import { _decorator, assetManager, Button, Component, EventHandler, EventTouch, find, isValid, Node, Prefab, Toggle, ToggleContainer } from 'cc';
const { ccclass, property } = _decorator;
/***
 * @en internal class, used for handling node event.
 * @zh 内部类，用于节点事件监听
 * 
 *  */
@ccclass('tgxNodeEventAgent')
class __NodeEventAgent__ extends Component {
    /***
     * @en recieve button click event and deliver them to the real handlers.
     * @zh 接受按钮事件，并转发给真正的处理函数
     * */
    onButtonClicked(evt: EventTouch, customEventData) {
        let btn = (evt.target as Node).getComponent(Button);
        let clickEvents = btn.clickEvents;
        for (let i = 0; i < clickEvents.length; ++i) {
            let h = clickEvents[i];
            if (h.customEventData == customEventData) {
                let cb = h['$cb$'];
                let target = h['$target$']
                let args = h['$args$'];
                cb.apply(target, [btn, args]);
            }
        }
    }

    /***
     * @en recieve toggle event and deliver them to the real handlers.
     * @zh 接受Toggle事件，并转发给真正的处理函数
     * */
    onToggleEvent(toggle: Toggle, customEventData) {
        let checkEvents = toggle.checkEvents;
        //if (toggle['_toggleContainer']) {
        //    checkEvents = toggle['_toggleContainer'].checkEvents;
        //}
        for (let i = 0; i < checkEvents.length; ++i) {
            let h = checkEvents[i];
            if (h.customEventData == customEventData) {
                let cb = h['$cb$'];
                let target = h['$target$']
                let args = h['$args$'];
                cb.apply(target, [toggle, args]);
            }
        }
    }
}
let _id:number=0;
export default class ui_base  {
    private static _clss:Set<any>=new Set();
    private static _uis: ui_base[] = [];
    /***
    * @en hide and destroy all ui panel.
    * @zh 隐藏并销毁所有UI面板
    * */
    public static closeAll() {
        while (this._uis.length) {
            this._uis[0].close();
        }
        this._clss.clear();
    }
    //
    public static closeAndReleaseAll(){
        while (this._uis.length) {
            this._uis[0].closeAndRelease();
        }
        this._clss.clear();
    }
    //update all ui, called by UI.
    public static updateAll(dt:number) {
        for (let i = 0; i < this._uis.length; ++i) {
            let ctrl = this._uis[i];
            if (ctrl.node && isValid(ctrl.node)) {
                this._uis[i].onUpdate(dt);
            }
        }
    }
    private static _addCls(cls:any):void{
        if(!cls) return;this._clss.add(cls);
    }
    private static _removeCls(cls:any):void{
        if(!cls) return;this._clss.delete(cls);
    }
    private static _hasCls(cls:any):boolean{
        return this._clss.has(cls);
    }
    private _id: number = 0;
    private _bundle:string;
    private _prefab: string;
    private _layer: number;
    private _layout: any;
    private _cls:any;
    protected node: Node;
    private _destroyed:boolean = false;
    /***
     * @en the instance id to indicate an unique ui panel.
     * @zh 实例ID，用于标记一个唯一面板实例
     *  */
    public get id(): number {return this._id;}
    /***
    * @en url of the prefab used by this ui panel.
    * @zh 本UI使用prefab路径
    *  */
    public get prefab(): string  {return this._prefab;}
    public get bundle():string{return this._bundle;}
    /***
     * @en layer of this ui panel.
     * @zh 本UI所在的UI层级
     *  */
    public get layer(): number {return this._layer;}
    /***
     * @en layout of this ui panel.
     * @zh 本UI组件
     *  */
    public get layout(): Component { return this._layout;}
    public getLayout<T extends Component>():T{ return this._layout as T;}
    constructor(bundle:string,prefab: string, layer: number, layoutCls: any) {
        this._cls = null;
        this._bundle=bundle;
        this._prefab = prefab;
        this._layer = layer;
        this._layout = layoutCls;
        this._id = _id++;
    }
    //setup this ui,called by UIMgr.
    private _setup(cls:any,node: Node,...data: any[]) {
        ui_base._uis.push(this);
        this._cls=cls;
        (ui_base as any)._addCls(this._cls);
        this.node = node;
        if (this._layout) this._layout = this.node.getComponent(this._layout);
        //notify sub class to handle something.
        //节点创建完毕，调用子类的处理函数。
        this.onCreated(...data);
        //check whether it has been destroyed, if has, hide it.
        //检查是否为已销毁，如果已销毁，则走销毁流程
        if(this._destroyed) this.close();
    }
    /**
     * @en hide and destroy this ui panel.
     * @zh 隐藏并销毁此UI面板
     *  */
    public close(){
        this._resolve_close?.();
        this._resolve_close=null;
        this._destroyed = true;
        if(!this.node) return;
        this.node.removeFromParent();
        for (let i = 0; i < ui_base._uis.length; ++i) {
            if (ui_base._uis[i] == this) {
                ui_base._uis.splice(i, 1);
                break;
            }
        }
        this.onDispose();
        this.node.destroy();
        this.node = null;
        (ui_base as any)._removeCls(this._cls);
        this._cls=null;
    }
    public closeAndRelease(){
        this.close();
        assetManager.getBundle(this._bundle)?.release(this._prefab);
    }
    private _resolve_close: (() => void) | null = null;
    /**等待此ui关闭*/
    public wait_close():Promise<void>{
        if(this._resolve_close) return;
        return new Promise((resolve) => {this._resolve_close = resolve;});
    }
    /**
     * @en add button event handler
     * @zh 添加按钮事件
     * @param relativeNodePath to indicate a button node, can pass `string`|`Node`|`Button` here.
     * @param cb will be called when event emits. method format:(btn:Button,args:any)=>void
     * @param target the `this` argument of `cb`
     *  */
    onButtonEvent(relativeNodePath: string | Node | Button, cb: Function, target?: any, args?: any) {
        let buttonNode: Node = null;
        if (relativeNodePath instanceof Node) {
            buttonNode = relativeNodePath;
        }
        else if (relativeNodePath instanceof Button) {
            buttonNode = relativeNodePath.node;
        }
        else {
            buttonNode = find(relativeNodePath, this.node);
        }
        if (!buttonNode) {
            return null;
        }
        //添加转发器
        let agent = this.node.getComponent(__NodeEventAgent__);
        if (!agent) {
            agent = this.node.addComponent(__NodeEventAgent__);
        }

        let btn = buttonNode.getComponent(Button);
        let clickEvents = btn.clickEvents;
        let handler = new EventHandler();
        handler.target = this.node;
        handler.component = 'tgxNodeEventAgent';
        handler.handler = 'onButtonClicked';
        handler.customEventData = '' + _id++;

        //附加额外信息 供事件转发使用
        handler['$cb$'] = cb;
        handler['$target$'] = target;
        handler['$args$'] = args;

        clickEvents.push(handler);
        btn.clickEvents = clickEvents;
    }

    /**
     * @en remove button event handler
     * @zh 移除按钮事件
     * @param relativeNodePath to indicate a button node, can pass `string`|`Node`|`Button` here.
     * @param cb will be called when event emits.
     * @param target the `this` argument of `cb`
     *  */
    offButtonEvent(relativeNodePath: string | Node | Button, cb: Function, target: any) {
        let buttonNode: Node = null;
        if (relativeNodePath instanceof Node) {
            buttonNode = relativeNodePath;

        }
        else if (relativeNodePath instanceof Button) {
            buttonNode = relativeNodePath.node;
        }
        else {
            buttonNode = find(relativeNodePath, this.node);
        }

        if (!buttonNode) {
            return; ``
        }
        let agent = this.node.getComponent(__NodeEventAgent__);
        if (!agent) {
            return;
        }
        let btn = buttonNode.getComponent(Button);
        if (!btn) {
            return;
        }
        let clickEvents = btn.clickEvents;
        for (let i = 0; i < clickEvents.length; ++i) {
            let h = clickEvents[i];
            if (h['$cb$'] == cb && h['$target$'] == target) {
                clickEvents.splice(i, 1);
                btn.clickEvents = clickEvents;
                break;
            }
        }
    }

    /**
     * @en add toggle event handler
     * @zh 添加Toggle事件
     * @param relativeNodePath to indicate a button node, can pass `string`|`Node`|`Button` here.
     * @param cb will be called when event emits. method format:(btn:Toggle,args:any)=>void
     * @param target the `this` argument of `cb`
      */

    onToggleEvent(relativeNodePath: string | Node | Toggle | ToggleContainer, cb: Function, target?: any, args?: any) {
        let buttonNode: Node = null;
        if (relativeNodePath instanceof Node) {
            buttonNode = relativeNodePath;
        }
        else if (relativeNodePath instanceof Toggle) {
            buttonNode = relativeNodePath.node;
        }
        else if (relativeNodePath instanceof ToggleContainer) {
            buttonNode = relativeNodePath.node;
        }
        else {
            buttonNode = find(relativeNodePath, this.node);
        }

        if (!buttonNode) {
            return null;
        }

        //添加转发器
        let agent = this.node.getComponent(__NodeEventAgent__);
        if (!agent)  agent = this.node.addComponent(__NodeEventAgent__);
        let btn = buttonNode.getComponent(Toggle) as any;
        if (!btn)  btn = buttonNode.getComponent(ToggleContainer) as any;
        let checkEvents = btn.checkEvents;
        let handler = new EventHandler();
        handler.target = this.node;
        handler.component = 'tgxNodeEventAgent';
        handler.handler = 'onToggleEvent';
        handler.customEventData = '' + _id++;

        //附加额外信息 供事件转发使用
        handler['$cb$'] = cb;
        handler['$target$'] = target;
        handler['$args$'] = args;

        checkEvents.push(handler);
        btn.checkEvents = checkEvents;
    }

    /**
     * @en remove toggle event handler
     * @zh 移除Toggle事件
     * @param relativeNodePath to indicate a button node, can pass `string`|`Node`|`Button` here.
     * @param cb will be called when event emits. method format:(btn:Toggle,args:any)=>void
     * @param target the `this` argument of `cb`
     *  */
    offToggleEvent(relativeNodePath: string | Node | Toggle | ToggleContainer, cb: Function, target: any) {
        let buttonNode: Node = null;
        if (relativeNodePath instanceof Node) {
            buttonNode = relativeNodePath;
        }
        else if (relativeNodePath instanceof Toggle) {
            buttonNode = relativeNodePath.node;
        }
        else if (relativeNodePath instanceof ToggleContainer) {
            buttonNode = relativeNodePath.node;
        }
        else {
            buttonNode = find(relativeNodePath, this.node);
        }

        if (!buttonNode) {
            return null;
        }

        //添加转发器
        let agent = this.node.getComponent(__NodeEventAgent__);
        if (!agent) {
            return;
        }
        let btn = buttonNode.getComponent(Toggle) as any;
        if (!btn) {
            btn = buttonNode.getComponent(ToggleContainer) as any;
        }
        let checkEvents = btn.checkEvents;
        for (let i = 0; i < checkEvents.length; ++i) {
            let h = checkEvents[i];
            if (h['$cb$'] == cb && h['$target$'] == target) {
                checkEvents.splice(i, 1);
                btn.checkEvents = checkEvents;
                break;
            }
        }
    }
    //子类的所有操作，需要在这个函数之后。
    protected onCreated(...data: any[]){}
    //当界面销毁时调用
    protected onDispose(){}
    //
    protected onUpdate(dt?:number) { }
}