using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.UI;
using XFramework;

public class UIManager 
{
    /// <summary>
    /// 存储所有的UI以及UI对应的GameObject
    /// key为路径
    /// </summary>
    private Dictionary<string, GameObject> dictUI;
    /// <summary>
    /// 存储所有的UI以及UI对应的BasePanel
    /// key为路径
    /// </summary>
    private Dictionary<string, BasePanel> dictPanel;
    /// <summary>
    /// 管理UI的栈
    /// </summary>
    private Stack<BasePanel> panelStack;
    /// <summary>
    /// 画布的名称
    /// </summary>
    private string canvasName;
    /// <summary>
    /// 画布对象
    /// </summary>
    private GameObject canvasObj;

    /// <summary>
    /// 面板管理器
    /// </summary>
    /// <param name="name">画布名称</param>
    public UIManager(string name = "Canvas")
    {
        dictUI = new Dictionary<string, GameObject>();
        dictPanel = new Dictionary<string, BasePanel>();
        panelStack = new Stack<BasePanel>();
        canvasName = name;
        canvasObj = GameObject.Find(canvasName);
    }

    /// <summary>
    /// 初始化画布缩放设置
    /// </summary>
    /// <param name="adaptScreenSize"></param>
    public void InitCanvasScaler(CanvasScaler.ScaleMode scaleMode, Vector2 adaptScreenSize,float matchWOH)
    {
        if (canvasObj)
        {
            CanvasScaler canvasScaler = canvasObj.GetComponent<CanvasScaler>();
            canvasScaler.uiScaleMode = scaleMode;
            canvasScaler.referenceResolution = adaptScreenSize;
            canvasScaler.matchWidthOrHeight = matchWOH;
        }
    }

    /// <summary>
    /// 获取一个UI对象
    /// </summary>
    /// <param name="ui">UI类型</param>
    /// <returns></returns>
    private GameObject GetSingleUI(UIType ui)
    {
        if (dictUI.ContainsKey(ui.Name))
        {
            ui.Init = true;
            return dictUI[ui.Name];
        }
        if (canvasObj == null)
        {
            canvasObj = GameObject.Find(canvasName);
            if (canvasObj == null)
            {
                Debug.LogError($"名为{canvasName}的画布不存在");
                return null;
            }
        }
        GameObject obj = GameObject.Instantiate<GameObject>(Resources.Load<GameObject>(ui.Path), canvasObj.transform);
        obj.name = ui.Name;
        dictUI.Add(ui.Name, obj);
        return obj;
    }

    /// <summary>
    /// 移除UI
    /// </summary>
    /// <param name="ui"></param>
    /// <param name="isDestroy">是否销毁，不销毁即隐藏</param>
    public void DestroyUI(UIType ui, bool isDestroy = false)
    {
        if (dictUI.ContainsKey(ui.Name))
        {
            if (isDestroy)
            {
                GameObject.Destroy(dictUI[ui.Name]);
                dictUI.Remove(ui.Name);
                dictPanel.Remove(ui.Name);
            }
            else
            {
                dictUI[ui.Name].transform.PanelAppearance(false);
            }
        }
    }

    /// <summary>
    /// 加入一个新面板
    /// </summary>
    /// <param name="newPanel"></param>
    public BasePanel Push(BasePanel newPanel)
    {
        if (panelStack.Count > 0)
            panelStack.Peek().OnDisable();//显示新面板时屏蔽下层面板

        if (!dictPanel.ContainsKey(newPanel.UI.Name))
        {
            dictPanel.Add(newPanel.UI.Name, newPanel);
            GameObject obj = GetSingleUI(newPanel.UI);
            newPanel.ActivePanel = obj.transform;
            newPanel.Initializa(this);
        }
        else
        {
            BasePanel p = dictPanel[newPanel.UI.Name];
            newPanel = p;
        }
        newPanel.OnStart();
        if (panelStack.Count > 0)
        {
            //防止连续推送重复的面板
            if (panelStack.Peek().UI.Name != newPanel.UI.Name)
                panelStack.Push(newPanel);
        }
        else
            panelStack.Push(newPanel);
        return newPanel;
    }

    /// <summary>
    /// 移除最上层面板
    /// </summary>
    public void Pop()
    {
        if (panelStack.Count > 0)
            panelStack.Pop().OnDestroy();
        if (panelStack.Count > 0)
            panelStack.Peek().OnEnable();
    }

    /// <summary>
    /// 移除所有面板  场景跳转或所有UI需要重新加载时调用
    /// </summary>
    public void PopAll()
    {
        var values = dictPanel.Values.ToList();
        while (values.Count > 0)
        {
            values[0].OnDestroy(true);
            values.RemoveAt(0);
        }
    }

    /// <summary>
    /// 获取当前显示的面板
    /// </summary>
    public BasePanel GetActivePanel()
    {
        if (panelStack.Count == 0) return null;
        return panelStack.Peek();
    }



    /// <summary>
    /// 更新当前显示的面板
    /// </summary>
    public void ChangePanel(object data)
    {
        if (panelStack.Count == 0) return;
        panelStack.Peek().Change(data);
    }


    /// <summary>
    /// 更新当前显示的面板
    /// </summary>
    public void ChangePanel( float data) 
    {
        if (panelStack.Count == 0) return;
        panelStack.Peek().Change(data);
    }

    /// <summary>
    /// 更新当前显示的面板 
    /// </summary>
    public void ChangePanel(string msgType,object value)
    {
        if (panelStack.Count == 0) return;
        panelStack.Peek().Change(msgType,value);
    }

    //在当前UI上显示提示文字
    public void ShowPromptText(string promprMsg,Color textColor)
    {
        if (panelStack.Count == 0) return;
        panelStack.Peek().ShowPromoptText(promprMsg, textColor,Vector2.zero);
    }

    /// <summary>
    /// 更新指定面板面板
    /// </summary>
    public void ChangeOnePanel(string panelName,object data)
    {
        if (!dictPanel.ContainsKey(panelName)) 
            return;
        dictPanel[panelName].Change(data);
    }
}