// Copyright (c) 2012 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 implements common select dialog functionality between GTK and KDE.

#ifndef CHROME_BROWSER_UI_LIBGTKUI_SELECT_FILE_DIALOG_IMPL_H_
#define CHROME_BROWSER_UI_LIBGTKUI_SELECT_FILE_DIALOG_IMPL_H_

#include <stddef.h>

#include <memory>
#include <set>

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/nix/xdg_util.h"
#include "ui/aura/window.h"
#include "ui/shell_dialogs/select_file_dialog.h"
#include "ui/shell_dialogs/select_file_policy.h"

namespace libgtkui {

// Shared implementation SelectFileDialog used by SelectFileDialogImplGTK
class SelectFileDialogImpl : public ui::SelectFileDialog {
 public:
  // Main factory method which returns correct type.
  static ui::SelectFileDialog* Create(
      Listener* listener,
      std::unique_ptr<ui::SelectFilePolicy> policy);

  // Factory method for creating a GTK-styled SelectFileDialogImpl
  static SelectFileDialogImpl* NewSelectFileDialogImplGTK(
      Listener* listener,
      std::unique_ptr<ui::SelectFilePolicy> policy);
  // Factory method for creating a KDE-styled SelectFileDialogImpl
  static SelectFileDialogImpl* NewSelectFileDialogImplKDE(
      Listener* listener,
      std::unique_ptr<ui::SelectFilePolicy> policy,
      base::nix::DesktopEnvironment desktop);

  // Returns true if the SelectFileDialog class returned by
  // NewSelectFileDialogImplKDE will actually work.
  static bool CheckKDEDialogWorksOnUIThread();

  // BaseShellDialog implementation.
  void ListenerDestroyed() override;

 protected:
  explicit SelectFileDialogImpl(Listener* listener,
                                std::unique_ptr<ui::SelectFilePolicy> policy);
  ~SelectFileDialogImpl() override;

  // SelectFileDialog implementation.
  // |params| is user data we pass back via the Listener interface.
  void SelectFileImpl(Type type,
                      const base::string16& title,
                      const base::FilePath& default_path,
                      const FileTypeInfo* file_types,
                      int file_type_index,
                      const base::FilePath::StringType& default_extension,
                      gfx::NativeWindow owning_window,
                      void* params) override = 0;

  // Wrapper for base::DirectoryExists() that allow access on the UI
  // thread. Use this only in the file dialog functions, where it's ok
  // because the file dialog has to do many stats anyway. One more won't
  // hurt too badly and it's likely already cached.
  bool CallDirectoryExistsOnUIThread(const base::FilePath& path);

  // The file filters.
  FileTypeInfo file_types_;

  // The index of the default selected file filter.
  // Note: This starts from 1, not 0.
  size_t file_type_index_;

  // The type of dialog we are showing the user.
  Type type_;

  // These two variables track where the user last saved a file or opened a
  // file so that we can display future dialogs with the same starting path.
  static base::FilePath* last_saved_path_;
  static base::FilePath* last_opened_path_;

  DISALLOW_COPY_AND_ASSIGN(SelectFileDialogImpl);
};

}  // namespace libgtkui

#endif  // CHROME_BROWSER_UI_LIBGTKUI_SELECT_FILE_DIALOG_IMPL_H_