import dom = require("dojo/dom-construct");
import { argumentNotNull, isNull, mixin } from "@implab/core-amd/safe";
import _WidgetBase = require("dijit/_WidgetBase");
import { _WidgetBaseConstructor, isNode } from "./traits";
import { BuildContextBase } from "./BuildContextBase";

export class WidgetContext extends BuildContextBase {
    widgetClass: _WidgetBaseConstructor;

    _instance: _WidgetBase | undefined;

    constructor(widgetClass: _WidgetBaseConstructor) {
        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);
    }

    _setAttrs(attrs: object): void {
        this._instance?.set(attrs);
    }

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

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

}