/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   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.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);
**		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		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);
}

char	*ft_strjoinfree(char const *s1, char const *s2)
{
	char	*str;
	int		len;
	int		j;

	if (!s1 || !s2)
		return (NULL);
	len = ft_strlen(s1) + ft_strlen(s2);
	if (!(str = (char *)malloc(sizeof(char) * (len + 1))))
		return (NULL);
	len = 0;
	j = 0;
	while (s1[j] != '\0')
		str[len++] = s1[j++];
	j = 0;
	while (s2[j] != '\0')
		str[len++] = s2[j++];
	str[len] = '\0';
	free((char*)s1);
	return (str);
}

int		hasnewline(char *str, t_gnlist *lst, char **line)
{
	str[0] = '\0';
	if (!(*line = ft_strdup(lst->string)))
		return (-1);
	ft_memmove(lst->string, str + 1, ft_strlen(str + 1) + 1);
	return (1);
}

void	free_lst(t_gnlist **lst, const int fd)
{
	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);
}

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