/**
 *  @file maildir-writecache.cc
 *  @brief  Implementation of the Maildir class.
 *  @author Andreas Aardal Hanssen
 *  @date 2002-2005
 */

#include "globals.h"
#include "maildir.h"

#include <dirent.h>
#include <fcntl.h>
#include <unistd.h>

bool Binc::Maildir::writeCache()
{
  if (readOnly) return true;

  char *safename = strdup((path + "/.bincimap-cache-tmp-XXXXXX").c_str());
  int fd = mkstemp(safename);
  if (!fd) {
    free(safename);
    return false;
  }

  std::string safeName = safename;
  free(safename);

  FILE *fp = fdopen(fd, "w");
  if (!fp) {
    unlink(safeName.c_str());
    return false;
  }

  if (uidvalidity == 0 || uidnext == 0) {
    uidvalidity = time(nullptr);
    uidnext = messages.size() + 1;
  }

  fprintf(fp, "%s %u %u\n", BINC_CACHE, uidvalidity, uidnext);
  Mailbox::iterator i = begin(SequenceSet::all(), INCLUDE_EXPUNGED);
  for (; i != end(); ++i) {
    MaildirMessage &message = (MaildirMessage &)*i;
    fprintf(fp,
            "%u %u %u %s",
            message.getUID(),
            (unsigned int)message.getInternalDate(),
            message.getSize(),
            message.getUnique().c_str());
    std::vector<std::string> cflags = message.getCustomFlags();
    for (const auto &it : cflags)
      fprintf(fp, " %s", it.c_str());
    fprintf(fp, "\n");
  }

  if (fflush(fp) || (fsync(fd) && (errno != EROFS || errno != EINVAL)) || fclose(fp)) {
    unlink(safeName.c_str());
    return false;
  }

  if (rename(safeName.c_str(), (path + "/bincimap-cache").c_str()) != 0) {
    unlink(safeName.c_str());
    return false;
  }

  int dfd = open(path.c_str(), O_RDONLY);
  if (dfd == -1 || (fsync(fd) && (errno != EROFS || errno != EINVAL)) || close(dfd))
    return false;

  return true;
}