import dom = require("dojo/dom-construct");
import { argumentNotNull } from "@implab/core-amd/safe";
import { BuildContextBase } from "./BuildContextBase";
import { MapOf } from "@implab/core-amd/interfaces";

// tslint:disable-next-line: class-name
export interface _Widget {
    domNode: Node;

    get(attr: string): any;

    set(attr: string, value: any): void;
    set(attrs: MapOf<any>): void;

    containerNode?: Node
}

export type _WidgetCtor = new (attrs: any, srcNode?: string | Node) => _Widget;

export class WidgetContext extends BuildContextBase<Node> {
    widgetClass: _WidgetCtor;

    _instance: _Widget | undefined;

    constructor(widgetClass: _WidgetCtor) {
        super();
        argumentNotNull(widgetClass, "widgetClass");

        this.widgetClass = widgetClass;
    }

    _addChild(child: any): void {
        if (!this._instance || !this._instance.containerNode)
            throw new Error("Widget doesn't support adding children");

        dom.place(this.getChildDom(child), this._instance.containerNode);
    }

    _create(attrs: object, children: any[]) {
        this._instance = new this.widgetClass(attrs);
        if (children)
            children.forEach(x => this._addChild(x));
    }

    _getDomNode() {
        if (!this._instance)
            throw new Error("The instance of the widget isn't created");
        return this._instance.domNode;
    }

}