//
//  Created by Sam Gondelman 10/20/2017
//  Copyright 2017 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
//
#ifndef hifi_PointerScriptingInterface_h
#define hifi_PointerScriptingInterface_h

#include <QtCore/QObject>

#include "DependencyManager.h"
#include <PointerManager.h>
#include <Pick.h>

/**jsdoc
 * The Pointers API lets you create and manage objects for repeatedly calculating intersections in different ways, as well as the visual representation of those objects.
 *  Pointers can also be configured to automatically generate {@link PointerEvent}s on {@link Entities}.
 *
 * @namespace Pointers
 *
 * @hifi-interface
 * @hifi-client-entity
 * @hifi-avatar
 */

class PointerScriptingInterface : public QObject, public Dependency {
    Q_OBJECT
    SINGLETON_DEPENDENCY

public:
    unsigned int createLaserPointer(const QVariant& properties) const;
    unsigned int createStylus(const QVariant& properties) const;
    unsigned int createParabolaPointer(const QVariant& properties) const;

    /**jsdoc
    * A trigger mechanism for Ray and Parabola Pointers.
    *
    * @typedef {object} Pointers.Trigger
    * @property {Controller.Standard|Controller.Actions|function} action This can be a built-in Controller action, like Controller.Standard.LTClick, or a function that evaluates to >= 1.0 when you want to trigger <code>button</code>.
    * @property {string} button Which button to trigger.  "Primary", "Secondary", "Tertiary", and "Focus" are currently supported.  Only "Primary" will trigger clicks on web surfaces.  If "Focus" is triggered,
    * it will try to set the entity focus to the object at which the Pointer is aimed.  Buttons besides the first three will still trigger events, but event.button will be "None".
    */

    /**jsdoc
     * Adds a new Pointer
     * Different {@link PickType}s use different properties, and within one PickType, the properties you choose can lead to a wide range of behaviors.  For example,
     *   with PickType.Ray, depending on which optional parameters you pass, you could create a Static Ray Pointer, a Mouse Ray Pointer, or a Joint Ray Pointer.
     * Pointers created with this method always intersect at least visible and collidable things
     * @function Pointers.createPointer
     * @param {PickType} type A PickType that specifies the method of picking to use. Cannot be {@link PickType|PickType.Collision}.
     * @param {Pointers.LaserPointerProperties|Pointers.StylusPointerProperties|Pointers.ParabolaPointerProperties} properties A PointerProperties object, containing all the properties for initializing this Pointer <b>and</b> the {@link Picks.PickProperties} for the Pick that
     *   this Pointer will use to do its picking.
     * @returns {number} The ID of the created Pointer.  Used for managing the Pointer.  0 if invalid.
     *
     * @example <caption>Create a left hand Ray Pointer that triggers events on left controller trigger click and changes color when it's intersecting something.</caption>
     *
     * var end = {
     *     type: "sphere",
     *     dimensions: {x:0.5, y:0.5, z:0.5},
     *     solid: true,
     *     color: {red:0, green:255, blue:0},
     *     ignorePickIntersection: true
     * };
     * var end2 = {
     *     type: "sphere",
     *     dimensions: {x:0.5, y:0.5, z:0.5},
     *     solid: true,
     *     color: {red:255, green:0, blue:0},
     *     ignorePickIntersection: true
     * };
     *
     * var renderStates = [ {name: "test", end: end} ];
     * var defaultRenderStates = [ {name: "test", distance: 10.0, end: end2} ];
     * var pointer = Pointers.createPointer(PickType.Ray, {
     *     joint: "_CAMERA_RELATIVE_CONTROLLER_LEFTHAND",
     *     filter: Picks.PICK_LOCAL_ENTITIES | Picks.PICK_DOMAIN_ENTITIES | Picks.PICK_INCLUDE_NONCOLLIDABLE,
     *     renderStates: renderStates,
     *     defaultRenderStates: defaultRenderStates,
     *     distanceScaleEnd: true,
     *     triggers: [ {action: Controller.Standard.LTClick, button: "Focus"}, {action: Controller.Standard.LTClick, button: "Primary"} ],
     *     hover: true,
     *     enabled: true
     * });
     * Pointers.setRenderState(pointer, "test");
     */
    // TODO: expand Pointers to be able to be fully configurable with PickFilters
    Q_INVOKABLE unsigned int createPointer(const PickQuery::PickType& type, const QVariant& properties);

    /**jsdoc
     * Enables a Pointer.
     * @function Pointers.enablePointer
     * @param {number} uid The ID of the Pointer, as returned by {@link Pointers.createPointer}.
     */
    Q_INVOKABLE void enablePointer(unsigned int uid) const { DependencyManager::get<PointerManager>()->enablePointer(uid); }

    /**jsdoc
     * Disables a Pointer.
     * @function Pointers.disablePointer
     * @param {number} uid The ID of the Pointer, as returned by {@link Pointers.createPointer}.
     */
    Q_INVOKABLE void disablePointer(unsigned int uid) const { DependencyManager::get<PointerManager>()->disablePointer(uid); }

    /**jsdoc
     * Removes a Pointer.
     * @function Pointers.removePointer
     * @param {number} uid The ID of the Pointer, as returned by {@link Pointers.createPointer}.
     */
    Q_INVOKABLE void removePointer(unsigned int uid) const { DependencyManager::get<PointerManager>()->removePointer(uid); }

    /**jsdoc
     * Edit some visual aspect of a Pointer.  Currently only supported for Ray Pointers.
     * @function Pointers.editRenderState
     * @param {number} uid The ID of the Pointer, as returned by {@link Pointers.createPointer}.
     * @param {string} renderState The name of the render state you want to edit.
     * @param {Pointers.RayPointerRenderState} properties The new properties for <code>renderStates</code> item.
     */
    Q_INVOKABLE void editRenderState(unsigned int uid, const QString& renderState, const QVariant& properties) const;

    /**jsdoc
     * Set the render state of a Pointer.  For Ray Pointers, this means switching between their {@link Pointers.RayPointerRenderState}s, or "" to turn off rendering and hover/trigger events.
     *  For Stylus Pointers, there are three built-in options: "events on" (render and send events, the default), "events off" (render but don't send events), and "disabled" (don't render, don't send events).
     * @function Pointers.setRenderState
     * @param {number} uid The ID of the Pointer, as returned by {@link Pointers.createPointer}.
     * @param {string} renderState The name of the render state to which you want to switch.
     */
    Q_INVOKABLE void setRenderState(unsigned int uid, const QString& renderState) const { DependencyManager::get<PointerManager>()->setRenderState(uid, renderState.toStdString()); }


    /**jsdoc
     * Get the most recent pick result from this Pointer.  This will be updated as long as the Pointer is enabled, regardless of the render state.
     * @function Pointers.getPrevPickResult
     * @param {number} uid The ID of the Pointer, as returned by {@link Pointers.createPointer}.
     * @returns {RayPickResult|StylusPickResult} The most recent intersection result.  This will be slightly different for different PickTypes.
     */
    Q_INVOKABLE QVariantMap getPrevPickResult(unsigned int uid) const;


    /**jsdoc
     * Sets whether or not to use precision picking.
     * @function Pointers.setPrecisionPicking
     * @param {number} uid The ID of the Pointer, as returned by {@link Pointers.createPointer}.
     * @param {boolean} precisionPicking Whether or not to use precision picking
     */
    Q_INVOKABLE void setPrecisionPicking(unsigned int uid, bool precisionPicking) const { DependencyManager::get<PointerManager>()->setPrecisionPicking(uid, precisionPicking); }

    /**jsdoc
     * Sets the length of this Pointer.  No effect on Stylus Pointers.
     * @function Pointers.setLength
     * @param {number} uid The ID of the Pointer, as returned by {@link Pointers.createPointer}.
     * @param {number} length The desired length of the Pointer.
     */
    Q_INVOKABLE void setLength(unsigned int uid, float length) const { DependencyManager::get<PointerManager>()->setLength(uid, length); }

    /**jsdoc
     * Sets a list of Entity IDs and/or Avatar IDs to ignore during intersection.  Not used by Stylus Pointers.
     * @function Pointers.setIgnoreItems
     * @param {number} uid The ID of the Pointer, as returned by {@link Pointers.createPointer}.
     * @param {Uuid[]} ignoreItems A list of IDs to ignore.
     */
    Q_INVOKABLE void setIgnoreItems(unsigned int uid, const QScriptValue& ignoreEntities) const;

    /**jsdoc
     * Sets a list of Entity IDs and/or Avatar IDs to include during intersection, instead of intersecting with everything.  Stylus
     *   Pointers <b>only</b> intersect with objects in their include list.
     * @function Pointers.setIncludeItems
     * @param {number} uid The ID of the Pointer, as returned by {@link Pointers.createPointer}.
     * @param {Uuid[]} includeItems A list of IDs to include.
     */
    Q_INVOKABLE void setIncludeItems(unsigned int uid, const QScriptValue& includeEntities) const;


    /**jsdoc
     * Lock a Pointer onto a specific object (entity or avatar).  Optionally, provide an offset in object-space, otherwise the Pointer will lock on to the center of the object.
     *   Not used by Stylus Pointers.
     * @function Pointers.setLockEndUUID
     * @param {number} uid The ID of the Pointer, as returned by {@link Pointers.createPointer}.
     * @param {Uuid} objectID The ID of the object to which to lock on.
     * @param {boolean} isAvatar False for entities, true for avatars
     * @param {Mat4} [offsetMat] The offset matrix to use if you do not want to lock on to the center of the object.
     */
    Q_INVOKABLE void setLockEndUUID(unsigned int uid, const QUuid& objectID, bool isAvatar, const glm::mat4& offsetMat = glm::mat4()) const { DependencyManager::get<PointerManager>()->setLockEndUUID(uid, objectID, isAvatar, offsetMat); }


    /**jsdoc
     * Check if a Pointer is associated with the left hand.
     * @function Pointers.isLeftHand
     * @param {number} uid The ID of the Pointer, as returned by {@link Pointers.createPointer}.
     * @returns {boolean} True if the Pointer is a Joint Ray Pointer with joint == "_CONTROLLER_LEFTHAND" or "_CAMERA_RELATIVE_CONTROLLER_LEFTHAND", or a Stylus Pointer with hand == 0
     */
    Q_INVOKABLE bool isLeftHand(unsigned int uid) { return DependencyManager::get<PointerManager>()->isLeftHand(uid); }

    /**jsdoc
     * Check if a Pointer is associated with the right hand.
     * @function Pointers.isRightHand
     * @param {number} uid The ID of the Pointer, as returned by {@link Pointers.createPointer}.
     * @returns {boolean} True if the Pointer is a Joint Ray Pointer with joint == "_CONTROLLER_RIGHTHAND" or "_CAMERA_RELATIVE_CONTROLLER_RIGHTHAND", or a Stylus Pointer with hand == 1
     */
    Q_INVOKABLE bool isRightHand(unsigned int uid) { return DependencyManager::get<PointerManager>()->isRightHand(uid); }

    /**jsdoc
     * Check if a Pointer is associated with the system mouse.
     * @function Pointers.isMouse
     * @param {number} uid The ID of the Pointer, as returned by {@link Pointers.createPointer}.
     * @returns {boolean} True if the Pointer is a Mouse Ray Pointer, false otherwise.
     */
    Q_INVOKABLE bool isMouse(unsigned int uid) { return DependencyManager::get<PointerManager>()->isMouse(uid); }

    /**jsdoc
     * Returns information about an existing Pointer
     * @function Pointers.getPointerProperties
     * @param {number} uid The ID of the Pointer, as returned by {@link Pointers.createPointer}.
     * @returns {Pointers.LaserPointerProperties|Pointers.StylusPointerProperties|Pointers.ParabolaPointerProperties} The information about the Pointer.
     * Currently only includes renderStates and defaultRenderStates with associated entity IDs.
     */
    Q_INVOKABLE QVariantMap getPointerProperties(unsigned int uid) const;
};

#endif // hifi_PointerScriptingInterface_h