using System.Collections.Generic;
using Gameplay;
using Gameplay.Area;
using Gameplay.Level;
using Gameplay.Unit;
using UnityEngine;
namespace Code.Scripts.Gameplay.Unit.Data
{
    
    /// <summary>
    /// 用于储存单位的路径数据
    /// </summary>
    public class UnitPathData
    {
        public readonly GameUnit owner;
        
        public List<Vector3> pathInWorldPos = new List<Vector3>();
        public List<int> pathInCellIndex = new List<int>();
        
        public int startCellIndex
        {
            get;
            private set;
        }
        public int targetCellIndex
        {
            get;
            private set;
        }

        public UnitPathData(GameUnit owner)
        {
            this.owner = owner;
        }

        public void FindPath(int toCellIndex)
        {
            var map = LevelManager.Instance.CurrentLevel.Map;
            startCellIndex = owner.transData.cellIndex;
            targetCellIndex = toCellIndex;
            pathInCellIndex = PathFinder.FindPath(map, targetCellIndex, owner);
        }

        public void FindOrCache(int toCellIndex)
        {
            var nowCellIndex = owner.transData.cellIndex;
            if (nowCellIndex == startCellIndex && toCellIndex == targetCellIndex)
            {
                // 如果路径数据没有变化，直接返回
                return;
            }
            
            FindPath(toCellIndex);
        }

        public void GetPath(List<int> result, int toCellIndex)
        {
            result.Clear();
            var nowCellIndex = owner.transData.cellIndex;
            if (nowCellIndex == startCellIndex && toCellIndex == targetCellIndex)
            {
                // 如果路径数据没有变化，直接返回
                DebugUtil.LogG("路径数据没有变化，直接返回");
            }
            else
            {
                FindPath(toCellIndex);
            }
            result.AddRange(pathInCellIndex);
        }

        /// <summary>
        /// 用于计算路径的世界坐标, 用于显示路径
        /// </summary>
        public void CalcPathInWorldPos()
        {
            pathInWorldPos.Clear();
            for (int i = pathInCellIndex.Count - 1; i >= 0; i--)
            {
                var cellIndex = pathInCellIndex[i];
                var worldPos = AreaManager.instance.GetWorldPosByIndex(cellIndex);
                pathInWorldPos.Add(worldPos);
            }
        }
        
    }
}