/*
** binding-util.h
**
** This file is part of mkxp.
**
** Copyright (C) 2013 Jonas Kulla <Nyocurio@gmail.com>
**
** mkxp 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.
**
** mkxp 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 mkxp.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef BINDING_UTIL_H
#define BINDING_UTIL_H

#include <ruby.h>
#include <ruby/version.h>

#include "exception.h"

// Ruby 1.8 and Ruby 1.9+ use different version macros
#ifndef RUBY_API_VERSION_MAJOR
#define RUBY_API_VERSION_MAJOR RUBY_VERSION_MAJOR
#endif

#ifndef RUBY_API_VERSION_MINOR
#define RUBY_API_VERSION_MINOR RUBY_VERSION_MINOR
#endif

#if RUBY_API_VERSION_MAJOR == 1
#define PRIsVALUE "s"
#define RB_OBJ_CLASSNAME(obj) rb_obj_classname(obj)
#define RB_OBJ_STRING(obj) StringValueCStr(obj)

NORETURN(void rb_error_arity(int, int, int));

#define OBJ_INIT_COPY(obj, orig) \
	((obj) != (orig) && (rb_obj_init_copy((obj), (orig)), 1))
#if RUBY_API_VERSION_MINOR == 8
// Makes version checks easier
#define RUBY_LEGACY_VERSION
// Functions and macros providing Ruby 1.8 compatibililty
#define FLONUM_P(x) 0

#define RB_FLOAT_TYPE_P(obj) (FLONUM_P(obj) || (!SPECIAL_CONST_P(obj) && BUILTIN_TYPE(obj) == T_FLOAT))

#define RB_TYPE_P(obj, type) ( \
	((type) == T_FIXNUM) ? FIXNUM_P(obj) : \
	((type) == T_TRUE) ? ((obj) == Qtrue) : \
	((type) == T_FALSE) ? ((obj) == Qfalse) : \
	((type) == T_NIL) ? ((obj) == Qnil) : \
	((type) == T_UNDEF) ? ((obj) == Qundef) : \
	((type) == T_SYMBOL) ? SYMBOL_P(obj) : \
        ((type) == T_FLOAT) ? RB_FLOAT_TYPE_P(obj) : \
	(!SPECIAL_CONST_P(obj) && BUILTIN_TYPE(obj) == (type)))

#define RUBY_T_ARRAY T_ARRAY
#define RUBY_T_STRING T_STRING
#define RUBY_T_FLOAT T_FLOAT
#define RUBY_T_FIXNUM T_FIXNUM
#define RUBY_T_TRUE T_TRUE
#define RUBY_T_FALSE T_FALSE
#define RUBY_T_NIL T_NIL

#define rb_str_new_cstr rb_str_new2

#define RUBY_DEFAULT_FREE ((RUBY_DATA_FUNC)-1)
#define RUBY_NEVER_FREE   ((RUBY_DATA_FUNC)0)
#define RUBY_TYPED_DEFAULT_FREE RUBY_DEFAULT_FREE
#define RUBY_TYPED_NEVER_FREE   RUBY_NEVER_FREE

#define RTYPEDDATA_DATA DATA_PTR

#define RFLOAT_VALUE(d) RFLOAT(d)->value

#define ENCODING_INLINE_MAX 127
#define ENCODING_SHIFT (FL_USHIFT+10)
#define ENCODING_MASK (((VALUE)ENCODING_INLINE_MAX)<<ENCODING_SHIFT) /* FL_USER10|FL_USER11|FL_USER12|FL_USER13|FL_USER14|FL_USER15|FL_USER16 */

#define ENCODING_SET_INLINED(obj,i) do {\
	RBASIC(obj)->flags &= ~ENCODING_MASK;\
	RBASIC(obj)->flags |= (VALUE)(i) << ENCODING_SHIFT;\
} while (0)
#define ENCODING_SET(obj,i) rb_enc_set_index((obj), (i))

#define ENCODING_GET_INLINED(obj) (int)((RBASIC(obj)->flags & ENCODING_MASK)>>ENCODING_SHIFT)
#define ENCODING_GET(obj) \
	(ENCODING_GET_INLINED(obj) != ENCODING_INLINE_MAX ? \
	ENCODING_GET_INLINED(obj) : \
	rb_enc_get_index(obj))

#define ENCODING_IS_ASCII8BIT(obj) (ENCODING_GET_INLINED(obj) == 0)

typedef struct {
	const char *wrap_struct_name;
	struct {
		void (*dmark)(void*);
		void (*dfree)(void*);
		size_t (*dsize)(const void *);
		void *reserved[2];
	} function;
	const char *parent;
	void *data;
	VALUE flags;
} rb_data_type_t;

VALUE rb_sprintf(const char* fmt, ...);

VALUE rb_data_typed_object_alloc(VALUE klass, void *datap, const rb_data_type_t *);

void *rb_check_typeddata(VALUE, const rb_data_type_t *);

#define Check_TypedStruct(v,t) rb_check_typeddata((VALUE)(v),(t))

typedef void rb_encoding;

VALUE rb_enc_str_new(const char*, long, rb_encoding*);

rb_encoding *rb_utf8_encoding(void);

void rb_enc_set_default_external(VALUE encoding);

VALUE rb_enc_from_encoding(rb_encoding *enc);

VALUE rb_str_catf(VALUE, const char*, ...);

VALUE rb_errinfo(void);

int rb_typeddata_is_kind_of(VALUE, const rb_data_type_t *);

VALUE rb_file_open_str(VALUE, const char*);

VALUE rb_enc_associate_index(VALUE, int);

int rb_utf8_encindex(void);

VALUE rb_hash_lookup2(VALUE, VALUE, VALUE);

#endif // RUBY_API_VERSION_MINOR == 8
#endif // RUBY_API_VERSION_MAJOR == 1

enum RbException
{
	RGSS = 0,
	Reset,
	PHYSFS,
	SDL,
	MKXP,

	ErrnoENOENT,

	IOError,

	TypeError,
	ArgumentError,

	RbExceptionsMax
};

struct RbData
{
	VALUE exc[RbExceptionsMax];

	/* Input module (RGSS3) */
	VALUE buttoncodeHash;

	RbData();
	~RbData();
};

RbData *getRbData();

struct Exception;

void
raiseRbExc(const Exception &exc);

#define DECL_TYPE(Klass) \
	extern rb_data_type_t Klass##Type

/* 2.1 has added a new field (flags) to rb_data_type_t */
#if RUBY_API_VERSION_MAJOR > 1 && RUBY_API_VERSION_MINOR > 0
/* TODO: can mkxp use RUBY_TYPED_FREE_IMMEDIATELY here? */
#define DEF_TYPE_FLAGS 0
#else
#define DEF_TYPE_FLAGS
#endif

#define DEF_TYPE_CUSTOMNAME_AND_FREE(Klass, Name, Free) \
	rb_data_type_t Klass##Type = { \
		Name, { 0, Free, 0, { 0, 0 } }, 0, 0, DEF_TYPE_FLAGS \
	}

#define DEF_TYPE_CUSTOMFREE(Klass, Free) \
	DEF_TYPE_CUSTOMNAME_AND_FREE(Klass, #Klass, Free)

#define DEF_TYPE_CUSTOMNAME(Klass, Name) \
	DEF_TYPE_CUSTOMNAME_AND_FREE(Klass, Name, freeInstance<Klass>)

#define DEF_TYPE(Klass) DEF_TYPE_CUSTOMNAME(Klass, #Klass)

template<rb_data_type_t *rbType>
static VALUE classAllocate(VALUE klass)
{
	return rb_data_typed_object_alloc(klass, 0, rbType);
}

template<class C>
static void freeInstance(void *inst)
{
	delete static_cast<C*>(inst);
}

void
raiseDisposedAccess(VALUE self);

template<class C>
inline C *
getPrivateData(VALUE self)
{
	C *c = static_cast<C*>(RTYPEDDATA_DATA(self));

	return c;
}

template<class C>
static inline C *
getPrivateDataCheck(VALUE self, const rb_data_type_t &type)
{
	void *obj = Check_TypedStruct(self, &type);
	return static_cast<C*>(obj);
}

static inline void
setPrivateData(VALUE self, void *p)
{
	RTYPEDDATA_DATA(self) = p;
}

inline VALUE
wrapObject(void *p, const rb_data_type_t &type,
           VALUE underKlass = rb_cObject)
{
	VALUE klass = rb_const_get(underKlass, rb_intern(type.wrap_struct_name));
	VALUE obj = rb_obj_alloc(klass);

	setPrivateData(obj, p);

	return obj;
}

inline VALUE
wrapProperty(VALUE self, void *prop, const char *iv,
             const rb_data_type_t &type,
             VALUE underKlass = rb_cObject)
{
	VALUE propObj = wrapObject(prop, type, underKlass);

	rb_iv_set(self, iv, propObj);

	return propObj;
}

/* Implemented: oSszfibn| */
int
rb_get_args(int argc, VALUE *argv, const char *format, ...);

/* Always terminate 'rb_get_args' with this */
#ifndef NDEBUG
#  define RB_ARG_END_VAL ((void*) -1)
#  define RB_ARG_END ,RB_ARG_END_VAL
#else
#  define RB_ARG_END
#endif

typedef VALUE (*RubyMethod)(int argc, VALUE *argv, VALUE self);

static inline void
_rb_define_method(VALUE klass, const char *name, RubyMethod func)
{
	rb_define_method(klass, name, RUBY_METHOD_FUNC(func), -1);
}

static inline void
rb_define_class_method(VALUE klass, const char *name, RubyMethod func)
{
	rb_define_singleton_method(klass, name, RUBY_METHOD_FUNC(func), -1);
}

static inline void
_rb_define_module_function(VALUE module, const char *name, RubyMethod func)
{
	rb_define_module_function(module, name, RUBY_METHOD_FUNC(func), -1);
}

#define GUARD_EXC(exp) \
{ try { exp } catch (const Exception &exc) { raiseRbExc(exc); } }

template<class C>
static inline VALUE
objectLoad(int argc, VALUE *argv, VALUE self)
{
	const char *data;
	int dataLen;
	rb_get_args(argc, argv, "s", &data, &dataLen RB_ARG_END);

	VALUE obj = rb_obj_alloc(self);

	C *c = 0;

	GUARD_EXC( c = C::deserialize(data, dataLen); );

	setPrivateData(obj, c);

	return obj;
}

static inline VALUE
rb_bool_new(bool value)
{
	return value ? Qtrue : Qfalse;
}

inline void
rb_float_arg(VALUE arg, double *out, int argPos = 0)
{
	switch (rb_type(arg))
	{
	case RUBY_T_FLOAT :
		*out = RFLOAT_VALUE(arg);
		break;

	case RUBY_T_FIXNUM :
		*out = FIX2INT(arg);
		break;

	default:
		rb_raise(rb_eTypeError, "Argument %d: Expected float", argPos);
	}
}

inline void
rb_int_arg(VALUE arg, int *out, int argPos = 0)
{
	switch (rb_type(arg))
	{
	case RUBY_T_FLOAT :
		// FIXME check int range?
		*out = NUM2LONG(arg);
		break;

	case RUBY_T_FIXNUM :
		*out = FIX2INT(arg);
		break;

	default:
		rb_raise(rb_eTypeError, "Argument %d: Expected fixnum", argPos);
	}
}

inline void
rb_bool_arg(VALUE arg, bool *out, int argPos = 0)
{
	switch (rb_type(arg))
	{
	case RUBY_T_TRUE :
		*out = true;
		break;

	case RUBY_T_FALSE :
	case RUBY_T_NIL :
		*out = false;
		break;

	default:
		rb_raise(rb_eTypeError, "Argument %d: Expected bool", argPos);
	}
}

inline void
rb_check_argc(int actual, int expected)
{
	if (actual != expected)
		rb_raise(rb_eArgError, "wrong number of arguments (%d for %d)",
		         actual, expected);
}

#define RB_METHOD(name) \
	static VALUE name(int argc, VALUE *argv, VALUE self)

#define RB_UNUSED_PARAM \
	{ (void) argc; (void) argv; (void) self; }

#define MARSH_LOAD_FUN(Typ) \
	RB_METHOD(Typ##Load) \
	{ \
		return objectLoad<Typ>(argc, argv, self); \
	}

#define INITCOPY_FUN(Klass) \
	RB_METHOD(Klass##InitializeCopy) \
	{ \
		VALUE origObj; \
		rb_get_args(argc, argv, "o", &origObj RB_ARG_END); \
		if (!OBJ_INIT_COPY(self, origObj)) /* When would this fail??*/\
			return self; \
		Klass *orig = getPrivateData<Klass>(origObj); \
		Klass *k = 0; \
		GUARD_EXC( k = new Klass(*orig); ) \
		setPrivateData(self, k); \
		return self; \
	}

/* Object property which is copied by reference, with allowed NIL
 * FIXME: Getter assumes prop is disposable,
 * because self.disposed? is not checked in this case.
 * Should make this more clear */
#define DEF_PROP_OBJ_REF(Klass, PropKlass, PropName, prop_iv) \
	RB_METHOD(Klass##Get##PropName) \
	{ \
		RB_UNUSED_PARAM; \
		return rb_iv_get(self, prop_iv); \
	} \
	RB_METHOD(Klass##Set##PropName) \
	{ \
		RB_UNUSED_PARAM; \
		rb_check_argc(argc, 1); \
		Klass *k = getPrivateData<Klass>(self); \
		VALUE propObj = *argv; \
		PropKlass *prop; \
		if (NIL_P(propObj)) \
			prop = 0; \
		else \
			prop = getPrivateDataCheck<PropKlass>(propObj, PropKlass##Type); \
		GUARD_EXC( k->set##PropName(prop); ) \
		rb_iv_set(self, prop_iv, propObj); \
		return propObj; \
	}

/* Object property which is copied by value, not reference */
#define DEF_PROP_OBJ_VAL(Klass, PropKlass, PropName, prop_iv) \
	RB_METHOD(Klass##Get##PropName) \
	{ \
		RB_UNUSED_PARAM; \
		checkDisposed<Klass>(self); \
		return rb_iv_get(self, prop_iv); \
	} \
	RB_METHOD(Klass##Set##PropName) \
	{ \
		rb_check_argc(argc, 1); \
		Klass *k = getPrivateData<Klass>(self); \
		VALUE propObj = *argv; \
		PropKlass *prop; \
		prop = getPrivateDataCheck<PropKlass>(propObj, PropKlass##Type); \
		GUARD_EXC( k->set##PropName(*prop); ) \
		return propObj; \
	}

#define DEF_PROP(Klass, type, PropName, arg_fun, value_fun) \
	RB_METHOD(Klass##Get##PropName) \
	{ \
		RB_UNUSED_PARAM; \
		Klass *k = getPrivateData<Klass>(self); \
		type value = 0; \
		GUARD_EXC( value = k->get##PropName(); ) \
		return value_fun(value); \
	} \
	RB_METHOD(Klass##Set##PropName) \
	{ \
		rb_check_argc(argc, 1); \
		Klass *k = getPrivateData<Klass>(self); \
		type value; \
		rb_##arg_fun##_arg(*argv, &value); \
		GUARD_EXC( k->set##PropName(value); ) \
		return *argv; \
	}

#define DEF_PROP_I(Klass, PropName) \
	DEF_PROP(Klass, int, PropName, int, rb_fix_new)

#define DEF_PROP_F(Klass, PropName) \
	DEF_PROP(Klass, double, PropName, float, rb_float_new)

#define DEF_PROP_B(Klass, PropName) \
	DEF_PROP(Klass, bool, PropName, bool, rb_bool_new)

#define INIT_PROP_BIND(Klass, PropName, prop_name_s) \
{ \
	_rb_define_method(klass, prop_name_s, Klass##Get##PropName); \
	_rb_define_method(klass, prop_name_s "=", Klass##Set##PropName); \
}

#endif // BINDING_UTIL_H