/* This file is part of Clementine.
   Copyright 2010, David Sansome <me@davidsansome.com>

   Clementine is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   Clementine is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "playlist.h"
#include "playlistmanager.h"
#include "playlisttabbar.h"
#include "playlistview.h"
#include "songmimedata.h"
#include "core/logging.h"
#include "internet/internetmimedata.h"
#include "ui/iconloader.h"
#include "widgets/renametablineedit.h"
#include "widgets/favoritewidget.h"

#include <QCheckBox>
#include <QContextMenuEvent>
#include <QDialogButtonBox>
#include <QGridLayout>
#include <QInputDialog>
#include <QMenu>
#include <QMessageBox>
#include <QPushButton>
#include <QToolTip>

const char* PlaylistTabBar::kSettingsGroup = "PlaylistTabBar";

PlaylistTabBar::PlaylistTabBar(QWidget *parent)
  : QTabBar(parent),
    manager_(NULL),
    menu_(new QMenu(this)),
    menu_index_(-1),
    suppress_current_changed_(false),
    rename_editor_(new RenameTabLineEdit(this))
{
  setAcceptDrops(true);
  setElideMode(Qt::ElideRight);
  setUsesScrollButtons(true);
  setTabsClosable(true);

  close_ = menu_->addAction(IconLoader::Load("list-remove"), tr("Close playlist"), this, SLOT(Close()));
  rename_ = menu_->addAction(IconLoader::Load("edit-rename"), tr("Rename playlist..."), this, SLOT(Rename()));
  save_ = menu_->addAction(IconLoader::Load("document-save"), tr("Save playlist..."), this, SLOT(Save()));
  menu_->addSeparator();

  rename_editor_->setVisible(false);
  connect(rename_editor_, SIGNAL(editingFinished()), SLOT(RenameInline()));
  connect(rename_editor_, SIGNAL(EditingCanceled()), SLOT(HideEditor()));

  connect(this, SIGNAL(currentChanged(int)), SLOT(CurrentIndexChanged(int)));
  connect(this, SIGNAL(tabMoved(int,int)), SLOT(TabMoved()));
  // We can't just emit Close signal, we need to extract the playlist id first
  connect(this, SIGNAL(tabCloseRequested(int)), SLOT(CloseFromTabIndex(int)));
}

void PlaylistTabBar::SetActions(
    QAction* new_playlist, QAction* load_playlist) {
  menu_->insertAction(0, new_playlist);
  menu_->insertAction(0, load_playlist);

  new_ = new_playlist;
}

void PlaylistTabBar::SetManager(PlaylistManager *manager) {
  manager_ = manager;
  connect(manager_, SIGNAL(PlaylistFavorited(int, bool)),
      SLOT(PlaylistFavoritedSlot(int, bool)));
}

void PlaylistTabBar::contextMenuEvent(QContextMenuEvent* e) {
  //we need to finish the renaming action before showing context menu
  if (rename_editor_->isVisible()) {
    //discard any change
    HideEditor();
  }

  menu_index_ = tabAt(e->pos());
  rename_->setEnabled(menu_index_ != -1);
  close_->setEnabled(menu_index_ != -1 && count() > 1);
  save_->setEnabled(menu_index_ != -1);

  menu_->popup(e->globalPos());
}

void PlaylistTabBar::mouseReleaseEvent(QMouseEvent* e) {
  if (e->button() == Qt::MidButton) {
    // Update menu index
    menu_index_ = tabAt(e->pos());
    Close();
  }

  QTabBar::mouseReleaseEvent(e);
}

void PlaylistTabBar::mouseDoubleClickEvent(QMouseEvent *e) {
  int index = tabAt(e->pos());

  //discard a double click with the middle button
  if (e->button() != Qt::MidButton) {
    if (index == -1) {
      new_->activate(QAction::Trigger);
    }
    else {
      //update current tab
      menu_index_ = index;

      //set position
      rename_editor_->setGeometry(tabRect(index));
      rename_editor_->setText(tabText(index));
      rename_editor_->setVisible(true);
      rename_editor_->setFocus();
    }
  }

  QTabBar::mouseDoubleClickEvent(e);
}

void PlaylistTabBar::Rename() {
  if (menu_index_ == -1)
    return;

  QString name = tabText(menu_index_);
  name = QInputDialog::getText(
      this, tr("Rename playlist"), tr("Enter a new name for this playlist"),
      QLineEdit::Normal, name);

  if (name.isNull())
    return;

  emit Rename(tabData(menu_index_).toInt(), name);
}

void PlaylistTabBar::RenameInline() {
  emit Rename(tabData(menu_index_).toInt(), rename_editor_->text());
  HideEditor();
}

void PlaylistTabBar::HideEditor() {
  //editingFinished() will be called twice due to Qt bug #40, so we reuse the same instance, don't delete it
  rename_editor_->setVisible(false);

  //hack to give back focus to playlist view
  manager_->SetCurrentPlaylist(manager_->current()->id());
}

void PlaylistTabBar::Close() {
  if (menu_index_ == -1)
    return;

  const int playlist_id = tabData(menu_index_).toInt();

  QSettings s;
  s.beginGroup(kSettingsGroup);

  const bool ask_for_delete = s.value("warn_close_playlist", true).toBool();

  if (ask_for_delete && !manager_->IsPlaylistFavorite(playlist_id) &&
      !manager_->playlist(playlist_id)->GetAllSongs().empty()) {
    QMessageBox confirmation_box;
    confirmation_box.setWindowIcon(QIcon(":/icon.png"));
    confirmation_box.setWindowTitle(tr("Remove playlist"));
    confirmation_box.setIcon(QMessageBox::Question);
    confirmation_box.setText(
        tr("You are about to remove a playlist which is not part of your favorite playlists: "
           "the playlist will be deleted (this action cannot be undone). \n"
           "Are you sure you want to continue?"));
    confirmation_box.setStandardButtons(QMessageBox::Yes | QMessageBox::Cancel);

    QCheckBox dont_prompt_again(tr("Warn me when closing a playlist tab"), &confirmation_box);
    dont_prompt_again.setChecked(ask_for_delete);
    dont_prompt_again.blockSignals(true);
    dont_prompt_again.setToolTip(
        tr("This option can be changed in the \"Behavior\" preferences"));

    QGridLayout* grid = qobject_cast<QGridLayout*>(confirmation_box.layout());
    QDialogButtonBox* buttons = confirmation_box.findChild<QDialogButtonBox*>();
    if (grid && buttons) {
        const int index = grid->indexOf(buttons);
        int row, column, row_span, column_span = 0;
        grid->getItemPosition(index, &row, &column, &row_span, &column_span);
        QLayoutItem* buttonsItem = grid->takeAt(index);
        grid->addWidget(&dont_prompt_again, row, column, row_span, column_span,
                        Qt::AlignLeft | Qt::AlignTop);
        grid->addItem(buttonsItem, ++row, column, row_span, column_span);
    } else {
      confirmation_box.addButton(&dont_prompt_again, QMessageBox::ActionRole);
    }

    if (confirmation_box.exec() != QMessageBox::Yes) {
      return;
    }

    // If user changed the pref, save the new one
    if (dont_prompt_again.isChecked() != ask_for_delete) {
      s.setValue("warn_close_playlist", dont_prompt_again.isChecked());
    }
  }

  // Close the playlist. If the playlist is not a favorite playlist, it will be
  // deleted, as it will not be visible after being closed. Otherwise, the tab
  // is closed but the playlist still exists and can be resurrected from the
  // "Playlists" tab.
  emit Close(playlist_id);

  // Select the nearest tab.
  if (menu_index_ > 1) {
    setCurrentIndex(menu_index_ - 1);
  }

  // Update playlist tab order/visibility
  TabMoved();
}

void PlaylistTabBar::CloseFromTabIndex(int index) {
  // Update the global index
  menu_index_ = index;
  Close();
}

void PlaylistTabBar::Save() {
  if (menu_index_ == -1)
    return;

  emit Save(tabData(menu_index_).toInt());
}

int PlaylistTabBar::current_id() const {
  if (currentIndex() == -1)
    return -1;
  return tabData(currentIndex()).toInt();
}


int PlaylistTabBar::index_of(int id) const {
  for (int i=0 ; i<count() ; ++i) {
    if (tabData(i).toInt() == id) {
      return i;
    }
  }
  return -1;
}

void PlaylistTabBar::set_current_id(int id) {
  setCurrentIndex(index_of(id));
}

int PlaylistTabBar::id_of(int index) const {
  if (index < 0 || index >= count()) {
    qLog(Warning) << "Playlist tab index requested is out of bounds!";
    return 0;
  }
  return tabData(index).toInt();
}

void PlaylistTabBar::set_icon_by_id(int id, const QIcon &icon) {
  setTabIcon(index_of(id), icon);
}

void PlaylistTabBar::RemoveTab(int id) {
  removeTab(index_of(id));
}

void PlaylistTabBar::set_text_by_id(int id, const QString &text) {
  setTabText(index_of(id), text);
  setTabToolTip(index_of(id), text);
}

void PlaylistTabBar::CurrentIndexChanged(int index) {
  if (!suppress_current_changed_)
    emit CurrentIdChanged(tabData(index).toInt());
}

void PlaylistTabBar::InsertTab(int id, int index, const QString& text, bool favorite) {
  suppress_current_changed_ = true;
  insertTab(index, text);
  setTabData(index, id);
  setTabToolTip(index, text);
  FavoriteWidget* widget = new FavoriteWidget(id, favorite);
  widget->setToolTip(tr(
      "Click here to favorite this playlist so it will be saved and remain accessible "
      "through the \"Playlists\" panel on the left side bar"));
  connect(widget, SIGNAL(FavoriteStateChanged(int, bool)),
                  SIGNAL(PlaylistFavorited(int, bool)));
  setTabButton(index, QTabBar::LeftSide, widget);
  suppress_current_changed_ = false;

  if (currentIndex() == index)
    emit CurrentIdChanged(id);

  // Update playlist tab order/visibility
  TabMoved();
}

void PlaylistTabBar::TabMoved() {
  QList<int> ids;
  for (int i=0 ; i<count() ; ++i) {
    ids << tabData(i).toInt();
  }
  emit PlaylistOrderChanged(ids);
}

void PlaylistTabBar::dragEnterEvent(QDragEnterEvent* e) {
  if (e->mimeData()->hasUrls() ||
      e->mimeData()->hasFormat(Playlist::kRowsMimetype) ||
      qobject_cast<const MimeData*>(e->mimeData())) {
    e->acceptProposedAction();
  }
}

void PlaylistTabBar::dragMoveEvent(QDragMoveEvent* e) {
  drag_hover_tab_ = tabAt(e->pos());

  if (drag_hover_tab_ != -1) {
    e->setDropAction(Qt::CopyAction);
    e->accept(tabRect(drag_hover_tab_));

    if (!drag_hover_timer_.isActive())
      drag_hover_timer_.start(kDragHoverTimeout, this);
  } else {
    drag_hover_timer_.stop();
  }
}

void PlaylistTabBar::dragLeaveEvent(QDragLeaveEvent*) {
  drag_hover_timer_.stop();
}

void PlaylistTabBar::timerEvent(QTimerEvent* e) {
  QTabBar::timerEvent(e);

  if (e->timerId() == drag_hover_timer_.timerId()) {
    drag_hover_timer_.stop();
    if (drag_hover_tab_ != -1)
      setCurrentIndex(drag_hover_tab_);
  }
}

void PlaylistTabBar::dropEvent(QDropEvent* e) {
  if (drag_hover_tab_ == -1) {
    const MimeData *mime_data = qobject_cast<const MimeData*>(e->mimeData());
    if(mime_data && !mime_data->name_for_new_playlist_.isEmpty()) {
      manager_->New(mime_data->name_for_new_playlist_);
    } else {
      manager_->New(tr("Playlist"));
    }
    setCurrentIndex(count() - 1);
  } else {
    setCurrentIndex(drag_hover_tab_);
  }

  manager_->current()->dropMimeData(e->mimeData(), e->proposedAction(), -1, 0, QModelIndex());
}

bool PlaylistTabBar::event(QEvent* e) {
  switch (e->type()) {
    case QEvent::ToolTip: {
      QHelpEvent *he = static_cast<QHelpEvent*>(e);

      QRect displayed_tab;
      QSize real_tab;
      bool is_elided = false;

      real_tab = tabSizeHint(tabAt(he->pos()));
      displayed_tab = tabRect(tabAt(he->pos()));
      // Check whether the tab is elided or not
      is_elided = displayed_tab.width() < real_tab.width();
      if(!is_elided) {
        // If it's not elided, don't show the tooltip
        QToolTip::hideText();
      } else {
        QToolTip::showText(he->globalPos(), tabToolTip(tabAt(he->pos())));
      }
      return true;
    }
    default:
      return QTabBar::event(e);
  }
}

void PlaylistTabBar::PlaylistFavoritedSlot(int id, bool favorite) {
  const int index = index_of(id);
  FavoriteWidget* favorite_widget = qobject_cast<FavoriteWidget*>(tabButton(index, QTabBar::LeftSide));
  if (favorite_widget) {
    favorite_widget->SetFavorite(favorite);
  }
}