import * as React from 'react';
import styles from './ApprovalAdmin.module.scss';
import type { IApprovalAdminProps } from './IApprovalAdminProps';
import { AdminApp } from './app/AdminApp';
import { ApprovalRouteApi } from '../services/api';
import { AadApiHttpClient, DevApiHttpClient, IHttpClient } from '../services/httpClient';
import { PortalDictionaryClient } from '../services/portalDictionary';
import { texts } from '../texts';

const FONTS_LINK_ID = 'tnsu-approval-admin-fonts';

function ensureFontsLoaded(): void {
  if (typeof document === 'undefined' || document.getElementById(FONTS_LINK_ID)) return;
  const link = document.createElement('link');
  link.id = FONTS_LINK_ID;
  link.rel = 'stylesheet';
  link.href = 'https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Lora:wght@500;600;700&display=swap';
  document.head.appendChild(link);
}

async function createHttpClient(props: IApprovalAdminProps): Promise<IHttpClient> {
  if (props.useDevAuth) {
    return new DevApiHttpClient(props.apiBaseUrl, props.devUserEmail || 'dev@tnsu.kz');
  }
  const aadClient = await props.context.aadHttpClientFactory.getClient(props.aadResourceId);
  return new AadApiHttpClient(aadClient, props.apiBaseUrl);
}

const ApprovalAdmin: React.FC<IApprovalAdminProps> = props => {
  const [api, setApi] = React.useState<ApprovalRouteApi | undefined>();
  const [dictionary, setDictionary] = React.useState<PortalDictionaryClient | undefined>();
  const [error, setError] = React.useState<string | undefined>();

  React.useEffect(() => {
    ensureFontsLoaded();
  }, []);

  React.useEffect(() => {
    let cancelled = false;
    setApi(undefined);
    setError(undefined);

    createHttpClient(props)
      .then(client => { if (!cancelled) setApi(new ApprovalRouteApi(client)); })
      .catch((e: Error) => { if (!cancelled) setError(e.message); });

    return () => { cancelled = true; };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [props.useDevAuth, props.apiBaseUrl, props.devUserEmail, props.aadResourceId]);

  // Справочники всегда идут через AAD, независимо от Dev-режима нашего API:
  // api.tnsu.kz принимает только настоящий токен, заголовок X-Dev-User-Email
  // ему ничего не говорит.
  React.useEffect(() => {
    let cancelled = false;
    setDictionary(undefined);

    props.context.aadHttpClientFactory
      .getClient(props.aadResourceId)
      .then(client => {
        if (!cancelled) setDictionary(new PortalDictionaryClient(client, props.portalBaseUrl));
      })
      .catch(() => { /* экран маршрутов покажет ошибку загрузки справочника */ });

    return () => { cancelled = true; };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [props.aadResourceId, props.portalBaseUrl]);

  return (
    <section className={styles.approvalAdmin}>
      {error && (
        <div className={styles.stateBox}>
          {texts.app.connectFailed(error)}
          <br />
          {texts.app.connectHint}
        </div>
      )}
      {!error && !api && <div className={styles.stateBox}>{texts.app.connecting}</div>}
      {api && (
        <AdminApp
          api={api}
          dictionary={dictionary}
          currentUserEmail={props.context.pageContext.user.email}
        />
      )}
    </section>
  );
};

export default ApprovalAdmin;