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#include "stickman.h"

#include "node.h"

#include <QPainter>

#include <QTimer>

#define _USE_MATH_DEFINES

#include <math.h>

#ifndef M_PI

#define M_PI 3.14159265358979323846

#endif

static const qreal Coords[NodeCount * 2] = {

    0.0, -150.0, // head, #0

    0.0, -100.0, // body pentagon, top->bottom, left->right, #1 - 5

    -50.0, -50.0,

    50.0, -50.0,

    -25.0, 50.0,

    25.0, 50.0,

    -100.0, 0.0, // right arm, #6 - 7

    -125.0, 50.0,

    100.0, 0.0, // left arm, #8 - 9

    125.0, 50.0,

    -35.0, 75.0, // lower body, #10 - 11

    35.0, 75.0,

    -25.0, 200.0, // right leg, #12 - 13

    -30.0, 300.0,

    25.0, 200.0, // left leg, #14 - 15

    30.0, 300.0

};

static const int Bones[BoneCount * 2] = {

    0, 1, // neck

    1, 2, // body

    1, 3,

    1, 4,

    1, 5,

    2, 3,

    2, 4,

    2, 5,

    3, 4,

    3, 5,

    4, 5,

    2, 6, // right arm

    6, 7,

    3, 8, // left arm

    8, 9,

    4, 10, // lower body

    4, 11,

    5, 10,

    5, 11,

    10, 11,

    10, 12, // right leg

    12, 13,

    11, 14, // left leg

    14, 15

};

StickMan::StickMan()

{

    m_sticks = true;

    m_isDead = false;

    m_pixmap = QPixmap("images/head.png");

    m_penColor = Qt::white;

    m_fillColor = Qt::black;

    // Set up start position of limbs

    for (int i=0; i<NodeCount; ++i) {

        m_nodes[i] = new Node(QPointF(Coords[i * 2], Coords[i * 2 + 1]), this);

        connect(m_nodes[i], SIGNAL(positionChanged()), this, SLOT(childPositionChanged()));

    }

    for (int i=0; i<BoneCount; ++i) {

        int n1 = Bones[i * 2];

        int n2 = Bones[i * 2 + 1];

        Node *node1 = m_nodes[n1];

        Node *node2 = m_nodes[n2];

        QPointF dist = node1->pos() - node2->pos();

        m_perfectBoneLengths[i] = sqrt(pow(dist.x(),2) + pow(dist.y(),2));

    }

    startTimer(10);

}

StickMan::~StickMan()

{

}

void StickMan::childPositionChanged()

{

    prepareGeometryChange();

}

void StickMan::setDrawSticks(bool on)

{

    m_sticks = on;

    for (int i=0;i<nodeCount();++i) {

        Node *node = m_nodes[i];

        node->setVisible(on);

    }

}

QRectF StickMan::boundingRect() const

{

    // account for head radius=50.0 plus pen which is 5.0

    return childrenBoundingRect().adjusted(-55.0, -55.0, 55.0, 55.0);

}

int StickMan::nodeCount() const

{

    return NodeCount;

}

Node *StickMan::node(int idx) const

{

    if (idx >= 0 && idx < NodeCount)

        return m_nodes[idx];

    else

        return 0;

}

void StickMan::timerEvent(QTimerEvent *)

{

    update();

}

void StickMan::stabilize()

{

    static const qreal threshold = 0.001;

    for (int i=0; i<BoneCount; ++i) {

        int n1 = Bones[i * 2];

        int n2 = Bones[i * 2 + 1];

        Node *node1 = m_nodes[n1];

        Node *node2 = m_nodes[n2];

        QPointF pos1 = node1->pos();

        QPointF pos2 = node2->pos();

        QPointF dist = pos1 - pos2;

        qreal length = sqrt(pow(dist.x(),2) + pow(dist.y(),2));

        qreal diff = (length - m_perfectBoneLengths[i]) / length;

        QPointF p = dist * (0.5 * diff);

        if (p.x() > threshold && p.y() > threshold) {

            pos1 -= p;

            pos2 += p;

            node1->setPos(pos1);

            node2->setPos(pos2);

        }

    }

}

QPointF StickMan::posFor(int idx) const

{

    return m_nodes[idx]->pos();

}

//#include <QTime>

void StickMan::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)

{

  /*  static int frames = 0;

    static QTime time;

    if (frames++ % 100 == 0) {

        frames = 1;

        time.restart();

    }

    if (time.elapsed() > 0) {

        painter->setPen(Qt::white);

        painter->drawText(0, 0, QString::number(frames / (time.elapsed() / 1000.0)));

    }*/

    stabilize();

    if (m_sticks) {

        painter->setPen(Qt::white);

        for (int i=0; i<BoneCount; ++i) {

            int n1 = Bones[i * 2];

            int n2 = Bones[i * 2 + 1];

            Node *node1 = m_nodes[n1];

            Node *node2 = m_nodes[n2];

            painter->drawLine(node1->pos(), node2->pos());

        }

    } else {

        // first bone is neck and will be used for head

        QPainterPath path;

        path.moveTo(posFor(0));

        path.lineTo(posFor(1));

        // right arm

        path.lineTo(posFor(2));

        path.lineTo(posFor(6));

        path.lineTo(posFor(7));

        // left arm

        path.moveTo(posFor(3));

        path.lineTo(posFor(8));

        path.lineTo(posFor(9));

        // body

        path.moveTo(posFor(2));

        path.lineTo(posFor(4));

        path.lineTo(posFor(10));

        path.lineTo(posFor(11));

        path.lineTo(posFor(5));

        path.lineTo(posFor(3));

        path.lineTo(posFor(1));

        // right leg

        path.moveTo(posFor(10));

        path.lineTo(posFor(12));

        path.lineTo(posFor(13));

        // left leg

        path.moveTo(posFor(11));

        path.lineTo(posFor(14));

        path.lineTo(posFor(15));

        painter->setPen(QPen(m_penColor, 5.0, Qt::SolidLine, Qt::RoundCap));

        painter->drawPath(path);

        {

            int n1 = Bones[0];

            int n2 = Bones[1];

            Node *node1 = m_nodes[n1];

            Node *node2 = m_nodes[n2];

            QPointF dist = node2->pos() - node1->pos();

            qreal sinAngle = dist.x() / sqrt(pow(dist.x(), 2) + pow(dist.y(), 2));

            qreal angle = asin(sinAngle) * 180.0 / M_PI;

            QPointF headPos = node1->pos();

            painter->translate(headPos);

            painter->rotate(-angle);

            painter->setBrush(m_fillColor);

            painter->drawEllipse(QPointF(0,0), 50.0, 50.0);

            painter->setBrush(m_penColor);

            painter->setPen(QPen(m_penColor, 2.5, Qt::SolidLine, Qt::RoundCap));

            // eyes

            if (m_isDead) {

                painter->drawLine(-30.0, -30.0, -20.0, -20.0);

                painter->drawLine(-20.0, -30.0, -30.0, -20.0);

                painter->drawLine(20.0, -30.0, 30.0, -20.0);

                painter->drawLine(30.0, -30.0, 20.0, -20.0);

            } else {

                painter->drawChord(QRectF(-30.0, -30.0, 25.0, 70.0), 30.0*16, 120.0*16);

                painter->drawChord(QRectF(5.0, -30.0, 25.0, 70.0), 30.0*16, 120.0*16);

            }

            // mouth

            if (m_isDead) {

                painter->drawLine(-28.0, 2.0, 29.0, 2.0);

            } else {

                painter->setBrush(QColor(128, 0, 64 ));

                painter->drawChord(QRectF(-28.0, 2.0-55.0/2.0, 57.0, 55.0), 0.0, -180.0*16);

            }

            // pupils

            if (!m_isDead) {

                painter->setPen(QPen(m_fillColor, 1.0, Qt::SolidLine, Qt::RoundCap));

                painter->setBrush(m_fillColor);

                painter->drawEllipse(QPointF(-12.0, -25.0), 5.0, 5.0);

                painter->drawEllipse(QPointF(22.0, -25.0), 5.0, 5.0);

            }

        }

    }

}