/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line.c                                    :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: hulamy <marvin@42.fr>                      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/12/21 00:28:33 by hulamy            #+#    #+#             */
/*   Updated: 2019/12/21 00:28:39 by hulamy           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line_bonus.h"

/*
**	//-g -fsanitize=address
**	//:set noendofline binary
**	//https://github.com/charMstr/GNL_lover
**	//https://github.com/mrjvs/42cursus_gnl_tests
**	//https://github.com/Sherchryst/gnlkiller
**	//https://github.com/Hellio404/Get_Next_Line_Tester
**	//https://github.com/TinfoilPancakes/get-next-line-testing-tools
**
**	#include <stdio.h>	//for printf
**	#include <fcntl.h>	//for open
**
**	int		main(int ac, char **av)
**	{
**		int		*fd;
**		int		i;
**		int		j;
**		int		ret;
**		char	*line;
**
**	//	if (ac < 2)
**	//		return (0);
**
**	//	(void)i;(void)j;
**	//	line = NULL;
**	//	fd[0] = open(av[1], O_RDONLY);
**	//	ret = 1;
**	//	while (ret)
**	//	{
**	//		ret = get_next_line(fd[0], &line);
**	//		printf("[%i] %s\n", ret, line);
**	//	}
**
**		line = NULL;
**		i = 0;
**		if (!(fd = (int *)malloc(sizeof(int) * ac)))
**			return (0);
**		while (++i <= ac - 1)
**			fd[i - 1] = open(av[i], O_RDONLY);
**		i = 0;
**		j = 0;
**		while (j < ac - 1)
**		{
**			if ((ret = get_next_line(fd[i], &line)) > 0)
**			{
**				printf("[fd%i-%i] %s\n", fd[i], ret, line);
**				free(line);
**				j = 0;
**			}
**			else
**			{
**				printf("[fd%i-%i]*FINI*\n", fd[i], ret);
**				j++;
**			}
**			i++;
**			if (i >= ac - 1)
**				i = 0;
**		}
**		free (fd);
**		//while (1);
**		return (0);
**	}
*/

int		free_lst(t_gnlist **lst, const int fd, int ret)
{
	t_gnlist	*tmp;

	tmp = *lst;
	while ((*lst)->next && (*lst)->next->lfd != fd)
		(*lst) = (*lst)->next;
	free(tmp->string);
	(*lst)->next = (*lst)->next->next;
	free(tmp);
	return (ret);
}

int		multi_fd(int fd, t_gnlist **lst)
{
	t_gnlist	*tmp;

	tmp = *lst;
	while (*lst && (*lst)->lfd != fd && (*lst)->next != tmp)
		*lst = (*lst)->next;
	if (!tmp || ((*lst)->next == tmp && (*lst)->lfd != fd))
	{
		if (!(tmp = (t_gnlist*)malloc(sizeof(*tmp))))
			return (0);
		tmp->lfd = fd;
		if (!(tmp->string = ft_strdup("")))
			return (0);
		if (*lst)
		{
			tmp->next = (*lst)->next;
			(*lst)->next = tmp;
		}
		else
			tmp->next = tmp;
		*lst = tmp;
	}
	return (1);
}

int		get_next_line(const int fd, char **line)
{
	char				buf[BUFFER_SIZE + 1];
	int					ret;
	static t_gnlist		*lst = NULL;
	char				*str;

	ret = 1;
	if (!(multi_fd(fd, &lst)) || !line || BUFFER_SIZE < 1)
		return (free_lst(&lst, fd, -1));
	while (!(str = ft_strchr(lst->string, '\n')) && ret != 0)
	{
		if ((ret = read(fd, buf, BUFFER_SIZE)) < 0)
			return (free_lst(&lst, fd, -1));
		buf[ret] = '\0';
		if (!(lst->string = ft_strjoinfree(lst->string, buf)))
			return (free_lst(&lst, fd, -1));
	}
	if (str != NULL)
	{
		str[0] = '\0';
		if (!(*line = ft_strdup(lst->string)))
			return (free_lst(&lst, fd, -1));
		ft_memmove(lst->string, str + 1, ft_strlen(str + 1) + 1);
		return (1);
	}
	return (free_lst(&lst, fd, 0));
}