using UnityEngine;

public enum EntityTag : uint
{
    Character, Player, Enemy, Mate, Skill, PlayerBaseCamp,
}

public class Entity : MonoBehaviour
{
    [SerializeField] Transform centerPivot;

    public Bitset32 Tags { get; private set; } = 0;
    public Vector2 LookDirection { get; private set; }
    public Vector2 Position { get => transform.position; set => transform.position = new Vector3(value.x, value.y, transform.position.z); }
    public Transform CenterPivotTransform => centerPivot != null ? centerPivot : transform;
    public Vector2 CenterPivot => centerPivot != null ? Position + (centerPivot.localPosition * LookDirection) : Position;

    public void AddTags(params EntityTag[] tag)
    {
        for (int i = 0; i < tag.Length; i++)
            Tags.SetBit((int)tag[i], true);
    }

    public void RemoveTags(params EntityTag[] tag)
    {
        for (int i = 0; i < tag.Length; i++)
            Tags.SetBit((int)tag[i], false);
    }

    public void ClearTags() => Tags.Reset();

    public bool HasTagsAny(Bitset32 targetTags) => Tags.MatchAny(targetTags);
    public bool HasTagsAny(Bitset32.Mask targetTags) => Tags.MatchAny(targetTags);
    public bool HasTagsAny(params EntityTag[] targetTags)
    {
        for (int i = 0; i < targetTags.Length; i++)
        {
            if (Tags.GetBit((int)targetTags[i]))
                return true;
        }

        return false;
    }

    public bool HasTagsAll(Bitset32 targetTags) => Tags.MatchAll(targetTags);
    public bool HasTagsAll(Bitset32.Mask targetTags) => Tags.MatchAll(targetTags);
    public bool HasTagsAll(params EntityTag[] targetTags)
    {
        for (int i = 0; i < targetTags.Length; i++)
        {
            if (!Tags.GetBit(i))
                return false;
        }

        return true;
    }

    public void SetPosWithCenterPivot(Vector2 position)
    {
        Vector3 newPos = position;
        newPos.z = transform.position.z;

        if(centerPivot != null)
            transform.position = position - CenterPivot + Position;
        
        transform.position = newPos;

        LookDirection = Vector2.right;
    }

    public void ChangeLookDirection(Transform lookTarget)
    {
        ChangeLookDirection((Vector2)lookTarget.position - Position);
    }

    public void ChangeLookDirection(Vector2 lookDirection)
    {
        if (lookDirection.x > 0)
        {
            LookDirection = Vector2.right;
            transform.rotation = Quaternion.Euler(Vector3.zero);
        }
        else if(lookDirection.x < 0)
        {
            LookDirection = Vector2.left;
            transform.rotation = Quaternion.Euler(Global.V3_RotRev);
        }
    }
}