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#include "gauge.h"
#include "gaugenode.h"

#include <QtQuick/qsgnode.h>
#include <QtQuick/qsgflatcolormaterial.h>
#include <QtMath>

Gauge::Gauge(QQuickItem *parent)
    : QQuickItem(parent)
    , m_value(0)
    , m_angle(0)
    , m_numVertices(128)
    , m_fillWidth(10)
    , m_radius(0)
    , m_lefttoright(true)
    , m_minAngle(0)
    , m_maxAngle(270)
    , m_minValue(0)
    , m_maxValue(240)
    , m_doNotFill(false)
    , m_color(QColor(255, 0, 0))
    , arc_length(0)
    , arc_dist_per_vertices(0)
    , frontCutDeg(0.0)
    , backCutDeg(0.0)
    , frontCutRad(0.0)
    , backCutRad(0.0)
    , m_cutRad(0)
{
    setFlag(ItemHasContents, true);
}

Gauge::~Gauge()
{
}

void Gauge::setValue(qreal value)
{
    if (m_value == value)
        return;

    m_value = value;
    updateValue();

    emit valueChanged(value);
    update();
}

void Gauge::setNumVertices(int numVertices)
{
    if (m_numVertices == numVertices)
        return;

    m_numVertices = numVertices;
    emit numVerticesChanged(numVertices);
    update();
}

void Gauge::setFillWidth(double fillWidth)
{
    if (m_fillWidth == fillWidth)
        return;

    m_fillWidth = fillWidth;
    emit fillWidthChanged(m_fillWidth);
    update();
}

void Gauge::setRadius(int radius)
{
    if (m_radius == radius)
        return;

    m_radius = radius;
    emit radiusChanged(m_radius);
    update();
}

void Gauge::setMinAngle(double minAngle)
{
    if (m_minAngle == minAngle)
        return;

    m_minAngle = minAngle;

    backCutDeg = m_minAngle;
    backCutRad = qDegreesToRadians(backCutDeg);

    if (m_minAngle < m_maxAngle)
        m_lefttoright = true;
    else
        m_lefttoright = false;

    updateValue();

    emit minAngleChanged(m_minAngle);
    update();
}

void Gauge::setMaxAngle(double maxAngle)
{
    if (m_maxAngle == maxAngle)
        return;

    m_maxAngle = maxAngle;

    if (m_minAngle < m_maxAngle)
        m_lefttoright = true;
    else
        m_lefttoright = false;

    updateValue();
    emit maxAngleChanged(m_maxAngle);
    update();
}

void Gauge::setMinValue(double minValue)
{
    if (m_minValue == minValue)
        return;

    m_minValue = minValue;
    emit minValueChanged(m_minValue);
    update();
}

void Gauge::setMaxValue(double maxValue)
{
    if (m_maxValue == maxValue)
        return;

    m_maxValue = maxValue;
    emit maxValueChanged(m_maxValue);
    update();
}

void Gauge::setDoNotFill(bool doNotFill)
{
    if (m_doNotFill == doNotFill)
        return;

    m_doNotFill = doNotFill;
    emit doNotFillChanged(m_doNotFill);
    update();
}

void Gauge::setColor(QColor color)
{
    if (m_color == color)
        return;

    m_color = color;
    emit colorChanged(m_color);
    update();
}

void Gauge::updateValue()
{
    calcArc();
}

void Gauge::calcArc()
{
    backCutDeg = m_minAngle;
    backCutRad = qDegreesToRadians(backCutDeg - 270);

    m_angle = ((m_maxAngle - m_minAngle) / (m_maxValue - m_minValue))
            * (m_value - m_minValue);

    arc_length = qDegreesToRadians(m_angle);
    arc_dist_per_vertices = arc_length / m_numVertices;

    emit angleChanged(m_angle);
}

QSGNode *Gauge::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *)
{
    GaugeNode *n = static_cast<GaugeNode *>(oldNode);

    if (!n)
        n = new GaugeNode(m_numVertices, m_color, m_doNotFill);

    n->setLeftToRight(m_lefttoright);
    n->setColor(m_color);
    n->setBoundingRect(boundingRect());
    n->setDoNotFill(m_doNotFill);
    n->setBackCutRad(backCutRad);
    n->setRadius(m_radius);
    n->setArcDistPerVert(arc_dist_per_vertices);
    n->setNumVertices(m_numVertices);
    n->setFillWidth(m_fillWidth);
    n->draw();
    return n;
}

#if QT_VERSION >= 0x060000
void Gauge::geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry)
{
    QQuickItem::geometryChange(newGeometry, oldGeometry);
#else
void Gauge::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
{
    QQuickItem::geometryChanged(newGeometry, oldGeometry);
#endif
    if (m_radius == 0)
        setRadius(newGeometry.height() * 0.5);

    calcArc();
    update();
}