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

/* 本文件控制游戏右侧的菜单按键逻辑
 */

public class MenuController : MonoBehaviour
{
    // Start is called once before the first execution of Update after the MonoBehaviour is created
    private VisualElement mainMenu;
    private List<VisualElement> subMenus = new();
    //private bool isSubMenuShow = false;
    private GameObject uiPlaceholder;       // Manu会控制其他子菜单显示和隐藏，因此所有子菜单都必须挂载在UI Placeholder下
    private GameObject vamUI;      // vamUI = Voice and Manu UI; 
    private GameObject shoppingUI, statusUI, warehouseUI;       // 对应点击菜单后展开的几个子菜单


    void OnEnable()
    {
        Debug.Log("manu controller start");
        uiPlaceholder = GameObject.Find("UI Placeholder");
        vamUI = uiPlaceholder.transform.Find("VoiceAndMenu").gameObject;
        shoppingUI = uiPlaceholder.transform.Find("ShoppingUI").gameObject;
        statusUI = uiPlaceholder.transform.Find("Status").gameObject;
        warehouseUI = uiPlaceholder.transform.Find("Warehouse").gameObject;

        var root = GetComponent<UIDocument>().rootVisualElement;
        var menuArea = root.Q<VisualElement>("menuArea");
        mainMenu = menuArea.Q<VisualElement>("mainMenu");
        var home = menuArea.Q<VisualElement>("home");
        subMenus.Add(home);
        var playground = menuArea.Q<VisualElement>("playground");
        subMenus.Add(playground);
        var shop = menuArea.Q<VisualElement>("shop");
        subMenus.Add(shop);
        var warehouse = menuArea.Q<VisualElement>("warehouse");
        subMenus.Add(warehouse);
        var cameraBtn = menuArea.Q<VisualElement>("camera");
        subMenus.Add(cameraBtn);
        var status = menuArea.Q<VisualElement>("status");
        subMenus.Add(status);

        mainMenu.RegisterCallback<ClickEvent>(e => MainMenuClick(e));
        // root加载完成后，所有element算出位置后再进行计算
        root.RegisterCallback<GeometryChangedEvent>(e => OnMainMenuClickGeometryChanged(e));

        // 绑定按键点击事件
        playground.RegisterCallback<ClickEvent>(e => PlayGroundClick(e));
        shop.RegisterCallback<ClickEvent>(e => ShopClick(e));
        warehouse.RegisterCallback<ClickEvent>(e => WarehouseClick(e));
        status.RegisterCallback<ClickEvent>(e => StatusClick(e));
        cameraBtn.RegisterCallback<ClickEvent>(e => CameraClick(e));
    }

    private void OnDisable()
    {
        subMenus.Clear();       // 因为启动时候调用OnEable数据会被重复加载
    }

    // Update is called once per frame
    void Update()
    {
        CollapseMenuCheck();
    }

    Vector2 CalcPosition(Vector2 curPosition, float angle, float distance)
    {
        float radians = angle * Mathf.Deg2Rad;
        float x = curPosition.x + distance * Mathf.Cos(radians);
        float y = curPosition.y - distance * Mathf.Sin(radians);
        Vector2 newPosition = new Vector2(x, y);
        return new Vector2(x, y);
    }

    // 初始化所有按键的位置
    void InitialSubMenu()
    {
        foreach (var subMenu in subMenus)
        {
            subMenu.style.left = mainMenu.resolvedStyle.left;
            subMenu.style.top = mainMenu.resolvedStyle.top;
            subMenu.visible = false;
        }
    }

    // 点击主按键后所有子按键展开并显示
    void MainMenuClick(ClickEvent evt)
    {
        if (MenuData.isMenuShowed)
        {
            MenuReset();
            return;
        }
        // curAngle 初始角度，angleDelta 2个子菜单之间角度，distance 弹出距离，showTimer 显示时间
        float curAngle = 75f;
        float angleDelta = 40f;
        float distance = 70f;
        //float showTimer = 3.0f;
        foreach (var subMenu in subMenus)
        {
            subMenu.visible = true;
            var newPosition = CalcPosition(mainMenu.layout.position, curAngle, distance);
            //subMenu.layout.position.Set(newPosition.x, newPosition.y);
            subMenu.style.left = newPosition.x;
            subMenu.style.top = newPosition.y;
            if (subMenu.name == "home")
            {
                Debug.Log(subMenu.name + " " + newPosition.x + " " + newPosition.y);
            }
            curAngle += angleDelta;
        }
        mainMenu.transform.scale = new Vector2(0.8f, 0.8f);
        //Invoke("MenuReset", showTimer);
        //isSubMenuShow = true;
        MenuData.isMenuShowed = true;
        MenuData.menuShowTime = DateTime.Now;
    }

    // 初始化后屏幕尺寸变化时候调用。在此处应用于第一次屏幕初始化完成。
    void OnMainMenuClickGeometryChanged(GeometryChangedEvent evt)
    {
        //VisualElement targetElement = evt.target as VisualElement;
        InitialSubMenu();
    }

    void MenuReset()
    {
        //yield return new WaitForSeconds(3.0f);
        mainMenu.transform.scale = new Vector2(1.0f, 1.0f);
        MenuData.isMenuShowed = false;
        InitialSubMenu();
    }

    void PlayGroundClick(ClickEvent evt)
    {
        SceneManager.LoadScene("Playground", LoadSceneMode.Single);
    }

    void ShopClick(ClickEvent evt)
    {
        vamUI.SetActive(false);
        shoppingUI.SetActive(true);
    }

    void WarehouseClick(ClickEvent evt)
    {
        vamUI.SetActive(false);
        warehouseUI.SetActive(true);
    }

    void StatusClick(ClickEvent evt)
    {
        vamUI.SetActive(false);
        statusUI.SetActive(true);
    }

    void CameraClick(ClickEvent evt)
    {

    }

    // 菜单打开后收回菜单
    void CollapseMenuCheck()
    {
        if (MenuData.isMenuShowed)
        {
            // 计算两个时间点之间的差值
            TimeSpan difference = DateTime.Now - MenuData.menuShowTime;

            // 检查差值是否超过3秒
            if (difference.TotalSeconds > 3)
            {
                MenuReset();
            }
        }
    }
}

public static class MenuData
{
    public static bool isMenuShowed = false;
    public static DateTime menuShowTime;
}