#ifndef OPENMW_MWPHYSICS_RAYCASTING_H
#define OPENMW_MWPHYSICS_RAYCASTING_H

#include <osg/Vec3f>

#include "../mwworld/ptr.hpp"

#include "collisiontype.hpp"

namespace MWPhysics
{
    class RayCastingResult
    {
    public:
        bool mHit;
        osg::Vec3f mHitPos;
        osg::Vec3f mHitNormal;
        MWWorld::Ptr mHitObject;
    };

    class RayCastingInterface
    {
    public:
        virtual ~RayCastingInterface() = default;

        /// Get distance from \a point to the collision shape of \a target. Uses a raycast to find where the
        /// target vector hits the collision shape and then calculates distance from the intersection point.
        /// This can be used to find out how much nearer we need to move to the target for a "getHitContact" to be
        /// successful. \note Only Actor targets are supported at the moment.
        virtual float getHitDistance(const osg::Vec3f& point, const MWWorld::ConstPtr& target) const = 0;

        /// @param me Optional, a Ptr to ignore in the list of results. targets are actors to filter for, ignoring all
        /// other actors.
        virtual RayCastingResult castRay(const osg::Vec3f& from, const osg::Vec3f& to,
            const MWWorld::ConstPtr& ignore = MWWorld::ConstPtr(),
            const std::vector<MWWorld::Ptr>& targets = std::vector<MWWorld::Ptr>(), int mask = CollisionType_Default,
            int group = 0xff) const = 0;

        RayCastingResult castRay(const osg::Vec3f& from, const osg::Vec3f& to, int mask) const
        {
            return castRay(from, to, MWWorld::ConstPtr(), std::vector<MWWorld::Ptr>(), mask);
        }

        virtual RayCastingResult castSphere(const osg::Vec3f& from, const osg::Vec3f& to, float radius,
            int mask = CollisionType_Default, int group = 0xff) const = 0;

        /// Return true if actor1 can see actor2.
        virtual bool getLineOfSight(const MWWorld::ConstPtr& actor1, const MWWorld::ConstPtr& actor2) const = 0;
    };
}

#endif