//
// Created by Antoine Bartuccio on 22/05/2018.
//
#include "List.h"

GETTER(List, Element*, head)
GETTER(List, Element*, tail)
GETTER(List, int, size)

Element * get_element_List(THIS(List), int index){
	Element * current = NULL;
	int i;

	if (index < this->size){
		if (index == this->size - 1)
			current = this->tail;
		else if (index == 0)
			current = this->head;
		else if (index <= (this->size - 1) / 2){
			i = 0;
			current = this->head;
			while (i < index){
				current = current->next;
				i++;
			}
		} else {
			i = this->size - 1;
			current = this->tail;
			while (i > index){
				current = current->previous;
				i--;
			}
		}
	} else OUTSIDE_BOUNDS;
	return  current;
}

void * get_element_data_List(THIS(List), int index){
	Element * el = this->get_element(this, index);
	if (el != NULL)
		return el->data;
	return NULL;
}

void * get_head_data_List(THIS(List)){
	if (this->head != NULL)
		return this->head->data;
	return NULL;
}

void * get_tail_data_List(THIS(List)){
	if (this->tail != NULL)
		return this->tail->data;
	return NULL;
}

void _free__List(THIS(List)){
	this->clear(this);
	free(this);
}

void clear_List(THIS(List)){
	Element *current = this->head;
	Element *to_delete = NULL;
	while (current != NULL){
		to_delete = current;
		current = current->next;
		to_delete->list = NULL;
		DELETE(to_delete);
	}
	this->head = NULL;
	this->tail = NULL;
	this->size = 0;
}

void insert_tail_List(THIS(List), void * data, size_t data_size){
	/* Create a new element */
	Element *new_element = NEW(Element, data, data_size, this);
	if (this->tail == NULL){
		this->head = new_element;
		this->tail = new_element;
	} else {
		new_element->previous = this->tail;
		this->tail->next = new_element;
		this->tail = new_element;
	}
}

void insert_head_List(THIS(List), void * data, size_t data_size){
	/* Create a new element */
	Element *new_element = NEW(Element, data, data_size, this);
	if (this->head != NULL)
		this->head->previous = new_element;
	else
		this->tail = new_element;
	new_element->next = this->head;

	this->head = new_element;
}

void insert_inside_List(THIS(List), void * data, size_t data_size, int index){
	Element *new_element = NULL;
	Element *old_element = NULL;

	if (index == 0)
		this->insert_head(this, data, data_size);
	else if (index == this->size)
		this->insert_tail(this, data, data_size);
	else if (index < this->size){
		new_element = NEW(Element, data, data_size, this);
		old_element = this->get_element(this, index);

		new_element->previous = old_element->previous;
		new_element->next = old_element;

		old_element->previous->next = new_element;
		old_element->previous = new_element;

	} else OUTSIDE_BOUNDS;


}

void remove_head_List(THIS(List)){
	DELETE(this->head);
}

void remove_tail_List(THIS(List)){
	DELETE(this->tail);
}

List *_init_List(){
	List *l = (List*) malloc_or_die(sizeof(List));
	l->size = 0;
	l->head = NULL;
	l->tail = NULL;

	LINK_ALL(List, l,
			 get_head,
			 get_tail,
			 get_size,
			 get_head_data,
			 get_tail_data,
			 get_element,
			 get_element_data,
			 insert_inside,
			 insert_tail,
			 insert_head,
			 clear,
			 remove_head,
			 remove_tail
	)
	return l;
}