// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// This file declares util functions for setup project.

#include "chrome/installer/setup/setup_util.h"

#include "base/file_util.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "chrome/installer/util/util_constants.h"
#include "courgette/courgette.h"
#include "third_party/bspatch/mbspatch.h"

int installer::ApplyDiffPatch(const FilePath& src,
                               const FilePath& patch,
                               const FilePath& dest) {
  VLOG(1) << "Applying patch " << patch.value() << " to file " << src.value()
          << " and generating file " << dest.value();

  // Try Courgette first.  Courgette checks the patch file first and fails
  // quickly if the patch file does not have a valid Courgette header.
  courgette::Status patch_status =
      courgette::ApplyEnsemblePatch(src.value().c_str(),
                                    patch.value().c_str(),
                                    dest.value().c_str());
  if (patch_status == courgette::C_OK)
    return 0;

  VLOG(1) << "Failed to apply patch " << patch.value() << " using courgette.";
  return ApplyBinaryPatch(src.value().c_str(), patch.value().c_str(),
                          dest.value().c_str());
}

Version* installer::GetMaxVersionFromArchiveDir(const FilePath& chrome_path) {
  VLOG(1) << "Looking for Chrome version folder under " << chrome_path.value();
  Version* version = NULL;
  file_util::FileEnumerator version_enum(chrome_path, false,
      file_util::FileEnumerator::DIRECTORIES);
  // TODO(tommi): The version directory really should match the version of
  // setup.exe.  To begin with, we should at least DCHECK that that's true.

  scoped_ptr<Version> max_version(Version::GetVersionFromString("0.0.0.0"));
  bool version_found = false;

  while (!version_enum.Next().empty()) {
    file_util::FileEnumerator::FindInfo find_data = {0};
    version_enum.GetFindInfo(&find_data);
    VLOG(1) << "directory found: " << find_data.cFileName;

    scoped_ptr<Version> found_version(
        Version::GetVersionFromString(WideToASCII(find_data.cFileName)));
    if (found_version.get() != NULL &&
        found_version->CompareTo(*max_version.get()) > 0) {
      max_version.reset(found_version.release());
      version_found = true;
    }
  }

  return (version_found ? max_version.release() : NULL);
}