using System;
using VRage.Game;
using VRageMath;

namespace Sandbox.ModAPI.Ingame
{
    public enum MyDetectedEntityType
    {
        None = 0,
        Unknown,
        SmallGrid,
        LargeGrid,
        CharacterHuman,
        CharacterOther,
        FloatingObject,
        Asteroid,
        Planet,
        Meteor,
        Missile,
    }

    public struct MyDetectedEntityInfo
    {
        public MyDetectedEntityInfo(long entityId, string name, MyDetectedEntityType type, Vector3D? hitPosition, MatrixD orientation, Vector3 velocity, MyRelationsBetweenPlayerAndBlock relationship, BoundingBoxD boundingBox, long timeStamp)
        {
            if (timeStamp <= 0)
                throw new ArgumentException("Invalid Timestamp", "timeStamp");
            EntityId = entityId;
            Name = name;
            Type = type;
            HitPosition = hitPosition;
            Orientation = orientation;
            Velocity = velocity;
            Relationship = relationship;
            BoundingBox = boundingBox;
            TimeStamp = timeStamp;
        }

        /// <summary>
        /// The entity's EntityId
        /// </summary>
        public readonly long EntityId;

        /// <summary>
        /// The entity's display name if it is friendly, or a generic descriptor if it is not
        /// </summary>
        public readonly string Name;

        /// <summary>
        /// Enum describing the type of entity
        /// </summary>
        public readonly MyDetectedEntityType Type;

        /// <summary>
        /// Position where the raycast hit the entity. (can be null if the sensor didn't use a raycast)
        /// </summary>
        public readonly Vector3D? HitPosition;

        /// <summary>
        /// The entity's absolute orientation at the time it was detected
        /// </summary>
        public readonly MatrixD Orientation;

        /// <summary>
        /// The entity's absolute velocity at the time it was detected
        /// </summary>
        public readonly Vector3 Velocity;

        /// <summary>
        /// Relationship between the entity and the owner of the sensor
        /// </summary>
        public readonly MyRelationsBetweenPlayerAndBlock Relationship;

        /// <summary>
        /// The entity's world-aligned bounding box
        /// </summary>
        public readonly BoundingBoxD BoundingBox;

        /// <summary>
        /// Time when the entity was detected. This field counts milliseconds, compensated for simspeed
        /// </summary>
        public readonly long TimeStamp;

        /// <summary>
        /// The entity's position (center of the Bounding Box)
        /// </summary>
        public Vector3D Position
        {
            get { return BoundingBox.Center; }
        }

        /// <summary>
        /// Determines if this structure is empty; meaning it does not contain any meaningful data
        /// </summary>
        /// <returns></returns>
        public bool IsEmpty()
        {
            return TimeStamp == 0;
        }
    }
}