/*
 * Hedgewars, a free turn based strategy game
 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

/**
 * This file contains functions for communicating with a Hedgewars server to chat, prepare
 * and play rounds of Hedgewars.
 *
 * To use this, first create a netconn object by calling flib_netconn_create. This will
 * start the connection to the game server (which might fail right away, the function
 * returns null then). You should also register your callback functions right at the start
 * to ensure you don't miss any callbacks.
 *
 * In order to allow the netconn to run, you should regularly call flib_netconn_tick(), which
 * performs network I/O and calls your callbacks on interesting events.
 *
 * When the connection is closed, you will receive the onDisconnect callback. This is the
 * signal to destroy the netconn and stop calling tick().
 *
 * The connection process lasts from the time you create the netconn until you receive the
 * onConnected callback (or onDisconnected in case something goes wrong). During that time,
 * you might receive the onNickTaken and onPasswordRequest callbacks; see their description
 * for more information on how to handle them. You could also receive other callbacks during
 * connecting (e.g. about the room list), but it should be safe to ignore them.
 *
 * Once you are connected, you are in the lobby, and you can enter rooms and leave them again.
 * The room and lobby states have different protocols, so many commands only work in either
 * one or the other. If you are in a room you might also be in a game, but that does not
 * change the protocol. The functions below are grouped by the states in which they make
 * sense, or (for the callbacks) the states in which you would typically receive them.
 *
 * The state changes from lobby to room when the server tells you that you just entered one,
 * which will also trigger the onEnterRoom callback. This usually happens in reply to either
 * a joinRoom, createRoom or playerFollow command.
 *
 * The state changes back to lobby when the room is dissolved, when you are kicked from the
 * room, or when you actively leave the room using flib_netconn_send_leaveRoom. The first
 * two events will trigger the onLeaveRoom callback.
 */

#ifndef NETCONN_H_
#define NETCONN_H_

#include "../model/gamesetup.h"
#include "../model/scheme.h"
#include "../model/room.h"

#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>

#define NETCONN_STATE_CONNECTING 0
#define NETCONN_STATE_LOBBY 1
#define NETCONN_STATE_ROOM 2
#define NETCONN_STATE_DISCONNECTED 10

#define NETCONN_DISCONNECT_NORMAL 0				// The connection was closed normally
#define NETCONN_DISCONNECT_SERVER_TOO_OLD 1		// The server has a lower protocol version than we do
#define NETCONN_DISCONNECT_AUTH_FAILED 2		// You sent a password with flib_netconn_send_password that was not accepted
#define NETCONN_DISCONNECT_CONNLOST 3			// The network connection was lost
#define NETCONN_DISCONNECT_INTERNAL_ERROR 100	// Something went wrong in frontlib itself

#define NETCONN_ROOMLEAVE_ABANDONED 0			// The room was closed because the chief left
#define NETCONN_ROOMLEAVE_KICKED 1				// You have been kicked from the room

#define NETCONN_MSG_TYPE_PLAYERINFO 0			// A response to flib_netconn_send_playerInfo
#define NETCONN_MSG_TYPE_SERVERMESSAGE 1		// The welcome message when connecting to the lobby
#define NETCONN_MSG_TYPE_WARNING 2				// A general warning message
#define NETCONN_MSG_TYPE_ERROR 3				// A general error message

#define NETCONN_MAPCHANGE_FULL 0
#define NETCONN_MAPCHANGE_MAP 1
#define NETCONN_MAPCHANGE_MAPGEN 2
#define NETCONN_MAPCHANGE_DRAWNMAP 3
#define NETCONN_MAPCHANGE_MAZE_SIZE 4
#define NETCONN_MAPCHANGE_TEMPLATE 5
#define NETCONN_MAPCHANGE_THEME 6
#define NETCONN_MAPCHANGE_SEED 7

// TODO: Order of functions, and match the order in netconn.c
typedef struct _flib_netconn flib_netconn;

/**
 * Create a new netplay connection with these parameters.
 * The path to the data directory must end with a path delimiter (e.g. C:\Games\Hedgewars\Data\)
 */
flib_netconn *flib_netconn_create(const char *playerName, flib_metascheme *metacfg, const char *dataDirPath, const char *host, int port);
void flib_netconn_destroy(flib_netconn *conn);

/**
 * Perform I/O operations and call callbacks if something interesting happens.
 * Should be called regularly.
 */
void flib_netconn_tick(flib_netconn *conn);

/**
 * Are you currently the owner of this room? The return value only makes sense in
 * NETCONN_STATE_ROOM and NETCONN_STATE_INGAME states.
 */
bool flib_netconn_is_chief(flib_netconn *conn);

/**
 * Returns the playername. This is *probably* the one provided on creation, but
 * if that name was already taken, a different one could have been set by the
 * onNickTaken callback or its default implementation.
 */
const char *flib_netconn_get_playername(flib_netconn *conn);

/**
 * Generate a game setup from the current room state.
 * Returns NULL if the room state does not contain enough information
 * for a complete game setup, or if an error occurs.
 *
 * The new gamesetup must be destroyed with flib_gamesetup_destroy().
 */
flib_gamesetup *flib_netconn_create_gamesetup(flib_netconn *conn);

/**
 * quitmsg may be null
 */
int flib_netconn_send_quit(flib_netconn *conn, const char *quitmsg);
int flib_netconn_send_chat(flib_netconn *conn, const char *chat);

/**
 * Send a teamchat message, forwarded from the engine. Only makes sense ingame.
 * The server does not send a reply. In contrast to a Chat message, the server
 * automatically converts this into an engine message and passes it on to the other
 * clients.
 */
int flib_netconn_send_teamchat(flib_netconn *conn, const char *msg);

/**
 * Send the password in reply to a password request.
 * If the server does not accept the password, you will be disconnected (NETCONN_DISCONNECT_AUTH_FAILED)
 */
int flib_netconn_send_password(flib_netconn *conn, const char *passwd);

/**
 * Request a different nickname.
 * This function only makes sense in reaction to an onNickTaken callback, because the netconn automatically
 * requests the nickname you provide on creation, and once the server accepts the nickname it can no longer
 * be changed.
 */
int flib_netconn_send_nick(flib_netconn *conn, const char *nick);

/**
 * Request an update of the room list. Only makes sense when in lobby state.
 * If the action succeeds, you will receive an onRoomlist callback containing the current room data.
 */
int flib_netconn_send_request_roomlist(flib_netconn *conn);

/**
 * Join a room as guest (not chief). Only makes sense when in lobby state. If the action succeeds, you will
 * receive an onEnterRoom callback with chief=false.
 */
int flib_netconn_send_joinRoom(flib_netconn *conn, const char *room);

/**
 * Create and join a new room. Only makes sense when in lobby state. If the action succeeds, you will
 * receive an onEnterRoom callback with chief=true.
 */
int flib_netconn_send_createRoom(flib_netconn *conn, const char *room);

/**
 * Rename the current room. Only makes sense in room state and if you are chief. If the action succeeds, you will
 * receive an onRoomUpdate callback containing the change.
 */
int flib_netconn_send_renameRoom(flib_netconn *conn, const char *roomName);

/**
 * Leave the room for the lobby. Only makes sense in room state. msg can be NULL if you don't want to
 * send a message. The server always accepts a part message, so once you send it off, you can just
 * assume that you are back in the lobby.
 */
int flib_netconn_send_leaveRoom(flib_netconn *conn, const char *msg);

/**
 * Change your "ready" status in the room. Only makes sense when in room state. If the action succeeds, you will
 * receive an onReadyState callback containing the change.
 */
int flib_netconn_send_toggleReady(flib_netconn *conn);

/**
 * Add a team to the current room. Apart from the "fixed" team information, this also includes
 * the color, but not the number of hogs. Only makes sense when in room state. If the action
 * succeeds, you will receive an onTeamAccepted callback with the name of the team.
 */
int flib_netconn_send_addTeam(flib_netconn *conn, const flib_team *team);

/**
 * Remove the team with the name teamname. Only makes sense when in room state.
 * The server does not send a reply on success.
 */
int flib_netconn_send_removeTeam(flib_netconn *conn, const char *teamname);

/**
 * Send an engine message. Only makes sense when ingame. In a networked game, you have to
 * pass all the engine messages from the engine here, and they will be spread to all other
 * clients in the game to keep the game in sync.
 */
int flib_netconn_send_engineMessage(flib_netconn *conn, const uint8_t *message, size_t size);

/**
 * Set the number of hogs for a team. Only makes sense in room state and if you are chief.
 * The server does not send a reply.
 */
int flib_netconn_send_teamHogCount(flib_netconn *conn, const char *teamname, int hogcount);

/**
 * Set the teamcolor of a team. Only makes sense in room state and if you are chief.
 * The server does not send a reply.
 */
int flib_netconn_send_teamColor(flib_netconn *conn, const char *teamname, int colorIndex);

/**
 * Set the weaponset for the room. Only makes sense in room state and if you are chief.
 * The server does not send a reply.
 */
int flib_netconn_send_weaponset(flib_netconn *conn, const flib_weaponset *weaponset);

/**
 * Set the map for the room. Only makes sense in room state and if you are chief.
 * The server does not send a reply.
 */
int flib_netconn_send_map(flib_netconn *conn, const flib_map *map);

/**
 * Set the mapname. Only makes sense in room state and if you are chief.
 * The server does not send a reply.
 */
int flib_netconn_send_mapName(flib_netconn *conn, const char *mapName);

/**
 * Set the map generator. Only makes sense in room state and if you are chief.
 * The server does not send a reply.
 */
int flib_netconn_send_mapGen(flib_netconn *conn, int mapGen);

/**
 * Set the map template for regular maps. Only makes sense in room state and if you are chief.
 * The server does not send a reply.
 */
int flib_netconn_send_mapTemplate(flib_netconn *conn, int templateFilter);

/**
 * Set the maze template (maze size) for mazes. Only makes sense in room state and if you are chief.
 * The server does not send a reply.
 */
int flib_netconn_send_mapMazeSize(flib_netconn *conn, int mazeSize);

/**
 * Set the seed for the map. Only makes sense in room state and if you are chief.
 * The server does not send a reply.
 */
int flib_netconn_send_mapSeed(flib_netconn *conn, const char *seed);

/**
 * Set the theme for the map. Only makes sense in room state and if you are chief.
 * The server does not send a reply.
 */
int flib_netconn_send_mapTheme(flib_netconn *conn, const char *theme);

/**
 * Set the draw data for the drawn map. Only makes sense in room state and if you are chief.
 * The server does not send a reply.
 */
int flib_netconn_send_mapDrawdata(flib_netconn *conn, const uint8_t *drawData, size_t size);

/**
 * Set the script (game style). Only makes sense in room state and if you are chief.
 * The server does not send a reply.
 */
int flib_netconn_send_script(flib_netconn *conn, const char *scriptName);

/**
 * Set the scheme. Only makes sense in room state and if you are chief.
 * The server does not send a reply.
 */
int flib_netconn_send_scheme(flib_netconn *conn, const flib_scheme *scheme);

/**
 * Inform the server that the round has ended. Call this when the engine
 * has disconnected, passing 1 if the round ended normally, 0 otherwise.
 */
int flib_netconn_send_roundfinished(flib_netconn *conn, bool withoutError);

/**
 * Ban a player. You need to be in the lobby and a server admin for this to work.
 */
int flib_netconn_send_ban(flib_netconn *conn, const char *playerName);

/**
 * Kick a player. This has different meanings in the lobby and in a room;
 * In the lobby, it will kick the player from the server, and you need to be a server admin to do it.
 * In a room, it will kick the player from the room, and you need to be room chief.
 */
int flib_netconn_send_kick(flib_netconn *conn, const char *playerName);

/**
 * Request information about a player. If the action succeeds, you will
 * receive an onMessage callback with NETCONN_MSG_TYPE_PLAYERINFO containing
 * the requested information.
 */
int flib_netconn_send_playerInfo(flib_netconn *conn, const char *playerName);

/**
 * Follow a player. Only valid in the lobby. If the player is in a room (or in a game),
 * this command is analogous to calling flib_netconn_send_joinRoom with that room.
 */
int flib_netconn_send_playerFollow(flib_netconn *conn, const char *playerName);

/**
 * Signal that you want to start the game. Only makes sense in room state and if you are chief.
 * The server will check whether all players are ready and whether it believes the setup makes
 * sense (e.g. more than one clan). If the server is satisfied, you will receive an onRunGame
 * callback (all other clients in the room are notified the same way). Otherwise the server
 * might answer with a warning, or might not answer at all.
 */
int flib_netconn_send_startGame(flib_netconn *conn);

/**
 * Allow/forbid players to join the room. Only makes sense in room state and if you are chief.
 * The server does not send a reply.
 */
int flib_netconn_send_toggleRestrictJoins(flib_netconn *conn);

/**
 * Allow/forbid adding teams to the room. Only makes sense in room state and if you are chief.
 * The server does not send a reply.
 */
int flib_netconn_send_toggleRestrictTeams(flib_netconn *conn);

/**
 * Does something administrator-y. At any rate you need to be an administrator and in the lobby
 * to use this command.
 */
int flib_netconn_send_clearAccountsCache(flib_netconn *conn);

/**
 * Sets a server variable to the indicated value. Only makes sense if you are server admin.
 * Known variables are MOTD_NEW, MOTD_OLD and LATEST_PROTO.
 */
int flib_netconn_send_setServerVar(flib_netconn *conn, const char *name, const char *value);

/**
 * Queries all server variables. Only makes sense if you are server admin.
 * If the action succeeds, you will receive several onServerVar callbacks with the
 * current values of all server variables.
 */
int flib_netconn_send_getServerVars(flib_netconn *conn);










/**
 * Callback for several informational messages that should be displayed to the user
 * (e.g. in the chat window), but do not require a reaction. If a game is running, you might
 * want to redirect some of these messages to the engine as well so the user will see them.
 */
void flib_netconn_onMessage(flib_netconn *conn, void (*callback)(void *context, int msgtype, const char *msg), void* context);

/**
 * We received a chat message. Where this message belongs depends on the current state (lobby/room/game). In particular,
 * if a game is running the message should be passed to the engine.
 */
void flib_netconn_onChat(flib_netconn *conn, void (*callback)(void *context, const char *nick, const char *msg), void* context);

/**
 * This is called when we receive a CONNECTED message from the server, which should be the first
 * message arriving from the server.
 */
void flib_netconn_onConnected(flib_netconn *conn, void (*callback)(void *context), void* context);

/**
 * This is *always* the last callback (unless the netconn is destroyed early), and the netconn should be destroyed when it is received.
 * The reason is one of the NETCONN_DISCONNECT_ constants. Sometime a message is included as well, but that parameter might
 * also be NULL.
 */
void flib_netconn_onDisconnected(flib_netconn *conn, void (*callback)(void *context, int reason, const char *message), void* context);

/**
 * Callbacks for room list updates. The roomlist can be queried with flib_netconn_send_request_roomlist(), which will
 * trigger flib_netconn_onRoomlist once the server replies. Additionally, the roomAdd/delete/update callbacks will fire
 * whenever the server informs about these events, which can happen *before* the roomlist is first received - so be sure
 * not to blindly reference your room list in these callbacks. The server currently only sends updates when a room changes
 * its name, so in order to update other room information you need to query the roomlist again.
 */
void flib_netconn_onRoomlist(flib_netconn *conn, void (*callback)(void *context, const flib_room **rooms, int roomCount), void* context);
void flib_netconn_onRoomAdd(flib_netconn *conn, void (*callback)(void *context, const flib_room *room), void* context);
void flib_netconn_onRoomDelete(flib_netconn *conn, void (*callback)(void *context, const char *name), void* context);
void flib_netconn_onRoomUpdate(flib_netconn *conn, void (*callback)(void *context, const char *oldName, const flib_room *room), void* context);

/**
 * Callbacks for players joining or leaving the lobby. If join is true it's a join, otherwise a leave.
 * NOTE: partMessage is null if no parting message was given.
 */
void flib_netconn_onLobbyJoin(flib_netconn *conn, void (*callback)(void *context, const char *nick), void* context);
void flib_netconn_onLobbyLeave(flib_netconn *conn, void (*callback)(void *context, const char *nick, const char *partMessage), void* context);

/**
 * onNickTaken is called on connecting to the server, if it turns out that there is already a player with the same nick.
 * In order to proceed, a new nickname needs to be sent to the server using flib_netconn_send_nick() (or of course you can
 * bail out and send a QUIT). If you don't set a callback, the netconn will automatically react by generating a new name.
 * Once the server accepts a name, you will be informed with an onNickAccept callback.
 */
void flib_netconn_onNickTaken(flib_netconn *conn, void (*callback)(void *context, const char *nick), void* context);

/**
 * When connecting with a registered nickname, the server will ask for a password before admitting you in.
 * This callback is called when that happens. As a reaction, you can send the password using
 * flib_netconn_send_password or choose a different nick. If you don't register a callback,
 * the default behavior is to just quit in a way that will cause a disconnect with NETCONN_DISCONNECT_AUTH_FAILED.
 */
void flib_netconn_onPasswordRequest(flib_netconn *conn, void (*callback)(void *context, const char *nick), void* context);

/**
 * You just left the lobby and entered a room.
 * If chief is true, you can and should send a full configuration for the room now.
 * This consists of ammo, scheme, script and map, where map apparently has to come last.
 */
void flib_netconn_onEnterRoom(flib_netconn *conn, void (*callback)(void *context, bool chief), void *context);


/**
 * The following callbacks are only relevant in room state.
 */

/**
 * This callback informs about changes to your room chief status, i.e. whether you are allowed to
 * modify the current room. Generally when you create a room you start out being room chief, and
 * when you join an existing room you are not. However, in some situations room ownership can change,
 * and if that happens this callback is called with the new status.
 *
 * Note: This callback does not automatically fire when joining a room. You can always query the
 * current chief status using flib_netconn_is_chief().
 */
void flib_netconn_onRoomChiefStatus(flib_netconn *conn, void (*callback)(void *context, bool chief), void* context);

/**
 * One of the players in the room (possibly you!) changed their ready state.
 */
void flib_netconn_onReadyState(flib_netconn *conn, void (*callback)(void *context, const char *nick, bool ready), void* context);

/**
 * You just left a room and entered the lobby again.
 * reason is one of the NETCONN_ROOMLEAVE_ constants.
 * This will not be called when you actively leave a room using PART.
 */
void flib_netconn_onLeaveRoom(flib_netconn *conn, void (*callback)(void *context, int reason, const char *message), void *context);

/**
 * A new team was added to the room. The person who adds a team does NOT receive this callback (he gets onTeamAccepted instead).
 * The team does not contain bindings, stats, weaponset, color or the number of hogs.
 *
 * If you receive this message and you are the room chief, you are expected to provide a color and hog count for this team using
 * flib_netconn_send_teamHogCount / teamColor.
 */
void flib_netconn_onTeamAdd(flib_netconn *conn, void (*callback)(void *context, const flib_team *team), void *context);

/**
 * A team was removed from the room.
 */
void flib_netconn_onTeamDelete(flib_netconn *conn, void (*callback)(void *context, const char *teamname), void *context);

void flib_netconn_onRoomJoin(flib_netconn *conn, void (*callback)(void *context, const char *nick), void* context);
void flib_netconn_onRoomLeave(flib_netconn *conn, void (*callback)(void *context, const char *nick, const char *partMessage), void* context);

/**
 * The game is starting. Fire up the engine and join in!
 * You can let the netconn generate the right game setup using flib_netconn_create_gamesetup
 */
void flib_netconn_onRunGame(flib_netconn *conn, void (*callback)(void *context), void *context);

/**
 * When you ask for a team to be added, the server might reject it for several reasons, e.g. because it has the same name
 * as an existing team, or because the room chief restricted adding new teams. If the team is accepted by the server,
 * this callback is fired.
 *
 * If you are the room chief, you are expected to provide the hog count for your own team now using flib_netconn_send_teamHogCount.
 * The color of the team is already set to the one you provided in addTeam, but the QtFrontend apparently always uses 0 there and
 * instead sets the color after the team is accepted.
 */
void flib_netconn_onTeamAccepted(flib_netconn *conn, void (*callback)(void *context, const char *team), void *context);

/**
 * The number of hogs in a team has been changed by the room chief. If you are the chief and change the number of hogs yourself,
 * you will not receive this callback!
 */
void flib_netconn_onHogCountChanged(flib_netconn *conn, void (*callback)(void *context, const char *teamName, int hogs), void *context);

/**
 * The color of a team has been changed by the room chief. If you are the chief and change the color yourself,
 * you will not receive this callback!
 */
void flib_netconn_onTeamColorChanged(flib_netconn *conn, void (*callback)(void *context, const char *teamName, int colorIndex), void *context);

void flib_netconn_onEngineMessage(flib_netconn *conn, void (*callback)(void *context, const uint8_t *message, size_t size), void *context);

void flib_netconn_onCfgScheme(flib_netconn *conn, void (*callback)(void *context, const flib_scheme *scheme), void *context);

/**
 * This is called when the map configuration in a room is changed (or first received). Only non-chiefs receive these messages.
 * To reduce the number of callback functions, the netconn keeps track of the current map settings and always passes the entire
 * current map config, but informs the callee about what has changed (see the NETCONN_MAPCHANGE_ constants).
 * The map parameter passed to the callback is an internally held map config. If you want to keep it around, best make a copy
 * or it may or may not change while you are not looking.
 *
 * Caution: Due to the way the protocol works, the map might not be complete at this point if it is a hand-drawn map, because
 * the "full" map config does not include the drawn map data.
 */
void flib_netconn_onMapChanged(flib_netconn *conn, void (*callback)(void *context, const flib_map *map, int changetype), void *context);

/**
 * The "game style" script has been changed by the room chief. If you are the chief and change the script yourself,
 * you will not receive this callback!
 */
void flib_netconn_onScriptChanged(flib_netconn *conn, void (*callback)(void *context, const char *script), void *context);

/**
 * The weaponset has been changed by the room chief. If you are the chief and change the weaponset yourself,
 * you will not receive this callback!
 */
void flib_netconn_onWeaponsetChanged(flib_netconn *conn, void (*callback)(void *context, const flib_weaponset *weaponset), void *context);

/**
 * This callback is called if the server informs us that we have admin rights.
 */
void flib_netconn_onAdminAccess(flib_netconn *conn, void (*callback)(void *context), void *context);

/**
 * When you query the server vars with flib_netconn_send_getServerVars (only works as admin), the server
 * replies with a list of them. This callback is called for each entry in that list.
 */
void flib_netconn_onServerVar(flib_netconn *conn, void (*callback)(void *context, const char *name, const char *value), void *context);

#endif