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 // This license reflects the original Adept code:
 // -*- C++ -*- (c) 2008 Petr Rockai <me@mornfall.net>
 //             (c) 2011 Modestas Vainius <modax@debian.org>
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
 //
 //     * Neither the name of [original copyright holder] nor the names of
 //       its contributors may be used to endorse or promote products
 //       derived from this software without specific prior written
 //       permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 /*
  * All the modifications below are licensed under this license
  * Copyright (C) 2010 Daniel Nicoletti <dantti12@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library 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
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB. If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef DEBCONF_H
 #define DEBCONF_H
 
 #include <QtCore/QHash>
 #include <QtCore/QStringList>
 #include <QtCore/QMetaEnum>
 #include <QtCore/QMetaObject>
 #include <QtCore/QFile>
 #include <QtNetwork/QLocalSocket>
 #include <QtNetwork/QLocalServer>
 
 class QSocketNotifier;
 
 namespace DebconfKde {
 
 /**
   * An abstract class which talks Debconf Passthrough frontend protocol. It
   * does not implement underlying I/O method specifics.
   */
 class DebconfFrontend : public QObject {
     Q_OBJECT
     Q_ENUMS(PropertyKey)
     Q_ENUMS(TypeKey)
 public:
     typedef enum {
         Choices,
         Description,
         ExtendedDescription,
         Type,
         UnknownPropertyKey = -1
     } PropertyKey;
 
     typedef enum {
         String,
         Password,
         Progress,
         Boolean,
         Select,
         Multiselect,
         Note,
         Error,
         Title,
         Text,
         UnknownTypeKey = -1
     } TypeKey;
 
     explicit DebconfFrontend(QObject *parent = 0);
     virtual ~DebconfFrontend();
 
     QString value(const QString &key) const;
     void setValue(const QString &key, const QString &value);
 
     QString property(const QString &key, PropertyKey p) const;
 
     TypeKey type(const QString &string) const;
 
     /**
       * Send \p string to Debconf over established connection
       */
     void say(const QString &string);
 
     /**
      * Goes to the next question
      */
     void next();
     /**
      * Goes back one question (if backup(true) was emitted)
      */
     void back();
     /**
      * Closes the current connection, canceling all questions
      */
     virtual void cancel();
 
 Q_SIGNALS:
     void go(const QString &title, const QStringList &input);
     void progress(const QString &param);
     /**
       * Emitted when connection with Debconf is terminated.
       */
     void finished();
     void backup(bool capable);
 
 protected Q_SLOTS:
     /**
      * This slot should be called when there is new data available.
      */
     virtual bool process();
 
     /**
      * This slot should be called when connection with Debconf is terminated.
      */
     virtual void disconnected();
 
 protected:
     /**
       * This method must be overridden by the derivative class and return
       * current QIODevice which should be used to read data from Debconf.
       */
     virtual QIODevice* getReadDevice() const = 0;
     /**
       * This method must be overridden by the derivative class and return
       * current QIODevice which should be used to write data to Debconf.
       */
     virtual QIODevice* getWriteDevice() const = 0;
     /**
      * This is called to clean up internal data once connection with
      * Debconf is terminated.
      */
     virtual void reset();
 
 private:
     void cmd_capb(const QString &caps);
     void cmd_set(const QString &param);
     void cmd_get(const QString &param);
     void cmd_input(const QString &param);
     void cmd_go(const QString &);
     void cmd_title(const QString &param);
     void cmd_data(const QString &param);
     void cmd_subst(const QString &param);
     void cmd_progress(const QString &param);
     void cmd_x_ping(const QString &param);
     void cmd_version(const QString &param);
     void cmd_x_loadtemplatefile(const QString &param);
     void cmd_info(const QString &param);
     void cmd_fget(const QString &param);
     void cmd_fset(const QString &param);
     void cmd_beginblock(const QString &param);
     void cmd_endblock(const QString &param);
     void cmd_stop(const QString &param);
     struct Cmd {
         const char *cmd;
         void (DebconfFrontend::*run)(const QString &);
     };
     static const Cmd commands[];
 
     // TODO this is apparently very much untested
     QString substitute(const QString &key, const QString &rest) const;
     /**
      * Transforms the string camel cased and return it's enum given the enum name
      */
     template<class T> static int enumFromString(const QString &str, const char *enumName);
     PropertyKey propertyKeyFromString(const QString &string);
 
     typedef QHash<PropertyKey, QString> Properties;
     typedef QHash<QString, QString> Substitutions;
     typedef QHash<QString, bool> Flags;
 
     QHash<QString, Properties>    m_data;
     QHash<QString, Substitutions> m_subst;
     QHash<QString, QString>       m_values;
     QHash<QString, Flags>         m_flags;
     QString m_title;
     QStringList m_input;
 };
 
 /**
   * DebconfFrontend which communicates with Debconf over UNIX socket. Even when
   * finished signal is emitted, DeconfFrontend will reset and continue to
   * listen for new connections on the socket.
   */
 class DebconfFrontendSocket : public DebconfFrontend {
     Q_OBJECT
 
 public:
     /**
       * Instantiates the class and starts listening for new connections on the
       * socket at \p socketName path. Please note that any file at \p socketName
       * will be removed if it exists prior to the call of this constructor.
       */
     explicit DebconfFrontendSocket(const QString &socketName, QObject *parent = 0);
 
     /**
       * Removes socket when the object is destroyed.
       */
     virtual ~DebconfFrontendSocket();
 
     /**
       * Overridden to trigger termination of the current connection.
       */
     void cancel() override;
 
 protected:
     inline QIODevice* getReadDevice() const override { return m_socket; }
     inline QIODevice* getWriteDevice() const override { return m_socket; }
     void reset() override;
 
 private Q_SLOTS:
     /**
      * Called when a new connection is received on the socket
      * If we are already handlyng a connection we refuse the others
      */
     void newConnection();
 
 private:
     QLocalServer *m_server;
     QLocalSocket *m_socket;
 };
 
 /**
   * DebconfFrontend which communicates with Debconf over FIFO pipes. Once
   * finished signal is emitted, the frontend is no longer usable as pipes
   * have been been closed by then.
   */
 class DebconfFrontendFifo : public DebconfFrontend {
 
 public:
     /**
       * Instantiates the class and prepares for communication with Debconf over
       * \p readfd (read) and \p writefd (write) FIFO file descriptors.
       */
     explicit DebconfFrontendFifo(int readfd, int writefd, QObject *parent = 0);
 
     /**
       * Overridden to trigger full disconnection
       */
     void cancel() override;
 
 protected:
     QIODevice* getReadDevice() const override { return m_readf; }
     QIODevice* getWriteDevice() const override { return m_writef; }
     void reset() override;
     bool process() override;
 
 private:
     QFile *m_readf;
     QFile *m_writef;
     QSocketNotifier *m_readnotifier;
 };
 
 }
 
 #endif