/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2009  Georg Rudoy
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 **********************************************************************/

#include "urlcompletionmodel.h"
#include <stdexcept>
#include <QUrl>
#include <QtDebug>
#include <plugininterface/defaulthookproxy.h>
#include "core.h"
#include <boost/graph/graph_concepts.hpp>

namespace LeechCraft
{
	namespace Plugins
	{
		namespace Poshuku
		{
			URLCompletionModel::URLCompletionModel (QObject *parent)
			: QAbstractItemModel (parent)
			, Valid_ (false)
			{
			}

			URLCompletionModel::~URLCompletionModel ()
			{
			}

			int URLCompletionModel::columnCount (const QModelIndex&) const
			{
				return 1;
			}

			QVariant URLCompletionModel::data (const QModelIndex& index, int role) const
			{
				if (!index.isValid ())
					return QVariant ();

				if (role == Qt::DisplayRole)
					return Items_ [index.row ()].Title_ + " [" + Items_ [index.row ()].URL_ + "]";
				else if (role == Qt::DecorationRole)
					return Core::Instance ().GetIcon (QUrl (Items_ [index.row ()].URL_));
				else if (role == Qt::EditRole)
					return Base_ + index.row ();
				else if (role == RoleURL)
					return Items_ [index.row ()].URL_;
				else
					return QVariant ();
			}

			Qt::ItemFlags URLCompletionModel::flags (const QModelIndex&) const
			{
				return Qt::ItemIsEnabled | Qt::ItemIsSelectable;
			}

			QVariant URLCompletionModel::headerData (int, Qt::Orientation, int) const
			{
				return QVariant ();
			}

			QModelIndex URLCompletionModel::index (int row, int column,
					const QModelIndex& parent) const
			{
				if (!hasIndex (row, column, parent))
					return QModelIndex ();

				return createIndex (row, column);
			}

			QModelIndex URLCompletionModel::parent (const QModelIndex&) const
			{
				return QModelIndex ();
			}

			int URLCompletionModel::rowCount (const QModelIndex& index) const
			{
				if (index.isValid ())
					return 0;

				return Items_.size ();
			}

			void URLCompletionModel::addItem (const QString& title, const QString& url)
			{
				HistoryItem item =
				{
					title,
					QDateTime (),
					url
				};

				beginInsertRows (QModelIndex (), 0, 0);
				Items_.insert (Items_.begin (), item);
				endInsertRows ();
			}

			void URLCompletionModel::setBase (const QString& str)
			{
				Valid_ = false;
				Base_ = str;

				Populate ();

				Util::DefaultHookProxy_ptr proxy (new Util::DefaultHookProxy);
				int size = Items_.size ();
				emit hookURLCompletionNewStringRequested (proxy, this, str, size);
				if (proxy->IsCancelled ())
				{
					int newSize = Items_.size ();
					if (newSize == size)
						Items_.clear ();
					else
					{
						history_items_t newItems;
						std::copy (Items_.begin (), Items_.begin () + newSize - size,
								std::back_inserter (newItems));
						Items_ = newItems;
					}
				}

				emit baseUpdated (sender ());
			}

			void URLCompletionModel::handleItemAdded (const HistoryItem&)
			{
				Valid_ = false;
			}

			void URLCompletionModel::Populate ()
			{
				if (!Valid_)
				{
					Valid_ = true;

					int size = Items_.size () - 1;
					if (size > 0)
						beginRemoveRows (QModelIndex (), 0, size);
					Items_.clear ();
					if (size > 0)
						endRemoveRows ();

					if (Base_.startsWith ('!'))
					{
						QStringList cats = Core::Instance ()
								.GetProxy ()->GetSearchCategories ();
						cats.sort ();
						Q_FOREACH (const QString& cat, cats)
						{
							HistoryItem item =
							{
								cat,
								QDateTime (),
								"!" + cat
							};
							Items_.push_back (item);;
						}
					}
					else
					{
						try
						{
							Core::Instance ().GetStorageBackend ()->LoadResemblingHistory (Base_, Items_);
						}
						catch (const std::runtime_error& e)
						{
							qWarning () << Q_FUNC_INFO << e.what ();
							Valid_ = false;
						}
					}

					size = Items_.size () - 1;
					if (size >= 0)
					{
						beginInsertRows (QModelIndex (), 0, size);
						endInsertRows ();
					}
				}
			}
		};
	};
};

