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

Return to Castle Wolfenstein multiplayer GPL Source Code
Copyright (C) 1999-2010 id Software LLC, a ZeniMax Media company. 

This file is part of the Return to Castle Wolfenstein multiplayer GPL Source Code (“RTCW MP Source Code”).  

RTCW MP Source Code 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.

RTCW MP Source Code 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 RTCW MP Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the RTCW MP Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the RTCW MP Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

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


/*****************************************************************************
 * name:		be_ai_weap.c
 *
 * desc:		weapon AI
 *
 *
 *****************************************************************************/

#include "../qcommon/q_shared.h"
#include "l_libvar.h"
#include "l_log.h"
#include "l_memory.h"
#include "l_utils.h"
#include "l_script.h"
#include "l_precomp.h"
#include "l_struct.h"
#include "aasfile.h"
#include "botlib.h"
#include "be_aas.h"
#include "be_aas_funcs.h"
#include "be_interface.h"
#include "be_ai_weight.h"        //fuzzy weights
#include "be_ai_weap.h"

//#define DEBUG_AI_WEAP

//structure field offsets
#define WEAPON_OFS(x) (size_t)&(((weaponinfo_t *)0)->x)
#define PROJECTILE_OFS(x) (size_t)&(((projectileinfo_t *)0)->x)

//weapon definition
fielddef_t weaponinfo_fields[] =
{
	{"number", WEAPON_OFS( number ), FT_INT},               //weapon number
	{"name", WEAPON_OFS( name ), FT_STRING},                    //name of the weapon
	{"level", WEAPON_OFS( level ), FT_INT},
	{"model", WEAPON_OFS( model ), FT_STRING},              //model of the weapon
	{"weaponindex", WEAPON_OFS( weaponindex ), FT_INT},     //index of weapon in inventory
	{"flags", WEAPON_OFS( flags ), FT_INT},                     //special flags
	{"projectile", WEAPON_OFS( projectile ), FT_STRING},    //projectile used by the weapon
	{"numprojectiles", WEAPON_OFS( numprojectiles ), FT_INT}, //number of projectiles
	{"hspread", WEAPON_OFS( hspread ), FT_FLOAT},           //horizontal spread of projectiles (degrees from middle)
	{"vspread", WEAPON_OFS( vspread ), FT_FLOAT},           //vertical spread of projectiles (degrees from middle)
	{"speed", WEAPON_OFS( speed ), FT_FLOAT},               //speed of the projectile (0 = instant hit)
	{"acceleration", WEAPON_OFS( acceleration ), FT_FLOAT}, //"acceleration" * time (in seconds) + "speed" = projectile speed
	{"recoil", WEAPON_OFS( recoil ), FT_FLOAT | FT_ARRAY, 3}, //amount of recoil the player gets from the weapon
	{"offset", WEAPON_OFS( offset ), FT_FLOAT | FT_ARRAY, 3}, //projectile start offset relative to eye and view angles
	{"angleoffset", WEAPON_OFS( angleoffset ), FT_FLOAT | FT_ARRAY, 3}, //offset of the shoot angles relative to the view angles
	{"extrazvelocity", WEAPON_OFS( extrazvelocity ), FT_FLOAT}, //extra z velocity the projectile gets
	{"ammoamount", WEAPON_OFS( ammoamount ), FT_INT},       //ammo amount used per shot
	{"ammoindex", WEAPON_OFS( ammoindex ), FT_INT},         //index of ammo in inventory
	{"activate", WEAPON_OFS( activate ), FT_FLOAT},         //time it takes to select the weapon
	{"reload", WEAPON_OFS( reload ), FT_FLOAT},                 //time it takes to reload the weapon
	{"spinup", WEAPON_OFS( spinup ), FT_FLOAT},                 //time it takes before first shot
	{"spindown", WEAPON_OFS( spindown ), FT_FLOAT},         //time it takes before weapon stops firing
	{NULL, 0, 0, 0}
};

//projectile definition
fielddef_t projectileinfo_fields[] =
{
	{"name", PROJECTILE_OFS( name ), FT_STRING},            //name of the projectile
	{"model", PROJECTILE_OFS(model), FT_STRING},		//model of the projectile
	{"flags", PROJECTILE_OFS( flags ), FT_INT},                 //special flags
	{"gravity", PROJECTILE_OFS( gravity ), FT_FLOAT},       //amount of gravity applied to the projectile [0,1]
	{"damage", PROJECTILE_OFS( damage ), FT_INT},           //damage of the projectile
	{"radius", PROJECTILE_OFS( radius ), FT_FLOAT},         //radius of damage
	{"visdamage", PROJECTILE_OFS( visdamage ), FT_INT},     //damage of the projectile to visible entities
	{"damagetype", PROJECTILE_OFS( damagetype ), FT_INT}, //type of damage (combination of the DAMAGETYPE_? flags)
	{"healthinc", PROJECTILE_OFS( healthinc ), FT_INT},     //health increase the owner gets
	{"push", PROJECTILE_OFS( push ), FT_FLOAT},                 //amount a player is pushed away from the projectile impact
	{"detonation", PROJECTILE_OFS( detonation ), FT_FLOAT}, //time before projectile explodes after fire pressed
	{"bounce", PROJECTILE_OFS( bounce ), FT_FLOAT},         //amount the projectile bounces
	{"bouncefric", PROJECTILE_OFS( bouncefric ), FT_FLOAT}, //amount the bounce decreases per bounce
	{"bouncestop", PROJECTILE_OFS( bouncestop ), FT_FLOAT}, //minimum bounce value before bouncing stops
//recurive projectile definition??
	{NULL, 0, 0, 0}
};

structdef_t weaponinfo_struct =
{
	sizeof( weaponinfo_t ), weaponinfo_fields
};
structdef_t projectileinfo_struct =
{
	sizeof( projectileinfo_t ), projectileinfo_fields
};

//weapon configuration: set of weapons with projectiles
typedef struct weaponconfig_s
{
	int numweapons;
	int numprojectiles;
	projectileinfo_t *projectileinfo;
	weaponinfo_t *weaponinfo;
} weaponconfig_t;

//the bot weapon state
typedef struct bot_weaponstate_s
{
	struct weightconfig_s *weaponweightconfig;      //weapon weight configuration
	int *weaponweightindex;                         //weapon weight index
} bot_weaponstate_t;

bot_weaponstate_t *botweaponstates[MAX_CLIENTS + 1];
weaponconfig_t *weaponconfig;

//========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//========================================================================
int BotValidWeaponNumber( int weaponnum ) {
	if ( weaponnum <= 0 || weaponnum > weaponconfig->numweapons ) {
		botimport.Print( PRT_ERROR, "weapon number out of range\n" );
		return qfalse;
	} //end if
	return qtrue;
} //end of the function BotValidWeaponNumber
//========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//========================================================================
bot_weaponstate_t *BotWeaponStateFromHandle( int handle ) {
	if ( handle <= 0 || handle > MAX_CLIENTS ) {
		botimport.Print( PRT_FATAL, "weapon state handle %d out of range\n", handle );
		return NULL;
	} //end if
	if ( !botweaponstates[handle] ) {
		botimport.Print( PRT_FATAL, "invalid weapon state %d\n", handle );
		return NULL;
	} //end if
	return botweaponstates[handle];
} //end of the function BotWeaponStateFromHandle
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
#ifdef DEBUG_AI_WEAP
void DumpWeaponConfig( weaponconfig_t *wc ) {
	FILE *fp;
	int i;

	fp = Log_FileStruct();
	if ( !fp ) {
		return;
	}
	for ( i = 0; i < wc->numprojectiles; i++ )
	{
		WriteStructure( fp, &projectileinfo_struct, (char *) &wc->projectileinfo[i] );
		Log_Flush();
	} //end for
	for ( i = 0; i < wc->numweapons; i++ )
	{
		WriteStructure( fp, &weaponinfo_struct, (char *) &wc->weaponinfo[i] );
		Log_Flush();
	} //end for
} //end of the function DumpWeaponConfig
#endif //DEBUG_AI_WEAP
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
weaponconfig_t *LoadWeaponConfig( char *filename ) {
	int max_weaponinfo, max_projectileinfo;
	token_t token;
	char path[MAX_QPATH];
	int i, j;
	source_t *source;
	weaponconfig_t *wc;
	weaponinfo_t weaponinfo;

	max_weaponinfo = (int) LibVarValue( "max_weaponinfo", "32" );
	if ( max_weaponinfo < 0 ) {
		botimport.Print( PRT_ERROR, "max_weaponinfo = %d\n", max_weaponinfo );
		max_weaponinfo = 32;
		LibVarSet( "max_weaponinfo", "32" );
	} //end if
	max_projectileinfo = (int) LibVarValue( "max_projectileinfo", "32" );
	if ( max_projectileinfo < 0 ) {
		botimport.Print( PRT_ERROR, "max_projectileinfo = %d\n", max_projectileinfo );
		max_projectileinfo = 32;
		LibVarSet( "max_projectileinfo", "32" );
	} //end if
	Q_strncpyz( path, filename, sizeof( path ) );
	source = LoadSourceFile( path );
	if ( !source ) {
		botimport.Print( PRT_ERROR, "counldn't load %s\n", path );
		return NULL;
	} //end if
	  //initialize weapon config
	wc = (weaponconfig_t *) GetClearedHunkMemory( sizeof( weaponconfig_t ) +
												  max_weaponinfo * sizeof( weaponinfo_t ) +
												  max_projectileinfo * sizeof( projectileinfo_t ) );
	wc->weaponinfo = ( weaponinfo_t * )( (char *) wc + sizeof( weaponconfig_t ) );
	wc->projectileinfo = ( projectileinfo_t * )( (char *) wc->weaponinfo +
												 max_weaponinfo * sizeof( weaponinfo_t ) );
	wc->numweapons = max_weaponinfo;
	wc->numprojectiles = 0;
	//parse the source file
	while ( PC_ReadToken( source, &token ) )
	{
		if ( !strcmp( token.string, "weaponinfo" ) ) {
			memset( &weaponinfo, 0, sizeof( weaponinfo_t ) );
			if ( !ReadStructure( source, &weaponinfo_struct, (char *) &weaponinfo ) ) {
				FreeMemory( wc );
				FreeSource( source );
				return NULL;
			} //end if
			if ( weaponinfo.number < 0 || weaponinfo.number >= max_weaponinfo ) {
				botimport.Print( PRT_ERROR, "weapon info number %d out of range in %s\n", weaponinfo.number, path );
				FreeMemory( wc );
				FreeSource( source );
				return NULL;
			} //end if
			memcpy( &wc->weaponinfo[weaponinfo.number], &weaponinfo, sizeof( weaponinfo_t ) );
			wc->weaponinfo[weaponinfo.number].valid = qtrue;
		} //end if
		else if ( !strcmp( token.string, "projectileinfo" ) ) {
			if ( wc->numprojectiles >= max_projectileinfo ) {
				botimport.Print( PRT_ERROR, "more than %d projectiles defined in %s\n", max_projectileinfo, path );
				FreeMemory( wc );
				FreeSource( source );
				return NULL;
			} //end if
			memset( &wc->projectileinfo[wc->numprojectiles], 0, sizeof( projectileinfo_t ) );
			if ( !ReadStructure( source, &projectileinfo_struct, (char *) &wc->projectileinfo[wc->numprojectiles] ) ) {
				FreeMemory( wc );
				FreeSource( source );
				return NULL;
			} //end if
			wc->numprojectiles++;
		} //end if
		else
		{
			botimport.Print( PRT_ERROR, "unknown definition %s in %s\n", token.string, path );
			FreeMemory( wc );
			FreeSource( source );
			return NULL;
		} //end else
	} //end while
	FreeSource( source );
	//fix up weapons
	for ( i = 0; i < wc->numweapons; i++ )
	{
		if ( !wc->weaponinfo[i].valid ) {
			continue;
		}
		if ( !wc->weaponinfo[i].name[0] ) {
			botimport.Print( PRT_ERROR, "weapon %d has no name in %s\n", i, path );
			FreeMemory( wc );
			return NULL;
		} //end if
		if ( !wc->weaponinfo[i].projectile[0] ) {
			botimport.Print( PRT_ERROR, "weapon %s has no projectile in %s\n", wc->weaponinfo[i].name, path );
			FreeMemory( wc );
			return NULL;
		} //end if
		  //find the projectile info and copy it to the weapon info
		for ( j = 0; j < wc->numprojectiles; j++ )
		{
			if ( !strcmp( wc->projectileinfo[j].name, wc->weaponinfo[i].projectile ) ) {
				memcpy( &wc->weaponinfo[i].proj, &wc->projectileinfo[j], sizeof( projectileinfo_t ) );
				break;
			} //end if
		} //end for
		if ( j == wc->numprojectiles ) {
			botimport.Print( PRT_ERROR, "weapon %s uses undefined projectile in %s\n", wc->weaponinfo[i].name, path );
			FreeMemory( wc );
			return NULL;
		} //end if
	} //end for
	if ( !wc->numweapons ) {
		botimport.Print( PRT_WARNING, "no weapon info loaded\n" );
	}
	botimport.Print( PRT_MESSAGE, "loaded %s\n", path );
	return wc;
} //end of the function LoadWeaponConfig
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int *WeaponWeightIndex( weightconfig_t *wwc, weaponconfig_t *wc ) {
	int *index, i;

	//initialize item weight index
	index = (int *) GetClearedMemory( sizeof( int ) * wc->numweapons );

	for ( i = 0; i < wc->numweapons; i++ )
	{
		index[i] = FindFuzzyWeight( wwc, wc->weaponinfo[i].name );
	} //end for
	return index;
} //end of the function WeaponWeightIndex
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void BotFreeWeaponWeights( int weaponstate ) {
	bot_weaponstate_t *ws;

	ws = BotWeaponStateFromHandle( weaponstate );
	if ( !ws ) {
		return;
	}
	if ( ws->weaponweightconfig ) {
		FreeWeightConfig( ws->weaponweightconfig );
	}
	if ( ws->weaponweightindex ) {
		FreeMemory( ws->weaponweightindex );
	}
} //end of the function BotFreeWeaponWeights
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int BotLoadWeaponWeights( int weaponstate, char *filename ) {
	bot_weaponstate_t *ws;

	ws = BotWeaponStateFromHandle( weaponstate );
	if ( !ws ) {
		return BLERR_CANNOTLOADWEAPONWEIGHTS;
	}
	BotFreeWeaponWeights( weaponstate );
	//
	ws->weaponweightconfig = ReadWeightConfig( filename );
	if ( !ws->weaponweightconfig ) {
		botimport.Print( PRT_FATAL, "couldn't load weapon config %s\n", filename );
		return BLERR_CANNOTLOADWEAPONWEIGHTS;
	} //end if
	if ( !weaponconfig ) {
		return BLERR_CANNOTLOADWEAPONCONFIG;
	}
	ws->weaponweightindex = WeaponWeightIndex( ws->weaponweightconfig, weaponconfig );
	return BLERR_NOERROR;
} //end of the function BotLoadWeaponWeights
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void BotGetWeaponInfo( int weaponstate, int weapon, weaponinfo_t *weaponinfo ) {
	bot_weaponstate_t *ws;

	if ( !BotValidWeaponNumber( weapon ) ) {
		return;
	}
	ws = BotWeaponStateFromHandle( weaponstate );
	if ( !ws ) {
		return;
	}
	if ( !weaponconfig ) {
		return;
	}
	memcpy( weaponinfo, &weaponconfig->weaponinfo[weapon], sizeof( weaponinfo_t ) );
} //end of the function BotGetWeaponInfo
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int BotChooseBestFightWeapon( int weaponstate, int *inventory ) {
	int i, index, bestweapon;
	float weight, bestweight;
	weaponconfig_t *wc;
	bot_weaponstate_t *ws;

	ws = BotWeaponStateFromHandle( weaponstate );
	if ( !ws ) {
		return 0;
	}
	wc = weaponconfig;
	if ( !weaponconfig ) {
		return 0;
	}

	//if the bot has no weapon weight configuration
	if ( !ws->weaponweightconfig ) {
		return 0;
	}

	bestweight = 0;
	bestweapon = 0;
	for ( i = 0; i < wc->numweapons; i++ )
	{
		if ( !wc->weaponinfo[i].valid ) {
			continue;
		}
		index = ws->weaponweightindex[i];
		if ( index < 0 ) {
			continue;
		}
		weight = FuzzyWeight( inventory, ws->weaponweightconfig, index );
		if ( weight > bestweight ) {
			bestweight = weight;
			bestweapon = i;
		} //end if
	} //end for
	return bestweapon;
} //end of the function BotChooseBestFightWeapon
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void BotResetWeaponState( int weaponstate ) {
} //end of the function BotResetWeaponState
//========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//========================================================================
int BotAllocWeaponState( void ) {
	int i;

	for ( i = 1; i <= MAX_CLIENTS; i++ )
	{
		if ( !botweaponstates[i] ) {
			botweaponstates[i] = GetClearedMemory( sizeof( bot_weaponstate_t ) );
			return i;
		} //end if
	} //end for
	return 0;
} //end of the function BotAllocWeaponState
//========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//========================================================================
void BotFreeWeaponState( int handle ) {
	if ( handle <= 0 || handle > MAX_CLIENTS ) {
		botimport.Print( PRT_FATAL, "weapon state handle %d out of range\n", handle );
		return;
	} //end if
	if ( !botweaponstates[handle] ) {
		botimport.Print( PRT_FATAL, "invalid weapon state %d\n", handle );
		return;
	} //end if
	BotFreeWeaponWeights( handle );
	FreeMemory( botweaponstates[handle] );
	botweaponstates[handle] = NULL;
} //end of the function BotFreeWeaponState
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int BotSetupWeaponAI( void ) {
	char *file;

	file = LibVarString( "weaponconfig", "weapons.c" );
	weaponconfig = LoadWeaponConfig( file );
	if ( !weaponconfig ) {
		botimport.Print( PRT_FATAL, "couldn't load the weapon config\n" );
		return BLERR_CANNOTLOADWEAPONCONFIG;
	} //end if

#ifdef DEBUG_AI_WEAP
	DumpWeaponConfig( weaponconfig );
#endif //DEBUG_AI_WEAP
	   //
	return BLERR_NOERROR;
} //end of the function BotSetupWeaponAI
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void BotShutdownWeaponAI( void ) {
	int i;

	if ( weaponconfig ) {
		FreeMemory( weaponconfig );
	}
	weaponconfig = NULL;

	for ( i = 1; i <= MAX_CLIENTS; i++ )
	{
		if ( botweaponstates[i] ) {
			BotFreeWeaponState( i );
		} //end if
	} //end for
} //end of the function BotShutdownWeaponAI