/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   shell_loop.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/10/04 05:59:26 by lperrey           #+#    #+#             */
/*   Updated: 2021/11/16 13:12:52 by hulamy           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "minishell.h"

void	close_fd(t_cmd *cmd);
void	execute_cmd(char **envp, t_cmd **cmd_arr, t_all *c);

void	shell_loop(t_all *c)
{
	char	*line_input;

	line_input = NULL;
	while (1)
	{
		if (line_input)
			free(line_input);
		line_input = readline(c->prompt);
		if (line_input && *line_input)
		{
			add_history(line_input);
			c->token_list = input_to_tokens(line_input);
			c->cmd_arr = parsing(c->token_list, c->envp);
			execute_cmd(c->envp, c->cmd_arr, c);
			ft_lstclear((t_list **)&c->token_list, free);
		}
		else if (!line_input)
		{
			write(1, "exit\n", 5);
			exit(0);
		}
	}
}

void	close_fd(t_cmd *cmd)
{
	if (cmd->fd_in != 0)
		close(cmd->fd_in);
	if (cmd->fd_out != 1)
		close(cmd->fd_out);
}

void	execute_cmd(char **envp, t_cmd **cmd_arr, t_all *c)
{
	pid_t	pid;
	pid_t	wpid;
	int		wstatus;
	int		i;
	int		argc;

	// put signal handling for SIGINT to ignore so parent process will not activate signal_handling_executiv while childs are in process
	c->signal_behaviour.sa_handler = SIG_IGN;
	sigaction(SIGINT, &c->signal_behaviour, NULL);
	i = 0;
	while(cmd_arr[i])
	{
		pid = fork();
		if (pid == 0)
		{
			// activate singal handling for execution mode
			c->signal_behaviour.sa_handler = sigint_handler_execution;
			sigaction(SIGINT, &c->signal_behaviour, NULL);
			if (cmd_arr[i]->fd_in != 0)
				dup2(cmd_arr[i]->fd_in, STDIN_FILENO);
			if (cmd_arr[i]->fd_out != 1)
				dup2(cmd_arr[i]->fd_out, STDOUT_FILENO);
			close_fd(cmd_arr[i]);
			if (cmd_arr[i]->builtin_command)
			{
				argc = 0;
				while (cmd_arr[i]->argv[argc])
					argc++;
				cmd_arr[i]->builtin_command(argc, cmd_arr[i]->argv, c);
				exit(0);
			}
			else
			{
				write(1, "1", 1);
				execve(cmd_arr[i]->argv[0], cmd_arr[i]->argv, envp);
			}
		}
		else
			close_fd(cmd_arr[i]);
		i++;
	}
	// waitpid pour la derniere commande (pour '$?')
	wpid = 1;
	while (wpid > 0)
		wpid = wait(&wstatus);
	// to print a \n after execve was terminated by a signal
	if (WIFSIGNALED(wstatus))
		write(1, "\n", 1);
	// put signal handling for sigint back to the signal handler for interactiv mode
	c->signal_behaviour.sa_handler = sigint_handler_interactiv;
	sigaction(SIGINT, &c->signal_behaviour, NULL);
}