/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   e_builtins.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 <sys/wait.h>
#include <libft.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>

#include "m_redirs.h"
#include "s_destroy.h"
#include "s_lcom.h"
#include "s_struct.h"

static void
	e_builtin_child(const t_lcom *ptr,
					uint8_t bu_id,
					t_msh *msh)
{
	int32_t	ret;

	dup_redirs(ptr, msh);
	ret = msh->bu_ptr[bu_id](ptr->argv + 1, msh);
	lcom_clear(&msh->curr);
	s_destroy(msh);
	exit(ret);
}

static void
	e_builtin_parent(pid_t pid,
						const t_lcom *ptr,
						uint8_t bu_id,
						t_msh *msh)
{
	int32_t	status;
	int32_t	ret;

	while (wait(&status) != pid)
		;
	ret = WEXITSTATUS(status);
	if (bu_id != 6)
		msh->ret = ret;
	if (bu_id == 1 && msh->ret == 0)
	{
		msh->bu_ptr[bu_id](ptr->argv + 1, msh);
		/* TODO: export $PWD */
	}
	else if (bu_id == 6 && ret == 0)
	{
		if (ptr->argv[1])
			ret = ft_atoi(ptr->argv[1]);
		else
			ret = msh->ret;
		lcom_clear(&msh->curr);
		s_destroy(msh);
		exit(ret);
	}
}

void
	e_builtin(const t_lcom *ptr,
				uint8_t bu_id,
				t_msh *msh)
{
	pid_t	pid;

	/* TODO: find a way to handle exit | bu_id = 6 */
	if ((pid = fork()) == 0)
	{
		e_builtin_child(ptr, bu_id, msh);
	}
	else if (pid < 0)
	{
		/* TODO: handle fork failed */
	}
	else
	{
		e_builtin_parent(pid, ptr, bu_id, msh);
	}
}