#include <unistd.h>

#include "buffer.h"
#include "env.h"
#include "exit.h"
#include "fmt.h"
#include "logmsg.h"
#include "seek.h"
#include "sig.h"
#include "wait.h"

#include "qmail.h"

#define WHO "condredirect"

struct qmail qqt;

static ssize_t mywrite(int fd, char *buf, int len)
{
  qmail_put(&qqt, buf, len);
  return len;
}

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

char num[FMT_ULONG];

int main(int argc, char **argv)
{
  char *sender;
  char *dtline;
  int pid;
  int wstat;
  char *qqx;

  if (!argv[1] || !argv[2]) logmsg(WHO, 100, USAGE, "condredirect newaddress program [ arg ... ]");

  pid = fork();
  if (pid == -1) logmsg(WHO, 111, FATAL, "unable to fork: ");
  if (pid == 0) {
    execvp(argv[2], argv + 2);
    if (errno) _exit(111);
    _exit(100);
  }
  if (wait_pid(&wstat, pid) == -1) logmsg(WHO, 111, FATAL, "wait failed");
  if (wait_crashed(wstat)) logmsg(WHO, 111, FATAL, "child crashed");
  switch (wait_exitcode(wstat)) {
    case 0:   break;
    case 111: logmsg(WHO, 111, FATAL, "temporary child error");
    default:  _exit(0);
  }

  if (seek_begin(0) == -1) logmsg(WHO, 111, FATAL, "unable to rewind: ");
  sig_pipeignore();

  sender = env_get("SENDER");
  if (!sender) logmsg(WHO, 100, ERROR, "SENDER not set");
  dtline = env_get("DTLINE");
  if (!dtline) logmsg(WHO, 100, ERROR, "DTLINE not set");

  if (qmail_open(&qqt) == -1) logmsg(WHO, 111, FATAL, "unable to fork: ");
  qmail_puts(&qqt, dtline);
  if (buffer_copy(&bo, &bi) != 0) logmsg(WHO, 111, FATAL, "unable to read message: ");
  buffer_flush(&bo);

  num[fmt_ulong(num, qmail_qp(&qqt))] = 0;

  qmail_from(&qqt, sender);
  qmail_to(&qqt, argv[1]);
  qqx = qmail_close(&qqt);
  if (*qqx) logmsg(WHO, *qqx == 'D' ? 100 : 111, FATAL, qqx + 1);
  logmsg(WHO, 0, LOG, B("qp ", num));
}