/*
 * Kangaroo Punch MultiPlayer Game Server Mark II
 * Copyright (C) 2020-2021  Scott Duensing
 *
 * 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 <https://www.gnu.org/licenses/>.
 *
 */


#ifndef PACKETS_H
#define PACKETS_H


#include <stdint.h>


#define PACKET_PROTOCOL_VERSION  1


// This enum is treated as BYTES in the code.  Do not go over 255 entries.
// Also update array in client.c!
typedef enum PacketTypeE {
	// These packets have to be first and in this order!  Do not change them!
	PACKET_TYPE_NONE = 0,  // No packet.
	PACKET_TYPE_DH_REQUEST,
	PACKET_TYPE_DH_RESPONSE,
	PACKET_TYPE_VERSION,
	PACKET_TYPE_VERSION_BAD,
	PACKET_TYPE_VERSION_OKAY,

	// Packets received by only the server:
	PACKET_TYPE_CLIENT_SHUTDOWN,
	PACKET_TYPE_FILE_REQUEST,
	PACKET_TYPE_LOGIN,
	PACKET_TYPE_PONG,
	PACKET_TYPE_SIGNUP,

	// Packets received by only the client:
	PACKET_TYPE_FILE_RESPONSE,
	PACKET_TYPE_LOGIN_RESULT,
	PACKET_TYPE_PING,
	PACKET_TYPE_PROCEED,
	PACKET_TYPE_SERVER_SHUTDOWN,
	PACKET_TYPE_SIGNUP_RESULT,

	// How many packet types do we recognize?
	PACKET_TYPE_COUNT
} PacketTypeT;

/*
 * Client -> PACKET_TYPE_FILE_REQUEST FILE_REQUEST_CHECK SHA256 VPATH
 * Server -> PACKET_TYPE_FILE_RESPONSE FILE_RESPONSE_OKAY
 * - or -
 * Server -> PACKET_TYPE_FILE_RESPONSE FILE_RESPONSE_SEND (4 bytes length) SHA256
 *
 * Server -> PACKET_TYPE_FILE_RESPONSE FILE_RESPONSE_DATA (data...)
 * Client -> PACKET_TYPE_FILE_REQUEST FILE_REQUEST_NEXT
 *           (Repeat until received data matches the length.)
 */
typedef enum FileRequestsE {
	FILE_REQUEST_UNKNOWN = 0,
	FILE_REQUEST_CHECK,
	FILE_REQUEST_NEXT
} FileRequestsT;

typedef enum FileResponseE {
	FILE_RESPONSE_UNKNOWN = 0,
	FILE_RESPONSE_DATA,
	FILE_RESPONSE_OKAY,
	FILE_RESPONSE_SEND
} FileResponseT;


#endif // PACKETS_H