/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   p_subst_alias.c                                    :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rbousset <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/02/14 17:19:27 by rbousset          #+#    #+#             */
/*   Updated: 2020/02/14 17:19:29 by rbousset         ###   ########lyon.fr   */
/*                                                                            */
/* ************************************************************************** */

#include <libft.h>
#include <stddef.h>

#include "s_struct.h"
#include "u_alias.h"
#include "u_parse.h"
#include "u_utils.h"
#include "u_vars.h"

static char		*p_skip_whitespace(char *ptr)
{
	while (*ptr != C_NUL && ft_iswhitespace(*ptr))
	{
		ptr++;
	}
	return (ptr);
}

static t_bool	p_meet_whitespace(char *head, char *ptr, t_quote_mode mode)
{
	if (mode == Q_NONE && u_is_not_escaped(head, ptr) == TRUE)
	{
		return (TRUE);
	}
	return (FALSE);
}

static char		*p_set_ptr(char *ptr, char word[], t_bool *good, size_t locat[])
{
	t_quote_mode	mode;

	mode = Q_NONE;
	while (*ptr != C_NUL)
	{
		if (*ptr == C_DQUOTE)
			mode = u_meet_dquote(word, ptr, mode);
		if (*ptr == C_SQUOTE)
			mode = u_meet_squote(word, ptr, mode);
		if (mode == Q_NONE && *ptr == C_EQUALS)
			*good = FALSE;
		if (ft_iswhitespace(*ptr) == TRUE
			&& p_meet_whitespace((char*)word, ptr, mode) == TRUE)
		{
			locat[1] = (ptr - word);
			if (*good == TRUE)
				break ;
			else
			{
				ptr = p_skip_whitespace(ptr);
				locat[0] = (ptr - word);
				ptr -= 1;
				*good = TRUE;
			}
		}
		ptr++;
	}
	return (ptr);
}

size_t			p_subst_alias(char word[], t_bool reset, t_msh *msh)
{
	static size_t	used[4096];
	static size_t	i = 0;
	char			value[ARG_MAX];
	char			tmp[255];
	size_t			locat[2];
	size_t			j;
	size_t			usedcmp;
	char			*ptr;
	t_bool			good;

	if (reset == TRUE)
	{
		i = 0;
		while (i < 4096)
		{
			used[i] = 0;
			i++;
		}
		i = 0;
	}
	ptr = word;
	ptr = p_skip_whitespace(ptr);
	good = TRUE;
	locat[0] = (ptr - word);
	locat[1] = (ptr - word);
	ptr = p_set_ptr(ptr, word, &good, locat);
	if (*ptr == C_NUL && good == TRUE)
		locat[1] = (ptr - word);
	if (good == TRUE)
	{
		ft_strlcpy(tmp,
			word + locat[0],
			((locat[1] - locat[0] < 253) ? (locat[1] - locat[0]) : (254)) + 1);
		if ((usedcmp = u_get_alias_value(value, tmp, ARG_MAX, msh)) != 0)
		{
			j = 0;
			good = TRUE;
			while (j < i)
			{
				if (used[j] == usedcmp)
					good = FALSE;
				j++;
			}
			if (good == TRUE)
			{
				(void)ft_memmove(word + (locat[0] + ft_strlen(value)),
					word + locat[1],
					ft_strlen(word + locat[1]) + 1 * sizeof(char));
				(void)ft_memmove(word + locat[0],
					value,
					ft_strlen(value) * sizeof(char));
				used[i] = usedcmp;
				i++;
				return (usedcmp);
			}
		}
	}
	return (0);
}