import React, { lazy, Suspense, useEffect, useState } from "react";
import { Route, Switch, useRouteMatch } from "react-router-dom";
import { IntlProvider, CustomFormats } from "react-intl";
import { Helmet } from "react-helmet";
import cloneDeep from "lodash-es/cloneDeep";
import mergeWith from "lodash-es/mergeWith";
import { ToastProvider } from "src/hooks/Toast";
import { LightboxProvider } from "src/hooks/Lightbox/context";
import { initPolyfills } from "src/polyfills";

import locales, { registerCountry } from "src/locales";
import {
  useConfiguration,
  useConfigureUI,
  useSystemStatus,
} from "src/core/StashService";
import flattenMessages from "./utils/flattenMessages";
import Mousetrap from "mousetrap";
import MousetrapPause from "mousetrap-pause";
import { ErrorBoundary } from "./components/ErrorBoundary";
import { MainNavbar } from "./components/MainNavbar";
import { PageNotFound } from "./components/PageNotFound";
import * as GQL from "./core/generated-graphql";
import { TITLE_SUFFIX } from "./components/Shared/constants";
import { LoadingIndicator } from "./components/Shared/LoadingIndicator";

import { ConfigurationProvider } from "./hooks/Config";
import { ManualProvider } from "./components/Help/context";
import { InteractiveProvider } from "./hooks/Interactive/context";
import { ReleaseNotesDialog } from "./components/Dialogs/ReleaseNotesDialog";
import { IUIConfig } from "./core/config";
import { releaseNotes } from "./docs/en/ReleaseNotes";
import { getPlatformURL, getBaseURL } from "./core/createClient";

const Performers = lazy(() => import("./components/Performers/Performers"));
const FrontPage = lazy(() => import("./components/FrontPage/FrontPage"));
const Scenes = lazy(() => import("./components/Scenes/Scenes"));
const Settings = lazy(() => import("./components/Settings/Settings"));
const Stats = lazy(() => import("./components/Stats"));
const Studios = lazy(() => import("./components/Studios/Studios"));
const Galleries = lazy(() => import("./components/Galleries/Galleries"));

const Movies = lazy(() => import("./components/Movies/Movies"));
const Tags = lazy(() => import("./components/Tags/Tags"));
const Images = lazy(() => import("./components/Images/Images"));
const Setup = lazy(() => import("./components/Setup/Setup"));
const Migrate = lazy(() => import("./components/Setup/Migrate"));

const SceneFilenameParser = lazy(
  () => import("./components/SceneFilenameParser/SceneFilenameParser")
);
const SceneDuplicateChecker = lazy(
  () => import("./components/SceneDuplicateChecker/SceneDuplicateChecker")
);

initPolyfills();

MousetrapPause(Mousetrap);

const intlFormats: CustomFormats = {
  date: {
    long: { year: "numeric", month: "long", day: "numeric" },
  },
};

const defaultLocale = "en-GB";

function languageMessageString(language: string) {
  return language.replace(/-/, "");
}

export const App: React.FC = () => {
  const config = useConfiguration();
  const [saveUI] = useConfigureUI();

  const { data: systemStatusData } = useSystemStatus();

  const language =
    config.data?.configuration?.interface?.language ?? defaultLocale;

  // use en-GB as default messages if any messages aren't found in the chosen language
  const [messages, setMessages] = useState<{}>();

  useEffect(() => {
    const setLocale = async () => {
      const defaultMessageLanguage = languageMessageString(defaultLocale);
      const messageLanguage = languageMessageString(language);

      // register countries for the chosen language
      await registerCountry(language);

      const defaultMessages = (await locales[defaultMessageLanguage]()).default;
      const mergedMessages = cloneDeep(Object.assign({}, defaultMessages));
      const chosenMessages = (await locales[messageLanguage]()).default;
      let customMessages = {};
      try {
        const res = await fetch(getPlatformURL() + "customlocales");
        if (res.ok) {
          customMessages = await res.json();
        }
      } catch (err) {
        console.log(err);
      }

      mergeWith(
        mergedMessages,
        chosenMessages,
        customMessages,
        (objVal, srcVal) => {
          if (srcVal === "") {
            return objVal;
          }
        }
      );

      setMessages(flattenMessages(mergedMessages));
    };

    setLocale();
  }, [language]);

  const setupMatch = useRouteMatch(["/setup", "/migrate"]);

  // redirect to setup or migrate as needed
  useEffect(() => {
    if (!systemStatusData) {
      return;
    }

    const baseURL = getBaseURL();

    if (
      window.location.pathname !== baseURL + "setup" &&
      systemStatusData.systemStatus.status === GQL.SystemStatusEnum.Setup
    ) {
      // redirect to setup page
      const newURL = new URL("setup", window.location.origin + baseURL);
      window.location.href = newURL.toString();
    }

    if (
      window.location.pathname !== baseURL + "migrate" &&
      systemStatusData.systemStatus.status ===
        GQL.SystemStatusEnum.NeedsMigration
    ) {
      // redirect to setup page
      const newURL = new URL("migrate", window.location.origin + baseURL);
      window.location.href = newURL.toString();
    }
  }, [systemStatusData]);

  function maybeRenderNavbar() {
    // don't render navbar for setup views
    if (!setupMatch) {
      return <MainNavbar />;
    }
  }

  function renderContent() {
    if (!systemStatusData) {
      return <LoadingIndicator />;
    }

    return (
      <ErrorBoundary>
        <Suspense fallback={<LoadingIndicator />}>
          <Switch>
            <Route exact path="/" component={FrontPage} />
            <Route path="/scenes" component={Scenes} />
            <Route path="/images" component={Images} />
            <Route path="/galleries" component={Galleries} />
            <Route path="/performers" component={Performers} />
            <Route path="/tags" component={Tags} />
            <Route path="/studios" component={Studios} />
            <Route path="/movies" component={Movies} />
            <Route path="/stats" component={Stats} />
            <Route path="/settings" component={Settings} />
            <Route
              path="/sceneFilenameParser"
              component={SceneFilenameParser}
            />
            <Route
              path="/sceneDuplicateChecker"
              component={SceneDuplicateChecker}
            />
            <Route path="/setup" component={Setup} />
            <Route path="/migrate" component={Migrate} />
            <Route component={PageNotFound} />
          </Switch>
        </Suspense>
      </ErrorBoundary>
    );
  }

  function maybeRenderReleaseNotes() {
    if (setupMatch || config.loading || config.error) {
      return;
    }

    const lastNoteSeen = (config.data?.configuration.ui as IUIConfig)
      ?.lastNoteSeen;
    const notes = releaseNotes.filter((n) => {
      return !lastNoteSeen || n.date > lastNoteSeen;
    });

    if (notes.length === 0) return;

    return (
      <ReleaseNotesDialog
        notes={notes.map((n) => n.content)}
        onClose={() => {
          saveUI({
            variables: {
              input: {
                ...config.data?.configuration.ui,
                lastNoteSeen: notes[0].date,
              },
            },
          });
        }}
      />
    );
  }

  return (
    <ErrorBoundary>
      {messages ? (
        <IntlProvider
          locale={language}
          messages={messages}
          formats={intlFormats}
        >
          <ConfigurationProvider
            configuration={config.data?.configuration}
            loading={config.loading}
          >
            {maybeRenderReleaseNotes()}
            <ToastProvider>
              <Suspense fallback={<LoadingIndicator />}>
                <LightboxProvider>
                  <ManualProvider>
                    <InteractiveProvider>
                      <Helmet
                        titleTemplate={`%s ${TITLE_SUFFIX}`}
                        defaultTitle="Stash"
                      />
                      {maybeRenderNavbar()}
                      <div className="main container-fluid">
                        {renderContent()}
                      </div>
                    </InteractiveProvider>
                  </ManualProvider>
                </LightboxProvider>
              </Suspense>
            </ToastProvider>
          </ConfigurationProvider>
        </IntlProvider>
      ) : null}
    </ErrorBoundary>
  );
};