#include <unistd.h>

#include "buffer.h"
#include "env.h"
#include "exit.h"
#include "fd.h"
#include "getoptb.h"
#include "logmsg.h"
#include "sig.h"
#include "wait.h"

#define WHO "preline"

void die_usage()
{
  logmsg(WHO, 100, USAGE, "preline cmd [ arg ... ]");
}

int flagufline = 1;
char *ufline;
int flagrpline = 1;
char *rpline;
int flagdtline = 1;
char *dtline;

char outbuf[BUFFER_OUTSIZE];
buffer bo = BUFFER_INIT(write, 1, outbuf, sizeof(outbuf));
char inbuf[BUFFER_INSIZE];
buffer bi = BUFFER_INIT(read, 0, inbuf, sizeof(inbuf));

int main(int argc, char **argv)
{
  int opt;
  int pi[2];
  int pid;
  int wstat;

  sig_pipeignore();

  if (!(ufline = env_get("UFLINE"))) die_usage();
  if (!(rpline = env_get("RPLINE"))) die_usage();
  if (!(dtline = env_get("DTLINE"))) die_usage();

  while ((opt = getopt(argc, argv, "frdFRD")) != opteof) {
    switch (opt) {
      case 'f': flagufline = 0; break;
      case 'r': flagrpline = 0; break;
      case 'd': flagdtline = 0; break;
      case 'F': flagufline = 1; break;
      case 'R': flagrpline = 1; break;
      case 'D': flagdtline = 1; break;
      default:  die_usage();
    }
  }
  argc -= optind;
  argv += optind;
  if (!*argv) die_usage();

  if (pipe(pi) == -1) logmsg(WHO, 111, FATAL, "unable to create pipe");

  pid = fork();
  if (pid == -1) logmsg(WHO, 111, FATAL, "unable to fork");

  if (pid == 0) {
    close(pi[1]);
    if (fd_move(0, pi[0]) == -1) logmsg(WHO, 111, FATAL, "unable to set up fds");
    sig_pipedefault();
    execvp(*argv, argv);
    logmsg(WHO, errno, FATAL, B("unable to run: ", *argv));
  }
  close(pi[0]);
  if (fd_move(1, pi[1]) == -1) logmsg(WHO, 111, FATAL, "unable to set up fds");

  if (flagufline) buffer_puts(&bo, ufline);
  if (flagrpline) buffer_puts(&bo, rpline);
  if (flagdtline) buffer_puts(&bo, dtline);
  if (buffer_copy(&bo, &bi) != 0) logmsg(WHO, 111, FATAL, "unable to copy input");
  buffer_flush(&bo);
  close(1);

  if (wait_pid(&wstat, pid) == -1) logmsg(WHO, 111, FATAL, "wait failed");
  if (wait_crashed(wstat)) logmsg(WHO, 111, FATAL, "child crashed");
  _exit(wait_exitcode(wstat));
}