import Translations from "../i18n/Translations";
import BaseUIElement from "../BaseUIElement";
import {UIEventSource} from "../../Logic/UIEventSource";


export default class Link extends BaseUIElement {
    private readonly _href: string | UIEventSource<string>;
    private readonly _embeddedShow: BaseUIElement;
    private readonly _newTab: boolean;

    constructor(embeddedShow: BaseUIElement | string, href: string | UIEventSource<string>, newTab: boolean = false) {
        super();
        this._embeddedShow = Translations.W(embeddedShow);
        this._href = href;
        this._newTab = newTab;
        if (this._embeddedShow === undefined) {
            throw "Error: got a link where embeddedShow is undefined"
        }

    }

    public static OsmWiki(key: string, value?: string, hideKey = false) {
        if (value !== undefined) {
            let k = "";
            if (!hideKey) {
                k = key + "="
            }
            return new Link(k + value, `https://wiki.openstreetmap.org/wiki/Tag:${key}%3D${value}`)
        }
        return new Link(key, "https://wiki.openstreetmap.org/wiki/Key:" + key)
    }

    AsMarkdown(): string {
        // @ts-ignore
        return `[${this._embeddedShow.AsMarkdown()}](${this._href.data ?? this._href})`;
    }

    protected InnerConstructElement(): HTMLElement {
        const embeddedShow = this._embeddedShow?.ConstructElement();
        if (embeddedShow === undefined) {
            return undefined;
        }
        const el = document.createElement("a")
        if (typeof this._href === "string") {
            el.href = this._href
        } else {
            this._href.addCallbackAndRun(href => {
                el.href = href;
            })
        }
        if (this._newTab) {
            el.target = "_blank"
        }
        el.appendChild(embeddedShow)
        return el;
    }

}