/*
 * Copyright (C) 1997-2001 Id Software, Inc.
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 *
 * =======================================================================
 *
 * Here are the client, server and game are tied together.
 *
 * =======================================================================
 */

/*
 * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 *
 * THIS FILE IS _VERY_ FRAGILE AND THERE'S NOTHING IN IT THAT CAN OR
 * MUST BE CHANGED. IT'S MOST LIKELY A VERY GOOD IDEA TO CLOSE THE
 * EDITOR NOW AND NEVER LOOK BACK. OTHERWISE YOU MAY SCREW UP EVERYTHING!
 *
 * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 */

#define GAME_API_VERSION 3

#define SVF_NOCLIENT 0x00000001 /* don't send entity to clients, even if it has effects */
#define SVF_DEADMONSTER 0x00000002 /* treat as CONTENTS_DEADMONSTER for collision */
#define SVF_MONSTER 0x00000004 /* treat as CONTENTS_MONSTER for collision */

#define MAX_ENT_CLUSTERS 16

typedef enum
{
	SOLID_NOT, /* no interaction with other objects */
	SOLID_TRIGGER, /* only touch when inside, after moving */
	SOLID_BBOX, /* touch on edge */
	SOLID_BSP /* bsp clip, touch on edge */
} solid_t;

/* =============================================================== */

/* link_t is only used for entity area links now */
typedef struct link_s
{
	struct link_s *prev, *next;
} link_t;


typedef struct edict_s edict_t;
typedef struct gclient_s gclient_t;

#ifndef GAME_INCLUDE

struct gclient_s
{
	player_state_t ps;      /* communicated by server to clients */
	int ping;
	/* the game dll can add anything it wants
	   after  this point in the structure */
};

struct edict_s
{
	entity_state_t s;
	struct gclient_s *client;
	qboolean inuse;
	int linkcount;

	link_t area;                    /* linked to a division node or leaf */

	int num_clusters;               /* if -1, use headnode instead */
	int clusternums[MAX_ENT_CLUSTERS];
	int headnode;                   /* unused if num_clusters != -1 */
	int areanum, areanum2;

	int svflags;                    /* SVF_NOCLIENT, SVF_DEADMONSTER, SVF_MONSTER, etc */
	vec3_t mins, maxs;
	vec3_t absmin, absmax, size;
	solid_t solid;
	int clipmask;
	edict_t *owner;

	/* the game dll can add anything it wants
	   after this point in the structure */
};

#endif /* GAME_INCLUDE */

/* =============================================================== */

/* functions provided by the main engine */
typedef struct
{
	/* special messages */
	void (*bprintf)(int printlevel, char *fmt, ...);
	void (*dprintf)(char *fmt, ...);
	void (*cprintf)(edict_t *ent, int printlevel, char *fmt, ...);
	void (*centerprintf)(edict_t *ent, char *fmt, ...);
	void (*sound)(edict_t *ent, int channel, int soundindex, float volume,
			float attenuation, float timeofs);
	void (*positioned_sound)(vec3_t origin, edict_t *ent, int channel,
			int soundinedex, float volume, float attenuation, float timeofs);

	/* config strings hold all the index strings, the lightstyles,
	   and misc data like the sky definition and cdtrack.
	   All of the current configstrings are sent to clients when
	   they connect, and changes are sent to all connected clients. */
	void (*configstring)(int num, char *string);

	void (*error)(char *fmt, ...);

	/* the *index functions create configstrings
	   and some internal server state */
	int (*modelindex)(char *name);
	int (*soundindex)(char *name);
	int (*imageindex)(char *name);

	void (*setmodel)(edict_t *ent, char *name);

	/* collision detection */
	trace_t (*trace)(vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end,
			edict_t *passent, int contentmask);
	int (*pointcontents)(vec3_t point);
	qboolean (*inPVS)(vec3_t p1, vec3_t p2);
	qboolean (*inPHS)(vec3_t p1, vec3_t p2);
	void (*SetAreaPortalState)(int portalnum, qboolean open);
	qboolean (*AreasConnected)(int area1, int area2);

	/* an entity will never be sent to a client or used for collision
	   if it is not passed to linkentity. If the size, position, or
	   solidity changes, it must be relinked. */
	void (*linkentity)(edict_t *ent);
	void (*unlinkentity)(edict_t *ent); /* call before removing an interactive edict */
	int (*BoxEdicts)(vec3_t mins, vec3_t maxs, edict_t **list, int maxcount,
			int areatype);
	void (*Pmove)(pmove_t *pmove); /* player movement code common with client prediction */

	/* network messaging */
	void (*multicast)(vec3_t origin, multicast_t to);
	void (*unicast)(edict_t *ent, qboolean reliable);
	void (*WriteChar)(int c);
	void (*WriteByte)(int c);
	void (*WriteShort)(int c);
	void (*WriteLong)(int c);
	void (*WriteFloat)(float f);
	void (*WriteString)(char *s);
	void (*WritePosition)(vec3_t pos); /* some fractional bits */
	void (*WriteDir)(vec3_t pos); /* single byte encoded, very coarse */
	void (*WriteAngle)(float f);

	/* managed memory allocation */
	void *(*TagMalloc)(int size, int tag);
	void (*TagFree)(void *block);
	void (*FreeTags)(int tag);

	/* console variable interaction */
	cvar_t *(*cvar)(char *var_name, char *value, int flags);
	cvar_t *(*cvar_set)(char *var_name, char *value);
	cvar_t *(*cvar_forceset)(char *var_name, char *value);

	/* ClientCommand and ServerCommand parameter access */
	int (*argc)(void);
	char *(*argv)(int n);
	char *(*args)(void); /* concatenation of all argv >= 1 */

	/* add commands to the server console as if
	   they were typed in for map changing, etc */
	void (*AddCommandString)(char *text);

	void (*DebugGraph)(float value, int color);
} game_import_t;

/* functions exported by the game subsystem */
typedef struct
{
	int apiversion;

	/* the init function will only be called when a game starts,
	   not each time a level is loaded.  Persistant data for clients
	   and the server can be allocated in init */
	void (*Init)(void);
	void (*Shutdown)(void);

	/* each new level entered will cause a call to SpawnEntities */
	void (*SpawnEntities)(char *mapname, char *entstring, char *spawnpoint);

	/* Read/Write Game is for storing persistant cross level information
	   about the world state and the clients.
	   WriteGame is called every time a level is exited.
	   ReadGame is called on a loadgame. */
	void (*WriteGame)(char *filename, qboolean autosave);
	void (*ReadGame)(char *filename);

	/* ReadLevel is called after the default
	   map information has been loaded with
	   SpawnEntities */
	void (*WriteLevel)(char *filename);
	void (*ReadLevel)(char *filename);

	qboolean (*ClientConnect)(edict_t *ent, char *userinfo);
	void (*ClientBegin)(edict_t *ent);
	void (*ClientUserinfoChanged)(edict_t *ent, char *userinfo);
	void (*ClientDisconnect)(edict_t *ent);
	void (*ClientCommand)(edict_t *ent);
	void (*ClientThink)(edict_t *ent, usercmd_t *cmd);

	void (*RunFrame)(void);

	/* ServerCommand will be called when an "sv <command>"
	   command is issued on the  server console. The game can
	   issue gi.argc() / gi.argv() commands to get the rest
	   of the parameters */
	void (*ServerCommand)(void);

	/* global variables shared between game and server */

	/* The edict array is allocated in the game dll so it
	   can vary in size from one game to another.
	   The size will be fixed when ge->Init() is called */
	struct edict_s *edicts;
	int edict_size;
	int num_edicts;             /* current number, <= max_edicts */
	int max_edicts;
} game_export_t;

game_export_t *GetGameAPI(game_import_t *import);