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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the $MODULE$ of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial Usage
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef HISTORY_H
+#define HISTORY_H
+
+#include "modelmenu.h"
+
+#include <QtCore/QDateTime>
+#include <QtCore/QHash>
+#include <QtCore/QObject>
+#include <QtCore/QTimer>
+#include <QtCore/QUrl>
+
+#include <QtGui/QSortFilterProxyModel>
+
+#include <QWebHistoryInterface>
+
+class HistoryItem
+{
+public:
+    HistoryItem() {}
+    HistoryItem(const QString &u,
+                const QDateTime &d = QDateTime(), const QString &t = QString())
+        : title(t), url(u), dateTime(d) {}
+
+    inline bool operator==(const HistoryItem &other) const
+        { return other.title == title
+          && other.url == url && other.dateTime == dateTime; }
+
+    // history is sorted in reverse
+    inline bool operator <(const HistoryItem &other) const
+        { return dateTime > other.dateTime; }
+
+    QString title;
+    QString url;
+    QDateTime dateTime;
+};
+
+class AutoSaver;
+class HistoryModel;
+class HistoryFilterModel;
+class HistoryTreeModel;
+class HistoryManager : public QWebHistoryInterface
+{
+    Q_OBJECT
+    Q_PROPERTY(int historyLimit READ historyLimit WRITE setHistoryLimit)
+
+signals:
+    void historyReset();
+    void entryAdded(const HistoryItem &item);
+    void entryRemoved(const HistoryItem &item);
+    void entryUpdated(int offset);
+
+public:
+    HistoryManager(QObject *parent = 0);
+    ~HistoryManager();
+
+    bool historyContains(const QString &url) const;
+    void addHistoryEntry(const QString &url);
+
+    void updateHistoryItem(const QUrl &url, const QString &title);
+
+    int historyLimit() const;
+    void setHistoryLimit(int limit);
+
+    QList<HistoryItem> history() const;
+    void setHistory(const QList<HistoryItem> &history, bool loadedAndSorted = false);
+
+    // History manager keeps around these models for use by the completer and other classes
+    HistoryModel *historyModel() const;
+    HistoryFilterModel *historyFilterModel() const;
+    HistoryTreeModel *historyTreeModel() const;
+
+public slots:
+    void clear();
+    void loadSettings();
+
+private slots:
+    void save();
+    void checkForExpired();
+
+protected:
+    void addHistoryItem(const HistoryItem &item);
+
+private:
+    void load();
+
+    AutoSaver *m_saveTimer;
+    int m_historyLimit;
+    QTimer m_expiredTimer;
+    QList<HistoryItem> m_history;
+    QString m_lastSavedUrl;
+
+    HistoryModel *m_historyModel;
+    HistoryFilterModel *m_historyFilterModel;
+    HistoryTreeModel *m_historyTreeModel;
+};
+
+class HistoryModel : public QAbstractTableModel
+{
+    Q_OBJECT
+
+public slots:
+    void historyReset();
+    void entryAdded();
+    void entryUpdated(int offset);
+
+public:
+    enum Roles {
+        DateRole = Qt::UserRole + 1,
+        DateTimeRole = Qt::UserRole + 2,
+        UrlRole = Qt::UserRole + 3,
+        UrlStringRole = Qt::UserRole + 4
+    };
+
+    HistoryModel(HistoryManager *history, QObject *parent = 0);
+    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const;
+    bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());
+
+private:
+    HistoryManager *m_history;
+};
+
+/*!
+    Proxy model that will remove any duplicate entries.
+    Both m_sourceRow and m_historyHash store their offsets not from
+    the front of the list, but as offsets from the back.
+  */
+class HistoryFilterModel : public QAbstractProxyModel
+{
+    Q_OBJECT
+
+public:
+    HistoryFilterModel(QAbstractItemModel *sourceModel, QObject *parent = 0);
+
+    inline bool historyContains(const QString &url) const
+        { load(); return m_historyHash.contains(url); }
+    int historyLocation(const QString &url) const;
+
+    QModelIndex mapFromSource(const QModelIndex &sourceIndex) const;
+    QModelIndex mapToSource(const QModelIndex &proxyIndex) const;
+    void setSourceModel(QAbstractItemModel *sourceModel);
+    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const;
+    QModelIndex index(int, int, const QModelIndex& = QModelIndex()) const;
+    QModelIndex parent(const QModelIndex& index= QModelIndex()) const;
+    bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
+
+private slots:
+    void sourceReset();
+    void sourceDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight);
+    void sourceRowsInserted(const QModelIndex &parent, int start, int end);
+    void sourceRowsRemoved(const QModelIndex &, int, int);
+
+private:
+    void load() const;
+
+    mutable QList<int> m_sourceRow;
+    mutable QHash<QString, int> m_historyHash;
+    mutable bool m_loaded;
+};
+
+/*
+    The history menu
+    - Removes the first twenty entries and puts them as children of the top level.
+    - If there are less then twenty entries then the first folder is also removed.
+
+    The mapping is done by knowing that HistoryTreeModel is over a table
+    We store that row offset in our index's private data.
+*/
+class HistoryMenuModel : public QAbstractProxyModel
+{
+    Q_OBJECT
+
+public:
+    HistoryMenuModel(HistoryTreeModel *sourceModel, QObject *parent = 0);
+    int columnCount(const QModelIndex &parent) const;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const;
+    QModelIndex mapFromSource(const QModelIndex & sourceIndex) const;
+    QModelIndex mapToSource(const QModelIndex & proxyIndex) const;
+    QModelIndex index(int, int, const QModelIndex &parent = QModelIndex()) const;
+    QModelIndex parent(const QModelIndex &index = QModelIndex()) const;
+
+    int bumpedRows() const;
+
+private:
+    HistoryTreeModel *m_treeModel;
+};
+
+// Menu that is dynamically populated from the history
+class HistoryMenu : public ModelMenu
+{
+    Q_OBJECT
+
+signals:
+    void openUrl(const QUrl &url);
+
+public:
+     HistoryMenu(QWidget *parent = 0);
+     void setInitialActions(QList<QAction*> actions);
+
+protected:
+    bool prePopulated();
+    void postPopulated();
+
+private slots:
+    void activated(const QModelIndex &index);
+    void showHistoryDialog();
+
+private:
+    HistoryManager *m_history;
+    HistoryMenuModel *m_historyMenuModel;
+    QList<QAction*> m_initialActions;
+};
+
+// proxy model for the history model that
+// exposes each url http://www.foo.com and it url starting at the host www.foo.com
+class HistoryCompletionModel : public QAbstractProxyModel
+{
+    Q_OBJECT
+
+public:
+    HistoryCompletionModel(QObject *parent = 0);
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const;
+    QModelIndex mapFromSource(const QModelIndex &sourceIndex) const;
+    QModelIndex mapToSource(const QModelIndex &proxyIndex) const;
+    QModelIndex index(int, int, const QModelIndex& = QModelIndex()) const;
+    QModelIndex parent(const QModelIndex& index= QModelIndex()) const;
+    void setSourceModel(QAbstractItemModel *sourceModel);
+
+private slots:
+    void sourceReset();
+
+};
+
+// proxy model for the history model that converts the list
+// into a tree, one top level node per day.
+// Used in the HistoryDialog.
+class HistoryTreeModel : public QAbstractProxyModel
+{
+    Q_OBJECT
+
+public:
+    HistoryTreeModel(QAbstractItemModel *sourceModel, QObject *parent = 0);
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
+    int columnCount(const QModelIndex &parent) const;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const;
+    QModelIndex mapFromSource(const QModelIndex &sourceIndex) const;
+    QModelIndex mapToSource(const QModelIndex &proxyIndex) const;
+    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;
+    QModelIndex parent(const QModelIndex &index= QModelIndex()) const;
+    bool hasChildren(const QModelIndex &parent = QModelIndex()) const;
+    Qt::ItemFlags flags(const QModelIndex &index) const;
+    bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());
+    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
+
+    void setSourceModel(QAbstractItemModel *sourceModel);
+
+private slots:
+    void sourceReset();
+    void sourceRowsInserted(const QModelIndex &parent, int start, int end);
+    void sourceRowsRemoved(const QModelIndex &parent, int start, int end);
+
+private:
+    int sourceDateRow(int row) const;
+    mutable QList<int> m_sourceRowCache;
+
+};
+
+// A modified QSortFilterProxyModel that always accepts the root nodes in the tree
+// so filtering is only done on the children.
+// Used in the HistoryDialog
+class TreeProxyModel : public QSortFilterProxyModel
+{
+    Q_OBJECT
+
+public:
+    TreeProxyModel(QObject *parent = 0);
+
+protected:
+    bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const;
+};
+
+#include "ui_history.h"
+
+class HistoryDialog : public QDialog, public Ui_HistoryDialog
+{
+    Q_OBJECT
+
+signals:
+    void openUrl(const QUrl &url);
+
+public:
+    HistoryDialog(QWidget *parent = 0, HistoryManager *history = 0);
+
+private slots:
+    void customContextMenuRequested(const QPoint &pos);
+    void open();
+    void copy();
+
+};
+
+#endif // HISTORY_H
+