import { BaseView } from "../base/BaseView";
import BaseMediator from "../base/BaseMediator";
import BaseScene from "../base/BaseScene";
import { OPEN_VIEW_OPTION } from "../Constants";
import Canvas = cc.Canvas;
import FrameworkCfg from "../FrameworkCfg";

/**
 * mvc框架控制类
 * @author ituuz
 * @description 负责控制和维护框架各个节点和结构间的跳转和关联。
 */
export class ViewManager {

    // 实例
    private static _instance: ViewManager = new ViewManager();

    /** 上一场景类 */
    private _preSceneMediatorCls: { new(): BaseMediator } = null;
    private _preSceneViewCls: { new(): BaseScene } = null;
    /** 当前场景类 */
    private _curSceneMediatorCls: { new(): BaseMediator } = null;
    private _curSceneViewCls: { new(): BaseScene } = null;

    /** 当前场景 */
    private _curScene: BaseMediator;
    /** 当前显示的pop view列表 */
    private _popViewList: BaseMediator[];
    /** 当前显示的layer view列表 */
    private _layerViewList: BaseMediator[];
    /***是否有黑色背景 */
    private _hasblackBg: boolean = false


    /**
     * @constructor
     * @private
     */
    private constructor() {
        this._popViewList = [];
        this._layerViewList = [];
    }

    /**
     * 单例获取类
     */
    public static getInstance(): ViewManager {
        return this._instance;
    }

    /**
     * 运行场景
     * @param {{new(): BaseMediator}} mediator 场景mediator类型，类类型。
     * @param {{new(): BaseScene}} view 场景mediator类型，类类型。
     * @param {Object} data 自定义的任意类型透传数据。（可选）
     * @param {()=>void} cb 加载完成回调.
     * @private
     */
    public __runScene__(mediator: { new(): BaseMediator }, view: { new(): BaseScene }, data?: any, cb?: () => void): void {
        // 创建并绑定场景
        let sceneMediator: BaseMediator = new mediator();
        sceneMediator["__init__"]();
        sceneMediator.init(data);

        // 如果前一场景不为空则进行清理
        if (this._curScene) {
            this._curScene.destroy();
        }

        // 保存当前场景
        this._curScene = sceneMediator;

        if (this._curSceneMediatorCls != null && this._curSceneViewCls != null) {
            this._preSceneMediatorCls = this._curSceneMediatorCls;
            this._preSceneViewCls = this._curSceneViewCls;
        }

        this._curSceneMediatorCls = mediator;
        this._curSceneViewCls = view;

        // 处理场景显示逻辑
        let scenePath: string = (<any>(view)).path();
        if (scenePath === "") {
            let ccs = new cc.Scene();
            ccs.name = "Scene";
            let canvasNode = new cc.Node();
            canvasNode.name = "Canvas";
            let canvas = canvasNode.addComponent(cc.Canvas);
            canvas.designResolution = FrameworkCfg.DESIGN_RESOLUTION;
            canvas.fitHeight = FrameworkCfg.FIT_HEIGHT;
            canvas.fitWidth = FrameworkCfg.FIT_WIDTH;
            sceneMediator.view = canvasNode.addComponent(view);
            sceneMediator.view.__init__();
            ccs.addChild(canvasNode);
            // 这里延迟1ms是为了让场景在下一帧加载
            setTimeout(() => {
                this.__closeAllView__();
                cc.director.runSceneImmediate(ccs);
                sceneMediator.viewDidAppear();
                cb && cb();
            }, 1);
        } else {
            cc.director.loadScene(scenePath, () => {
                this.__closeAllView__();
                let canvas = cc.director.getScene().getChildByName('Canvas');
                if (canvas) {
                    sceneMediator.view = canvas.addComponent(view);
                    sceneMediator.view.__init__();
                    sceneMediator.viewDidAppear();
                    cb && cb();
                } else {
                    console.log("场景中必须包含默认的Canvas节点！");
                }
            });
        }
    }

    /**
     * 返回上一场景
     * @returns {boolean}是否存在上一个场景
     */
    public __backScene__(): boolean {
        if (this._preSceneMediatorCls && this._preSceneViewCls) {
            this.__runScene__(this._preSceneMediatorCls, this._preSceneViewCls);
            return true;
        }
        return false;
    }

    /**
     * 打开view界面
     * @param {{new(): BaseMediator}} mediator 界面mediator类型，类类型。
     * @param {{new(): BaseView}} view view 场景mediator类型，类类型。
     * @param {boolean} hasShowBlackBg 是否有黑色背景图
     * @param {Object} data 自定义的任意类型透传数据。（可选）
     * @param {OPEN_VIEW_OPTION} option 打开ui的操作选项，枚举类型。
     * @param {number} zOrder 层级。
     * @param {()=>void} cb 加载完成回调.
     */
    public __showView__(mediator: { new(): BaseMediator }, view: { new(): BaseView },
        data?: any, option?: OPEN_VIEW_OPTION, zOrder?: number, cb?: () => void, hasShowBlackBg: boolean = false): void {
        // 处理打开UI的其他操作
        this.openViewOptionHandler(option);

        // 创建并绑定view
        let viewMediator: BaseMediator = new mediator();
        viewMediator["__init__"]();
        //设置是否有黑色背景
        this._hasblackBg = hasShowBlackBg;
        // 处理场景显示逻辑
        let viewPath: string = (<any>(view)).path();
        let viewPathList = viewPath.split('/');
        let bundle : string = viewPathList[0];
        viewPath = "";
        for(let i = 1;i<viewPathList.length;i++){
            if(i<viewPathList.length-1){
                viewPath+=viewPathList[i]+"/";
            }else{
                viewPath+=viewPathList[i];
            }
        }
        // console.log("bundle: ",bundle," viewPath: ",viewPath);
        
        if (viewPath === "") {
            let viewNode = new cc.Node();
            this.initViewMediator(viewMediator, viewNode, view, option);
            viewMediator.init(data);
            viewMediator.viewDidAppear();
            cb && cb();
        } else {
            if(bundle===""||bundle===null){
                cc.loader.loadRes(viewPath, cc.Prefab, (err, prefab) => {
                    if (err) {
                        console.error(err);
                        return;
                    }
                    let viewNode = cc.instantiate(prefab);
                    this.initViewMediator(viewMediator, viewNode, view, option);
                    viewMediator.init(data);
                    viewMediator.viewDidAppear();
                    cb && cb();
            });
            }else{
                cc.assetManager.loadBundle(bundle,(err,bundle)=>{
                    bundle.load(viewPath, cc.Prefab, (err, prefab: cc.Prefab) => {
                    if (err) {
                        console.error(err);
                        return;
                    }
                    let viewNode = cc.instantiate(prefab);
                    this.initViewMediator(viewMediator, viewNode, view, option);
                    viewMediator.init(data);
                    viewMediator.viewDidAppear();
                    cb && cb();
                });
                });
            }
        }
    }

    /**
     * 初始化ViewMediator
     * @param {BaseMediator} mediator ViewMediator
     * @param {cc.Node} viewNode view显示节点
     * @param {{new(): BaseView}} view view显示组件类
     * @param {OPEN_VIEW_OPTION} option 打开选项
     * @param {number} zOrder 层级排序
     */
    private initViewMediator(mediator: BaseMediator, viewNode: cc.Node, view: { new(): BaseView },
        option?: OPEN_VIEW_OPTION, zOrder?: number): void {
        viewNode.zIndex = zOrder;
        mediator.view = viewNode.addComponent(view);
        //出现黑色背景图
        this.blackBg(viewNode);
        mediator.view.__init__();
        // 根据不同打开类型，存储到不同队列中。
        if (option === OPEN_VIEW_OPTION.OVERLAY || option === OPEN_VIEW_OPTION.SINGLE) {
            this._popViewList.push(mediator);
        } else if (option === OPEN_VIEW_OPTION.LAYER) {
            this._layerViewList.push(mediator);
        }
    }
    /**
     * 
     * 是否显示黑色背景
     */
    private blackBg(viewNode) {
        if (this._hasblackBg) {
            this._hasblackBg = false;
            var node = new cc.Node('myNode');
            node.name = "blackBg" + viewNode.name;
            const sprite = node.addComponent(cc.Sprite);
            node.addComponent(cc.BlockInputEvents);
            cc.loader.loadRes("blackBg", cc.SpriteFrame, (err, spriteFrame) => {
                if (err) {
                    console.error(err);
                    return;
                }
                sprite.spriteFrame = spriteFrame;
                cc.director.getScene().getChildByName('Canvas').addChild(node);
                node.width = FrameworkCfg.DESIGN_RESOLUTION.width;
                node.height = FrameworkCfg.DESIGN_RESOLUTION.height;
                node.x = 0;
                node.y = 0;
                cc.director.getScene().getChildByName('Canvas').addChild(viewNode);

            });
        } else {
            cc.director.getScene().getChildByName('Canvas').addChild(viewNode);
        }

    }


    /**
     * 关闭指定View
     * @param view
     * @private
     */
    public __closeView__(view: BaseView): void {
        for (let i = 0; i < this._popViewList.length; i++) {
            if (this._popViewList[i].view === view) {
                this._popViewList.splice(i, 1);
                return;
            }
        }
        for (let i = 0; i < this._layerViewList.length; i++) {
            if (this._layerViewList[i].view === view) {
                this._layerViewList.splice(i, 1);
                return;
            }
        }
    }

    /**
     * 关闭所有弹出窗口
     * @private
     */
    public __closeAllPopView__(): void {
        for (let i = 0; i < this._popViewList.length; i++) {
            this._popViewList[i].view["__onClose__"]();
        }
        this._popViewList = [];
    }

    /**
     * 关闭所有添加层级
     * @private
     */
    public __closeAllAddLayer__(): void {
        for (let i = 0; i < this._layerViewList.length; i++) {
            this._layerViewList[i].view["__onClose__"]();
        }
        this._layerViewList = [];
    }

    /**
     * 关闭所有view
     * @private
     */
    public __closeAllView__(): void {
        this.__closeAllPopView__();
        this.__closeAllAddLayer__();
    }

    /**
     * 根据参数处理ui的打开方式
     * @param option
     * @private
     */
    private openViewOptionHandler(option: OPEN_VIEW_OPTION): void {
        // 设置默认值
        if (!option) {
            option = OPEN_VIEW_OPTION.OVERLAY;
        }
        // 根据不同操作做不同处理
        if (option === OPEN_VIEW_OPTION.SINGLE) {
            // TODO:暂时不提供这种关闭其他view的打开方式，可以通过BaseView.closeAllPopView()来实现。
        }
    }

    /**************************** getter and setter ******************************/
    get popViewList(): BaseMediator[] {
        return this._popViewList;
    }
    get layerViewList(): BaseMediator[] {
        return this._layerViewList;
    }
    get curScene(): BaseMediator {
        return this._curScene;
    }
    public pushLayerList(mediator: BaseMediator) {
        this._layerViewList.push(mediator);
    }


}