import { argumentNotNull } from "@implab/core-amd/safe";
import { RenditionBase } from "./RenditionBase";

export class FunctionRendition extends RenditionBase<Node> {
    private _component: (...args: any[]) => any;

    private _node: Node | undefined;

    constructor(component: (...args: any[]) => any) {
        super();
        argumentNotNull(component, "component");

        this._component = component;
    }

    protected _create(attrs: object, children: any[]) {
        const _attrs: any = attrs || {};
        const _children = children.map(x => this.getItemDom(x));
        this._node = this.getItemDom(
            this._component.length === 2 ?
                this._component.call(null, { ..._attrs }, _children) :
                this._component.call(null, { ..._attrs, children: _children })
        );
    }

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

}