// Copyright (c) 2009 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/gtk/bookmark_bar_gtk.h"

#include "base/gfx/gtk_util.h"
#include "chrome/browser/bookmarks/bookmark_context_menu.h"
#include "chrome/browser/bookmarks/bookmark_utils.h"
#include "chrome/browser/browser.h"
#include "chrome/browser/gtk/custom_button.h"
#include "chrome/browser/gtk/gtk_chrome_button.h"
#include "chrome/browser/metrics/user_metrics.h"
#include "chrome/browser/profile.h"
#include "chrome/common/gfx/text_elider.h"
#include "chrome/common/gtk_util.h"
#include "chrome/common/l10n_util.h"
#include "chrome/common/pref_names.h"
#include "chrome/common/pref_service.h"
#include "chrome/common/resource_bundle.h"
#include "grit/generated_resources.h"
#include "grit/theme_resources.h"

namespace {

const GdkColor kBackgroundColor = GDK_COLOR_RGB(0xe6, 0xed, 0xf4);

// Padding around the container.
const int kBarPadding = 2;

// Maximum number of characters on a bookmark button.
const size_t kMaxCharsOnAButton = 15;

// Our custom draging type for bookmarks.
static GtkTargetEntry target_table[] = {
  { const_cast<char*>("application/x-bookmark-toolbar-item"),
    GTK_TARGET_SAME_APP, 0 }
};

}  // namespace

BookmarkBarGtk::BookmarkBarGtk(Profile* profile, Browser* browser)
    : profile_(NULL),
      page_navigator_(NULL),
      browser_(browser),
      model_(NULL),
      instructions_(NULL),
      show_instructions_(true) {
  Init(profile);
  SetProfile(profile);
}

BookmarkBarGtk::~BookmarkBarGtk() {
  if (model_)
    model_->RemoveObserver(this);

  RemoveAllBookmarkButtons();
  bookmark_toolbar_.Destroy();
  container_.Destroy();
}

void BookmarkBarGtk::SetProfile(Profile* profile) {
  DCHECK(profile);
  if (profile_ == profile)
    return;

  RemoveAllBookmarkButtons();

  profile_ = profile;

  if (model_)
    model_->RemoveObserver(this);

  gtk_widget_set_sensitive(other_bookmarks_button_, false);

  // TODO(erg): Handle extensions

  model_ = profile_->GetBookmarkModel();
  model_->AddObserver(this);
  if (model_->IsLoaded())
    Loaded(model_);

  // else case: we'll receive notification back from the BookmarkModel when done
  // loading, then we'll populate the bar.
}

void BookmarkBarGtk::SetPageNavigator(PageNavigator* navigator) {
  page_navigator_ = navigator;
}

void BookmarkBarGtk::Init(Profile* profile) {
  // Load the default images from the resource bundle.
  ResourceBundle& rb = ResourceBundle::GetSharedInstance();
  static GdkPixbuf* folder_icon = rb.GetPixbufNamed(IDR_BOOKMARK_BAR_FOLDER);

  bookmark_hbox_ = gtk_hbox_new(FALSE, 0);
  container_.Own(gfx::CreateGtkBorderBin(bookmark_hbox_, &kBackgroundColor,
      kBarPadding, kBarPadding, kBarPadding, kBarPadding));

  instructions_ =
      gtk_label_new(
          l10n_util::GetStringUTF8(IDS_BOOKMARKS_NO_ITEMS).c_str());
  gtk_box_pack_start(GTK_BOX(bookmark_hbox_), instructions_,
                     FALSE, FALSE, 0);

  bookmark_toolbar_.Own(gtk_toolbar_new());
  g_signal_connect(G_OBJECT(bookmark_toolbar_.get()), "expose-event",
                   G_CALLBACK(&OnToolbarExpose), this);
  gtk_box_pack_start(GTK_BOX(bookmark_hbox_), bookmark_toolbar_.get(),
                     TRUE, TRUE, 0);

  gtk_drag_dest_set(bookmark_toolbar_.get(), GTK_DEST_DEFAULT_DROP,
                    target_table, G_N_ELEMENTS(target_table),
                    GDK_ACTION_MOVE);
  g_signal_connect(bookmark_toolbar_.get(), "drag-motion",
                   G_CALLBACK(&OnToolbarDragMotion), this);
  g_signal_connect(bookmark_toolbar_.get(), "drag-leave",
                   G_CALLBACK(&OnToolbarDragLeave), this);
  g_signal_connect(bookmark_toolbar_.get(), "drag-drop",
                   G_CALLBACK(&OnToolbarDragDrop), this);
  g_signal_connect(bookmark_toolbar_.get(), "button-press-event",
                   G_CALLBACK(&OnButtonPressed), this);

  gtk_box_pack_start(GTK_BOX(bookmark_hbox_), gtk_vseparator_new(),
                     FALSE, FALSE, 0);

  other_bookmarks_button_ = gtk_chrome_button_new();
  g_signal_connect(other_bookmarks_button_, "button-press-event",
                   G_CALLBACK(&OnButtonPressed), this);
  gtk_button_set_label(
      GTK_BUTTON(other_bookmarks_button_),
      l10n_util::GetStringUTF8(IDS_BOOMARK_BAR_OTHER_BOOKMARKED).c_str());
  gtk_button_set_image(GTK_BUTTON(other_bookmarks_button_),
                       gtk_image_new_from_pixbuf(folder_icon));

  gtk_box_pack_start(GTK_BOX(bookmark_hbox_), other_bookmarks_button_,
                     FALSE, FALSE, 0);
}

void BookmarkBarGtk::AddBookmarkbarToBox(GtkWidget* box) {
  gtk_box_pack_start(GTK_BOX(box), container_.get(), FALSE, FALSE, 0);
}

void BookmarkBarGtk::Show() {
  gtk_widget_show_all(container_.get());

  // Maybe show the instructions
  if (show_instructions_) {
    gtk_widget_show(instructions_);
  } else {
    gtk_widget_hide(instructions_);
  }
}

void BookmarkBarGtk::Hide() {
  gtk_widget_hide_all(container_.get());
}

bool BookmarkBarGtk::OnNewTabPage() {
  return (browser_ && browser_->GetSelectedTabContents() &&
          browser_->GetSelectedTabContents()->IsBookmarkBarAlwaysVisible());
}

void BookmarkBarGtk::Loaded(BookmarkModel* model) {
  RemoveAllBookmarkButtons();

  BookmarkNode* node = model_->GetBookmarkBarNode();
  DCHECK(node && model_->other_node());
  CreateAllBookmarkButtons(node);

  gtk_widget_set_sensitive(other_bookmarks_button_, true);
}

void BookmarkBarGtk::BookmarkModelBeingDeleted(BookmarkModel* model) {
  // The bookmark model should never be deleted before us. This code exists
  // to check for regressions in shutdown code and not crash.
  NOTREACHED();

  // Do minimal cleanup, presumably we'll be deleted shortly.
  model_->RemoveObserver(this);
  model_ = NULL;
}

void BookmarkBarGtk::BookmarkNodeMoved(BookmarkModel* model,
                                       BookmarkNode* old_parent,
                                       int old_index,
                                       BookmarkNode* new_parent,
                                       int new_index) {
  BookmarkNodeRemoved(model, old_parent, old_index);
  BookmarkNodeAdded(model, new_parent, new_index);
}

void BookmarkBarGtk::BookmarkNodeAdded(BookmarkModel* model,
                                       BookmarkNode* parent,
                                       int index) {
  if (parent != model_->GetBookmarkBarNode()) {
    // We only care about nodes on the bookmark bar.
    return;
  }
  DCHECK(index >= 0 && index <= GetBookmarkButtonCount());

  gtk_toolbar_insert(GTK_TOOLBAR(bookmark_toolbar_.get()),
                     CreateBookmarkToolItem(parent->GetChild(index)),
                     index);
}

void BookmarkBarGtk::BookmarkNodeRemoved(BookmarkModel* model,
                                         BookmarkNode* parent,
                                         int index) {
  if (parent != model_->GetBookmarkBarNode()) {
    // We only care about nodes on the bookmark bar.
    return;
  }
  DCHECK(index >= 0 && index < GetBookmarkButtonCount());

  GtkWidget* to_remove = GTK_WIDGET(gtk_toolbar_get_nth_item(
      GTK_TOOLBAR(bookmark_toolbar_.get()), index));
  gtk_container_remove(GTK_CONTAINER(bookmark_toolbar_.get()),
                       to_remove);
}

void BookmarkBarGtk::BookmarkNodeChanged(BookmarkModel* model,
                                         BookmarkNode* node) {
  if (node->GetParent() != model_->GetBookmarkBarNode()) {
    // We only care about nodes on the bookmark bar.
    return;
  }
  int index = model_->GetBookmarkBarNode()->IndexOfChild(node);
  DCHECK(index != -1);

  GtkToolItem* item = gtk_toolbar_get_nth_item(
      GTK_TOOLBAR(bookmark_toolbar_.get()), index);
  GtkWidget* button = gtk_bin_get_child(GTK_BIN(item));
  ConfigureButtonForNode(node, button);
}

void BookmarkBarGtk::BookmarkNodeFavIconLoaded(BookmarkModel* model,
                                               BookmarkNode* node) {
  BookmarkNodeChanged(model, node);
}

void BookmarkBarGtk::BookmarkNodeChildrenReordered(BookmarkModel* model,
                                                   BookmarkNode* node) {
  if (node != model_->GetBookmarkBarNode())
    return;  // We only care about reordering of the bookmark bar node.

  // Purge and rebuild the bar.
  RemoveAllBookmarkButtons();
  CreateAllBookmarkButtons(node);
}

void BookmarkBarGtk::CreateAllBookmarkButtons(BookmarkNode* node) {
  // Create a button for each of the children on the bookmark bar.
  for (int i = 0; i < node->GetChildCount(); ++i) {
    GtkToolItem* item = CreateBookmarkToolItem(node->GetChild(i));
    gtk_toolbar_insert(GTK_TOOLBAR(bookmark_toolbar_.get()), item, -1);
  }

  show_instructions_ = (node->GetChildCount() == 0);
  if (show_instructions_) {
    gtk_widget_show(instructions_);
  } else {
    gtk_widget_hide(instructions_);
  }
}

void BookmarkBarGtk::RemoveAllBookmarkButtons() {
  gfx::RemoveAllChildren(bookmark_toolbar_.get());
}

int BookmarkBarGtk::GetBookmarkButtonCount() {
  GList* children = gtk_container_get_children(
      GTK_CONTAINER(bookmark_toolbar_.get()));
  int count = g_list_length(children);
  g_list_free(children);
  return count;
}

bool BookmarkBarGtk::IsAlwaysShown() {
  return profile_->GetPrefs()->GetBoolean(prefs::kShowBookmarkBar);
}

void BookmarkBarGtk::ConfigureButtonForNode(BookmarkNode* node,
                                            GtkWidget* button) {
  gtk_widget_set_tooltip_text(button, BuildTooltip(node).c_str());

  // TODO(erg): Consider a soft maximum instead of this hard 15.
  std::wstring title = node->GetTitle();
  title = title.substr(0, std::min(title.size(), kMaxCharsOnAButton));
  gtk_button_set_label(GTK_BUTTON(button), WideToUTF8(title).c_str());

  if (node->is_url()) {
    if (node->GetFavIcon().width() != 0) {
      GdkPixbuf* pixbuf = gfx::GdkPixbufFromSkBitmap(&node->GetFavIcon());
      gtk_button_set_image(GTK_BUTTON(button),
                           gtk_image_new_from_pixbuf(pixbuf));
      g_object_unref(pixbuf);
    } else {
      ResourceBundle& rb = ResourceBundle::GetSharedInstance();
      static GdkPixbuf* default_bookmark_icon = rb.GetPixbufNamed(
          IDR_DEFAULT_FAVICON);
      gtk_button_set_image(GTK_BUTTON(button),
                           gtk_image_new_from_pixbuf(default_bookmark_icon));
    }
  } else {
      ResourceBundle& rb = ResourceBundle::GetSharedInstance();
      static GdkPixbuf* default_bookmark_icon = rb.GetPixbufNamed(
          IDR_BOOKMARK_BAR_FOLDER);
      gtk_button_set_image(GTK_BUTTON(button),
                           gtk_image_new_from_pixbuf(default_bookmark_icon));
  }
}

GtkWidget* BookmarkBarGtk::CreateBookmarkButton(
    BookmarkNode* node) {
  GtkWidget* button = gtk_chrome_button_new();
  ConfigureButtonForNode(node, button);

  // The tool item is also a source for dragging
  gtk_drag_source_set(button, GDK_BUTTON1_MASK,
                      target_table, G_N_ELEMENTS(target_table),
                      GDK_ACTION_MOVE);
  g_signal_connect(G_OBJECT(button), "drag-begin",
                   G_CALLBACK(&OnButtonDragBegin), this);
  g_signal_connect(G_OBJECT(button), "drag-end",
                   G_CALLBACK(&OnButtonDragEnd), this);


  if (node->is_url()) {
    // Connect to 'button-release-event' instead of 'clicked' because we need
    // access to the modifier keys and we do different things on each
    // button.
    g_signal_connect(G_OBJECT(button), "button-press-event",
                     G_CALLBACK(OnButtonPressed), this);
    g_signal_connect(G_OBJECT(button), "button-release-event",
                     G_CALLBACK(OnButtonReleased), this);
    GTK_WIDGET_UNSET_FLAGS(button, GTK_CAN_FOCUS);
  } else {
    // TODO(erg): This button can also be a drop target.

    // Connect to 'button-release-event' instead of 'clicked' because we need
    // access to the modifier keys and we do different things on each
    // button.
    g_signal_connect(G_OBJECT(button), "button-press-event",
                     G_CALLBACK(OnButtonPressed), this);
    g_signal_connect(G_OBJECT(button), "button-release-event",
                     G_CALLBACK(OnFolderButtonReleased), this);
    GTK_WIDGET_UNSET_FLAGS(button, GTK_CAN_FOCUS);
  }

  return button;
}

GtkToolItem* BookmarkBarGtk::CreateBookmarkToolItem(BookmarkNode* node) {
  GtkWidget* button = CreateBookmarkButton(node);

  GtkToolItem* item = gtk_tool_item_new();
  gtk_container_add(GTK_CONTAINER(item), button);
  gtk_widget_show_all(GTK_WIDGET(item));

  return item;
}

std::string BookmarkBarGtk::BuildTooltip(BookmarkNode* node) {
  // TODO(erg): Actually build the tooltip. For now, we punt and just return
  // the URL.
  return node->GetURL().possibly_invalid_spec();
}

BookmarkNode* BookmarkBarGtk::GetNodeForToolButton(GtkWidget* widget) {
  // First check to see if |button| is the special cased.
  if (widget == other_bookmarks_button_)
    return model_->other_node();
  else if (widget == bookmark_toolbar_.get())
    return model_->GetBookmarkBarNode();

  // Search the contents of |bookmark_toolbar_| for the corresponding widget
  // and find its index.
  GtkWidget* item_to_find = gtk_widget_get_parent(widget);
  int index_to_use = -1;
  int index = 0;
  GList* children = gtk_container_get_children(
      GTK_CONTAINER(bookmark_toolbar_.get()));
  for (GList* item = children; item; item = item->next, index++) {
    if (item->data == item_to_find) {
      index_to_use = index;
      break;
    }
  }
  g_list_free(children);

  if (index_to_use != -1)
    return model_->GetBookmarkBarNode()->GetChild(index_to_use);

  return NULL;
}

void BookmarkBarGtk::PopupMenuForNode(GtkWidget* sender, BookmarkNode* node,
                                      GdkEventButton* event) {
  if (!model_->IsLoaded()) {
    // Don't do anything if the model isn't loaded.
    return;
  }

  BookmarkNode* parent = NULL;
  std::vector<BookmarkNode*> nodes;
  if (sender == other_bookmarks_button_) {
    parent = model_->GetBookmarkBarNode();
    nodes.push_back(parent);
  } else if (sender != bookmark_toolbar_.get()) {
    nodes.push_back(node);
    parent = node->GetParent();
  } else {
    parent = model_->GetBookmarkBarNode();
    nodes.push_back(parent);
  }

  current_context_menu_.reset(new BookmarkContextMenu(
                                  GTK_WINDOW(gtk_widget_get_toplevel(sender)),
                                  profile_, browser_, page_navigator_,
                                  parent, nodes,
                                  BookmarkContextMenu::BOOKMARK_BAR));
  current_context_menu_->PopupAsContext(event->time);
}

// static
gboolean BookmarkBarGtk::OnButtonPressed(GtkWidget* sender,
                                         GdkEventButton* event,
                                         BookmarkBarGtk* bar) {
  if (sender != bar->other_bookmarks_button_ &&
      sender != bar->bookmark_toolbar_.get())
    bar->ignore_button_release_ = false;

  if (event->button == 3) {
    BookmarkNode* node = bar->GetNodeForToolButton(sender);
    DCHECK(node);
    DCHECK(bar->page_navigator_);
    bar->PopupMenuForNode(sender, node, event);
  }

  return FALSE;
}

// static
gboolean BookmarkBarGtk::OnButtonReleased(GtkWidget* sender,
                                          GdkEventButton* event,
                                          BookmarkBarGtk* bar) {
  if (bar->ignore_button_release_) {
    // Don't handle this message; it was a drag.
    bar->ignore_button_release_ = false;
    return FALSE;
  }

  BookmarkNode* node = bar->GetNodeForToolButton(sender);
  DCHECK(node);
  DCHECK(bar->page_navigator_);

  if (node->is_url()) {
    bar->page_navigator_->OpenURL(
        node->GetURL(), GURL(),
        event_utils::DispositionFromEventFlags(event->state),
        PageTransition::AUTO_BOOKMARK);
  } else {
    bookmark_utils::OpenAll(
        GTK_WINDOW(gtk_widget_get_toplevel(sender)), bar->profile_,
        bar->page_navigator_, node,
        event_utils::DispositionFromEventFlags(event->state));
  }

  UserMetrics::RecordAction(L"ClickedBookmarkBarURLButton", bar->profile_);

  // Allow other handlers to run so the button state is updated correctly.
  return FALSE;
}

// static
void BookmarkBarGtk::OnButtonDragBegin(GtkWidget* button,
                                       GdkDragContext* drag_context,
                                       BookmarkBarGtk* bar) {
  // Signal to any future OnButtonReleased calls that we're dragging instead of
  // pressing.
  bar->ignore_button_release_ = true;

  BookmarkNode* node = bar->GetNodeForToolButton(button);
  DCHECK(node);

  bar->dragged_node_ = node;
  bar->toolbar_drop_item_ = NULL;

  // Build a windowed representation for our button.
  GtkWidget* window = gtk_window_new(GTK_WINDOW_POPUP);
  gtk_widget_realize(window);

  GtkWidget* frame = gtk_frame_new(NULL);
  gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_OUT);
  gtk_container_add(GTK_CONTAINER(window), frame);
  gtk_widget_show(frame);

  GtkWidget* floating_button = bar->CreateBookmarkButton(node);
  gtk_container_add(GTK_CONTAINER(frame), floating_button);
  gtk_widget_show(floating_button);

  gint x, y;
  gtk_widget_get_pointer(button, &x, &y);
  gtk_drag_set_icon_widget(drag_context, window, x, y);

  // Hide our node
  gtk_widget_hide(button);
}

// static
void BookmarkBarGtk::OnButtonDragEnd(GtkWidget* button,
                                     GdkDragContext* drag_context,
                                     BookmarkBarGtk* bar) {
  // Cleanup everything from this drag
  if (bar->toolbar_drop_item_) {
    g_object_unref(bar->toolbar_drop_item_);
    bar->toolbar_drop_item_ = NULL;
  }

  bar->dragged_node_ = NULL;

  gtk_widget_show(button);
}

// static
gboolean BookmarkBarGtk::OnFolderButtonReleased(GtkWidget* sender,
                                                GdkEventButton* event,
                                                BookmarkBarGtk* bar) {
  if (bar->ignore_button_release_) {
    // Don't handle this message; it was a drag.
    bar->ignore_button_release_ = false;
    return FALSE;
  }

  BookmarkNode* node = bar->GetNodeForToolButton(sender);
  DCHECK(node);
  DCHECK(bar->page_navigator_);

  NOTIMPLEMENTED() << "Flesh this out once I can make folders.";

  // Allow other handlers to run so the button state is updated correctly.
  return FALSE;
}

// static
gboolean BookmarkBarGtk::OnToolbarExpose(GtkWidget* widget,
                                         GdkEventExpose* event,
                                         BookmarkBarGtk* bar) {
  // A GtkToolbar's expose handler first draws a box. We don't want that so we
  // need to propagate the expose event to all the container's children.
  GList* children = gtk_container_get_children(GTK_CONTAINER(widget));
  for (GList* item = children; item; item = item->next) {
    gtk_container_propagate_expose(GTK_CONTAINER(widget),
                                   GTK_WIDGET(item->data),
                                   event);
  }
  g_list_free(children);

  return TRUE;
}

// static
gboolean BookmarkBarGtk::OnToolbarDragMotion(GtkToolbar* toolbar,
                                             GdkDragContext* context,
                                             gint x,
                                             gint y,
                                             guint time,
                                             BookmarkBarGtk* bar) {
  if (!bar->toolbar_drop_item_) {
    bar->toolbar_drop_item_ = bar->CreateBookmarkToolItem(bar->dragged_node_);
    g_object_ref_sink(GTK_OBJECT(bar->toolbar_drop_item_));
  }

  gdk_drag_status(context, GDK_ACTION_MOVE, time);
  gint index = gtk_toolbar_get_drop_index(toolbar, x, y);
  gtk_toolbar_set_drop_highlight_item(toolbar,
                                      GTK_TOOL_ITEM(bar->toolbar_drop_item_),
                                      index);
  return TRUE;
}

// static
void BookmarkBarGtk::OnToolbarDragLeave(GtkToolbar* toolbar,
                                        GdkDragContext* context,
                                        guint time,
                                        BookmarkBarGtk* bar) {
  if (bar->toolbar_drop_item_) {
    g_object_unref(bar->toolbar_drop_item_);
    bar->toolbar_drop_item_ = NULL;
  }

  gtk_toolbar_set_drop_highlight_item(toolbar, NULL, 0);
}

// static
gboolean BookmarkBarGtk::OnToolbarDragDrop(GtkWidget* toolbar,
                                           GdkDragContext* drag_context,
                                           gint x,
                                           gint y,
                                           guint time,
                                           BookmarkBarGtk* bar) {
  // TODO(erg): This implementation only works within the same profile, which
  // is OK for now because we're restricted to drags from within the same
  // window.
  if (bar->dragged_node_) {
    gint index = gtk_toolbar_get_drop_index(GTK_TOOLBAR(toolbar), x, y);
    // Drag from same profile, do a move.
    bar->model_->Move(bar->dragged_node_, bar->model_->GetBookmarkBarNode(),
                      index);
    return TRUE;
  }

  return FALSE;
}