using System.Collections.Generic;
using UnityEngine;
namespace Gameplay.LegionBattle.View
{
    public class FightLineMap
    {
        private FightLineCell[,] _cellMap;

        public FightLineMap(int xCount,
            int yCount)
        {
            _cellMap = new FightLineCell[xCount, yCount];
            for (int i = 0; i < xCount; i++)
            {
                for (int j = 0; j < yCount; j++)
                {
                    _cellMap[i, j] = new FightLineCell(i, j);
                }
            }

            // build neighbors
            for (int i = 0; i < xCount; i++)
            {
                for (int j = 0; j < yCount; j++)
                {
                    _cellMap[i, j].BuildNeighbors(_cellMap);
                }
            }
        }

        public void FillStartWeights()
        {
            // x<20 -1， x>20 1
            for (int i = 0; i < _cellMap.GetLength(0); i++)
            {
                for (int j = 0; j < _cellMap.GetLength(1); j++)
                {
                    var cell = _cellMap[i, j];
                    if (cell.pos.x < 20)
                    {
                        cell.standValue = -1;
                    }
                    else
                    {
                        cell.standValue = 1;
                    }
                }
            }
        }

        public void CreateViewMap(GameObject sampleObj,
            Transform parent)
        {
            // 遍历_cellMap创建view
            for (int i = 0; i < _cellMap.GetLength(0); i++)
            {
                for (int j = 0; j < _cellMap.GetLength(1); j++)
                {
                    var cell = _cellMap[i, j];
                    var obj = Object.Instantiate(sampleObj, parent);
                    obj.transform.position = new Vector3(cell.pos.x, cell.pos.y, 0);
                    obj.name = $"Cell_pos_{cell.pos.x}_{cell.pos.y}";
                    cell.BindViewObj(obj);
                }
            }
        }

        public void UpdateColors()
        {
            for (int i = 0; i < _cellMap.GetLength(0); i++)
            {
                for (int j = 0; j < _cellMap.GetLength(1); j++)
                {
                    var cell = _cellMap[i, j];
                    cell.UpdateColor();
                }
            }
        }

        public void ReverseTuDian()
        {
            ForEachCell(cell =>
            {
                if (cell.CheckIsTuDian())
                {
                    cell.standValue = -cell.standValue;
                }
            });
        }

        public void ReverseAloneArea()
        {
            FightLineArea mainLeft = null;
            FightLineArea mainRight = null;
            for (int i = 0; i < _areaList.Count; i++)
            {
                var area = _areaList[i];
                if (area.isMainArea)
                {
                    if (area.cellList[0].standValue == -1)
                    {
                        mainLeft = area;
                    }
                    else if (area.cellList[0].standValue == 1)
                    {
                        mainRight = area;
                    }
                    continue;
                }
                area.ReverseArea();
            }
            
            if (mainLeft == null || mainRight == null)
            {
                Debug.LogError("不存在主区域");
                return;
            }

            for (int i = 0; i < _areaList.Count; i++)
            {
                var area = _areaList[i];
                if (area.isMainArea)
                {
                    continue;
                }
                if (area.cellList[0].standValue == -1)
                {
                    mainLeft.AddArea(area);
                }
                else if (area.cellList[0].standValue == 1)
                {
                    mainRight.AddArea(area);
                }
            }
            
            leftArea.ResetArea(mainLeft);
            rightArea.ResetArea(mainRight);
        }

        private List<FightLineArea> _areaList = new List<FightLineArea>();
        public FightLineArea leftArea = new FightLineArea();
        public FightLineArea rightArea = new FightLineArea();
        
        public void UpdateAreas()
        {
            _areaList.Clear();
            
            for (int i = 0; i < _cellMap.GetLength(0); i++)
            {
                for (int j = 0; j < _cellMap.GetLength(1); j++)
                {
                    var cell = _cellMap[i, j];
                    cell.isVisited = false;
                }
            }

            var workList = new Queue<FightLineCell>();
            var firstCell = _SearchNoFinishCell();
            workList.Enqueue(firstCell);
            firstCell.isVisited = true;
            var workArea = new FightLineArea();
            _areaList.Add(workArea);
            while (workList.Count > 0)
            {
                var workCell = workList.Dequeue();
                workArea.AddCell(workCell);

                var aroundNeighbors = workCell.fullNeighbors;
                var fullNeighborCount = aroundNeighbors.Count;
                for (int i = 0; i < fullNeighborCount; i++)
                {
                    var neighbor = aroundNeighbors[i];
                    if (neighbor.isVisited) continue;
                    if (neighbor.standValue != workCell.standValue)
                        continue;
                    workList.Enqueue(neighbor);
                    neighbor.isVisited = true;
                }

                if (workList.Count == 0)
                {
                    // 区域完结
                    var nextCell = _SearchNoFinishCell();
                    if (nextCell != null)
                    {
                        workList.Enqueue(nextCell);
                        nextCell.isVisited = true;
                        workArea = new FightLineArea();
                        _areaList.Add(workArea);
                    }
                }
            }
        }

        private FightLineCell _SearchNoFinishCell()
        {
            for (int i = 0; i < _cellMap.GetLength(0); i++)
            {
                for (int j = 0; j < _cellMap.GetLength(1); j++)
                {
                    var cell = _cellMap[i, j];
                    if (!cell.isVisited)
                    {
                        return cell;
                    }
                }
            }
            return null;
        }

        public void ForEachCell(System.Action<FightLineCell> action)
        {
            for (int i = 0; i < _cellMap.GetLength(0); i++)
            {
                for (int j = 0; j < _cellMap.GetLength(1); j++)
                {
                    var cell = _cellMap[i, j];
                    action(cell);
                }
            }
        }

        public FightLineCell GetCellByGridPos(Vector2Int gridPos)
        {
            return GetCellByGridPos(gridPos.x, gridPos.y);
        }

        public FightLineCell GetCellByGridPos(int x,
            int y)
        {
            if (x < 0 || x >= _cellMap.GetLength(0) ||
                y < 0 || y >= _cellMap.GetLength(1))
            {
                return null;
            }
            else
            {
                return _cellMap[x, y];
            }
        }

        public List<FightLineCell> leftBoardCells = new List<FightLineCell>();
        public List<FightLineCell> rightBoardCells = new List<FightLineCell>();

        public void UpdateLineBoard()
        {
            
            leftBoardCells.Clear();
            rightBoardCells.Clear();

            // 遍历整个棋盘
            for (int i = 0; i < _cellMap.GetLength(0); i++)
            {
                for (int j = 0; j < _cellMap.GetLength(1); j++)
                {
                    var cell = _cellMap[i, j];
                    if (cell.standValue < 0)
                    {
                        leftBoardCells.Add(cell);
                    }
                    else if (cell.standValue > 0)
                    {
                        rightBoardCells.Add(cell);
                    }
                }
            }

            // 遍历左边的cell
            for (int i = 0; i < leftBoardCells.Count; i++)
            {
                var cell = leftBoardCells[i];
                if (cell.CheckIsCenter())
                {
                    leftBoardCells.RemoveAt(i);
                    i--;
                }
            }

            // 遍历右边的cell
            for (int i = 0; i < rightBoardCells.Count; i++)
            {
                var cell = rightBoardCells[i];
                if (cell.CheckIsCenter())
                {
                    rightBoardCells.RemoveAt(i);
                    i--;
                }
            }
        }

        public List<FightLine> CalcLines(List<FightLineCell> boardCells,
            List<FightLine> result)
        {
            while (boardCells.Count > 0)
            {
                var workCell = boardCells[0];
                boardCells.RemoveAt(0);
                var line = new FightLine();
                line.AddCell(workCell);
                result.Add(line);
                while (workCell != null)
                {
                    var neighbors = workCell.neighbors;
                    var isFind = false;
                    for (int i = 0; i < neighbors.Count; i++)
                    {
                        var neighbor = neighbors[i];
                        if (neighbor.standValue == workCell.standValue
                            && boardCells.Contains(neighbor))
                        {
                            boardCells.Remove(neighbor);
                            line.AddCell(neighbor);
                            workCell = neighbor;
                            isFind = true;
                            break;
                        }
                    }
                    if (!isFind)
                    {
                        break;
                    }
                }
            }

            for (int i = 0; i < result.Count; i++)
            {
                var line = result[i];
                var lineHead = line.cells[0];
                var lineEnd = line.cells[^1];
                for (int j = i + 1; j < result.Count; j++)
                {
                    var line2 = result[j];
                    var line2Head = line2.cells[0];
                    var line2End = line2.cells[^1];

                    var isConnect = true;
                    if (lineHead.CheckIsConnect(line2Head))
                    {
                        // 头头相接
                        // 先把1反转,再把2加入
                        line.Reverse();
                        line.AddLine(line2);
                        lineHead = line.cells[0];
                        lineEnd = line.cells[^1];
                    }
                    else if (lineHead.CheckIsConnect(line2End))
                    {
                        // 头尾相接
                        // 把2反转, 再把2加入
                        line2.Reverse();
                        line.AddLine(line2);
                        lineEnd = line.cells[^1];
                    }
                    else if (lineEnd.CheckIsConnect(lineHead))
                    {
                        // 尾头相接
                        // 把2加入
                        line.AddLine(line2);
                        lineEnd = line.cells[^1];
                    }
                    else if (lineEnd.CheckIsConnect(line2End))
                    {
                        // 尾尾相接
                        // 先把2反转, 再把2加入
                        line2.Reverse();
                        line.AddLine(line2);
                        lineEnd = line.cells[^1];
                    }
                    else
                    {
                        isConnect = false;
                    }
                    if (isConnect)
                    {
                        result.RemoveAt(j);
                        j--;
                    }
                }
            }

            return result;
        }

    }
}