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

public class MapBuilding : MonoBehaviour
{
    [HideInInspector] public Camera mainCamera;
    [HideInInspector] public HomeMapSO SOHomeMap;
    [HideInInspector] public GameObject startPositionObject;
    [HideInInspector] public GameObject AreaRoomPrefab;
    [HideInInspector] public GameObject singleRoomPrefab;
    [HideInInspector] public GameObject CageRoomPrefab;
    [HideInInspector] public float cellSize = 2;
    [HideInInspector] public MapListener mapListener;

    private Transform neighbor_container;
    private GameObject current_build_room = null;
    private bool isBuild = false;

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

    private void Update()
    {
        this.self_on_mouse_down_right_cancel(); // 鼠标右键取消创建
    }

    private void self_on_mouse_down_right_cancel() // 鼠标右键取消创建
    {
        if (!isBuild) return;
        if (!Input.GetMouseButtonDown(1)) return;
        // 清理方向格子
        foreach (Transform child in neighbor_container)
        {
            // 移除容器下所有格子
            Destroy(child.gameObject);
        }

        // 清理临时生成的建筑物
        if (current_build_room)
        {
            Destroy(current_build_room);
        }

        isBuild = false;
    }

    private void self_create_direction_grid()
    {
        // 需要创建格子的坐标
        List<Vector2Int> neighbor_position_list = new List<Vector2Int>();
        // 方向列表：上下左右
        List<Vector2Int> direction_list = new List<Vector2Int>
        {
            new Vector2Int(1, 0), // 右
            new Vector2Int(0, 1), // 上 
            new Vector2Int(-1, 0), // 左
            new Vector2Int(0, -1) // 下
        };
        // 收集已有房间的格子坐标
        List<Vector2Int> has_room_position_list = SOHomeMap.m_get_position_by_has_room();

        // 从已有房间的坐标推导出方向坐标列表
        foreach (var hr_position in has_room_position_list)
        {
            foreach (var dir_position in direction_list)
            {
                var neighbor_position = hr_position + dir_position;
                if (neighbor_position.x >= 1) continue; // 地面上的空间不生成
                if (!has_room_position_list.Contains(neighbor_position))
                {
                    neighbor_position_list.Add(neighbor_position);
                }
            }
        }

        // 生成四周的空间预制件
        foreach (var _position in neighbor_position_list)
        {
            GameObject room = Instantiate<GameObject>(
                AreaRoomPrefab,
                position: (startPositionObject.transform.position +
                           new Vector3(_position.y, _position.x, 0) * cellSize),
                rotation: Quaternion.identity);
            neighbor_container = startPositionObject.transform.Find("neighborContainer");
            room.name = $"Cell_{_position.x}.{_position.y}";
            room.transform.SetParent(neighbor_container);

            MapBuildableCell roomScriptsComponent = room.GetComponent<MapBuildableCell>();
            roomScriptsComponent.m_set_grid_position(_position);
        }
    }

    // 生成跟随鼠标移动的建筑物
    private void self_create_room_follow_mouse(GameObject roomPrefab)
    {
        Vector3 mouse_world_position = mainCamera.ScreenToWorldPoint(Input.mousePosition);
        mouse_world_position.z = 0;

        current_build_room = Instantiate(roomPrefab,
            mouse_world_position, Quaternion.identity);
        current_build_room.name = "BuildingPreview";
        current_build_room.transform.SetParent(startPositionObject.transform);
        current_build_room.layer = LayerMask.NameToLayer("UseBuild");
        this.m_create_temp_room(); // 创建临时房间
    }

    private void m_create_temp_room()
    {
        // 挂载脚本
        MapBuildPlacer placer = current_build_room.GetComponent<MapBuildPlacer>();
        placer.startPositionObject = startPositionObject;
        placer.cellSize = cellSize;
        placer.mainCamera = mainCamera;

        // 设置排序图层

        Transform placer_sprite_render = placer.transform.Find("RenderContainer/RoomSpriteRender");
        Transform child_ui = placer.transform.Find("RenderContainer/UI");
        Transform render_container = placer.transform.Find("RenderContainer");
        render_container.gameObject.SetActive(false);
        placer_sprite_render.GetComponent<SpriteRenderer>().sortingLayerName = "UseBuild";
        foreach (Transform child in child_ui.transform)
        {
            if (!child.GetComponent<SpriteRenderer>()) continue;
            child.GetComponent<SpriteRenderer>().sortingLayerName = "UseBuild";
        }
    }


    // UI function 
    public void ui_button_start_build()
    {
        if (isBuild) return;
        self_create_direction_grid(); // 在已有建筑物四周生成可建造的格子
        self_create_room_follow_mouse(singleRoomPrefab); // 生成一个跟随鼠标移动的建筑物
        isBuild = true;
    }

    public void ui_button_start_build_two_cell()
    {
        if (isBuild) return;
        self_create_direction_grid(); // 在已有建筑物四周生成可建造的格子
        self_create_room_follow_mouse(CageRoomPrefab);
        isBuild = true;
    }
}