#ifndef __THINGDEF_H
#define __THINGDEF_H

#include "doomtype.h"
#include "info.h"
#include "s_sound.h"
#include "sc_man.h"
#include "cmdlib.h"


class FScanner;


//==========================================================================
//
// A flag descriptor
//
//==========================================================================

struct FFlagDef
{
	unsigned int flagbit;
	const char *name;
	int structoffset;
	int fieldsize;
};

FFlagDef *FindFlag (const PClass *type, const char *part1, const char *part2);
void HandleDeprecatedFlags(AActor *defaults, PClassActor *info, bool set, int index);
bool CheckDeprecatedFlags(const AActor *actor, PClassActor *info, int index);
const char *GetFlagName(unsigned int flagnum, int flagoffset);
void ModActorFlag(AActor *actor, FFlagDef *fd, bool set);
INTBOOL CheckActorFlag(const AActor *actor, FFlagDef *fd);
INTBOOL CheckActorFlag(const AActor *owner, const char *flagname, bool printerror = true);

#define FLAG_NAME(flagnum, flagvar) GetFlagName(flagnum, myoffsetof(AActor, flagvar))


//==========================================================================
//
// State parser
//
//==========================================================================
class FxExpression;

struct FStateLabels;

enum EStateDefineFlags
{
	SDF_NEXT = 0,
	SDF_STATE = 1,
	SDF_STOP = 2,
	SDF_WAIT = 3,
	SDF_LABEL = 4,
	SDF_INDEX = 5,
	SDF_MASK = 7,
	SDF_DEHACKED = 8,	// Identify a state as having been modified by a dehacked lump
};

struct FStateDefine
{
	FName Label;
	TArray<FStateDefine> Children;
	FState *State;
	BYTE DefineFlags;
};

class FStateDefinitions
{
	TArray<FStateDefine> StateLabels;
	FState *laststate;
	FState *laststatebeforelabel;
	intptr_t lastlabel;
	TArray<FState> StateArray;

	static FStateDefine *FindStateLabelInList(TArray<FStateDefine> &list, FName name, bool create);
	static FStateLabels *CreateStateLabelList(TArray<FStateDefine> &statelist);
	static void MakeStateList(const FStateLabels *list, TArray<FStateDefine> &dest);
	static void RetargetStatePointers(intptr_t count, const char *target, TArray<FStateDefine> & statelist);
	FStateDefine *FindStateAddress(const char *name);
	FState *FindState(const char *name);

	FState *ResolveGotoLabel(AActor *actor, PClassActor *mytype, char *name);
	static void FixStatePointers(PClassActor *actor, TArray<FStateDefine> & list);
	void ResolveGotoLabels(PClassActor *actor, AActor *defaults, TArray<FStateDefine> & list);

public:

	FStateDefinitions()
	{
		laststate = NULL;
		laststatebeforelabel = NULL;
		lastlabel = -1;
	}

	void SetStateLabel(const char *statename, FState *state, BYTE defflags = SDF_STATE);
	void AddStateLabel(const char *statename);
	int GetStateLabelIndex (FName statename);
	void InstallStates(PClassActor *info, AActor *defaults);
	int FinishStates(PClassActor *actor, AActor *defaults);

	void MakeStateDefines(const PClassActor *cls);
	void AddStateDefines(const FStateLabels *list);
	void RetargetStates (intptr_t count, const char *target);

	bool SetGotoLabel(const char *string);
	bool SetStop();
	bool SetWait();
	bool SetLoop();
	int AddStates(FState *state, const char *framechars);
	int GetStateCount() const { return StateArray.Size(); }
};

//==========================================================================
//
//
//
//==========================================================================

struct FStateTempCall
{
	FStateTempCall() : ActorClass(NULL), Code(NULL), FirstState(0), NumStates(0) {}

	PClassActor *ActorClass;
	class FxExpression *Code;
	class PPrototype *Proto;
	int FirstState;
	int NumStates;
};
extern TDeletingArray<FStateTempCall *> StateTempCalls;
extern TDeletingArray<class FxExpression *> ActorDamageFuncs;

//==========================================================================
//
// Extra info maintained while defining an actor.
//
//==========================================================================
class DDropItem;

struct Baggage
{
#ifdef _DEBUG
	FString ClassName;	// This is here so that during debugging the class name can be seen
#endif
	PClassActor *Info;
	bool DropItemSet;
	bool StateSet;
	int CurrentState;
	int Lumpnum;
	FStateDefinitions statedef;

	DDropItem *DropItemList;

	FScriptPosition ScriptPosition;
};

inline void ResetBaggage (Baggage *bag, PClassActor *stateclass)
{
	bag->DropItemList = NULL;
	bag->DropItemSet = false;
	bag->CurrentState = 0;
	bag->StateSet = false;
	bag->statedef.MakeStateDefines(stateclass);
}

//==========================================================================
//
// Damage function creation
//
//==========================================================================

VMScriptFunction *CreateDamageFunction(int dmg);

//==========================================================================
//
// Action function lookup
//
//==========================================================================

struct AFuncDesc
{
	const char *Name;
	actionf_p Function;
	VMNativeFunction **VMPointer;
};

AFuncDesc *FindFunction(const char * string);


void ParseStates(FScanner &sc, PClassActor *actor, AActor *defaults, Baggage &bag);
void ParseFunctionParameters(FScanner &sc, PClassActor *cls, TArray<FxExpression *> &out_params,
	PFunction *afd, FString statestring, FStateDefinitions *statedef);
FxExpression *ParseActions(FScanner &sc, FState state, FString statestring, Baggage &bag, bool &endswithret);
class FxVMFunctionCall *ParseAction(FScanner &sc, FState state, FString statestring, Baggage &bag);
FName CheckCastKludges(FName in);
void SetImplicitArgs(TArray<PType *> *args, TArray<DWORD> *argflags, PClassActor *cls, DWORD funcflags);

PFunction *FindGlobalActionFunction(const char *name);

//==========================================================================
//
// Property parser
//
//==========================================================================

PClassActor *CreateNewActor(const FScriptPosition &sc, FName typeName, FName parentName, bool native);
void SetReplacement(FScanner &sc, PClassActor *info, FName replaceName);

void HandleActorFlag(FScanner &sc, Baggage &bag, const char *part1, const char *part2, int mod);
void FinishActor(const FScriptPosition &sc, PClassActor *info, Baggage &bag);
FxExpression *ParseParameter(FScanner &sc, PClassActor *cls, PType *type, bool constant);


enum 
{
	DEPF_UNUSED,
	DEPF_FIREDAMAGE,
	DEPF_ICEDAMAGE,
	DEPF_LOWGRAVITY,
	DEPF_LONGMELEERANGE,
	DEPF_SHORTMISSILERANGE,
	DEPF_PICKUPFLASH,
	DEPF_QUARTERGRAVITY,
	DEPF_FIRERESIST,
	DEPF_HERETICBOUNCE,
	DEPF_HEXENBOUNCE,
	DEPF_DOOMBOUNCE,
	DEPF_INTERHUBSTRIP,
};

// Types of old style decorations
enum EDefinitionType
{
	DEF_Decoration,
	DEF_BreakableDecoration,
	DEF_Pickup,
	DEF_Projectile,
};

#if defined(_MSC_VER)
#pragma section(".areg$u",read)
#pragma section(".greg$u",read)
#pragma section(".mreg$u",read)

#define MSVC_ASEG __declspec(allocate(".areg$u"))
#define GCC_ASEG
#define MSVC_PSEG __declspec(allocate(".greg$u"))
#define GCC_PSEG
#define MSVC_MSEG __declspec(allocate(".mreg$u"))
#define GCC_MSEG
#else
#define MSVC_ASEG
#define GCC_ASEG __attribute__((section(SECTION_AREG))) __attribute__((used))
#define MSVC_PSEG
#define GCC_PSEG __attribute__((section(SECTION_GREG))) __attribute__((used))
#define MSVC_MSEG
#define GCC_MSEG __attribute__((section(SECTION_MREG))) __attribute__((used))
#endif


union FPropParam
{
	int i;
	double d;
	const char *s;
	FxExpression *exp;
};

typedef void (*PropHandler)(AActor *defaults, PClassActor *info, Baggage &bag, FPropParam *params);

enum ECategory
{
	CAT_PROPERTY,	// Inheritable property
	CAT_INFO		// non-inheritable info (spawn ID, Doomednum, game filter, conversation ID)
};

struct FPropertyInfo
{
	const char *name;
	const char *params;
	const PClass * const *cls;
	PropHandler Handler;
	int category;
};

FPropertyInfo *FindProperty(const char * string);
int MatchString (const char *in, const char **strings);


#define DEFINE_PROPERTY_BASE(name, paramlist, clas, cat) \
	static void Handler_##name##_##paramlist##_##clas(A##clas *defaults, PClassActor *info, Baggage &bag, FPropParam *params); \
	static FPropertyInfo Prop_##name##_##paramlist##_##clas = \
		{ #name, #paramlist, &RUNTIME_CLASS_CASTLESS(A##clas), (PropHandler)Handler_##name##_##paramlist##_##clas, cat }; \
	MSVC_PSEG FPropertyInfo *infoptr_##name##_##paramlist##_##clas GCC_PSEG = &Prop_##name##_##paramlist##_##clas; \
	static void Handler_##name##_##paramlist##_##clas(A##clas *defaults, PClassActor *info, Baggage &bag, FPropParam *params)

#define DEFINE_PREFIXED_PROPERTY_BASE(prefix, name, paramlist, clas, cat) \
	static void Handler_##name##_##paramlist##_##clas(A##clas *defaults, PClassActor *info, Baggage &bag, FPropParam *params); \
	static FPropertyInfo Prop_##name##_##paramlist##_##clas = \
{ #prefix"."#name, #paramlist, &RUNTIME_CLASS_CASTLESS(A##clas), (PropHandler)Handler_##name##_##paramlist##_##clas, cat }; \
	MSVC_PSEG FPropertyInfo *infoptr_##name##_##paramlist##_##clas GCC_PSEG = &Prop_##name##_##paramlist##_##clas; \
	static void Handler_##name##_##paramlist##_##clas(A##clas *defaults, PClassActor *info, Baggage &bag, FPropParam *params)


#define DEFINE_PROPERTY(name, paramlist, clas) DEFINE_PROPERTY_BASE(name, paramlist, clas, CAT_PROPERTY)
#define DEFINE_INFO_PROPERTY(name, paramlist, clas) DEFINE_PROPERTY_BASE(name, paramlist, clas, CAT_INFO)

#define DEFINE_CLASS_PROPERTY(name, paramlist, clas) DEFINE_PREFIXED_PROPERTY_BASE(clas, name, paramlist, clas, CAT_PROPERTY)
#define DEFINE_CLASS_PROPERTY_PREFIX(prefix, name, paramlist, clas) DEFINE_PREFIXED_PROPERTY_BASE(prefix, name, paramlist, clas, CAT_PROPERTY)

#define PROP_PARM_COUNT (params[0].i)

#define PROP_STRING_PARM(var, no) \
	const char *var = params[(no)+1].s;

#define PROP_EXP_PARM(var, no) \
	FxExpression *var = params[(no)+1].exp;

#define PROP_INT_PARM(var, no) \
	int var = params[(no)+1].i;

#define PROP_FLOAT_PARM(var, no) \
	float var = float(params[(no)+1].d);

#define PROP_DOUBLE_PARM(var, no) \
	double var = params[(no)+1].d;

#define PROP_COLOR_PARM(var, no) \
	int var = params[(no)+1].i== 0? params[(no)+2].i : V_GetColor(NULL, params[(no)+2].s);


// Macros to handle action functions. These are here so that I don't have to
// change every single use in case the parameters change.
#define DECLARE_ACTION(name)	extern VMNativeFunction *name##_VMPtr;

// This distinction is here so that CALL_ACTION produces errors when trying to
// access a function that requires parameters.
#define DEFINE_ACTION_FUNCTION(cls, name) \
	static int AF_##name(VM_ARGS); \
	VMNativeFunction *name##_VMPtr; \
	static const AFuncDesc cls##_##name##_Hook = { #name, AF_##name, &name##_VMPtr }; \
	extern AFuncDesc const *const cls##_##name##_HookPtr; \
	MSVC_ASEG AFuncDesc const *const cls##_##name##_HookPtr GCC_ASEG = &cls##_##name##_Hook; \
	static int AF_##name(VM_ARGS)

#define DEFINE_ACTION_FUNCTION_PARAMS(cls, name) DEFINE_ACTION_FUNCTION(cls, name)

//#define DECLARE_PARAMINFO AActor *self, AActor *stateowner, FState *CallingState, int ParameterIndex, StateCallData *statecall
//#define PUSH_PARAMINFO self, stateowner, CallingState, ParameterIndex, statecall

#define CALL_ACTION(name,self) { /*AF_##name(self, self, NULL, 0, NULL)*/ \
		VMValue params[3] = { self, self, VMValue(NULL, ATAG_STATEINFO) }; \
		stack->Call(name##_VMPtr, params, countof(params), NULL, 0, NULL); \
	}


#define ACTION_RETURN_STATE(v) do { FState *state = v; if (numret > 0) { assert(ret != NULL); ret->SetPointer(state, ATAG_STATE); return 1; } return 0; } while(0)
#define ACTION_RETURN_FLOAT(v) do { double u = v; if (numret > 0) { assert(ret != nullptr); ret->SetFloat(u); return 1; } return 0; } while(0)
#define ACTION_RETURN_INT(v) do { int u = v; if (numret > 0) { assert(ret != NULL); ret->SetInt(u); return 1; } return 0; } while(0)
#define ACTION_RETURN_BOOL(v) ACTION_RETURN_INT(v)

// Checks to see what called the current action function
#define ACTION_CALL_FROM_ACTOR() (stateinfo == nullptr || stateinfo->mStateType == STATE_Actor)
#define ACTION_CALL_FROM_PSPRITE() (self->player && stateinfo != nullptr && stateinfo->mStateType == STATE_Psprite)
#define ACTION_CALL_FROM_INVENTORY() (stateinfo != nullptr && stateinfo->mStateType == STATE_StateChain)
#endif