//
//  EntityScriptingInterface.h
//  libraries/entities/src
//
//  Created by Brad Hefta-Gaub on 12/6/13.
//  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
//
// TODO: How will we handle collision callbacks with Entities
//

#ifndef hifi_EntityScriptingInterface_h
#define hifi_EntityScriptingInterface_h

#include <QtCore/QObject>

#include <DependencyManager.h>
#include <Octree.h>
#include <OctreeScriptingInterface.h>
#include <RegisteredMetaTypes.h>

#include "PolyVoxEntityItem.h"
#include "LineEntityItem.h"
#include "PolyLineEntityItem.h"
#include "EntityTree.h"

#include "EntityEditPacketSender.h"
#include "EntitiesScriptEngineProvider.h"
#include "EntityItemProperties.h"

class EntityTree;
class MouseEvent;

class RayToEntityIntersectionResult {
public:
    RayToEntityIntersectionResult();
    bool intersects;
    bool accurate;
    QUuid entityID;
    EntityItemProperties properties;
    float distance;
    BoxFace face;
    glm::vec3 intersection;
    glm::vec3 surfaceNormal;
    EntityItemPointer entity;
};

Q_DECLARE_METATYPE(RayToEntityIntersectionResult)

QScriptValue RayToEntityIntersectionResultToScriptValue(QScriptEngine* engine, const RayToEntityIntersectionResult& results);
void RayToEntityIntersectionResultFromScriptValue(const QScriptValue& object, RayToEntityIntersectionResult& results);


/// handles scripting of Entity commands from JS passed to assigned clients
class EntityScriptingInterface : public OctreeScriptingInterface, public Dependency  {
    Q_OBJECT
public:
    EntityScriptingInterface();

    EntityEditPacketSender* getEntityPacketSender() const { return (EntityEditPacketSender*)getPacketSender(); }
    virtual NodeType_t getServerNodeType() const { return NodeType::EntityServer; }
    virtual OctreeEditPacketSender* createPacketSender() { return new EntityEditPacketSender(); }

    void setEntityTree(EntityTreePointer modelTree);
    EntityTreePointer getEntityTree() { return _entityTree; }
    void setEntitiesScriptEngine(EntitiesScriptEngineProvider* engine) { _entitiesScriptEngine = engine; }

public slots:

    // returns true if the DomainServer will allow this Node/Avatar to make changes
    Q_INVOKABLE bool canAdjustLocks();

    // returns true if the DomainServer will allow this Node/Avatar to rez new entities
    Q_INVOKABLE bool canRez();

    /// adds a model with the specific properties
    Q_INVOKABLE QUuid addEntity(const EntityItemProperties& properties);

    /// gets the current model properties for a specific model
    /// this function will not find return results in script engine contexts which don't have access to models
    Q_INVOKABLE EntityItemProperties getEntityProperties(QUuid entityID);
    Q_INVOKABLE EntityItemProperties getEntityProperties(QUuid identity, EntityPropertyFlags desiredProperties);

    /// edits a model updating only the included properties, will return the identified EntityItemID in case of
    /// successful edit, if the input entityID is for an unknown model this function will have no effect
    Q_INVOKABLE QUuid editEntity(QUuid entityID, EntityItemProperties properties);

    /// deletes a model
    Q_INVOKABLE void deleteEntity(QUuid entityID);

    /// Allows a script to call a method on an entity's script. The method will execute in the entity script
    /// engine. If the entity does not have an entity script or the method does not exist, this call will have
    /// no effect.
    Q_INVOKABLE void callEntityMethod(QUuid entityID, const QString& method);

    /// finds the closest model to the center point, within the radius
    /// will return a EntityItemID.isKnownID = false if no models are in the radius
    /// this function will not find any models in script engine contexts which don't have access to models
    Q_INVOKABLE QUuid findClosestEntity(const glm::vec3& center, float radius) const;

    /// finds models within the search sphere specified by the center point and radius
    /// this function will not find any models in script engine contexts which don't have access to models
    Q_INVOKABLE QVector<QUuid> findEntities(const glm::vec3& center, float radius) const;

    /// finds models within the search sphere specified by the center point and radius
    /// this function will not find any models in script engine contexts which don't have access to models
    Q_INVOKABLE QVector<QUuid> findEntitiesInBox(const glm::vec3& corner, const glm::vec3& dimensions) const;

    /// If the scripting context has visible entities, this will determine a ray intersection, the results
    /// may be inaccurate if the engine is unable to access the visible entities, in which case result.accurate
    /// will be false.
    Q_INVOKABLE RayToEntityIntersectionResult findRayIntersection(const PickRay& ray, bool precisionPicking = false, const QScriptValue& entityIdsToInclude = QScriptValue());

    /// If the scripting context has visible entities, this will determine a ray intersection, and will block in
    /// order to return an accurate result
    Q_INVOKABLE RayToEntityIntersectionResult findRayIntersectionBlocking(const PickRay& ray, bool precisionPicking = false, const QScriptValue& entityIdsToInclude = QScriptValue());

    Q_INVOKABLE void setLightsArePickable(bool value);
    Q_INVOKABLE bool getLightsArePickable() const;

    Q_INVOKABLE void setZonesArePickable(bool value);
    Q_INVOKABLE bool getZonesArePickable() const;

    Q_INVOKABLE void setDrawZoneBoundaries(bool value);
    Q_INVOKABLE bool getDrawZoneBoundaries() const;

    Q_INVOKABLE void setSendPhysicsUpdates(bool value);
    Q_INVOKABLE bool getSendPhysicsUpdates() const;

    Q_INVOKABLE bool setVoxelSphere(QUuid entityID, const glm::vec3& center, float radius, int value);
    Q_INVOKABLE bool setVoxel(QUuid entityID, const glm::vec3& position, int value);
    Q_INVOKABLE bool setAllVoxels(QUuid entityID, int value);
    Q_INVOKABLE bool setVoxelsInCuboid(QUuid entityID, const glm::vec3& lowPosition,
                                       const glm::vec3& cuboidSize, int value);

    Q_INVOKABLE bool setAllPoints(QUuid entityID, const QVector<glm::vec3>& points);
    Q_INVOKABLE bool appendPoint(QUuid entityID, const glm::vec3& point);

    Q_INVOKABLE void dumpTree() const;

    Q_INVOKABLE QUuid addAction(const QString& actionTypeString, const QUuid& entityID, const QVariantMap& arguments);
    Q_INVOKABLE bool updateAction(const QUuid& entityID, const QUuid& actionID, const QVariantMap& arguments);
    Q_INVOKABLE bool deleteAction(const QUuid& entityID, const QUuid& actionID);
    Q_INVOKABLE QVector<QUuid> getActionIDs(const QUuid& entityID);
    Q_INVOKABLE QVariantMap getActionArguments(const QUuid& entityID, const QUuid& actionID);

    Q_INVOKABLE glm::vec3 voxelCoordsToWorldCoords(const QUuid& entityID, glm::vec3 voxelCoords);
    Q_INVOKABLE glm::vec3 worldCoordsToVoxelCoords(const QUuid& entityID, glm::vec3 worldCoords);
    Q_INVOKABLE glm::vec3 voxelCoordsToLocalCoords(const QUuid& entityID, glm::vec3 voxelCoords);
    Q_INVOKABLE glm::vec3 localCoordsToVoxelCoords(const QUuid& entityID, glm::vec3 localCoords);

signals:
    void entityCollisionWithEntity(const EntityItemID& idA, const EntityItemID& idB, const Collision& collision);
    void collisionWithEntity(const EntityItemID& idA, const EntityItemID& idB, const Collision& collision);

    void canAdjustLocksChanged(bool canAdjustLocks);
    void canRezChanged(bool canRez);

    void mousePressOnEntity(const EntityItemID& entityItemID, const MouseEvent& event);
    void mouseMoveOnEntity(const EntityItemID& entityItemID, const MouseEvent& event);
    void mouseReleaseOnEntity(const EntityItemID& entityItemID, const MouseEvent& event);

    void clickDownOnEntity(const EntityItemID& entityItemID, const MouseEvent& event);
    void holdingClickOnEntity(const EntityItemID& entityItemID, const MouseEvent& event);
    void clickReleaseOnEntity(const EntityItemID& entityItemID, const MouseEvent& event);

    void hoverEnterEntity(const EntityItemID& entityItemID, const MouseEvent& event);
    void hoverOverEntity(const EntityItemID& entityItemID, const MouseEvent& event);
    void hoverLeaveEntity(const EntityItemID& entityItemID, const MouseEvent& event);

    void enterEntity(const EntityItemID& entityItemID);
    void leaveEntity(const EntityItemID& entityItemID);

    void deletingEntity(const EntityItemID& entityID);
    void addingEntity(const EntityItemID& entityID);
    void clearingEntities();

private:
    bool actionWorker(const QUuid& entityID, std::function<bool(EntitySimulation*, EntityItemPointer)> actor);
    bool setVoxels(QUuid entityID, std::function<bool(PolyVoxEntityItem&)> actor);
    bool setPoints(QUuid entityID, std::function<bool(LineEntityItem&)> actor);
    void queueEntityMessage(PacketType packetType, EntityItemID entityID, const EntityItemProperties& properties);


    /// actually does the work of finding the ray intersection, can be called in locking mode or tryLock mode
    RayToEntityIntersectionResult findRayIntersectionWorker(const PickRay& ray, Octree::lockType lockType,
                                                            bool precisionPicking, const QVector<QUuid>& entityIdsToInclude);

    EntityTreePointer _entityTree;
    EntitiesScriptEngineProvider* _entitiesScriptEngine = nullptr;
};

#endif // hifi_EntityScriptingInterface_h