using UnityEngine;
namespace Gameplay.LegionBattle.View
{
    public class FightLineStandUnit
    {
        public Vector2Int standPos;

        public int side;
        
        public int maxDistance = 3;

        private GameObject _viewObj;

        public float moveSpeed = 5;

        private Vector3 _targetPos;
        private bool _needMove;

        public bool isStandChanged;

        public bool isMainUnit;
        
        public void CreateView(GameObject sampleObj, Transform parent)
        {
            _viewObj = Object.Instantiate(sampleObj, parent);
            _viewObj.transform.localPosition = new Vector3(standPos.x, standPos.y, 0);

            var renderer = _viewObj.transform.GetChild(0).GetComponent<MeshRenderer>();
            renderer.material.color = side < 0 ? Color.red : Color.blue;
            _needMove = false;
        }

        public void LogicUpdate(float dt)
        {
            if (!_needMove) return;
            var nowPos = _viewObj.transform.position;
            var toTarget = _targetPos - nowPos;
            toTarget.z = 0;
            var distance = toTarget.magnitude;
            var moveDt = dt * moveSpeed;
            if (distance > moveDt)
            {
                var moveDir = toTarget.normalized;
                var movePos = nowPos + moveDir * moveDt;
                _viewObj.transform.position = movePos;
            }
            else
            {
                _viewObj.transform.position = _targetPos;
                _needMove = false;
            }
            
            _UpdateStandPos();
        }

        private void _UpdateStandPos()
        {
            var newStandPos = FightLineControl.GetGridPosFromWorld(_viewObj.transform.position);
            if (newStandPos != standPos)
            {
                standPos = newStandPos;
                isStandChanged = true;
            }
        }

        public void MoveTo(Vector3 targetPos)
        {
            if (isMainUnit)
            {
                DebugUtil.LogError("主单位不能移动");
                return;
            }
            _targetPos = targetPos;
            _needMove = true;
        }
    }
}