import { App } from "../App";
import { AtomOnce } from "../core/AtomOnce";
import { AtomUri } from "../core/AtomUri";
import { ServiceCollection } from "../di/ServiceCollection";
import { BusyIndicatorService } from "../services/BusyIndicatorService";
import { NavigationService } from "../services/NavigationService";
import { ChildEnumerator } from "./core/AtomUI";
import { WebBusyIndicatorService } from "./services/WebBusyIndicatorService";
import { WindowService } from "./services/WindowService";
import { AtomStyleSheet } from "./styles/AtomStyleSheet";
import { AtomTheme } from "./styles/AtomTheme";

declare var UMD: any;

export default class WebApp extends App {

    public readonly initPromise: Promise<void>;

    public get parentElement(): HTMLElement {
        return document.body;
    }

    private mRoot: any;
    public get root(): any {
        return this.mRoot;
    }

    public set root(v: any) {
        const old = this.mRoot;
        if (old) {
            old.dispose();
        }
        this.mRoot = v;
        if (!v) {
            return;
        }
        const pe = this.parentElement;
        const de: HTMLElement[] = Array.from(pe.children) as HTMLElement[];
        for (const iterator of de) {
            iterator.remove();
        }
        pe.appendChild(v.element);
    }

    public get theme(): AtomStyleSheet {
        return this.get(AtomStyleSheet);
    }

    public set theme(v: AtomStyleSheet) {
        this.put(AtomTheme, v);
        this.put(AtomStyleSheet, v);
    }

    private mContextId: number;
    public get contextId(): string {
        // let us set contextId
        this.mContextId ??=  parseInt((this.url.hash.contextId || "0").toString(), 10);
        if (!this.mContextId) {
            //  create new context Id in session...
            for (let index = 0; index < 100; index++) {
                const cid = `contextId${index}`;
                const cidData = sessionStorage.getItem(`contextId${index}`);
                if (!cidData) {
                    this.mContextId = index;
                    sessionStorage.setItem(cid, cid);
                    this.url.hash.contextId = index;
                    this.syncUrl();
                    break;
                }
            }
        }
        return `contextId_${this.mContextId}`;
    }

    private hashUpdater = new AtomOnce();

    private styleElement: HTMLElement;

    constructor() {
        super();

        this.url = new AtomUri(location.href);

        this.put(NavigationService, this.resolve(WindowService));

        this.put(WebApp, this);

        this.put(BusyIndicatorService, this.resolve(WebBusyIndicatorService));

        ServiceCollection.instance.registerSingleton(AtomStyleSheet, (sp) => sp.resolve(AtomTheme));

        window.addEventListener("hashchange", () => {
            this.hashUpdater.run(() => {
                this.url = new AtomUri(location.href);
            });
        });

        this.initPromise = new Promise<void>((resolve, reject) => {
            this.onReady(resolve);
        });

        // following must be done automatically by the user as we may need different and newer version
        // // registering font awesome
        // this.installStyleSheet("https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@5.9.0/css/all.css");
        // this.installStyleSheet({
        //     href: "https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css",
        //     integrity: "sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T",
        //     crossOrigin: "anonymous"
        // });
    }

    public updateDefaultStyle(textContent: string) {
        if (this.styleElement) {
            if (this.styleElement.textContent === textContent) {
                return;
            }
        }
        const ss = document.createElement("style");

        ss.textContent = textContent;
        if (this.styleElement) {
            this.styleElement.remove();
        }
        document.head.appendChild(ss);
        this.styleElement = ss;
    }

    /**
     * Do not use this method
     */
    public syncUrl(): void {
        this.hashUpdater.run(() => {
            const currentUrl = new AtomUri(location.href);
            const sourceHash = this.url.hash;
            const keyValues: Array<{ key: string, value: any}> = [];
            let modified: boolean = false;
            for (const key in sourceHash) {
                if (/^\_\$\_/.test(key)) {
                    continue;
                }
                if (sourceHash.hasOwnProperty(key)) {
                    const element = sourceHash[key];
                    const cv = currentUrl.hash[key];
                    if (element !== undefined) {
                        keyValues.push({ key, value: element });
                    }
                    if (cv === element) {
                        continue;
                    }
                    modified = true;
                }
            }
            if (!modified) {
                return;
            }
            const hash = keyValues.map((s) => `${s.key}=${encodeURIComponent(s.value)}`).join("&");
            location.hash = hash;
        });
    }

    protected invokeReady(): void {
        if (document.readyState === "complete") {
            super.invokeReady();
            return;
        }
        document.addEventListener("readystatechange", (e) => {
            super.invokeReady();
        });
    }

}

declare global {
    // tslint:disable-next-line: interface-name
    interface Window {
        // tslint:disable-next-line: ban-types
        CustomEvent?: Function;
    }
}

// tslint:disable-next-line: only-arrow-functions
(function() {

    if ( typeof window.CustomEvent === "function" ) { return false; }
    function CustomEvent( event, params ) {
        params = params || { bubbles: false, cancelable: false, detail: null };
        const evt = document.createEvent( "CustomEvent" );
        evt.initCustomEvent( event, params.bubbles, params.cancelable, params.detail );
        return evt;
    }
    (window as any).CustomEvent = CustomEvent;
  })();