using LTGame;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Gameplay.Bullet
{
    using Gameplay.Level;
    using UnityEngine;

    public class BulletStateLockPosFly : BaseBulletState
    {

        private Vector3 _startPos;
        private Vector3 _endPos;
        private float _flyTime;

        public BulletStateLockPosFly(ViewBullet owner): base(owner, EBulletState.LockPosFly)
        {

        }

        protected override void _OnEnter(NBaseState exitState, object param)
        {
            base._OnEnter(exitState, param);

            _startPos = owner.rootObj.transform.position;
            _endPos = owner.map.TGSCellIndex2WorldPosition(owner.targetCellIndex);
            var flySpeed = owner.configData.FlySpeed;
            _flyTime = Vector3.Distance(_startPos, _endPos) / flySpeed;
        }

        protected override void _OnRunning()
        {
            base._OnRunning();

            var progress = Mathf.Clamp01(passTime / _flyTime);
            var pos = Vector3.Lerp(_startPos, _endPos, progress);
            owner.rootObj.transform.position = pos;

            if (progress >= 1)
            {
                owner.rootObj.transform.position = _endPos;
                isFinished = true;
                nextState = EBulletState.PosBoom;
            }
        }

    }
}