/*
 * IGC parser - data linking module (doubly linked datapoint list)
 * @brief parse IGC file, get all data points, compute average horizontal/vertical speed, print to STDOUT
 *
 * As per standard: https://xp-soaring.github.io/igc_file_format/igc_format_2008.html
 *                  https://xp-soaring.github.io/igc_file_format/igc_fr_specification_with_al8_2023-2-1_0.pdf
 *
 * @author xamidev <xamidev@riseup.net>
 * @license GNU GPL v3
 */

#include <stdio.h>
#include <stdlib.h>
#include "igc.h"
#include "linkage.h"

struct dp_node* create_datapoint_list()
{
	struct dp_node* head = (struct dp_node*)calloc(1, sizeof(struct dp_node));

	head->data = NULL;
	head->prev = NULL;
	head->next = NULL;
	return head;	
}

void append_datapoint(struct dp_node* list, struct IGC_DataPoint* dp)
{
	struct dp_node* new = (struct dp_node*)calloc(1, sizeof(struct dp_node));

	if (list->next == NULL)
	{
		list->next = new;
		
		new->prev = list;
		new->next = NULL;
		new->data = dp;
		return;
	}

	while (list->next != NULL)
	{
		list = list->next;
	}

	list->next = new;
	new->prev = list;
	new->next = NULL;
	new->data = dp;
	return;
}

void print_datapoint_list(struct dp_node* list)
{
	if (list->data == NULL)
	{
		// We're at head!
		list = list->next;
	}

	while (list->next != NULL)
	{
		show_datapoint(list->data);
		printf(" <-> ");
		list = list->next;		
	}
	puts("NULL");
	return;
}