#pragma once

#if 1
#define ITER_CONST const
#else
#define ITER_CONST
#endif

#define FOREACH_ARRAY(arr, start, end, cond, body) MACRO_BEGIN \
	for (int _i = start; _i < end; ++_i) \
	{ \
		const noref int i = _i; \
		ITER_CONST noref entity it = arr[i]; \
		if (cond) \
			LAMBDA(body) \
	} \
MACRO_END

#define FOREACH(list, cond, body) FOREACH_LIST(list, enemy, cond, body)

#define FOREACH_LIST(list, next, cond, body) MACRO_BEGIN \
	int _i = 0; \
	for (entity _it = list##_first, _next = NULL; _it; (_it = _next, ++_i)) \
	{ \
		const noref int i = _i; \
		ITER_CONST noref entity it = _it; \
		_next = _it.next; \
		if (cond) \
			LAMBDA(body) \
	} \
MACRO_END

#define FOREACH_WORD(words, cond, body) MACRO_BEGIN \
	string _words = words; \
	int _i = 0; \
	for (string _it; (_it = car(_words)); (_words = cdr(_words), ++_i)) \
	{ \
		const noref int i = _i; \
		const noref string it = _it; \
		if (cond) \
			LAMBDA(body) \
	} \
MACRO_END

#define STRING_ITERATOR(this, s, i) \
	string this##_s = s; \
	int this##_i = i

#define STRING_ITERATOR_SET(this, s, i) MACRO_BEGIN \
	this##_s = s; \
	this##_i = i; \
MACRO_END

#define STRING_ITERATOR_GET(this) str2chr(this##_s, this##_i++)
#define STRING_ITERATOR_PEEK(this) str2chr(this##_s, this##_i)
#define STRING_ITERATOR_NEXT(this) MACRO_BEGIN ++this##_i; MACRO_END
#define STRING_ITERATOR_UNGET(this) MACRO_BEGIN --this##_i; MACRO_END
#define STRING_ITERATOR_SAVE(this) this##_i
#define STRING_ITERATOR_LOAD(this, n) MACRO_BEGIN this##_i = n; MACRO_END

#define FOREACH_CHAR(s, cond, body) MACRO_BEGIN \
	STRING_ITERATOR(iter, s, 0); \
	int _it; \
	while ((_it = STRING_ITERATOR_GET(iter)) > 0) \
	{ \
		const noref int it = _it; \
		if (cond) \
			LAMBDA(body) \
	} \
MACRO_END

#ifdef CSQC
	entity(entity start, .string fld, string match) _findstring = #18;
	entity(.string fld, string match, .entity tofield) _findchainstring_tofield = #402;

	entity(entity start, .entity fld, entity match) _findentity = #98;
	entity(.entity fld, entity match, .entity tofield) _findchainentity_tofield = #403;

	entity(entity start, .float fld, float match) _findfloat = #98;
	entity(.float fld, float match, .entity tofield) _findchainfloat_tofield = #403;

	entity(entity start, .float fld, float match) _findflags = #449;
	entity(.float fld, float match, .entity tofield) _findchainflags_tofield = #450;
#elifdef SVQC
	entity(entity start, .string fld, string match) _findstring = #18;
	entity(.string fld, string match, .entity tofield) _findchainstring_tofield = #402;

	entity(entity start, .entity fld, entity match) _findentity = #98;
	entity(.entity fld, entity match, .entity tofield) _findchainentity_tofield = #403;

	entity(entity start, .float fld, float match) _findfloat = #98;
	entity(.float fld, float match, .entity tofield) _findchainfloat_tofield = #403;

	entity(entity start, .float fld, float match) _findflags = #449;
	entity(.float fld, float match, .entity tofield) _findchainflags_tofield = #450;
#elifdef MENUQC
	entity(entity start, .string fld, string match) _findstring = #24;
	entity(.string fld, string match, .entity tofield) _findchainstring_tofield = #26;

	entity(entity start, .entity fld, entity match) _findentity = #25;
	entity(.entity fld, entity match, .entity tofield) _findchainentity_tofield = #27;

	entity(entity start, .float fld, float match) _findfloat = #25;
	entity(.float fld, float match, .entity tofield) _findchainfloat_tofield = #27;

	entity(entity start, .float fld, float match) _findflags = #87;
	entity(.float fld, float match, .entity tofield) _findchainflags_tofield = #88;
#endif

#define ORDERED(F) F##_UNORDERED
#define _FOREACH_ENTITY_FIND_ORDERED(T, fld, match, cond, body) MACRO_BEGIN \
	int _i = 0; \
	for (entity _it = NULL; (_it = _find##T(_it, fld, match)); ++_i) \
	{ \
		const noref int i = _i; \
		ITER_CONST noref entity it = _it; \
		if (cond) \
			LAMBDA(body) \
	} \
MACRO_END
#define MUTEX_LOCK(this) MACRO_BEGIN \
	if (this) \
		LOG_SEVEREF("Loop mutex held by %s", this); \
	this = __FUNC__; \
MACRO_END
#define MUTEX_UNLOCK(this) MACRO_BEGIN \
	this = string_null; \
MACRO_END
#define _FOREACH_ENTITY_FIND_UNORDERED(id, T, fld, match, cond, body) MACRO_BEGIN \
	MUTEX_LOCK(_FOREACH_ENTITY_FIND_##T##_##id##mutex); \
	entity _foundchain_first = _findchain##T##_tofield(fld, match, _FOREACH_ENTITY_FIND_##T##_next##id); \
	FOREACH_LIST(_foundchain, _FOREACH_ENTITY_FIND_##T##_next##id, cond, body); \
	MUTEX_UNLOCK(_FOREACH_ENTITY_FIND_##T##_##id##mutex); \
MACRO_END

#define FOREACH_ENTITY(cond, body) ORDERED(FOREACH_ENTITY)(cond, body)
#define FOREACH_ENTITY_ORDERED(cond, body) MACRO_BEGIN \
	int _i = 0; \
	for (entity _it = NULL; (_it = nextent(_it)); ++_i) \
	{ \
		const noref int i = _i; \
		ITER_CONST noref entity it = _it; \
		if (cond) \
			LAMBDA(body) \
	} \
MACRO_END

/// Marker field, always NULL
.entity _FOREACH_ENTITY_fld;
.entity _FOREACH_ENTITY_FIND_entity_nextall; noref string _FOREACH_ENTITY_FIND_entity_allmutex;
#define FOREACH_ENTITY_UNORDERED(cond, body) _FOREACH_ENTITY_FIND_UNORDERED(all, entity, _FOREACH_ENTITY_fld, NULL, cond, body)

#define FOREACH_ENTITY_FLAGS(fld, match, body) ORDERED(FOREACH_ENTITY_FLAGS)(fld, match, body)
#define FOREACH_ENTITY_FLAGS_ORDERED(fld, match, body) _FOREACH_ENTITY_FIND_ORDERED(flags, fld, match, true, body)
.entity _FOREACH_ENTITY_FIND_flags_next; noref string _FOREACH_ENTITY_FIND_flags_mutex;
#define FOREACH_ENTITY_FLAGS_UNORDERED(fld, match, body) _FOREACH_ENTITY_FIND_UNORDERED(, flags, fld, match, true, body)

#ifdef GAMEQC
entity(vector org, float rad, .entity tofield) _findchainradius_tofield = #22;
#define FOREACH_ENTITY_RADIUS(org, dist, cond, body) ORDERED(FOREACH_ENTITY_RADIUS)(org, dist, cond, body)
.entity _FOREACH_ENTITY_FIND_radius_next; noref string _FOREACH_ENTITY_FIND_radius_mutex;
#define FOREACH_ENTITY_RADIUS_UNORDERED(org, dist, cond, body) _FOREACH_ENTITY_FIND_UNORDERED(, radius, org, dist, cond, body)
.entity _FOREACH_ENTITY_FIND_radius_nexttmp; noref string _FOREACH_ENTITY_FIND_radius_tmpmutex;
#define FOREACH_ENTITY_RADIUS_ORDERED(org, dist, cond, body) \
MACRO_BEGIN \
	entity _rev_first = NULL; \
	_FOREACH_ENTITY_FIND_UNORDERED(tmp, radius, org, dist, cond, (it._FOREACH_ENTITY_FIND_radius_nexttmp = _rev_first, _rev_first = it)); \
	MUTEX_LOCK(_FOREACH_ENTITY_FIND_radius_tmpmutex); \
	FOREACH_LIST(_rev, _FOREACH_ENTITY_FIND_radius_nexttmp, true, body); \
	MUTEX_UNLOCK(_FOREACH_ENTITY_FIND_radius_tmpmutex); \
MACRO_END
#endif

#define FOREACH_ENTITY_FLOAT(fld, match, body) ORDERED(FOREACH_ENTITY_FLOAT)(fld, match, body)
#define FOREACH_ENTITY_FLOAT_ORDERED(fld, match, body) _FOREACH_ENTITY_FIND_ORDERED(float, fld, match, true, body)
.entity _FOREACH_ENTITY_FIND_float_next; noref string _FOREACH_ENTITY_FIND_float_mutex;
#define FOREACH_ENTITY_FLOAT_UNORDERED(fld, match, body) _FOREACH_ENTITY_FIND_UNORDERED(, float, fld, match, true, body)

#define FOREACH_ENTITY_ENT(fld, match, body) ORDERED(FOREACH_ENTITY_ENT)(fld, match, body)
#define FOREACH_ENTITY_ENT_ORDERED(fld, match, body) _FOREACH_ENTITY_FIND_ORDERED(entity, fld, match, true, body)
.entity _FOREACH_ENTITY_FIND_entity_next; noref string _FOREACH_ENTITY_FIND_entity_mutex;
#define FOREACH_ENTITY_ENT_UNORDERED(fld, match, body) _FOREACH_ENTITY_FIND_UNORDERED(, entity, fld, match, true, body)

#define FOREACH_ENTITY_STRING(fld, match, body) ORDERED(FOREACH_ENTITY_STRING)(fld, match, body)
#define FOREACH_ENTITY_STRING_ORDERED(fld, match, body) _FOREACH_ENTITY_FIND_ORDERED(string, fld, match, true, body)
.entity _FOREACH_ENTITY_FIND_string_next; noref string _FOREACH_ENTITY_FIND_string_mutex;
#define FOREACH_ENTITY_STRING_UNORDERED(fld, match, body) _FOREACH_ENTITY_FIND_UNORDERED(, string, fld, match, true, body)

#define FOREACH_ENTITY_CLASS(class, cond, body) ORDERED(FOREACH_ENTITY_CLASS)(class, cond, body)
#define FOREACH_ENTITY_CLASS_ORDERED(class, cond, body) _FOREACH_ENTITY_FIND_ORDERED(string, classname, class, cond, body)
.entity _FOREACH_ENTITY_FIND_string_nextclazz; noref string _FOREACH_ENTITY_FIND_string_clazzmutex;
#define FOREACH_ENTITY_CLASS_UNORDERED(class, cond, body) _FOREACH_ENTITY_FIND_UNORDERED(clazz, string, classname, class, cond, body)
