# include <stdlib.h>
# include <unistd.h>
# include <readline/readline.h>
# include <signal.h>
# include <sys/wait.h>

void	handler_sigint(int id)
{
	(void)id;
	write(1, "\n", 1);
	rl_replace_line("", 1);
	rl_on_new_line();
	rl_redisplay();
}

void	handler_sigint_execution(int id)
{
	(void)id;
	write(1, "\n", 1);
	exit(0);
}

int	main(int argc, char *argv[], char *envp[])
{
	(void)argc;
	(void)argv;
	char	*line_input;
	char	*prompt;
	pid_t	pid;
	char	**argvtmp;
	int		wstatus;

	signal(SIGINT, handler_sigint); // signal handling for SINGINT while interactive mode
	line_input = NULL;
	prompt = strdup("\e[0;31m>\e[0m ");
	while (1)
	{
		if (line_input)
			free(line_input);
		line_input = readline(prompt);
		if (line_input && *line_input)
		{
			signal(SIGINT, SIG_IGN); // stop signal handling for SIGINT because end of interactive mode
			pid = fork();
			if (pid == 0)
			{
				signal(SIGINT, handler_sigint_execution); // start signal handling for SIGINT in child process
				if (!strncmp("sleep", line_input, 5))
				{
					argvtmp = malloc(sizeof(char*) * 3);
					argvtmp[0] = strdup("sleep");
					argvtmp[1] = strdup("2");
					argvtmp[2] = NULL;
					execve("/bin/sleep", argvtmp, envp);
				}
				else if (!strncmp("echo", line_input, 4))
				{
					write(1, "3", 2);
					sleep(1);
					write(1, "\b2", 2);
					sleep(1);
					write(1, "\b1", 2);
					sleep(1);
					write(1, "\b0\n", 3);
					execve("/bin/echo", argv, envp);
				}
				else
				{
					write(1, line_input, strlen(line_input));
					write(1, " 3", 2);
					sleep(1);
					write(1, "\b2", 2);
					sleep(1);
					write(1, "\b1", 2);
					sleep(1);
					write(1, "\b0\n", 3);
					exit(0);
				}
			}
			else
			{
				wait(&wstatus);
				if (WIFEXITED(wstatus))
					write(1, "the child terminated normally\n", 30);
				if (WIFSIGNALED(wstatus))
					write(1, "the child was terminated by a signal\n", 37);
			}
			signal(SIGINT, handler_sigint); // restart signal handling for SIGINT because re-entring in interactive mode
		}
		else if (!line_input)
		{
			write(1, "exit\n", 5);
			exit(0);
		}
	}

	return (0);
}