//
//  LightEntityItem.cpp
//  libraries/entities/src
//
//  Created by Brad Hefta-Gaub on 12/4/13.
//  Copyright 2013 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

#include "LightEntityItem.h"

#include <QDebug>

#include <ByteCountCoding.h>

#include "EntitiesLogging.h"
#include "EntityItemID.h"
#include "EntityItemProperties.h"
#include "EntityTree.h"
#include "EntityTreeElement.h"

const bool LightEntityItem::DEFAULT_IS_SPOTLIGHT = false;
const float LightEntityItem::DEFAULT_INTENSITY = 1.0f;
const float LightEntityItem::DEFAULT_FALLOFF_RADIUS = 0.1f;
const float LightEntityItem::DEFAULT_EXPONENT = 0.0f;
const float LightEntityItem::MIN_CUTOFF = 0.0f;
const float LightEntityItem::MAX_CUTOFF = 90.0f;
const float LightEntityItem::DEFAULT_CUTOFF = PI / 2.0f;

bool LightEntityItem::_lightsArePickable = false;

EntityItemPointer LightEntityItem::factory(const EntityItemID& entityID, const EntityItemProperties& properties) {
    std::shared_ptr<LightEntityItem> entity(new LightEntityItem(entityID), [](LightEntityItem* ptr) { ptr->deleteLater(); });
    entity->setProperties(properties);
    return entity;
}

// our non-pure virtual subclass for now...
LightEntityItem::LightEntityItem(const EntityItemID& entityItemID) : EntityItem(entityItemID) {
    _type = EntityTypes::Light;
}

void LightEntityItem::setUnscaledDimensions(const glm::vec3& value) {
    if (_isSpotlight) {
        // If we are a spotlight, treat the z value as our radius or length, and
        // recalculate the x/y dimensions to properly encapsulate the spotlight.
        const float length = value.z;
        const float width = length * glm::sin(glm::radians(_cutoff));
        EntityItem::setUnscaledDimensions(glm::vec3(width, width, length));
    } else {
        float maxDimension = glm::compMax(value);
        EntityItem::setUnscaledDimensions(glm::vec3(maxDimension, maxDimension, maxDimension));
    }
}

EntityItemProperties LightEntityItem::getProperties(const EntityPropertyFlags& desiredProperties, bool allowEmptyDesiredProperties) const {
    EntityItemProperties properties = EntityItem::getProperties(desiredProperties, allowEmptyDesiredProperties); // get the properties from our base class

@Light_ENTITY_COPY_TO@

    return properties;
}

float LightEntityItem::getFalloffRadius() const {
    return resultWithReadLock<float>([&] {
        return _falloffRadius;
    });
}

void LightEntityItem::setFalloffRadius(float value) {
    value = glm::max(value, 0.0f);

    withWriteLock([&] {
        _needsRenderUpdate |= _falloffRadius != value;
        _falloffRadius = value;
    });
}

bool LightEntityItem::getIsSpotlight() const {
    return resultWithReadLock<bool>([&] {
        return _isSpotlight;
    });
}

void LightEntityItem::setIsSpotlight(bool value) {
    bool needsRenderUpdate;
    withWriteLock([&] {
        needsRenderUpdate = value != _isSpotlight;
        _needsRenderUpdate |= needsRenderUpdate;
        _isSpotlight = value;
    });

    if (!needsRenderUpdate) {
        return;
    }

    glm::vec3 dimensions = getScaledDimensions();
    glm::vec3 newDimensions;
    if (value) {
        const float length = dimensions.z;
        const float width = length * glm::sin(glm::radians(getCutoff()));
        newDimensions = glm::vec3(width, width, length);
    } else {
        newDimensions = glm::vec3(glm::compMax(dimensions));
    }

    setScaledDimensions(newDimensions);
}

float LightEntityItem::getCutoff() const {
    return resultWithReadLock<float>([&] {
        return _cutoff;
    });
}

void LightEntityItem::setCutoff(float value) {
    value = glm::clamp(value, MIN_CUTOFF, MAX_CUTOFF);
    bool needsRenderUpdate;
    bool spotlight;
    withWriteLock([&] {
        needsRenderUpdate = value != _cutoff;
        _needsRenderUpdate |= needsRenderUpdate;
        _cutoff = value;
        spotlight = _isSpotlight;
    });

    if (!needsRenderUpdate) {
        return;
    }

    if (spotlight) {
        // If we are a spotlight, adjusting the cutoff will affect the area we encapsulate,
        // so update the dimensions to reflect this.
        const float length = getScaledDimensions().z;
        const float width = length * glm::sin(glm::radians(_cutoff));
        setScaledDimensions(glm::vec3(width, width, length));
    }
}

bool LightEntityItem::setSubClassProperties(const EntityItemProperties& properties) {
    bool somethingChanged = false;

@Light_ENTITY_SET_FROM@

    return somethingChanged;
}

EntityPropertyFlags LightEntityItem::getEntityProperties(EncodeBitstreamParams& params) const {
    EntityPropertyFlags requestedProperties = EntityItem::getEntityProperties(params);

@Light_REQUESTED_PROPS@

    return requestedProperties;
}

int LightEntityItem::readEntitySubclassDataFromBuffer(const unsigned char* data, int bytesLeftToRead,
                                                ReadBitstreamToTreeParams& args,
                                                EntityPropertyFlags& propertyFlags, bool overwriteLocalData,
                                                bool& somethingChanged) {

    int bytesRead = 0;
    const unsigned char* dataAt = data;

@Light_ENTITY_READ@

    return bytesRead;
}

void LightEntityItem::appendSubclassData(OctreePacketData* packetData, EncodeBitstreamParams& params,
                                         EntityTreeElementExtraEncodeDataPointer entityTreeElementExtraEncodeData,
                                         EntityPropertyFlags& requestedProperties,
                                         EntityPropertyFlags& propertyFlags,
                                         EntityPropertyFlags& propertiesDidntFit,
                                         int& propertyCount,
                                         OctreeElement::AppendState& appendState) const {

    bool successPropertyFits = true;

@Light_ENTITY_APPEND@

}

void LightEntityItem::debugDump() const {
    qCDebug(entities) << "LightEntityItem id:" << getEntityItemID() << "---------------------------------------------";
    qCDebug(entities) << "    name:" << _name;
    qCDebug(entities) << "    position:" << debugTreeVector(getWorldPosition());
    qCDebug(entities) << "    dimensions:" << debugTreeVector(getScaledDimensions());
    qCDebug(entities) << "    editedAgo:" << debugTime(getLastEdited(), usecTimestampNow());
    qCDebug(entities) << "    pointer:" << this;

@Light_ENTITY_DEBUG@

}

bool LightEntityItem::findDetailedRayIntersection(const glm::vec3& origin, const glm::vec3& direction,
                        const glm::vec3& viewFrustumPos, OctreeElementPointer& element, float& distance,
                        BoxFace& face, glm::vec3& surfaceNormal,
                        QVariantMap& extraInfo, bool precisionPicking) const {

    // TODO: consider if this is really what we want to do. We've made it so that "lights are pickable" is a global state
    // this is probably reasonable since there's typically only one tree you'd be picking on at a time. Technically we could
    // be on the clipboard and someone might be trying to use the ray intersection API there. Anyway... if you ever try to
    // do ray intersection testing off of trees other than the main tree of the main entity renderer, then we'll need to
    // fix this mechanism.
    return _lightsArePickable;
}

bool LightEntityItem::findDetailedParabolaIntersection(const glm::vec3& origin, const glm::vec3& velocity,
                        const glm::vec3& acceleration, const glm::vec3& viewFrustumPos, OctreeElementPointer& element,
                        float& parabolicDistance, BoxFace& face, glm::vec3& surfaceNormal,
                        QVariantMap& extraInfo, bool precisionPicking) const {
    // TODO: consider if this is really what we want to do. We've made it so that "lights are pickable" is a global state
    // this is probably reasonable since there's typically only one tree you'd be picking on at a time. Technically we could
    // be on the clipboard and someone might be trying to use the parabola intersection API there. Anyway... if you ever try to
    // do parabola intersection testing off of trees other than the main tree of the main entity renderer, then we'll need to
    // fix this mechanism.
    return _lightsArePickable;
}