using cfg.CampCfg;
using Framework;
using Gameplay.Building.Impl;
using PhxhSDK;
using System.Collections.Generic;
using TGS;
using UnityEngine;
using UnityEngine.InputSystem;
using UnityEngine.Rendering;

namespace Gameplay.Camp
{
    public sealed partial class Camp
    {
        /// <summary>
        /// 射线检测点列表
        /// </summary>
        private RaycastHit[] hits;
        /// <summary>
        /// 编辑模式下地板状态
        /// </summary>
        private Dictionary<int, E_CampCellState> dicEditCellState;
        /// <summary>
        /// 修改过的地板颜色集合
        /// </summary>
        private HashSet<Cell> setCellDrag;
        /// <summary>
        /// 当前拖动的建筑单位
        /// </summary>
        private BuildingCampUnit buildingCampUnit;
        /// <summary>
        /// 是否拖动状态
        /// </summary>
        private bool isDrag;

        /// <summary>
        /// 编辑模式下未保存的营地单位集合
        /// </summary>
        public HashSet<CampUnitBase> SetEditUnit { get; private set; }

        /// <summary>
        /// 编辑状态
        /// </summary>
        public bool IsEdit { get; private set; }

        /// <summary>
        /// 是否拖动状态
        /// </summary>
        public bool IsDrag { get; private set; }

        private void InitEdit()
        {
            hits = new RaycastHit[1];
            dicEditCellState = new Dictionary<int, E_CampCellState>();
            SetEditUnit = new HashSet<CampUnitBase>();
            setCellDrag = new HashSet<Cell>();

            IsEdit = false;
        }

        /// <summary>
        /// 进入编辑模式
        /// </summary>
        public void SetInfoByEdit()
        {
            setCellDrag.Clear();

            foreach (var kv in dicCellState)
            {
                dicEditCellState[kv.Key] = kv.Value;
            }

            #region 设置格子颜色
            foreach (Cell cell in GridSystem.cells)
            {
                if (!TryGetCellStateByIndex(cell.index, out E_CampCellState cellState))
                    continue;

                SetCellColorByCellState(cell, cellState);
            }
            #endregion

            IsShowAllGrid = true;

            IsEdit = true;
        }

        public void UpdateEdit()
        {
            if (!IsDrag)
                return;

            ClearDragCell(); // 还原拖动的格子
            SetDragCell();
        }

        /// <summary>
        /// 退出编辑模式
        /// </summary>
        public void ExitEdit()
        {
            if (!IsEdit)
                return;

            IsShowAllGrid = false;

            dicEditCellState.Clear();

            foreach (CampUnitBase unit in SetEditUnit)
            {
                unit.Dispose();
            }
            SetEditUnit.Clear();

            if (null != buildingCampUnit)
            {
                buildingCampUnit.Dispose();
                buildingCampUnit = null;
            }

            setCellDrag.Clear();

            IsDrag = false;
            IsEdit = false;
        }

        /// <summary>
        /// 进入拖动状态
        /// </summary>
        public async void EnterDrag(DataCampObject dataCampObject)
        {
            if (IsDrag)
                return;

            GameObject goCampObject = await LoadCampObject(dataCampObject.Path);
            buildingCampUnit = new(goCampObject, dataCampObject);

            IsDrag = true;
        }

        public void ExitDrag()
        {
            if (!IsDrag)
                return;

            IsDrag = false;

            if (!EditCheckPlace(buildingCampUnit.CellIndex, buildingCampUnit.Cfg.ListPosOffset))
            {
                UITipsManager.ShowTips("该位置不能放置");
                buildingCampUnit.Dispose();
            }
            else
                EditPlaceCampItem();

            buildingCampUnit = null;

            ClearDragCell();
        }

        /// <summary>
        /// 保存单位
        /// </summary>
        public void SaveCampUnit(CampUnitBase campUnitBase)
        {
            if (campUnitBase is not BuildingCampUnit buildingUnit)
                return;

            if (!SetEditUnit.Remove(campUnitBase))
                return;

            setUnit.Remove(campUnitBase);

            EventManager.Instance.Send(EventManager.EventName.Camp_EditRemoveUnit);

            // TODO 向服务器发送保存数据

            PlaceCampItem(buildingUnit);
        }

        /// <summary>
        /// 移除未保存的营地单位
        /// </summary>
        public void RemoveCampUnit(CampUnitBase campUnitBase)
        {
            if (campUnitBase is not BuildingCampUnit buildingUnit)
                return;

            if (!SetEditUnit.Remove(campUnitBase))
                return;

            setUnit.Remove(campUnitBase);

            EventManager.Instance.Send(EventManager.EventName.Camp_EditRemoveUnit);

            #region 设置编辑模式营地地板状态
            if (!dicCellByIndex.TryGetValue(buildingUnit.CellIndex, out Cell centerCell))
                return;

            foreach (Vector2 offset in buildingUnit.Cfg.ListPosOffset)
            {
                Vector2Int gridPos = GetCellPosByOffset(new Vector2Int(centerCell.row, centerCell.column), offset); // 计算格子位置
                if (!dicCellByRowCol.TryGetValue(gridPos, out Cell cell))
                    continue;

                dicEditCellState[cell.index] = E_CampCellState.Empty;
                dicCellState[cell.index] = E_CampCellState.Empty;

                SetCellColorByCellState(cell, E_CampCellState.Empty);
            }
            #endregion

            campUnitBase.Dispose();
        }

        /// <summary>
        /// 编辑模式下点击
        /// </summary>
        /// <param name="screenPos"></param>
        public void OnEditClick(Vector2 screenPos)
        {
            int cellIndex = GroundHitHelper.CalcHitCellIndex(screenPos, GridSystem);
            if (!TryGetPlaceUnit(cellIndex, out CampUnitBase campUnit))
                return;

            if (campUnit is not BuildingCampUnit buildingCampUnit)
                return;

            // TODO 已放置保存建筑转到未保存状态
            #region 还原营地地板为空状态
            if (!dicCellByIndex.TryGetValue(buildingCampUnit.CellIndex, out Cell centerCell))
                return;

            foreach (Vector2 offset in buildingCampUnit.Cfg.ListPosOffset)
            {
                Vector2Int gridPos = GetCellPosByOffset(new Vector2Int(centerCell.row, centerCell.column), offset); // 计算格子位置
                if (!dicCellByRowCol.TryGetValue(gridPos, out Cell cell))
                    continue;

                dicCellState[cell.index] = E_CampCellState.Empty;
                dicUnit.Remove(cell.index);
            }
            #endregion

            SetEditUnit.Add(campUnit);
            EventManager.Instance.Send(EventManager.EventName.Camp_EditPlaceUnit);
        }

        #region 私有方法
        /// <summary>
        /// 清除拖动的格子
        /// </summary>
        private void ClearDragCell()
        {
            foreach (Cell cell in setCellDrag)
            {
                if (dicEditCellState.TryGetValue(cell.index, out E_CampCellState cellState))
                    SetCellColorByCellState(cell, cellState);
            }

            setCellDrag.Clear();
        }

        /// <summary>
        /// 设置拖动建筑影响的格子
        /// </summary>
        private void SetDragCell()
        {
            Vector2 mousePos = Mouse.current.position.ReadValue();
            // 发射射线
            Ray ray = CameraManager.Instance.MainCamera.ScreenPointToRay(mousePos);
            int hitNum = Physics.RaycastNonAlloc(ray.origin, ray.direction, hits);
            if (hitNum <= 0)
                return;

            RaycastHit firstHit = hits[0];
            Cell centerCell = GridSystem.CellGetAtPosition(firstHit.point, true); // 中心点
            if (null == centerCell)
            {
                buildingCampUnit.CellIndex = -1;
                buildingCampUnit.SetPos(new Vector3(firstHit.point.x, 0f, firstHit.point.z));
                return;
            }

            foreach (Vector2 offset in buildingCampUnit.Cfg.ListPosOffset)
            {
                Vector2Int newPosInt = GetCellPosByOffset(new Vector2Int(centerCell.row, centerCell.column), offset);
                if (!TryGetCellByRowCol(newPosInt, out Cell cell))
                    continue;

                setCellDrag.Add(cell);
                SetDragStateColor(cell);

                if (Vector2Int.zero == offset)
                {
                    buildingCampUnit.CellIndex = cell.index;
                    Vector3 pos = GridSystem.CellGetPosition(cell);
                    buildingCampUnit.SetPos(new Vector3(pos.x, 0f, pos.z));
                }
            }
        }

        /// <summary>
        /// 设置拖动状态的颜色
        /// </summary>
        /// <param name="cell"></param>
        private void SetDragStateColor(Cell cell)
        {
            if (!dicEditCellState.TryGetValue(cell.index, out E_CampCellState cellState))
                return;

            E_CampCellState tempState = cellState switch
            {
                E_CampCellState.Empty => E_CampCellState.Valid,
                E_CampCellState.Occupancy => E_CampCellState.Invalid,
                _ => throw new System.NotImplementedException(),
            };
            SetCellColorByCellState(cell, tempState);
        }

        /// <summary>
        /// 编辑检查能否放置
        /// </summary>
        /// <returns></returns>
        private bool EditCheckPlace(int cellIndex, params Vector2[] offsets)
        {
            if (!TryGetCellByIndex(cellIndex, out Cell centerCell))
                return false;

            foreach (Vector2 offset in offsets)
            {
                Vector2Int cellPos = GetCellPosByOffset(new Vector2Int(centerCell.row, centerCell.column), offset); // 计算格子位置
                if (!dicCellByRowCol.TryGetValue(cellPos, out Cell cell))
                    return false;

                if (!dicEditCellState.TryGetValue(cell.index, out E_CampCellState cellState))
                    return false;

                if (E_CampCellState.Empty != cellState)
                    return false;
            }

            return true;
        }

        /// <summary>
        /// 编辑下放置营地物件
        /// </summary>
        /// <param name="goCampObject"></param>
        /// <param name="gridIndex"></param>
        private void EditPlaceCampItem()
        {
            #region 设置营地地板状态
            if (!dicCellByIndex.TryGetValue(buildingCampUnit.CellIndex, out Cell centerCell))
                return;

            foreach (Vector2 offset in buildingCampUnit.Cfg.ListPosOffset)
            {
                Vector2Int gridPos = GetCellPosByOffset(new Vector2Int(centerCell.row, centerCell.column), offset); // 计算格子位置
                if (!dicCellByRowCol.TryGetValue(gridPos, out Cell cell))
                    continue;

                if (dicEditCellState.ContainsKey(cell.index))
                    dicEditCellState[cell.index] = E_CampCellState.Occupancy;
            }
            #endregion

            Vector3 pos = GridSystem.CellGetPosition(centerCell.index);
            buildingCampUnit.SetPos(new Vector3(pos.x, 0f, pos.z)); // 设置建筑物位置

            SetEditUnit.Add(buildingCampUnit);
            EventManager.Instance.Send(EventManager.EventName.Camp_EditPlaceUnit);
        }
        #endregion
    }
}