//-------------------------------------------------------------------------
/*
Copyright (C) 2010 EDuke32 developers and contributors

This file is part of EDuke32.

EDuke32 is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License version 2
as published by the Free Software Foundation.

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.
*/
//-------------------------------------------------------------------------

#ifndef __gamevars_h__
#define __gamevars_h__

#include "gamedef.h"

#define MAXGAMEVARS 2048 // must be a power of two
#define MAXVARLABEL 26

// store global game definitions
enum GamevarFlags_t {
    GAMEVAR_PERPLAYER  = 0x00000001, // per-player variable
    GAMEVAR_PERACTOR   = 0x00000002, // per-actor variable
    GAMEVAR_USER_MASK  = (GAMEVAR_PERPLAYER|GAMEVAR_PERACTOR),
    GAMEVAR_RESET      = 0x00000008, // INTERNAL, don't use
    GAMEVAR_DEFAULT    = 0x00000100, // UNUSED, but always cleared for user-defined gamevars
    GAMEVAR_SECRET     = 0x00000200, // don't dump...
    GAMEVAR_NODEFAULT  = 0x00000400, // don't reset on actor spawn
    GAMEVAR_SYSTEM     = 0x00000800, // cannot change mode flags...(only default value)
    GAMEVAR_READONLY   = 0x00001000, // values are read-only (no setvar allowed)
    GAMEVAR_INTPTR     = 0x00002000, // plValues is a pointer to an int32_t
    GAMEVAR_SHORTPTR   = 0x00008000, // plValues is a pointer to a short
    GAMEVAR_CHARPTR    = 0x00010000, // plValues is a pointer to a char
    GAMEVAR_PTR_MASK   = (GAMEVAR_INTPTR|GAMEVAR_SHORTPTR|GAMEVAR_CHARPTR),
    GAMEVAR_NORESET    = 0x00020000, // var values are not reset when restoring map state
    GAMEVAR_SPECIAL    = 0x00040000, // flag for structure member shortcut vars
    GAMEVAR_NOMULTI    = 0x00080000, // don't attach to multiplayer packets
};

#if !defined LUNATIC

# define MAXGAMEARRAYS (MAXGAMEVARS>>2) // must be lower than MAXGAMEVARS
# define MAXARRAYLABEL MAXVARLABEL

enum GamearrayFlags_t {

    GAMEARRAY_READONLY = 0x00001000,
    GAMEARRAY_WARN = 0x00002000,

    GAMEARRAY_NORMAL   = 0x00004000,
    GAMEARRAY_OFCHAR   = 0x00000001,
    GAMEARRAY_OFSHORT  = 0x00000002,
    GAMEARRAY_OFINT    = 0x00000004,
    GAMEARRAY_TYPE_MASK = GAMEARRAY_OFCHAR|GAMEARRAY_OFSHORT|GAMEARRAY_OFINT,

    GAMEARRAY_VARSIZE = 0x00000020,

    GAMEARRAY_RESET    = 0x00000008,
///    GAMEARRAY_NORESET  = 0x00000001,
};

#pragma pack(push,1)
typedef struct {
    union {
        intptr_t lValue;
        intptr_t *plValues;     // array of values when 'per-player', or 'per-actor'
    } val;
    intptr_t lDefault;
    uintptr_t dwFlags;
    char *szLabel;
} gamevar_t;

typedef struct {
    char *szLabel;
    intptr_t *plValues;     // array of values
    intptr_t size;
    intptr_t dwFlags;
} gamearray_t;
#pragma pack(pop)

# define GAR_ELTSZ (sizeof(aGameArrays[0].plValues[0]))

extern gamevar_t aGameVars[MAXGAMEVARS];
extern gamearray_t aGameArrays[MAXGAMEARRAYS];
extern int32_t g_gameVarCount;
extern int32_t g_gameArrayCount;

int32_t __fastcall Gv_GetVar(int32_t id, int32_t iActor, int32_t iPlayer);
void __fastcall Gv_SetVar(int32_t id, int32_t lValue, int32_t iActor, int32_t iPlayer);
int32_t __fastcall Gv_GetVarX(int32_t id);
void __fastcall Gv_SetVarX(int32_t id, int32_t lValue);

int32_t Gv_GetVarByLabel(const char *szGameLabel,int32_t lDefault,int32_t iActor,int32_t iPlayer);
int32_t Gv_NewArray(const char *pszLabel,void *arrayptr,intptr_t asize,uint32_t dwFlags);
int32_t Gv_NewVar(const char *pszLabel,intptr_t lValue,uint32_t dwFlags);
void __fastcall A_ResetVars(int32_t iActor);
void Gv_DumpValues(void);
void Gv_InitWeaponPointers(void);
void Gv_RefreshPointers(void);
void Gv_ResetVars(void);
int32_t Gv_ReadSave(int32_t fil,int32_t newbehav);
void Gv_WriteSave(FILE *fil,int32_t newbehav);
#else
extern int32_t g_noResetVars;
extern LUNATIC_CB void (*A_ResetVars)(int32_t iActor);
#endif

void Gv_ResetSystemDefaults(void);
void Gv_Init(void);
void Gv_FinalizeWeaponDefaults(void);

#if !defined LUNATIC
#define GV_VAROP(func, operator) static inline void __fastcall func(int32_t id, int32_t lValue) \
{ \
    switch (aGameVars[id].dwFlags & (GAMEVAR_USER_MASK|GAMEVAR_PTR_MASK)) \
    { \
    default: \
        aGameVars[id].val.lValue operator lValue; \
        break; \
    case GAMEVAR_PERPLAYER: \
        if (EDUKE32_PREDICT_FALSE((unsigned)vm.g_p > MAXPLAYERS-1)) break; \
        aGameVars[id].val.plValues[vm.g_p] operator lValue; \
        break; \
    case GAMEVAR_PERACTOR: \
        if (EDUKE32_PREDICT_FALSE((unsigned)vm.g_i > MAXSPRITES-1)) break; \
        aGameVars[id].val.plValues[vm.g_i] operator lValue; \
        break; \
    case GAMEVAR_INTPTR: \
        *((int32_t *)aGameVars[id].val.lValue) operator (int32_t)lValue; \
        break; \
    case GAMEVAR_SHORTPTR: \
        *((int16_t *)aGameVars[id].val.lValue) operator (int16_t)lValue; \
        break; \
    case GAMEVAR_CHARPTR: \
        *((uint8_t *)aGameVars[id].val.lValue) operator (uint8_t)lValue; \
        break; \
    } \
}

// even though libdivide is faster than straight division (when using the LUT) the overhead makes this slower on x86
// ARM, however, has no hardware integer division
#if defined(__arm__) || defined(LIBDIVIDE_ALWAYS)
static inline void __fastcall Gv_DivVar(int32_t id, int32_t lValue)
{
    static libdivide_s32_t sdiv;
    static int32_t lastlValue;
    libdivide_s32_t *dptr = &sdiv;
    intptr_t *iptr = &aGameVars[id].val.lValue;

    if (EDUKE32_PREDICT_FALSE((aGameVars[id].dwFlags & GAMEVAR_PERPLAYER && (unsigned) vm.g_p > MAXPLAYERS-1) || 
        (aGameVars[id].dwFlags & GAMEVAR_PERACTOR && (unsigned) vm.g_i > MAXSPRITES-1))) return;

    if ((unsigned) lValue < DIVTABLESIZE)
        dptr = (libdivide_s32_t *)&divtable32[lValue];
    else if (lValue != lastlValue)
        sdiv = libdivide_s32_gen(lValue), lastlValue = lValue;

    switch (aGameVars[id].dwFlags & (GAMEVAR_USER_MASK|GAMEVAR_PTR_MASK))
    {
    case GAMEVAR_PERPLAYER:
        iptr = &aGameVars[id].val.plValues[vm.g_p];
    default:
        break;
    case GAMEVAR_PERACTOR:
        iptr = &aGameVars[id].val.plValues[vm.g_i];
        break;
    case GAMEVAR_INTPTR:
        *((int32_t *) aGameVars[id].val.lValue) = (int32_t) libdivide_s32_do(*((int32_t *) aGameVars[id].val.lValue), dptr);
        return;
    case GAMEVAR_SHORTPTR:
        *((int16_t *) aGameVars[id].val.lValue) = (int16_t) libdivide_s32_do(*((int16_t *) aGameVars[id].val.lValue), dptr);
        return;
    case GAMEVAR_CHARPTR:
        *((uint8_t *) aGameVars[id].val.lValue) = (uint8_t) libdivide_s32_do(*((uint8_t *) aGameVars[id].val.lValue), dptr);
        return;
    }

    *iptr = libdivide_s32_do(*iptr, dptr);
}
#else
GV_VAROP(Gv_DivVar, /=)
#endif

GV_VAROP(Gv_AddVar, +=)
GV_VAROP(Gv_SubVar, -=)
GV_VAROP(Gv_MulVar, *=)
GV_VAROP(Gv_ModVar, %=)
GV_VAROP(Gv_AndVar, &=)
GV_VAROP(Gv_XorVar, ^=)
GV_VAROP(Gv_OrVar, |=)

#endif

#endif