubyte)[] buffer, IOMode mode, Address target_address = null) {
	void cb(DatagramSocketFD fd, IOStatus status, size_t bytes_written, scope RefAddress) @safe nothrow {
		callback(status, bytes_written);
	}
	eventDriver.sockets.send(socket.m_fd, buffer, mode, target_address, &cb);
}
void cancelSend(ref DatagramSocket socket) { eventDriver.sockets.cancelSend(socket.m_fd); }