using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Splines;
namespace Gameplay.LegionBattle.View
{
    public class FightLine
    {

        public int side;

        public List<FightLineCell> cells = new List<FightLineCell>();

        private FightLineCell _workCell;

        public FightLine()
        {

        }

        public void AddCell(FightLineCell cell)
        {
            cells.Add(cell);
            _workCell = cell;
        }

        public FightLineCell SearchNext(List<FightLineCell> remainCellList, out int outIndex)
        {
            var minDistance = float.MaxValue;
            FightLineCell selectCell = null;
            int selectIndex = -1;
            var neighbors = _workCell.fullNeighbors;
            for (int i = 0; i < neighbors.Count; i++)
            {
                var nCell = neighbors[i];
                if (nCell.standValue != _workCell.standValue)
                {
                    continue;
                }
                var indexOfCell = remainCellList.IndexOf(nCell);
                if (indexOfCell < 0)
                {
                    continue;
                }
                var nowDistance = Vector3.Distance(_workCell.boardPos, nCell.boardPos);
                if (nowDistance < minDistance)
                {
                    minDistance = nowDistance;
                    selectCell = nCell;
                    selectIndex = indexOfCell;
                }
            }

            outIndex = selectIndex;
            return selectCell;
        }

        public void Reverse()
        {
            // 反转
            cells.Reverse();
        }

        public void AddLine(FightLine nLine)
        {
            nLine.cells.AddRange(nLine.cells);
        }

        public void Clear()
        {
            cells.Clear();
        }

        public void UpdateSpline(Spline spLine)
        {
            spLine.Closed = true;
            spLine.Clear();
            var workCell = cells[0];
            spLine.Add(workCell.boardPos, TangentMode.Linear);
            for (int i = 1; i < cells.Count; i++)
            {
                var checkCell = cells[i];
                var nextIndex = i + 1;
                if (nextIndex >= cells.Count)
                {
                    nextIndex = 0;
                }
                var nextCell = cells[nextIndex];
                var workToCheck = checkCell.boardPos - workCell.boardPos;
                var checkToNext = nextCell.boardPos - checkCell.boardPos;
                var angle = Vector3.Angle(workToCheck, checkToNext);
                if (angle > 5)
                {
                    // 是关键点
                    spLine.Add(checkCell.boardPos, TangentMode.Linear);
                }
                workCell = checkCell;
            }
            
        }

    }
}