#include <fx/core/iterator.h>

/*** PRIVATE DATA *************************************************************/

struct fx_iterator_p {
	enum fx_status it_status;
};

/*** PRIVATE FUNCTIONS ********************************************************/

static enum fx_status iterator_get_status(const struct fx_iterator_p *it)
{
	return it->it_status;
}

static enum fx_status iterator_set_status(struct fx_iterator_p *it, fx_status status)
{
	it->it_status = status;
	return FX_SUCCESS;
}

/*** PUBLIC FUNCTIONS *********************************************************/

fx_iterator *fx_iterator_begin(fx_iterable *it)
{
	FX_CLASS_DISPATCH_VIRTUAL_0(fx_iterable, FX_TYPE_ITERABLE, NULL, it_begin, it);
}

const fx_iterator *fx_iterator_cbegin(const fx_iterable *it)
{
	FX_CLASS_DISPATCH_VIRTUAL_0(fx_iterable, FX_TYPE_ITERABLE, NULL, it_cbegin, it);
}

enum fx_status fx_iterator_get_status(const fx_iterator *it)
{
	FX_CLASS_DISPATCH_STATIC_0(FX_TYPE_ITERATOR, iterator_get_status, it);
}

enum fx_status fx_iterator_set_status(const fx_iterator *it, fx_status status)
{
	FX_CLASS_DISPATCH_STATIC(FX_TYPE_ITERATOR, iterator_set_status, it, status);
}

enum fx_status fx_iterator_move_next(const fx_iterator *it)
{
	enum fx_status status = FX_ERR_NOT_SUPPORTED;

	fx_iterator_class *iface = fx_object_get_interface(it, FX_TYPE_ITERATOR);
	if (iface && iface->it_move_next) {
		status = iface->it_move_next(it);
	}

	struct fx_iterator_p *p = fx_object_get_private(it, FX_TYPE_ITERATOR);
	p->it_status = status;

	return status;
}

fx_iterator_value fx_iterator_get_value(fx_iterator *it)
{
	FX_CLASS_DISPATCH_VIRTUAL_0(
		fx_iterator, FX_TYPE_ITERATOR, FX_ITERATOR_VALUE_NULL,
		it_get_value, it);
}

const fx_iterator_value fx_iterator_get_cvalue(const fx_iterator *it)
{
	FX_CLASS_DISPATCH_VIRTUAL_0(
		fx_iterator, FX_TYPE_ITERATOR, FX_ITERATOR_VALUE_NULL,
		it_get_cvalue, it);
}

fx_status fx_iterator_erase(fx_iterator *it)
{
	enum fx_status status = FX_ERR_NOT_SUPPORTED;

	fx_iterator_class *iface = fx_object_get_interface(it, FX_TYPE_ITERATOR);
	if (iface && iface->it_erase) {
		status = iface->it_erase(it);
	}

	struct fx_iterator_p *p = fx_object_get_private(it, FX_TYPE_ITERATOR);
	p->it_status = status;

	return status;
}

/*** CLASS DEFINITION *********************************************************/

// ---- fx_iterator DEFINITION
FX_TYPE_CLASS_DEFINITION_BEGIN(fx_iterator)
	FX_TYPE_CLASS_INTERFACE_BEGIN(fx_object, FX_TYPE_OBJECT)
		FX_INTERFACE_ENTRY(to_string) = NULL;
	FX_TYPE_CLASS_INTERFACE_END(fx_object, FX_TYPE_OBJECT)
FX_TYPE_CLASS_DEFINITION_END(fx_iterator)

FX_TYPE_DEFINITION_BEGIN(fx_iterator)
	FX_TYPE_FLAGS(FX_TYPE_F_ABSTRACT);
	FX_TYPE_ID(0xfd40b67f, 0x7087, 0x40a9, 0x8fd8, 0x8ae27bd58c9e);
	FX_TYPE_CLASS(fx_iterator_class);
	FX_TYPE_INSTANCE_PRIVATE(struct fx_iterator_p);
FX_TYPE_DEFINITION_END(fx_iterator)

// ---- fx_iterable DEFINITION
FX_TYPE_CLASS_DEFINITION_BEGIN(fx_iterable)
	FX_TYPE_CLASS_INTERFACE_BEGIN(fx_object, FX_TYPE_OBJECT)
		FX_INTERFACE_ENTRY(to_string) = NULL;
	FX_TYPE_CLASS_INTERFACE_END(fx_object, FX_TYPE_OBJECT)
FX_TYPE_CLASS_DEFINITION_END(fx_iterable)

FX_TYPE_DEFINITION_BEGIN(fx_iterable)
	FX_TYPE_FLAGS(FX_TYPE_F_ABSTRACT);
	FX_TYPE_ID(0x4bbabf2d, 0xfc5d, 0x40cc, 0x89fc, 0x164085e47f73);
	FX_TYPE_CLASS(fx_iterable_class);
FX_TYPE_DEFINITION_END(fx_iterable)