/*****************************************************************************
 * Copyright (C) 2003 Csaba Karai <krusader@users.sourceforge.net>           *
 * Copyright (C) 2004-2018 Krusader Krew [https://krusader.org]              *
 *                                                                           *
 * This file is part of Krusader [https://krusader.org].                     *
 *                                                                           *
 * Krusader 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 2 of the License, or         *
 * (at your option) any later version.                                       *
 *                                                                           *
 * Krusader 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 Krusader.  If not, see [http://www.gnu.org/licenses/].         *
 *****************************************************************************/

#ifndef KONFIGURATORPAGE_H
#define KONFIGURATORPAGE_H

// QtWidgets
#include <QGridLayout>
#include <QGroupBox>
#include <QLabel>
#include <QLayout>
#include <QScrollArea>

#include "konfiguratoritems.h"

struct KONFIGURATOR_CHECKBOX_PARAM;

/**
  * KonfiguratorPage is responsible for handling pages in Konfigurator.
  * It provides simple methods for create and manage Konfigurator pages.
  *
  * @short The base class of a page in Konfigurator
  */
class KonfiguratorPage : public QScrollArea
{
    Q_OBJECT

public:
    /**
      * The constructor of the KonfiguratorPage class.
      *
      * @param firstTime    this parameter is true if it is the first call of Konfigurator
      * @param parent       reference to the parent widget
      */
    KonfiguratorPage(bool firstTime, QWidget *parent);

    /**
      * Applies the changes in the Konfigurator page.
      *
      * Writes out all relevant information to the konfiguration object and synchronizes
      * it with the file storage (hard disk, krusaderrc file). This function calls the apply()
      * method of each konfigurator item and finally performs the synchronization.
      *
      * @return a boolean value indicates that Krusader restart is needed for the correct change
      */
    virtual bool apply();

    /**
      * Sets every konfigurator item to its default value on the page.
      *
      * This method calls the setDefaults() method of each konfigurator item. This function
      * doesn't modify the current configuration, only the values of the GUI items. The
      * apply() method must be called for finalizing the changes.
      */
    virtual void setDefaults();

    /**
      * Reloads the original value of each konfigurator item from the configuration object.
      *
      * This function calls the loadInitialValue() method of each konfigurator item.
      * Used to rollback the changes on the konfigurator page. Called if the user
      * responds 'No' to the "Apply changes" question.
      */
    virtual void loadInitialValues();

    /**
      * Checks whether the page was changed.
      *
      * This function calls the isChanged() method of each konfigurator item and
      * performs logical OR operation on them. Actually, this function returns true
      * if any of the konfigurator items was changed.
      *
      * @return             true if at least one of the konfigurator items was changed
      */
    virtual bool isChanged();

    /**
      * Flag, indicates the first call of Konfigurator
      * @return             true if konfigurator was started at the first time
      */
    inline bool isFirst() { return firstCall; }

    /**
      * This method is used to query the active subpage from the Konfigurator
      * @return             the active page (by default the first page)
      */
    virtual int activeSubPage() { return FIRST_PAGE; }

    /**
      * Adds a new checkbox item to the page.
      * <br>The checkbox widget's name is QString(configGroup + "/" + name).ascii()<br>
      *
      * Sample:<br><br>
      * KonfiguratorCheckBox *myCheckBox = createCheckBox( "class", "name", false, parentWidget);<br>
      * myLayout->addWidget( myCheckBox, 0, 0 );
      *
      * @param  configGroup     The class name used in KConfig (ex. "Archives")
      * @param  name            The item name used in KConfig (ex. "Do Tar")
      * @param  defaultValue    The default value of the checkbox
      * @param  text            The text field of the checkbox
      * @param  parent          Reference to the parent widget
      * @param  restart         The change of this parameter requires Krusader restart
      * @param  toolTip         Tooltip used for this checkbox
      * @param  page            The subpage of a Konfigurator page (because of setDefaults)
      *
      * @return             reference to the newly created checkbox
      */
    KonfiguratorCheckBox *createCheckBox(QString configGroup, QString name, bool defaultValue,
                                         QString text, QWidget *parent = 0, bool restart = false,
                                         QString toolTip = QString(), int page = FIRST_PAGE);

    /**
      * Adds a new spinbox item to the page.
      * <br>The spinbox widget's name is QString(configGroup + "/" + name).ascii()<br>
      *
      * Sample:<br><br>
      * KonfiguratorSpinBox *mySpinBox = createSpinBox( "class", "name", 10, 1, 100, parentWidget);<br>
      * myLayout->addWidget( mySpinBox, 0, 0 );
      *
      * @param  configGroup     The class name used in KConfig (ex. "Archives")
      * @param  name            The item name used in KConfig (ex. "Do Tar")
      * @param  defaultValue    The default value of the spinbox
      * @param  min             The minimum value of the spinbox
      * @param  max             The maximum value of the spinbox
      * @param  parent          Reference to the parent widget
      * @param  restart         The change of this parameter requires Krusader restart
      * @param  page            The subpage of a Konfigurator page (because of setDefaults)
      *
      * @return             reference to the newly created spinbox
      */
    KonfiguratorSpinBox *createSpinBox(QString configGroup, QString configName, int defaultValue,
                                       int min, int max, QWidget *parent = 0, bool restart = false,
                                       int page = FIRST_PAGE);

    /**
      * Adds a new editbox item to the page.
      * <br>The editbox widget's name is QString(configGroup + "/" + name).ascii()<br>
      *
      * Sample:<br><br>
      * KonfiguratorEditBox *myEditBox = createEditBox( "class", "name", "default", parentWidget);<br>
      * myLayout->addWidget( myEditBox, 0, 0 );
      *
      * @param  configGroup     The class name used in KConfig (ex. "Archives")
      * @param  name            The itemname used in KConfig (ex. "Do Tar")
      * @param  defaultValue    The default value of the editbox
      * @param  parent          Reference to the parent widget
      * @param  restart         The change of this parameter requires Krusader restart
      * @param  page            The subpage of a Konfigurator page (because of setDefaults)
      *
      * @return             reference to the newly created editbox
      */
    KonfiguratorEditBox *createEditBox(QString configGroup, QString name, QString defaultValue,
                                       QWidget *parent = 0, bool restart = false,
                                       int page = FIRST_PAGE);

    /**
      * Adds a new listbox item to the page.
      * <br>The listbox widget's name is QString(configGroup + "/" + name).ascii()<br>
      *
      * Sample:<br><br>
      * QStringList valueList;<br>
      * valueList += "item";<br>
      * KonfiguratorListBox *myListBox = createListBox( "class", "name", valueList, parentWidget);<br>
      * myLayout->addWidget( myListBox, 0, 0 );
      *
      * @param  configGroup     The class name used in KConfig (ex. "Archives")
      * @param  name            The itemname used in KConfig (ex. "Do Tar")
      * @param  defaultValue    The default value of the listbox
      * @param  parent          Reference to the parent widget
      * @param  restart         The change of this parameter requires Krusader restart
      * @param  page            The subpage of a Konfigurator page (because of setDefaults)
      *
      * @return             reference to the newly created editbox
      */
    KonfiguratorListBox *createListBox(QString configGroup, QString name, QStringList defaultValue,
                                       QWidget *parent = 0, bool restart = false,
                                       int page = FIRST_PAGE);

    /**
      * Adds a new URL requester item to the page.
      * <br>The URL requester widget's name is QString(configGroup + "/" + name).ascii()<br>
      *
      * Sample:<br><br>
      * KonfiguratorURLRequester *myURLRequester = createURLRequester( "class", "name", "default", parentWidget );<br>
      * myLayout->addWidget( myURLRequester, 0, 0 );
      *
      * @param  configGroup     The class name used in KConfig (ex. "Archives")
      * @param  name            The itemname used in KConfig (ex. "Do Tar")
      * @param  defaultValue    The default value of the URL requester
      * @param  text            The text field of the URL requester
      * @param  parent          Reference to the parent widget
      * @param  restart         The change of this parameter requires Krusader restart
      * @param  page            The subpage of a Konfigurator page (because of setDefaults)
      * @param  expansion       Whether to perform url espansion
      *
      * @return             reference to the newly created URL requester
      */
    KonfiguratorURLRequester *createURLRequester(QString configGroup, QString name,
                                                 QString defaultValue, QWidget *parent,
                                                 bool restart, int page = FIRST_PAGE,
                                                 bool expansion = true);

    /**
      * Adds a new font chooser item to the page.
      * <br>The font chooser widget's name is QString(configGroup + "/" + name).ascii()<br>
      *
      * Sample:<br><br>
      * KonfiguratorFontChooser *myFontChooser = createFontChooser( "class", "name", QFont(), parentWidget );<br>
      * myLayout->addWidget( myFontChooser, 0, 0 );
      *
      * @param  configGroup     The class name used in KConfig (ex. "Archives")
      * @param  name            The item name used in KConfig (ex. "Do Tar")
      * @param  defaultValue    The default value of the font chooser
      * @param  parent          Reference to the parent widget
      * @param  restart         The change of this parameter requires Krusader restart
      * @param  page            The subpage of a Konfigurator page (because of setDefaults)
      *
      * @return             reference to the newly created font chooser
      */
    KonfiguratorFontChooser *createFontChooser(QString configGroup, QString name,
                                               QFont defaultValue, QWidget *parent = 0,
                                               bool restart = false, int page = FIRST_PAGE);

    /**
      * Adds a new combobox item to the page.
      * <br>The combobox widget's name is QString(configGroup + "/" + name).ascii()<br>
      *
      * Sample:<br><br>
      * KONFIGURATOR_NAME_VALUE_PAIR comboInfo[] =<br>
      * &nbsp;{{ i18n( "combo text1" ), "value1" },<br>
      * &nbsp;&nbsp;{ i18n( "combo text2" ), "value2" },<br>
      * &nbsp;&nbsp;{ i18n( "combo text3" ), "value3" }};<br><br>
      * KonfiguratorComboBox *myComboBox = createComboBox( "class", "name", "value2", comboInfo, 3, parentWidget );<br>
      * myLayout->addWidget( myComboBox, 0, 0 );
      *
      * @param  configGroup     The class name used in KConfig (ex. "Archives")
      * @param  name            The item name used in KConfig (ex. "Do Tar")
      * @param  defaultValue    The default value of the combobox
      * @param  params          Pointer to the name-value pair array (combo elements)
      * @param  paramNum        Number of the combobox elements
      * @param  text            The text field of the combobox
      * @param  parent          Reference to the parent widget
      * @param  restart         The change of this parameter requires Krusader restart
      * @param  editable        Flag indicates that the combo can be edited
      * @param  page            The subpage of a Konfigurator page (because of setDefaults)
      *
      * @return             reference to the newly created combobox
      */
    KonfiguratorComboBox *createComboBox(QString configGroup, QString name, QString defaultValue,
                                         KONFIGURATOR_NAME_VALUE_PAIR *params, int paramNum,
                                         QWidget *parent = 0, bool restart = false,
                                         bool editable = false, int page = FIRST_PAGE);

    /**
      * Creates a frame on the page.
      *
      * Sample:<br><br>
      * QGroupBox *myGroup = createFrame( i18n( "MyFrameName" ), parentWidget, "frameName" );<br>
      * myLayout->addWidget( myGroup, 0, 0 );
      *
      * @param  text        The text written out onto the frame
      * @param  parent      Reference to the parent widget
      *
      * @return             reference to the newly created frame
      */
    QGroupBox *createFrame(QString text = QString(), QWidget *parent = 0);

    /**
      * Creates a new QGridLayout element and sets its margins.
      *
      * Sample:<br><br>
      * QGroupBox *myGroup = createFrame( i18n( "MyFrameName" ), parentWidget, "frameName" );<br>
      * QGridLayout *myLayout = createGridLayout( myGroup ) );<br>
      * myLayout->addWidget( myGroup, 0, 0 );
      *
      * @param  parent      Reference to the parent layout
      *
      * @return             reference to the newly created QGridLayout
      */
    QGridLayout *createGridLayout(QWidget *parent);

    /**
      * Adds a new label to a grid layout.
      *
      * Sample:<br><br>
      * QGroupBox *myGroup = createFrame( i18n( "MyFrameName" ), parentWidget, "frameName" );<br>
      * QGridLayout *myLayout = createGridLayout( myGroup->layout() );<br>
      * addLabel( myLayout, 0, 0, i18n( "Hello world!" ), myGroup, "myLabel" );<br>
      * mainLayout->addWidget( myGroup, 0, 0 );
      *
      * @param  layout      The grid layout on which the item will be placed
      * @param  x           the column to which the label will be placed
      * @param  y           the row to which the label will be placed
      * @param  label       the text of the label
      * @param  parent      Reference to the parent widget
      *
      * @return             reference to the newly created label
      */
    QLabel *addLabel(QGridLayout *layout, int x, int y, QString label, QWidget *parent = 0);

    /**
      * Creates a spacer object (for justifying in QHBox).
      *
      * Sample:<br><br>
      * QHBox *hbox = new QHBox( myParent, "hbox" );<br>
      * createSpinBox( "class", "spin", 5, 1, 10, hbox );<br>
      * createSpacer( hbox );<br>
      * myLayout->addWidget( hbox, 0, 0 );
      *
      * @param  parent      Reference to the parent widget
      *
      * @return             reference to the newly created spacer widget
      */
    QWidget *createSpacer(QWidget *parent = 0);

    /**
      * Creates a separator line.
      *
      * Sample:<br><br>
      * QFrame *myLine = createLine( myParent, "myLine" );<br>
      * myLayout->addWidget( myLine, 1, 0 );<br>
      *
      * @param  parent      Reference to the parent widget
      * @param  vertical    Means vertical line
      *
      * @return             reference to the newly created spacer widget
      */
    QFrame *createLine(QWidget *parent = 0, bool vertical = false);

    /**
      * Creates a checkbox group. A checkbox group contains a lot of checkboxes.
      * The grouped checkboxes are embedded into one widget, which can be placed anywhere
      * on the GUI. The placing of the elements can be horizontal or vertical in the group.
      * At horizontal placing the sizex integer defines the maximum element number in
      * one row, sizey is 0. At vertical placing sizex is 0, and sizey defines the
      * maximum row number in one column. <br>
      *
      * One specific element can be reached by its name or index with the find methods.
      * The first element is checkBoxGroup->find( 0 ), "myCb" element is checkBoxGroup->find( "myCb") ...
      *
      * Sample:<br><br>
      * KONFIGURATOR_CHECKBOX_PARAM myCBArray[] =<br>
      * &nbsp;{{"CbClass","CbName1", false, i18n( "name1" ), false, "tooltip1"},<br>
      * &nbsp;&nbsp;{"CbClass","CbName2", true, i18n( "name2" ), false, "tooltip2"},<br>
      * &nbsp;&nbsp;{"CbClass","CbName3", true, i18n( "name3" ), false, "tooltip3"}};<br><br>
      * KonfiguratorCheckBoxGroup *myCheckBoxGroup = createCheckBoxGroup( 1, 0, myCBArray, 3, myParent, "myCheckboxGroup" );<br>
      * myCheckBoxGroup->find( 0 )->setEnabled( false );<br><br>
      * myLayout->addWidget( myCheckBoxGroup, 0, 0 );<br>
      *
      * @param  sizex       the maximum column number at horizontal placing
      * @param  sizey       the maximum row number at vertical placing
      * @param  params      pointer to the checkbox array
      * @param  paramNum    number of the checkbox elements
      * @param  parent      Reference to the parent widget
      * @param  page        The subpage of a Konfigurator page (because of setDefaults)
      *
      * @return             reference to the newly created checkbox group widget
      */
    KonfiguratorCheckBoxGroup *createCheckBoxGroup(int sizex, int sizey,
                                                   KONFIGURATOR_CHECKBOX_PARAM *params,
                                                   int paramNum, QWidget *parent = 0,
                                                   int page = FIRST_PAGE);
    /**
      * Creates a radio button group. A radio button group contains a lot of radio buttons.
      * The grouped buttons are embedded into one widget, which can be placed anywhere
      * on the GUI. The placing of the elements can be horizontal or vertical in the group.
      * At horizontal placing the sizex integer defines the maximum element number in
      * one row, sizey is 0. At vertical placing sizex is 0, and sizey defines the
      * maximum row number in one column.<br>
      *
      * The references of the buttons can be accessed by the find methods of KonfiguratorRadioButtons.
      * The first element is myRadioGrp->find( 0 ), "myRadio" element is myRadioGrp->find( "myRadio") ...
      *
      * Sample:<br><br>
      * KONFIGURATOR_NAME_VALUE_TIP radioInfo[] =<br>
      * &nbsp;{{ i18n( "radio text1" ), "value1", i18n( "tooltip1" ) },<br>
      * &nbsp;&nbsp;{ i18n( "radio text2" ), "value2", i18n( "tooltip2" ) },<br>
      * &nbsp;&nbsp;{ i18n( "radio text3" ), "value3", i18n( "tooltip3" ) }};<br><br>
      * KonfiguratorRadioButtons *myRadioGroup = createRadioButtonGroup( "class", "name", "value1",
      *  1, 0, radioInfo, 3, myParent, "myRadioGroup" );<br>
      * myRadioGroup->find( i18n( "radio text1" ) )->setEnabled( false );<br>
      * myLayout->addWidget( myRadioGroup, 0, 0 );<br>
      *
      * @param  configGroup     The class name used in KConfig (ex. "Archives")
      * @param  name            The item name used in KConfig (ex. "Do Tar")
      * @param  defaultValue    The default value of the radio buttons
      * @param  sizex           the maximum column number at horizontal placing
      * @param  sizey           the maximum row number at vertical placing
      * @param  params          pointer to the checkbox array
      * @param  paramNum        number of the checkbox elements
      * @param  parent          Reference to the parent widget
      * @param  restart         The change of this parameter requires Krusader restart
      * @param  page            The subpage of a Konfigurator page (because of setDefaults)
      *
      * @return             reference to the newly created radio button group widget
      */
    KonfiguratorRadioButtons *createRadioButtonGroup(QString configGroup, QString name,
                                                     QString defaultValue, int sizex, int sizey,
                                                     KONFIGURATOR_NAME_VALUE_TIP *params,
                                                     int paramNum, QWidget *parent = 0,
                                                     bool restart = false, int page = FIRST_PAGE);

    /**
      * This function is used to insert new, unknown items into KonfiguratorPage. The
      * item must be derived from KonfiguratorExtension class, which have
      * isChanged(), apply(), setDefaults, loadInitialValue() methods. After that, the
      * object is properly handled by Konfigurator page.
      *
      *
      * @param  item        The item to be added to KonfiguratorPage
      */
    void registerObject(KonfiguratorExtension *item);

    /**
      * This function is used to remove elements from KonfiguratorPage.
      *
      * Sample:<br><br>
      * KonfiguratorEditBox *myEditBox = createEditBox( "class", "name", "default", parentWidget);<br>
      * myLayout->addWidget( myEditBox, 0, 0 );<br>
      * removeObject( myEditBox->extension() );
      *
      * After the removeObject myEditBox will be untouched at apply(), setDefaults(), isChanged(),
      * loadInitialValues() methods of the KonfiguratorPage.
      *
      * @param  item        The item to be removed from KonfiguratorPage
      */
    void removeObject(KonfiguratorExtension *item);

    /**
      * Adds a new color chooser combobox item to the page.
      * <br>The chooser's widget's name is QString(configGroup + "/" + name).ascii()<br>
      *
      * Sample:<br><br>
      * KonfiguratorColorChooser *myColorChooser = createColorChooser( "class", "name", QColor( 255, 0, 255 ), parentWidget );<br>
      * myLayout->addWidget( myColorChooser, 0, 0 );
      *
      * @param  configGroup     The class name used in KConfig (ex. "Archives")
      * @param  name            The item name used in KConfig (ex. "Do Tar")
      * @param  defaultValue    The default value of the color chooser
      * @param  parent          Reference to the parent widget
      * @param  restart         The change of this parameter requires Krusader restart
      * @param  addColPtr       The additional color values
      * @param  restart         Number of additional colors
      * @param  page            The subpage of a Konfigurator page (because of setDefaults)
      *
      * @return             reference to the newly created combobox
      */
    KonfiguratorColorChooser *createColorChooser(QString configGroup, QString name,
                                                 QColor defaultValue, QWidget *parent = 0,
                                                 bool restart = false,
                                                 ADDITIONAL_COLOR *addColPtr = 0, int addColNum = 0,
                                                 int page = FIRST_PAGE);
signals:
    /**
      * The signal is emitted if the changed flag was modified in any konfigurator item.
      * Used for enabling/disabling the apply button.
      */
    void sigChanged();

protected:
    QList<KonfiguratorExtension *> itemList;

private:
    bool firstCall;
};

/**
  * KONFIGURATOR_CHECKBOX_PARAM is the basic item of checkbox arrays. It contains
  * every information related to a checkbox.
  */
struct KONFIGURATOR_CHECKBOX_PARAM {
    /**
      * The class used in KConfig (ex. "Archives")
      */
    QString configClass;
    /**
      * The item name used in KConfig (ex. "Do Tar")
      */
    QString configName;
    /**
      * The default value of the checkbox
      */
    bool defaultValue;
    /**
      * The text field of the checkbox
      */
    QString text;
    /**
      * The change of this parameter requires Krusader restart
      */
    bool restart;
    /**
      * The checkbox's tooltip
      */
    QString toolTip;
};

#endif /* __KONFIGURATOR_PAGE_H__ */
