/***************************************************************************
 *   Copyright (C) 2020 by S. MANKOWSKI / G. DE BURE support@mankowski.fr  *
 *                                                                         *
 *   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 2 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 <https://www.gnu.org/licenses/>  *
 ***************************************************************************/
#ifndef SKGCALCULATOREDIT_H
#define SKGCALCULATOREDIT_H
/** @file
 * A QLineEdit with calculator included.
 *
 * @author Stephane MANKOWSKI / Guillaume DE BURE
 */

#include "skgbasegui_export.h"
#include <qlineedit.h>
/**
 * This file is a QLineEdit with calculator included
 */
class SKGBASEGUI_EXPORT SKGCalculatorEdit : public QLineEdit
{
    Q_OBJECT
    /**
     * Value of the calculator editor
     */
    Q_PROPERTY(double value READ value WRITE setValue USER true NOTIFY modified)

    /**
     * Mode of the calculator editor
     */
    Q_PROPERTY(SKGCalculatorEdit::Mode mode READ mode WRITE setMode NOTIFY modified)

    /**
     * Sign of the calculator editor
     */
    Q_PROPERTY(double sign READ sign NOTIFY modified)

    /**
     * To know if the text is valid
     */
    Q_PROPERTY(bool valid READ valid NOTIFY modified)

public:
    /**
     * This enumerate defines type of calculator
     */
    enum Mode {CALCULATOR, /**< simple calculator */
               EXPRESSION /**< expression is evaluated */
              };
    /**
     * Mode of the calculator editor
     */
    Q_ENUM(Mode)

    /**
     * Default Constructor
     * @param iParent the parent
     */
    explicit SKGCalculatorEdit(QWidget* iParent);

    /**
     * Default Destructor
     */
    ~SKGCalculatorEdit() override;

    /**
     * Get the mode
     * @return the mode
     */
    virtual Mode mode() const;


    /**
     * Set the mode
     * @param iMode the mode
     */
    virtual void setMode(Mode iMode);

    /**
     * Get the value
     * @return the value
     */
    virtual double value();

    /**
     * Set the value
     * @param iValue the value
     */
    virtual void setValue(double iValue);

    /**
     * Set the text
     * @param iText the text
     */
    virtual void setText(const QString& iText);

    /**
     * Get the sign of the value.
     * 1 if the value is write like "+5"
     * -1 if the value is write like "-5"
     * 0 if the value is write like "5"
     * @return the sign
     */
    virtual int sign() const;

    /**
     * To know if the text is a valid value
     * @return validation
     */
    virtual bool valid();

    /**
     * To formula
     * @return the formula
     */
    virtual QString formula();

    /**
     * Add a parameter
     * @param iParameter the parameter name
     * @param iValue the value
     */
    virtual void addParameterValue(const QString& iParameter, double iValue);

Q_SIGNALS:
    /**
     * This signal is launched when the object is modified
     */
    void modified();

protected:
    /**
     * This event handler, for event event, can be reimplemented in a subclass to receive key press events for the widget.
     * @param iEvent the event
     */
    void keyPressEvent(QKeyEvent* iEvent) override;

    /**
     * This event handler can be reimplemented in a subclass to receive keyboard focus events (focus lost) for the widget. The events is passed in the event parameter.
     * @param iEvent the event
     */
    void focusOutEvent(QFocusEvent* iEvent) override;

private:
    Q_DISABLE_COPY(SKGCalculatorEdit)

    void keyPressEvent(int key);
    double getEvaluatedValue(bool& iOk);
    double m_lastValue;
    int m_lastOperator;
    Mode m_currentMode;

    QColor m_fontColor;
    QMap<QString, double> m_parameters;
    QString m_formula;
};

#endif  // SKGCALCULATOREDIT_H
