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#include "texture_p.h"

#include <QDebug>
#include <QOpenGLFunctions>
#include <QOpenGLTexture>
#include <Qt3DCore/qpropertyupdatedchange.h>
#include <Qt3DCore/qpropertynodeaddedchange.h>
#include <Qt3DCore/qpropertynoderemovedchange.h>

#include <Qt3DRender/private/texture_p.h>
#include <Qt3DRender/private/qabstracttexture_p.h>
#include <Qt3DRender/private/gltexturemanager_p.h>
#include <Qt3DRender/private/managers_p.h>

QT_BEGIN_NAMESPACE

using namespace Qt3DCore;

namespace Qt3DRender {
namespace Render {

Texture::Texture()
    // We need backend -> frontend notifications to update the status of the texture
    : BackendNode(ReadWrite)
    , m_dirty(DirtyImageGenerators|DirtyProperties|DirtyParameters|DirtyDataGenerator)
    , m_textureImageManager(nullptr)
{
}

Texture::~Texture()
{
    // We do not abandon the api texture
    // because if the dtor is called that means
    // the manager was destroyed otherwise cleanup
    // would have been called
}

void Texture::setTextureImageManager(TextureImageManager *manager)
{
    m_textureImageManager = manager;
}

void Texture::addDirtyFlag(DirtyFlags flags)
{
    m_dirty |= flags;
}

void Texture::unsetDirty()
{
    m_dirty = Texture::NotDirty;
}

void Texture::addTextureImage(Qt3DCore::QNodeId id)
{
    if (!m_textureImageManager) {
        qWarning() << "[Qt3DRender::TextureNode] addTextureImage: invalid TextureImageManager";
        return;
    }

    const HTextureImage handle = m_textureImageManager->lookupHandle(id);
    if (handle.isNull()) {
        qWarning() << "[Qt3DRender::TextureNode] addTextureImage: image handle is NULL";
    } else if (!m_textureImages.contains(handle)) {
        m_textureImages << handle;
        addDirtyFlag(DirtyImageGenerators);
    }
}

void Texture::removeTextureImage(Qt3DCore::QNodeId id)
{
    if (!m_textureImageManager) {
        qWarning() << "[Qt3DRender::TextureNode] removeTextureImage: invalid TextureImageManager";
        return;
    }

    const HTextureImage handle = m_textureImageManager->lookupHandle(id);
    if (handle.isNull()) {
        qWarning() << "[Qt3DRender::TextureNode] removeTextureImage: image handle is NULL";
    } else {
        m_textureImages.removeAll(handle);
        addDirtyFlag(DirtyImageGenerators);
    }
}

// This is called by Renderer::updateGLResources
// when the texture has been marked for cleanup
void Texture::cleanup()
{
    // Whoever calls this must make sure to also check if this
    // texture is being referenced by a shared API specific texture (GLTexture)
    m_dataFunctor.reset();
    m_textureImages.clear();

    // set default values
    m_properties.width = 1;
    m_properties.height = 1;
    m_properties.depth = 1;
    m_properties.layers = 1;
    m_properties.mipLevels = 1;
    m_properties.samples = 1;
    m_properties.generateMipMaps = false;
    m_properties.format = QAbstractTexture::RGBA8_UNorm;
    m_properties.target = QAbstractTexture::Target2D;

    m_parameters.magnificationFilter = QAbstractTexture::Nearest;
    m_parameters.minificationFilter = QAbstractTexture::Nearest;
    m_parameters.wrapModeX = QTextureWrapMode::ClampToEdge;
    m_parameters.wrapModeY = QTextureWrapMode::ClampToEdge;
    m_parameters.wrapModeZ = QTextureWrapMode::ClampToEdge;
    m_parameters.maximumAnisotropy = 1.0f;
    m_parameters.comparisonFunction = QAbstractTexture::CompareLessEqual;
    m_parameters.comparisonMode = QAbstractTexture::CompareNone;

    m_dirty = NotDirty;
}

// ChangeArbiter/Aspect Thread
void Texture::sceneChangeEvent(const Qt3DCore::QSceneChangePtr &e)
{
    DirtyFlags dirty;

    switch (e->type()) {
    case PropertyUpdated: {
        QPropertyUpdatedChangePtr propertyChange = qSharedPointerCast<QPropertyUpdatedChange>(e);
        if (propertyChange->propertyName() == QByteArrayLiteral("width")) {
            m_properties.width = propertyChange->value().toInt();
            dirty = DirtyProperties;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("height")) {
            m_properties.height = propertyChange->value().toInt();
            dirty = DirtyProperties;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("depth")) {
            m_properties.depth = propertyChange->value().toInt();
            dirty = DirtyProperties;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("maximumLayers")) {
            m_properties.layers = propertyChange->value().toInt();
            dirty = DirtyProperties;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("format")) {
            m_properties.format = static_cast<QAbstractTexture::TextureFormat>(propertyChange->value().toInt());
            dirty = DirtyProperties;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("target")) {
            m_properties.target = static_cast<QAbstractTexture::Target>(propertyChange->value().toInt());
            dirty = DirtyProperties;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("mipmaps")) {
            m_properties.generateMipMaps = propertyChange->value().toBool();
            dirty = DirtyProperties;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("minificationFilter")) {
            m_parameters.minificationFilter = static_cast<QAbstractTexture::Filter>(propertyChange->value().toInt());
            dirty = DirtyParameters;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("magnificationFilter")) {
            m_parameters.magnificationFilter = static_cast<QAbstractTexture::Filter>(propertyChange->value().toInt());
            dirty = DirtyParameters;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("wrapModeX")) {
            m_parameters.wrapModeX = static_cast<QTextureWrapMode::WrapMode>(propertyChange->value().toInt());
            dirty = DirtyParameters;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("wrapModeY")) {
            m_parameters.wrapModeY = static_cast<QTextureWrapMode::WrapMode>(propertyChange->value().toInt());
            dirty = DirtyParameters;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("wrapModeZ")) {
            m_parameters.wrapModeZ =static_cast<QTextureWrapMode::WrapMode>(propertyChange->value().toInt());
            dirty = DirtyParameters;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("maximumAnisotropy")) {
            m_parameters.maximumAnisotropy = propertyChange->value().toFloat();
            dirty = DirtyParameters;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("comparisonFunction")) {
            m_parameters.comparisonFunction = propertyChange->value().value<QAbstractTexture::ComparisonFunction>();
            dirty = DirtyParameters;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("comparisonMode")) {
            m_parameters.comparisonMode = propertyChange->value().value<QAbstractTexture::ComparisonMode>();
            dirty = DirtyParameters;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("layers")) {
            m_properties.layers = propertyChange->value().toInt();
            dirty = DirtyProperties;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("samples")) {
            m_properties.samples = propertyChange->value().toInt();
            dirty = DirtyProperties;
        } else if (propertyChange->propertyName() == QByteArrayLiteral("generator")) {
            m_dataFunctor = propertyChange->value().value<QTextureGeneratorPtr>();
            dirty = DirtyDataGenerator;
        }
    }
        break;

    case PropertyValueAdded: {
        const auto change = qSharedPointerCast<QPropertyNodeAddedChange>(e);
        if (change->propertyName() == QByteArrayLiteral("textureImage")) {
            addTextureImage(change->addedNodeId());
        }
    }
        break;

    case PropertyValueRemoved: {
        const auto change = qSharedPointerCast<QPropertyNodeRemovedChange>(e);
        if (change->propertyName() == QByteArrayLiteral("textureImage")) {
            removeTextureImage(change->removedNodeId());
        }
    }
        break;

    default:
        break;

    }

    addDirtyFlag(dirty);

    markDirty(AbstractRenderer::AllDirty);
    BackendNode::sceneChangeEvent(e);
}

bool Texture::isValid() const
{
    for (const auto handle : m_textureImages) {
        TextureImage *img = m_textureImageManager->data(handle);
        if (img == nullptr)
            return false;
    }
    return true;
}

void Texture::initializeFromPeer(const Qt3DCore::QNodeCreatedChangeBasePtr &change)
{
    const auto typedChange = qSharedPointerCast<Qt3DCore::QNodeCreatedChange<QAbstractTextureData>>(change);
    const auto &data = typedChange->data;

    m_properties.target = data.target;
    m_properties.format = data.format;
    m_properties.width = data.width;
    m_properties.height = data.height;
    m_properties.depth = data.depth;
    m_properties.generateMipMaps = data.autoMipMap;
    m_properties.layers = data.layers;
    m_properties.samples = data.samples;
    m_parameters.minificationFilter = data.minFilter;
    m_parameters.magnificationFilter = data.magFilter;
    m_parameters.wrapModeX = data.wrapModeX;
    m_parameters.wrapModeY = data.wrapModeY;
    m_parameters.wrapModeZ = data.wrapModeZ;
    m_parameters.maximumAnisotropy = data.maximumAnisotropy;
    m_parameters.comparisonFunction = data.comparisonFunction;
    m_parameters.comparisonMode = data.comparisonMode;
    m_dataFunctor = data.dataFunctor;

    addDirtyFlag(DirtyFlags(DirtyImageGenerators|DirtyProperties|DirtyParameters));
}


TextureFunctor::TextureFunctor(AbstractRenderer *renderer,
                               TextureManager *textureNodeManager,
                               TextureImageManager *textureImageManager)
    : m_renderer(renderer)
    , m_textureNodeManager(textureNodeManager)
    , m_textureImageManager(textureImageManager)
{
}

Qt3DCore::QBackendNode *TextureFunctor::create(const Qt3DCore::QNodeCreatedChangeBasePtr &change) const
{
    Texture *backend = m_textureNodeManager->getOrCreateResource(change->subjectId());
    backend->setTextureImageManager(m_textureImageManager);
    backend->setRenderer(m_renderer);
    return backend;
}

Qt3DCore::QBackendNode *TextureFunctor::get(Qt3DCore::QNodeId id) const
{
    return m_textureNodeManager->lookupResource(id);
}

void TextureFunctor::destroy(Qt3DCore::QNodeId id) const
{
    m_textureNodeManager->addTextureIdToCleanup(id);
    // We only add ourselves to the dirty list
    // The actual removal needs to be performed after we have
    // destroyed the associated APITexture in the RenderThread
}


} // namespace Render
} // namespace Qt3DRender

QT_END_NAMESPACE
