/*************************************************************************/
/*  multiplayer_peer.cpp                                                 */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
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/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
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/*************************************************************************/

#include "multiplayer_peer.h"

#include "core/os/os.h"

uint32_t MultiplayerPeer::generate_unique_id() const {
	uint32_t hash = 0;

	while (hash == 0 || hash == 1) {
		hash = hash_djb2_one_32(
				(uint32_t)OS::get_singleton()->get_ticks_usec());
		hash = hash_djb2_one_32(
				(uint32_t)OS::get_singleton()->get_unix_time(), hash);
		hash = hash_djb2_one_32(
				(uint32_t)OS::get_singleton()->get_user_data_dir().hash64(), hash);
		hash = hash_djb2_one_32(
				(uint32_t)((uint64_t)this), hash); // Rely on ASLR heap
		hash = hash_djb2_one_32(
				(uint32_t)((uint64_t)&hash), hash); // Rely on ASLR stack

		hash = hash & 0x7FFFFFFF; // Make it compatible with unsigned, since negative ID is used for exclusion
	}

	return hash;
}

void MultiplayerPeer::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_transfer_channel", "channel"), &MultiplayerPeer::set_transfer_channel);
	ClassDB::bind_method(D_METHOD("get_transfer_channel"), &MultiplayerPeer::get_transfer_channel);
	ClassDB::bind_method(D_METHOD("set_transfer_mode", "mode"), &MultiplayerPeer::set_transfer_mode);
	ClassDB::bind_method(D_METHOD("get_transfer_mode"), &MultiplayerPeer::get_transfer_mode);
	ClassDB::bind_method(D_METHOD("set_target_peer", "id"), &MultiplayerPeer::set_target_peer);

	ClassDB::bind_method(D_METHOD("get_packet_peer"), &MultiplayerPeer::get_packet_peer);

	ClassDB::bind_method(D_METHOD("poll"), &MultiplayerPeer::poll);

	ClassDB::bind_method(D_METHOD("get_connection_status"), &MultiplayerPeer::get_connection_status);
	ClassDB::bind_method(D_METHOD("get_unique_id"), &MultiplayerPeer::get_unique_id);
	ClassDB::bind_method(D_METHOD("generate_unique_id"), &MultiplayerPeer::generate_unique_id);

	ClassDB::bind_method(D_METHOD("set_refuse_new_connections", "enable"), &MultiplayerPeer::set_refuse_new_connections);
	ClassDB::bind_method(D_METHOD("is_refusing_new_connections"), &MultiplayerPeer::is_refusing_new_connections);

	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "refuse_new_connections"), "set_refuse_new_connections", "is_refusing_new_connections");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "transfer_mode", PROPERTY_HINT_ENUM, "Unreliable,Unreliable Ordered,Reliable"), "set_transfer_mode", "get_transfer_mode");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "transfer_channel", PROPERTY_HINT_RANGE, "0,255,1"), "set_transfer_channel", "get_transfer_channel");

	BIND_ENUM_CONSTANT(TRANSFER_MODE_UNRELIABLE);
	BIND_ENUM_CONSTANT(TRANSFER_MODE_UNRELIABLE_ORDERED);
	BIND_ENUM_CONSTANT(TRANSFER_MODE_RELIABLE);

	BIND_ENUM_CONSTANT(CONNECTION_DISCONNECTED);
	BIND_ENUM_CONSTANT(CONNECTION_CONNECTING);
	BIND_ENUM_CONSTANT(CONNECTION_CONNECTED);

	BIND_CONSTANT(TARGET_PEER_BROADCAST);
	BIND_CONSTANT(TARGET_PEER_SERVER);

	ADD_SIGNAL(MethodInfo("peer_connected", PropertyInfo(Variant::INT, "id")));
	ADD_SIGNAL(MethodInfo("peer_disconnected", PropertyInfo(Variant::INT, "id")));
	ADD_SIGNAL(MethodInfo("server_disconnected"));
	ADD_SIGNAL(MethodInfo("connection_succeeded"));
	ADD_SIGNAL(MethodInfo("connection_failed"));
}