/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Mozilla platform.
 *
 * The Initial Developer of the Original Code is
 * the Mozilla Foundation <http://www.mozilla.org/>.
 *
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * Benjamin Smedberg <benjamin@smedbergs.us>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "crashreporter.h"

#include <dirent.h>
#include <sys/stat.h>
#include <errno.h>
#include <algorithm>

using namespace CrashReporter;
using std::string;
using std::vector;
using std::sort;

struct FileData
{
  time_t timestamp;
  string path;
};

static bool CompareFDTime(const FileData& fd1, const FileData& fd2)
{
  return fd1.timestamp > fd2.timestamp;
}

void UIPruneSavedDumps(const std::string& directory)
{
  DIR *dirfd = opendir(directory.c_str());
  if (!dirfd)
    return;

  vector<FileData> dumpfiles;

  while (dirent *dir = readdir(dirfd)) {
    FileData fd;
    fd.path = directory + '/' + dir->d_name;
    if (fd.path.size() < 5)
      continue;

    if (fd.path.compare(fd.path.size() - 4, 4, ".dmp") != 0)
      continue;

    struct stat st;
    if (stat(fd.path.c_str(), &st)) {
      closedir(dirfd);
      return;
    }

    fd.timestamp = st.st_mtime;

    dumpfiles.push_back(fd);
  }

  sort(dumpfiles.begin(), dumpfiles.end(), CompareFDTime);

  while (dumpfiles.size() > kSaveCount) {
    // get the path of the oldest file
    string path = dumpfiles[dumpfiles.size() - 1].path;
    UIDeleteFile(path.c_str());

    // s/.dmp/.extra/
    path.replace(path.size() - 4, 4, ".extra");
    UIDeleteFile(path.c_str());

    dumpfiles.pop_back();
  }
}