// Copyright (c) 2011 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.

#include "chrome/browser/tab_contents/web_drag_bookmark_handler_gtk.h"

#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_window.h"
#include "chrome/browser/ui/gtk/bookmarks/bookmark_utils_gtk.h"
#include "chrome/browser/ui/bookmarks/bookmark_tab_helper.h"
#include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
#include "chrome/browser/profiles/profile.h"
#include "ui/base/dragdrop/gtk_dnd_util.h"

WebDragBookmarkHandlerGtk::WebDragBookmarkHandlerGtk()
    : tab_(NULL) {
}

WebDragBookmarkHandlerGtk::~WebDragBookmarkHandlerGtk() {}

void WebDragBookmarkHandlerGtk::DragInitialize(TabContents* contents) {
  bookmark_drag_data_.Clear();

  // Ideally we would want to initialize the the TabContentsWrapper member in
  // the constructor. We cannot do that as the WebDragDestGtk object is
  // created during the construction of the TabContents object.  The
  // TabContentsWrapper is created much later.
  DCHECK(tab_ ? (tab_->tab_contents() == contents) : true);
  if (!tab_)
    tab_ = TabContentsWrapper::GetCurrentWrapperForContents(contents);
}

GdkAtom WebDragBookmarkHandlerGtk::GetBookmarkTargetAtom() const {
  // For GTK, bookmark drag data is encoded as pickle and associated with
  // ui::CHROME_BOOKMARK_ITEM. See bookmark_utils::WriteBookmarksToSelection()
  // for details.
  return ui::GetAtomForTarget(ui::CHROME_BOOKMARK_ITEM);
}

void WebDragBookmarkHandlerGtk::OnReceiveDataFromGtk(GtkSelectionData* data) {
  if (tab_) {
    Profile* profile = tab_->profile();
    bookmark_drag_data_.ReadFromVector(
        bookmark_utils::GetNodesFromSelection(
            NULL, data,
            ui::CHROME_BOOKMARK_ITEM,
            profile, NULL, NULL));
    bookmark_drag_data_.SetOriginatingProfile(profile);
  }
}

void WebDragBookmarkHandlerGtk::OnReceiveProcessedData(const GURL& url,
                                                       const string16& title) {
  bookmark_drag_data_.ReadFromTuple(url, title);
}

void WebDragBookmarkHandlerGtk::OnDragOver() {
  if (tab_ && tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()) {
    tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()->OnDragOver(
        bookmark_drag_data_);
  }
}

void WebDragBookmarkHandlerGtk::OnDragEnter() {
  // This is non-null if tab_contents_ is showing an ExtensionWebUI with
  // support for (at the moment experimental) drag and drop extensions.
  if (tab_ && tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()) {
    tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()->OnDragEnter(
        bookmark_drag_data_);
  }
}

void WebDragBookmarkHandlerGtk::OnDrop() {
  // This is non-null if tab_contents_ is showing an ExtensionWebUI with
  // support for (at the moment experimental) drag and drop extensions.
  if (tab_) {
    if (tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()) {
      tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()->OnDrop(
          bookmark_drag_data_);
    }

    // Focus the target browser.
    Browser* browser = Browser::GetBrowserForController(
        &tab_->controller(), NULL);
    if (browser)
      browser->window()->Show();
  }
}

void WebDragBookmarkHandlerGtk::OnDragLeave() {
  if (tab_ && tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()) {
    tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()->OnDragLeave(
        bookmark_drag_data_);
  }
}