using System;
using System.Collections;
using System.Collections.Generic;
using Unity.VisualScripting;
using UnityEngine;
using UnityEngine.UIElements;

public class MapBuilding : MonoBehaviour
{
    [HideInInspector] public Camera mainCamera;
    [HideInInspector] public GameObject startPositionObject;
    [HideInInspector] public float cellSize = 2;
    [HideInInspector] public MapListener mapListener;
    private Transform neighbor_container;

    private bool isBuild = false;
    private MapListener.RoomPrefabs choose_room_prefab = null;
    private MapPlacerItem map_placer_item;
    private MapBuildPlacer build_Placer;
    private MapListener.RoomPrefabs single_room_dataclass;
    private MapListener.RoomPrefabs area_room_dataclass;
    private MapListener.RoomPrefabs cage_room_dataclass;

    private void Start()
    {
        neighbor_container = startPositionObject.transform.Find("neighborContainer");
    }


    private void Update()
    {
        this.m_self_on_mouse_down_right_cancel(); // 鼠标右键取消创建
        this.self_on_click_down_left_yes(); // 鼠标左键确认创建
    }

    public void m_recv_initialize_room_prefabs_list(List<MapListener.RoomPrefabs> room_dataclass_list)
    {
        single_room_dataclass = mm_self_find_room_prefabs_dataclass(HomeMapSO.RoomType.SingleRoom);
        cage_room_dataclass = mm_self_find_room_prefabs_dataclass(HomeMapSO.RoomType.CageRoom);
        area_room_dataclass = mm_self_find_room_prefabs_dataclass(HomeMapSO.RoomType.AreaRoom);

        return;

        MapListener.RoomPrefabs mm_self_find_room_prefabs_dataclass(HomeMapSO.RoomType _room_type)
        {
            return room_dataclass_list.Find(item => item.roomType == _room_type);
        }
    }


    private void self_on_click_down_left_yes()
    {
        if (!Input.GetMouseButtonDown(0)) return; // 鼠标左键按下
        if (!isBuild) return; // 当前不在创建状态
        if (!build_Placer.m_recv_placer_is_snap_to_grid()) return; // 是否正在吸附单元格
        if (build_Placer.m_recv_is_trigger_with_has_build()) return; // 是否与已有建筑物有交集
        Vector2Int snap_grid_position = build_Placer.m_recv_placer_get_snap_grid_position_for_SO();
        mapListener.m_send_SOMap_create_a_room(snap_grid_position, choose_room_prefab.prefab);
        this.mm_self__destroy_temp_grid_and_variable(); // 销毁临时格子
        print("hello");
    }


    private void m_self_on_mouse_down_right_cancel() // 鼠标右键取消创建
    {
        if (!Input.GetMouseButtonDown(1)) return; // 鼠标右键按下
        if (!isBuild) return; // 当前不在创建状态
        this.mm_self__destroy_temp_grid_and_variable(); // 销毁临时格子
        return;
    }

    private void mm_self__destroy_temp_grid_and_variable()
    {
        foreach (Transform child in neighbor_container) // 清理方向格子, 移除容器下所有格子
        {
            Destroy(child.gameObject);
        }

        isBuild = false; // 取消创建状态
        choose_room_prefab = null; // 清理已选择房间的预制体
        Destroy(build_Placer.gameObject);
    }

    private void m_self_create_target_room_follow_mouse(GameObject roomPrefab) // 生成跟随鼠标移动的建筑物
    {
        Vector3 mouse_world_position = mainCamera.ScreenToWorldPoint(Input.mousePosition);
        mouse_world_position.z = 0;
        GameObject build_target_room = Instantiate(roomPrefab, mouse_world_position, Quaternion.identity);
        build_target_room.name = "BuildingPreview";
        build_target_room.transform.SetParent(startPositionObject.transform);
        build_target_room.layer = LayerMask.NameToLayer("UseBuild");
        mm_self__create_target_room(build_target_room); // 生成目标房间
        return;

        void mm_self__create_target_room(GameObject _build_room) // 挂载脚本
        {
            build_Placer = _build_room.AddComponent<MapBuildPlacer>();
            build_Placer.startPositionObject = startPositionObject;
            build_Placer.cellSize = cellSize;
            build_Placer.mainCamera = mainCamera;
            build_Placer.mapListener = mapListener;
            mmm_self__set_placer_sort_layer("UseBuild");
        }

        void mmm_self__set_placer_sort_layer(string layerName) // 设置排序图层
        {
            Transform placer_sprite_render = build_Placer.transform.Find("RenderContainer/RoomSpriteRender");
            Transform child_ui = build_Placer.transform.Find("RenderContainer/UI");
            Transform render_container = build_Placer.transform.Find("RenderContainer");
            // render_container.gameObject.SetActive(false);
            placer_sprite_render.GetComponent<SpriteRenderer>().sortingLayerName = layerName;
            foreach (Transform child in child_ui.transform)
            {
                if (!child.GetComponent<SpriteRenderer>()) continue;
                child.GetComponent<SpriteRenderer>().sortingLayerName = layerName;
            }
        }
    }


    private void m_self_create_direction_grid() // 创建可建造区域范围的格子
    {
        List<Vector2Int> neighbor_position_list = new List<Vector2Int>(); // 存放可建造区域范围的格子坐标
        List<Vector2Int> direction_list = new List<Vector2Int> // 存放可建造区域范围的格子坐标
            { new Vector2Int(0, 1), new Vector2Int(0, -1), new Vector2Int(-1, 0), new Vector2Int(1, 0) };
        List<Vector2Int> has_room_position_list = mapListener.m_send_SOMap_get_position_by_has_room(); // 收集已有房间的格子坐标
        foreach (var has_room_position in has_room_position_list) // 从已有房间的坐标推导出方向坐标列表
        {
            foreach (var dir_position in direction_list)
            {
                var neighbor_position = has_room_position + dir_position;
                if (neighbor_position.y >= 1) continue; // 地面上的空间不生成
                if (has_room_position_list.Contains(neighbor_position)) continue; // 已有房间的格子不生成
                neighbor_position_list.Add(neighbor_position);
            }
        }

        foreach (var _position in neighbor_position_list) // 生成四周的空间预制件
        {
            mm_self_create_a_area_room(_position);
        }

        return;

        GameObject mm_self_create_a_area_room(Vector2Int __position)
        {
            GameObject _room = Instantiate<GameObject>(area_room_dataclass.prefab,
                position: (startPositionObject.transform.position +
                           new Vector3(__position.x, __position.y, 0) * cellSize),
                rotation: Quaternion.identity);
            neighbor_container = startPositionObject.transform.Find("neighborContainer");
            _room.name = $"AreaGrid_{__position.x}.{__position.y}";
            _room.transform.SetParent(neighbor_container);
            MapBuildableCell roomScriptsComponent = _room.GetComponent<MapBuildableCell>();
            roomScriptsComponent.m_set_grid_position(__position);
            return _room;
        }
    }

    public void m_ui_button_start_build()
    {
        if (isBuild) return;
        choose_room_prefab = single_room_dataclass;
        map_placer_item = choose_room_prefab.prefab.GetComponent<MapPlacerItem>();
        m_self_create_direction_grid(); // 在已有建筑物四周生成可建造的格子
        m_self_create_target_room_follow_mouse(choose_room_prefab.prefab); // 生成一个跟随鼠标移动的建筑物
        isBuild = true;
    }


    public void m_ui_button_start_build_two_cell()
    {
        if (isBuild) return;
        choose_room_prefab = cage_room_dataclass;
        map_placer_item = choose_room_prefab.prefab.GetComponent<MapPlacerItem>();
        m_self_create_direction_grid(); // 在已有建筑物四周生成可建造的格子
        m_self_create_target_room_follow_mouse(choose_room_prefab.prefab);
        isBuild = true;
    }
}