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#include <QGuiApplication>

#include <Qt3DCore/QEntity>
#include <Qt3DRender/QCamera>
#include <Qt3DRender/QCameraLens>
#include <Qt3DCore/QTransform>
#include <Qt3DCore/QAspectEngine>

#include <Qt3DInput/QInputAspect>

#include <Qt3DRender/QRenderAspect>
#include <Qt3DExtras/QForwardRenderer>
#include <Qt3DExtras/QPhongMaterial>
#include <Qt3DExtras/QCylinderMesh>
#include <Qt3DExtras/QSphereMesh>
#include <Qt3DExtras/QTorusMesh>

#include <QPropertyAnimation>

#include "qt3dwindow.h"


#include <Qt3DCore/QEntity>
#include <Qt3DCore/QTransform>
#include <Qt3DExtras/QPhongMaterial>
#include <Qt3DRender/QAttribute>
#include <Qt3DRender/QBuffer>
#include <Qt3DRender/QGeometry>

#include <QElapsedTimer>

void drawLineStrip(const QVector<QVector3D>& vertices, const QVector<unsigned int>& indices, const QColor& color, Qt3DCore::QEntity* _rootEntity)
{
    auto geometry = new Qt3DRender::QGeometry(_rootEntity);

    // position vertices (start and end)
    QByteArray bufferBytes;
    bufferBytes.resize(3 * vertices.size() * sizeof(float)); // start.x, start.y, start.end + end.x, end.y, end.z
    auto positions = reinterpret_cast<float*>(bufferBytes.data());
    for (int n = vertices.size(), i = 0; i < n; ++i)
    {
        *positions++ = vertices[i].x();
        *positions++ = vertices[i].y();
        *positions++ = vertices[i].z();
    }

    auto buf = new Qt3DRender::QBuffer(geometry);
    buf->setData(bufferBytes);

    auto positionAttribute = new Qt3DRender::QAttribute(geometry);
    positionAttribute->setName(Qt3DRender::QAttribute::defaultPositionAttributeName());
    positionAttribute->setVertexBaseType(Qt3DRender::QAttribute::Float);
    positionAttribute->setVertexSize(3);
    positionAttribute->setAttributeType(Qt3DRender::QAttribute::VertexAttribute);
    positionAttribute->setBuffer(buf);
    positionAttribute->setByteStride(3 * sizeof(float));
    positionAttribute->setCount(vertices.size());
    geometry->addAttribute(positionAttribute); // We add the vertices in the geometry

    // connectivity between vertices
    QByteArray indexBytes;
    indexBytes.resize(indices.size() * sizeof(unsigned int)); // start to end
    memcpy(indexBytes.data(), indices.data(), indices.size() * sizeof(unsigned int));

    auto indexBuffer = new Qt3DRender::QBuffer(geometry);
    indexBuffer->setData(indexBytes);

    auto indexAttribute = new Qt3DRender::QAttribute(geometry);
    indexAttribute->setVertexBaseType(Qt3DRender::QAttribute::UnsignedInt);
    indexAttribute->setAttributeType(Qt3DRender::QAttribute::IndexAttribute);
    indexAttribute->setVertexSize(1);
    indexAttribute->setBuffer(indexBuffer);
    indexAttribute->setByteStride(1 * sizeof(unsigned int));
    indexAttribute->setCount(indices.size());
    geometry->addAttribute(indexAttribute); // We add the indices linking the points in the geometry

    // mesh
    auto line = new Qt3DRender::QGeometryRenderer(_rootEntity);
    line->setGeometry(geometry);
    line->setRestartIndexValue(-1);
    line->setPrimitiveRestartEnabled(true);
    line->setPrimitiveType(Qt3DRender::QGeometryRenderer::LineStrip);
    auto material = new Qt3DExtras::QPhongMaterial(_rootEntity);
    material->setAmbient(color);

    // entity
    auto lineEntity = new Qt3DCore::QEntity(_rootEntity);
    lineEntity->addComponent(line);
    lineEntity->addComponent(material);
}

int main(int argc, char* argv[])
{
    QGuiApplication app(argc, argv);
    Qt3DExtras::Qt3DWindow view;

    Qt3DCore::QEntity *scene = new Qt3DCore::QEntity;

    // Camera
    Qt3DRender::QCamera *camera = view.camera();
    camera->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
    camera->setPosition(QVector3D(0, 0, 2.0f));
    camera->setViewCenter(QVector3D(0, 0, 0));

    QColor red(255,0,0);

    QVector<QVector3D> vertices;
    vertices.resize(((10000) + 1) * 5);
    QVector<unsigned int> indices;
    indices.resize(((10000) + 1) * 6);
    double i = 0;
    int k = 0;
    while (i < 1000) {
        int vIdx = 5 * k;
        vertices[vIdx + 0] = QVector3D(0, 0, -i / 10.0);
        vertices[vIdx + 1] = QVector3D(1, 0, -i / 10.0);
        vertices[vIdx + 2] = QVector3D(1, 1, -i / 10.0);
        vertices[vIdx + 3] = QVector3D(0, 1, -i / 10.0);
        vertices[vIdx + 4] = QVector3D(0, 0, -i / 10.0);
        int idx = 6 * k;
        indices[idx + 0] = vIdx + 0;
        indices[idx + 1] = vIdx + 1;
        indices[idx + 2] = vIdx + 2;
        indices[idx + 3] = vIdx + 3;
        indices[idx + 4] = vIdx + 4;
        indices[idx + 5] = -1;
        i += 0.1;
        ++k;
    }
    drawLineStrip(vertices, indices, red, scene);

    view.setRootEntity(scene);
    view.show();

    return app.exec();
}