/*
    This file is part of libkresources

    Copyright (c) 2001 Cornelius Schumacher <schumacher@kde.org>
    Copyright (c) 2002 Jan-Pascal van Best <janpascal@vanbest.org>

    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., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.
*/

#ifndef KRESOURCES_RESOURCE_H
#define KRESOURCES_RESOURCE_H

//US
#ifdef QT_THREAD_SUPPORT
#include <qmutex.h>
#endif //QT_THREAD_SUPPORT

#include <q3valuelist.h>
#include <qwidget.h>

#include <qobject.h>

#include <klibloader.h>

class KConfig;

namespace KRES {

class ConfigWidget;

/**
 * @internal
 * @libdoc The KDE Resource library
 *
 * NOTE: this library is NOT (YET?) PUBLIC. Do not publish this
 * interface, it is in constant flux.
 *
 * The KDE Resource framework can be used to manage resources of
 * different types, organized in families. The Resource framework
 * is currently used for addressbook resources in libkabc and for
 * calendar resources in libkcal.
 *
 * When you want to use the framework for a new family, you need to
 * <ul><li>Define a name for your resource family</li>
 * <li>subclass Resource and add the fields and method that are needed
 * in your application</li>
 * <li>If needed, override the doOpen() and doClose() methods.
 * <li> Provide a configuration possibility for resources in your
 * new family. You can use @ref ResourcesConfigPage to easily create a
 * KControl applet</li>
 * <li>In your application, you can use @ref ResourceManager to keep track
 * of the resources in your family, and you can use @ref ResourceSelectDialog
 * to let the user select a single resource.</li>
 * </ul>
 *
 * When you want to add a new resource type to an existing resource family,
 * you need to
 * <ul><li>Further subclass the family-specific Resource to implement
 * resource type-specific operation</li>
 * <li>Subclass ResourceConfigWidget to provide a configuration widget
 * for your new resource type</li>
 * <li>Provide a .desktop file so that the new resource type can be found
 * automatically by the ResourceManager</li>
 * </ul>
 *
 * Example:
 *
<B>resourceexample.h</B>:
<pre>
#include <kconfig.h>
#include <kresources/resource.h>

class ResourceExample : public KRES::ResourceExample
{
public:
  ResourceExample( const KConfig * );
  ~ResourceCalendarExchange();
  void writeConfig( KConfig *config );
private:
  QString mLocation;
  QString mPassword;
}
</pre>
<B>resourceexample.cpp</B>:
<pre>
#include <kconfig.h>

#include "resourceexample.h"

ResourceExample::ResourceExample( const KConfig *config )
    : Resource( config )
{
  if ( config ) {
    mLocation = config->readEntry( "Location" );
    mPassword = KStringHandler::obscure( config->readEntry( "Password" ) );
  } else {
    mLocation = ""; // Or some sensible default
    mPassword = "";
  }
}

void ResourceExample::writeConfig( KConfig *config )
{
  KRES::Resource::writeConfig( config );
  config->writeEntry( "Location", mLocation );
  config->writeEntry( "Password", KStringHandler::obscure( mPassword ) );
}

extern "C"
{
  KRES::ResourceExample *config_widget( QWidget *parent ) {
    return new ResourceExampleConfig( parent, "Configure Example Resource" );
  }

  KRES::Resource *resource( const KConfig *config ) {
    return new ResourceExample( config );
  }
}
</pre>
* <B>resourceexampleconfig.h</B>:
<pre>
#include <klineedit.h>
#include <kresources/resourceconfigwidget.h>

#include "resourceexample.h"

class ResourceExampleConfig : public KRES::ResourceConfigWidget
{
  Q_OBJECT

public:
  ResourceExampleConfig( QWidget* parent = 0, const char* name = 0 );

public slots:
  virtual void loadSettings( KRES::Resource *resource);
  virtual void saveSettings( KRES::Resource *resource );

private:
  KLineEdit* mLocationEdit;
  KLineEdit* mPasswordEdit;
};
</pre>
* <B>resourceexampleconfig.cpp</B>:
<pre>
#include <qlayout.h>
#include <qlabel.h"
#include <kresources/resourceconfigwidget.h>
#include "resourceexample.h"
#include "resourceexampleconfig.h"

ResourceExampleConfig::ResourceExampleConfig( QWidget* parent,  const char* name )
    : KRES::ResourceConfigWidget( parent, name )
{
  resize( 245, 115 );
  QGridLayout *mainLayout = new QGridLayout( this, 2, 2 );

  QLabel *label = new QLabel( i18n( "Location:" ), this );
  mHostEdit = new KLineEdit( this );
  mainLayout->addWidget( label, 1, 0 );
  mainLayout->addWidget( mHostEdit, 1, 1 );

  label = new QLabel( i18n( "Password:" ), this );
  mPasswordEdit = new KLineEdit( this );
  mPasswordEdit->setEchoMode( QLineEdit::Password );
  mainLayout->addWidget( label, 2, 0 );
  mainLayout->addWidget( mPasswordEdit, 2, 1 );
}

void ResourceExampleConfig::loadSettings( KRES::Resource *resource )
{
  ResourceExample* res = dynamic_cast<ResourceExample *>( resource );
  if (res) {
    mHostEdit->setText( res->host() );
    mPasswordEdit->setText( res->password() );
  } else
    kdDebug(5700) << "ERROR: ResourceExampleConfig::loadSettings(): no ResourceExample, cast failed" << endl;
}

void ResourceExampleConfig::saveSettings( KRES::Resource *resource )
{
  ResourceExample* res = dynamic_cast<ResourceExample *>( resource );
  if (res) {
    res->setHost(mHostEdit->text());
    res->setPassword(mPasswordEdit->text());
  } else
    kdDebug(5700) << "ERROR: ResourceExampleConfig::saveSettings(): no ResourceExample, cast failed" << endl;
}
</pre>
* <B>resourceexample.desktop</B>:
<pre>
[Desktop Entry]
Type=Service

[Misc]
Encoding=UTF-8
Name=Example Resource

[Plugin]
Type=exchange
X-KDE-Library=resourceexample
</pre>
* <B>Makefile.am</B>
<pre>
kde_module_LTLIBRARIES = resourceexample.la

resourceexample_la_SOURCES = resourceexample.cpp resourceexampleconfig.cpp
resourceexample_la_LDFLAGS= $(all_libraries) -module $(KDE_PLUGIN)
resourceexample_la_LIBADD= -lkderesources

linkdir= $(kde_datadir)/resources/family
link_DATA= resourceexample.desktop
</pre>
 *
 *
 */

/**
 * A @ref Resource  is a ...
 *
 * A subclass should reimplement at least the constructor and the
k * @ref writeConfig method.
 *
   */
class Resource : public QObject
{
  Q_OBJECT

  public:
    typedef Q3ValueList<Resource *> List;

    /**
     * Constructor. Construct resource from config.
     * @param config Configuration to read persistence information from.
     *               If config==0, create object using default settings.
     */
    Resource( const KConfig* config );

    /**
     * Destructor.
     */
    virtual ~Resource();

    /**
     * Write configuration information for this resource to a configuration
     * file. If you override this method, remember to call Resource::writeConfig
     * or Terrible Things(TM) will happen.
     * @param config Configuration to write persistence information to.
     */
    virtual void writeConfig( KConfig* config );

    /**
     * Open this resource, if it not already open. Increase the open
     * count of this object, and open the resource by calling @ref doOpen().
     * This method may block while another thread is concurrently opening
     * or closing the resource.
     *
     * Returns true if the resource was already opened or if it was opened
     * successfully; returns false if the resource was not opened successfully.
     */
    bool open();

    /**
     * Decrease the open count of this object, and if the count reaches
     * zero, close this resource by calling @ref doClose().
     * This method may block while another thread is concurrently closing
     * or opening the resource.
     */
    void close();

    /**
     * Returns whether the resource is open or not.
     */
    bool isOpen() const;

    /**
     * Returns a unique identifier. The identifier is unique for this resource.
     * It is created when the resource is first created, and it is retained
     * in the resource family configuration file for this resource.
     * @return This resource's identifier
     */
    QString identifier() const;

    /**
     * Returns the type of this resource.
     */
    QString type() const;

    /**
     * Mark the resource as read-only. You can override this method,
     * but also remember to call Resource::setReadOnly().
     */
    virtual void setReadOnly( bool value );

    /**
     * Returns, if the resource is read-only.
     */
    virtual bool readOnly() const;

    void setIncludeInSync( bool value );
    bool includeInSync() const;
    /**
     * Set the name of resource.You can override this method,
     * but also remember to call Resource::setResourceName().
     */
    virtual void setResourceName( const QString &name );

    /**
     * Returns the name of resource.
     */
    virtual QString resourceName() const;

    /**
      Sets, if the resource is active.
    */
    void setActive( bool active );

    /**
      Return true, if the resource is active.
    */
    bool isActive() const;

    friend class Factory;
    friend class ManagerImpl;

    /**
      Print resource information as debug output.
    */
    virtual void dump() const;


  protected:
    /**
     * Open this resource. When called, the resource must be in
     * a closed state.
     *
     * Returns true if the resource was opened successfully;
     * returns false if the resource was not opened successfully.
     *
     * The result of this call can be accessed later by @ref isOpen()
     */
    virtual bool doOpen() { return true; }

    /**
     * Close this resource. Pre-condition: resource is open.
     * Post-condition: resource is closed.
     */
    virtual void doClose() {}

    void setIdentifier( const QString& identifier );
    void setType( const QString& type );

  private:
    class ResourcePrivate;
    ResourcePrivate *d;
};

class PluginFactoryBase : public KLibFactory
{
  public:
    virtual Resource *resource( const KConfig *config) = 0;

    virtual ConfigWidget *configWidget( QWidget *parent ) = 0;

  protected:
    virtual QObject* createObject( QObject*, const char*, const char*,
                                   const QStringList & )
    {
      return 0;
    }
};

template<class TR,class TC>
class PluginFactory : public PluginFactoryBase
{
  public:
    Resource *resource( const KConfig *config)
    {
      return new TR( config );
    }

    ConfigWidget *configWidget( QWidget *parent )
    {
      return new TC( parent );
    }
};



}

#endif