///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2017 F4EXB                                                      //
// written by Edouard Griffiths                                                  //
//                                                                               //
// Same as ValueDial but handles optionally positive and negative numbers with   //
// sign display.                                                                 //
//                                                                               //
// 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 as version 3 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 V3 for more details.                               //
//                                                                               //
// You should have received a copy of the GNU General Public License             //
// along with this program. If not, see <http://www.gnu.org/licenses/>.          //
///////////////////////////////////////////////////////////////////////////////////

#include <QPainter>
#include <QMouseEvent>
#include <QWheelEvent>
#include <QKeyEvent>
#include <QLocale>
#include <QApplication>

#include "gui/valuedialz.h"

ValueDialZ::ValueDialZ(bool positiveOnly, QWidget* parent, ColorMapper colorMapper) :
    QWidget(parent),
    m_positiveOnly(positiveOnly),
	m_animationState(0),
	m_colorMapper(colorMapper)
{
	setAutoFillBackground(false);
	setAttribute(Qt::WA_OpaquePaintEvent, true);
	setAttribute(Qt::WA_NoSystemBackground, true);
	setAttribute(Qt::WA_InputMethodEnabled, true);
	setMouseTracking(true);
	setFocusPolicy(Qt::StrongFocus);
	setInputMethodHints(Qt::ImhFormattedNumbersOnly);

	m_background.setStart(0, 0);
	m_background.setFinalStop(0, 1);
	m_background.setCoordinateMode(QGradient::ObjectBoundingMode);

	ColorMapper::colormap::const_iterator cmit = m_colorMapper.getDialBackgroundColorMap().begin();
	ColorMapper::colormap::const_iterator cmitEnd = m_colorMapper.getDialBackgroundColorMap().end();

	for (; cmit != cmitEnd; ++ cmit) {
		m_background.setColorAt(cmit->first, cmit->second);
	}

	m_value = 0;
	m_valueNew = 0;
	m_valueMin = m_positiveOnly ? 0 : -2200000;
	m_valueMax = 2200000;
	m_numDigits = 7;
	m_numDecimalPoints = m_numDigits / 3;
	m_cursor = -1;
	m_digitWidth = 0;
	m_digitHeight = 0;

	m_hightlightedDigit = -1;
	m_text = formatText(m_value);
	m_cursorState = false;

	const QLocale & cLocale = QLocale::c();
	m_groupSeparator = cLocale.groupSeparator();

	connect(&m_animationTimer, SIGNAL(timeout()), this, SLOT(animate()));
	connect(&m_blinkTimer, SIGNAL(timeout()), this, SLOT(blink()));
}

void ValueDialZ::setFont(const QFont& font)
{
	QWidget::setFont(font);

	QFontMetrics fm(font);
	m_digitWidth = fm.horizontalAdvance('0');
	m_digitHeight = fm.ascent();
	if(m_digitWidth < m_digitHeight)
		m_digitWidth = m_digitHeight;
	setFixedWidth((m_numDigits + m_numDecimalPoints + (m_positiveOnly ? 0 : 1)) * m_digitWidth + 2);
	setFixedHeight(m_digitHeight * 2 + 2);
}

void ValueDialZ::setBold(bool bold)
{
	QFont f = font();
	f.setBold(bold);
	setFont(f);
}

void ValueDialZ::setColorMapper(ColorMapper colorMapper)
{
	m_colorMapper = colorMapper;

	ColorMapper::colormap::const_iterator cmit = m_colorMapper.getDialBackgroundColorMap().begin();
	ColorMapper::colormap::const_iterator cmitEnd = m_colorMapper.getDialBackgroundColorMap().end();

	for (; cmit != cmitEnd; ++ cmit) {
		m_background.setColorAt(cmit->first, cmit->second);
	}
}


void ValueDialZ::setValue(qint64 value)
{
	m_valueNew = value;

	if(m_valueNew < m_valueMin) {
		m_valueNew = m_valueMin;
	}
	else if(m_valueNew > m_valueMax) {
		m_valueNew = m_valueMax;
	}

	if(m_valueNew < m_value) {
		m_animationState = 1;
	} else if(m_valueNew > m_value) {
		m_animationState = -1;
	} else {
	    return;
	}

	m_animationTimer.start(20);
	m_textNew = formatText(m_valueNew);
}

void ValueDialZ::setValueRange(bool positiveOnly, uint numDigits, qint64 min, qint64 max)
{
    m_positiveOnly = positiveOnly;
	m_numDigits = numDigits;
	m_numDecimalPoints = m_numDigits < 3 ? 0 : (m_numDigits%3) == 0 ? (m_numDigits/3)-1 : m_numDigits/3;

    setFixedWidth((m_numDigits + m_numDecimalPoints + (m_positiveOnly ? 0 : 1)) * m_digitWidth + 2);

	m_valueMin = positiveOnly ? (min < 0 ? 0 : min) : min;
	m_valueMax = positiveOnly ? (max < 0 ? 0 : max) : max;

	if(m_value < m_valueMin)
	{
		setValue(m_valueMin);
	}
	else if(m_value > m_valueMax)
	{
		setValue(m_valueMax);
	}
	else
	{
	    m_text = formatText(0);
	    m_textNew = m_text;
	    m_value = 0;
	    m_valueNew = m_value;
	    update();
	}
}

quint64 ValueDialZ::findExponent(int digit)
{
	quint64 e = 1;
	int d = (m_numDigits + m_numDecimalPoints + (m_positiveOnly ? 0 : 1)) - digit;
	d = d - (d / 4) - 1;
	for(int i = 0; i < d; i++)
		e *= 10;
	return e;
}

QChar ValueDialZ::digitNeigh(QChar c, bool dir)
{
    if (c == QChar('+')) {
        return QChar('-');
    } else if (c == QChar('-')) {
        return QChar('+');
    }

	if(dir)
	{
		if(c == QChar('0')) {
			return QChar('9');
		} else {
		    return QChar::fromLatin1(c.toLatin1() - 1);
		}
	}
	else
	{
		if(c == QChar('9')) {
			return QChar('0');
		} else {
		    return QChar::fromLatin1(c.toLatin1() + 1);
		}
	}
}

QString ValueDialZ::formatText(qint64 value)
{
    qDebug("ValueDialZ::formatText: value: %lld", value);
	QString str = QString("%1%2").arg(m_positiveOnly ? "" : value < 0 ? "-" : "+").arg(value < 0 ? -value : value, m_numDigits, 10, QChar('0'));

	for(int i = 0; i < m_numDecimalPoints; i++)
	{
	    int ipoint = m_numDigits + (m_positiveOnly ? 0 : 1) - 3 - 3 * i;

	    if (ipoint != 0) { // do not insert leading point
	        str.insert(ipoint, m_groupSeparator);
	    }
	}

	return str;
}

void ValueDialZ::paintEvent(QPaintEvent*)
{
    QPainter painter(this);

    painter.setPen(Qt::black);
    painter.setBrush(m_background);

    painter.drawRect(0, 0, width() - 1, height() - 1);

    painter.setPen(m_colorMapper.getBoundaryColor());
    painter.setBrush(Qt::NoBrush);

    for (int i = 1; i < 1 + m_numDigits + m_numDecimalPoints; i++)
    {
        painter.setPen(m_colorMapper.getBoundaryColor());
        painter.drawLine(1 + i * m_digitWidth, 1, 1 + i * m_digitWidth, height() - 1);
        painter.setPen(m_colorMapper.getBoundaryAlphaColor());
        painter.drawLine(0 + i * m_digitWidth, 1, 0 + i * m_digitWidth, height() - 1);
        painter.drawLine(2 + i * m_digitWidth, 1, 2 + i * m_digitWidth, height() - 1);
    }

    painter.setPen(m_colorMapper.getBoundaryAlphaColor());
    painter.drawLine(1, 1, 1, height() - 1);
    painter.drawLine(width() - 2, 1, width() - 2, height() - 1);

    // dial borders
    painter.setPen(m_colorMapper.getDarkBorderColor());
    painter.drawLine(0, 0, width() - 2, 0);
    painter.drawLine(0, height() - 1, 0, 0);
    painter.setPen(m_colorMapper.getLightBorderColor());
    painter.drawLine(1, height() - 1, width() - 1, height() - 1);
    painter.drawLine(width() - 1, height() - 1, width() - 1, 0);

    if (m_hightlightedDigit >= 0)
    {
        painter.setPen(Qt::NoPen);
        painter.setBrush(m_colorMapper.getHighlightColor());
        painter.drawRect(2 + m_hightlightedDigit * m_digitWidth, 1, m_digitWidth - 1, height() - 1);
    }

    if (m_animationState == 0)
    {
        for (int i = 0; i < m_text.length(); i++)
        {
            painter.setClipRect(1 + i * m_digitWidth, 1, m_digitWidth, m_digitHeight * 2);
            painter.setPen(m_colorMapper.getSecondaryForegroundColor());
            painter.drawText(QRect(1 + i * m_digitWidth, m_digitHeight * 0.6, m_digitWidth, m_digitHeight), Qt::AlignCenter, m_text.mid(i, 1));

            if (m_text[i] != m_groupSeparator)
            {
                painter.setPen(m_colorMapper.getForegroundColor());
                painter.drawText(QRect(1 + i * m_digitWidth, m_digitHeight * -0.7, m_digitWidth, m_digitHeight), Qt::AlignCenter, digitNeigh(m_text[i], true));
                painter.drawText(QRect(1 + i * m_digitWidth, m_digitHeight * 1.9, m_digitWidth, m_digitHeight), Qt::AlignCenter, digitNeigh(m_text[i], false));
            }
        }

        painter.setClipping(false);

        if ((m_cursor >= 0) && (m_cursorState))
        {
            painter.setPen(Qt::NoPen);
            painter.setBrush(m_colorMapper.getSecondaryForegroundColor());
            painter.drawRect(4 + m_cursor * m_digitWidth, 1 + m_digitHeight * 1.5, m_digitWidth - 5, m_digitHeight / 6);
        }
    }
    else
    {
        for(int i = 0; i < m_text.length(); i++)
        {
            if (m_text[i] == m_textNew[i])
            {
                painter.setClipRect(1 + i * m_digitWidth, 1, m_digitWidth, m_digitHeight * 2);
                painter.setPen(m_colorMapper.getSecondaryForegroundColor());
                painter.drawText(QRect(1 + i * m_digitWidth, m_digitHeight * 0.6, m_digitWidth, m_digitHeight), Qt::AlignCenter, m_text.mid(i, 1));

                if (m_text[i] != m_groupSeparator)
                {
                    painter.setPen(m_colorMapper.getForegroundColor());
                    painter.drawText(QRect(1 + i * m_digitWidth, m_digitHeight * -0.7, m_digitWidth, m_digitHeight), Qt::AlignCenter, digitNeigh(m_text[i], true));
                    painter.drawText(QRect(1 + i * m_digitWidth, m_digitHeight * 1.9, m_digitWidth, m_digitHeight), Qt::AlignCenter, digitNeigh(m_text[i], false));
                }
            }
            else
            {
                int h = m_digitHeight * 0.6 + m_digitHeight * m_animationState / 2.0;
                painter.setClipRect(1 + i * m_digitWidth, 1, m_digitWidth, m_digitHeight * 2);
                painter.setPen(m_colorMapper.getSecondaryForegroundColor());
                painter.drawText(QRect(1 + i * m_digitWidth, h, m_digitWidth, m_digitHeight), Qt::AlignCenter, m_text.mid(i, 1));

                if (m_text[i] != m_groupSeparator)
                {
                    painter.setPen(m_colorMapper.getForegroundColor());
                    painter.drawText(QRect(1 + i * m_digitWidth, h + m_digitHeight * -0.7, m_digitWidth, m_digitHeight), Qt::AlignCenter, digitNeigh(m_text[i], true));
                    painter.drawText(QRect(1 + i * m_digitWidth, h + m_digitHeight * 1.9, m_digitWidth, m_digitHeight), Qt::AlignCenter, digitNeigh(m_text[i], false));
                }
            }
        }
    }
}

void ValueDialZ::mousePressEvent(QMouseEvent* event)
{
    int i;

    i = (event->x() - 1) / m_digitWidth;

    if (m_positiveOnly)

    if ((m_text[i] == m_groupSeparator) || (m_text[i] == QChar('+')) || (m_text[i] == QChar('-')))
    {
        i++;

        if (i > m_numDigits + m_numDecimalPoints + (m_positiveOnly ? 0 : 1))
        {
            return;
        }
    }

    Qt::MouseButton mouseButton = event->button();

    if (mouseButton == Qt::RightButton) // ceil value at current digit
    {
        if(m_cursor >= 0)
        {
            m_cursor = -1;
            m_blinkTimer.stop();
            update();
        }

        qint64 e = findExponent(i);

        m_valueNew = (m_value / e) * e;
        setValue(m_valueNew);
        emit changed(m_valueNew);
        //qDebug("ValueDial::mousePressEvent: Qt::RightButton: i: %d e: %ll new: %ll", i, e, valueNew);
    }
    else if (mouseButton == Qt::LeftButton) // set cursor at current digit
    {
		if (qApp->autoSipEnabled())
		{
			QGuiApplication::inputMethod()->show();
		}

        m_cursor = i;
        m_cursorState = true;
        m_blinkTimer.start(400);

        update();
    }
}

void ValueDialZ::mouseMoveEvent(QMouseEvent* event)
{
    int i;

    i = (event->x() - 1) / m_digitWidth;

    if(m_text[i] == m_groupSeparator)
    {
        i = -1;
    }

    if(i != m_hightlightedDigit)
    {
        m_hightlightedDigit = i;
        update();
    }
}

void ValueDialZ::wheelEvent(QWheelEvent* event)
{
    int i;

    i = (event->x() - 1) / m_digitWidth;

    if (m_text[i] != m_groupSeparator)
    {
        m_hightlightedDigit = i;
    }
    else
    {
        return;
    }

    if (m_cursor >= 0)
    {
        m_cursor = -1;
        m_blinkTimer.stop();
        update();
    }

    if(m_animationState == 0)
    {
        if (!m_positiveOnly && (m_hightlightedDigit == 0))
        {
            m_valueNew = (-m_value < m_valueMin) ? m_valueMin : (-m_value > m_valueMax) ? m_valueMax : -m_value;
        }
        else
        {
            qint64 e = findExponent(m_hightlightedDigit);

            if(event->delta() < 0)
            {
                if (event->modifiers() & Qt::ShiftModifier) {
                    e *= 5;
                } else if (event->modifiers() & Qt::ControlModifier) {
                    e *= 2;
                }

                m_valueNew = (m_value - e < m_valueMin) ? m_valueMin : m_value - e;
            }
            else
            {
                if (event->modifiers() & Qt::ShiftModifier) {
                    e *= 5;
                } else if (event->modifiers() & Qt::ControlModifier) {
                    e *= 2;
                }

                m_valueNew = (m_value + e > m_valueMax) ? m_valueMax : m_value + e;
            }
        }

        setValue(m_valueNew);
        emit changed(m_valueNew);
	event->accept();
    }
}

void ValueDialZ::leaveEvent(QEvent*)
{
    if(m_hightlightedDigit != -1) {
        m_hightlightedDigit = -1;
        update();
    }
}

void ValueDialZ::keyPressEvent(QKeyEvent* value)
{
    if(m_cursor >= 0)
    {
        if((value->key() == Qt::Key_Return) || (value->key() == Qt::Key_Enter) || (value->key() == Qt::Key_Escape))
        {
            m_cursor = -1;
            m_cursorState = false;
            m_blinkTimer.stop();
            update();
            return;
        }
    }

    if((m_cursor < 0) && (m_hightlightedDigit >= 0))
    {
        m_cursor = m_hightlightedDigit;

        if (m_text[m_cursor] == m_groupSeparator) {
           m_cursor++;
        }

        if(m_cursor >= m_numDigits + m_numDecimalPoints + (m_positiveOnly ? 0 : 1)) {
            return;
        }

        m_cursorState = true;
        m_blinkTimer.start(400);
        update();
    }

    if(m_cursor < 0) {
        return;
    }

    if ((value->key() == Qt::Key_Left) || (value->key() == Qt::Key_Backspace))
    {
        if(m_cursor > 0)
        {
            m_cursor--;

            if (m_text[m_cursor] == m_groupSeparator) {
                m_cursor--;
            }

            if (m_cursor < 0) {
                m_cursor++;
            }

            m_cursorState = true;
            update();
            return;
        }
    }
    else if(value->key() == Qt::Key_Right)
    {
        if(m_cursor < m_numDecimalPoints + m_numDigits)
        {
            m_cursor++;

            if (m_text[m_cursor] == m_groupSeparator) {
                m_cursor++;
            }

            if(m_cursor >= m_numDecimalPoints + m_numDigits + (m_positiveOnly ? 0 : 1)) {
                m_cursor--;
            }

            m_cursorState = true;
            update();
            return;
        }
    }
    else if(value->key() == Qt::Key_Up)
    {
        if (!m_positiveOnly && (m_cursor == 0))
        {
            if(m_animationState != 0) {
                m_value = m_valueNew;
            }

            m_valueNew = (-m_value < m_valueMin) ? m_valueMin : (-m_value > m_valueMax) ? m_valueMax : -m_value;
        }
        else
        {
            qint64 e = findExponent(m_cursor);

            if (value->modifiers() & Qt::ShiftModifier) {
                e *= 5;
            } else if (value->modifiers() & Qt::ControlModifier) {
                e *= 2;
            }

            if(m_animationState != 0) {
                m_value = m_valueNew;
            }

            m_valueNew = m_value + e > m_valueMax ? m_valueMax : m_value + e;
        }

        setValue(m_valueNew);
        emit changed(m_valueNew);
    }
    else if(value->key() == Qt::Key_Down)
    {
        if (!m_positiveOnly && (m_cursor == 0))
        {
            if(m_animationState != 0) {
                m_value = m_valueNew;
            }

            m_valueNew = (-m_value < m_valueMin) ? m_valueMin : (-m_value > m_valueMax) ? m_valueMax : -m_value;
        }
        else
        {
            qint64 e = findExponent(m_cursor);

            if (value->modifiers() & Qt::ShiftModifier) {
                e *= 5;
            } else if (value->modifiers() & Qt::ControlModifier) {
                e *= 2;
            }

            if(m_animationState != 0) {
                m_value = m_valueNew;
            }

            m_valueNew = m_value - e < m_valueMin ? m_valueMin : m_value - e;
        }

        setValue(m_valueNew);
        emit changed(m_valueNew);
    }

    if(value->text().length() != 1) {
        return;
    }

    QChar c = value->text()[0];

    if ((c == QChar('+')) && (m_cursor == 0) && (m_text[m_cursor] == QChar('-'))) // change sign to positive
    {
        setValue(-m_value);
        emit changed(m_valueNew);
        update();
    }
    else if ((c == QChar('-')) && (m_cursor == 0) && (m_text[m_cursor] == QChar('+'))) // change sign to negative
    {
        setValue(-m_value);
        emit changed(m_valueNew);
        update();
    }
    else if ((c >= QChar('0')) && (c <= QChar('9')) && (m_cursor > 0)) // digits
    {
        int d = c.toLatin1() - '0';
        quint64 e = findExponent(m_cursor);
        quint64 value = abs(m_value);
        int sign = m_value < 0 ? -1 : 1;
        quint64 v = (value / e) % 10;

        if(m_animationState != 0) {
            m_value = m_valueNew;
        }

        v = value - v * e;
        v += d * e;
        setValue(sign*v);
        emit changed(m_valueNew);
        m_cursor++;

        if (m_text[m_cursor] == m_groupSeparator) {
           m_cursor++;
        }

        if(m_cursor >= m_numDigits + m_numDecimalPoints + (m_positiveOnly ? 0 : 1))
        {
            m_cursor = -1;
            m_blinkTimer.stop();
        }
        else
        {
            m_cursorState = true;
        }

        update();
    }
}

void ValueDialZ::focusInEvent(QFocusEvent*)
{
    if(m_cursor == -1) {
        m_cursor = 0;
        m_cursorState = true;
        m_blinkTimer.start(400);
        update();
    }
}

void ValueDialZ::focusOutEvent(QFocusEvent*)
{
	m_cursor = -1;
	m_blinkTimer.stop();
	update();
}

void ValueDialZ::animate()
{
	update();

	if(m_animationState > 0)
		m_animationState++;
	else if(m_animationState < 0)
		m_animationState--;
	else {
		m_animationTimer.stop();
		m_animationState = 0;
		return;
	}

	if(abs(m_animationState) >= 4) {
		m_animationState = 0;
		m_animationTimer.stop();
		m_value = m_valueNew;
		m_text = m_textNew;
	}
}

void ValueDialZ::blink()
{
	if(m_cursor >= 0) {
		m_cursorState = !m_cursorState;
		update();
	}
}