import PropTypes from "prop-types";
import { PureComponent } from "react";

import { defineMessages, injectIntl } from "react-intl";

import classNames from "classnames";
import { Redirect, Route, withRouter } from "react-router-dom";

import { connect } from "react-redux";

import { debounce } from "lodash";
import { HotKeys } from "react-hotkeys";

import { focusApp, unfocusApp, changeLayout } from "mastodon/actions/app";
import { synchronouslySubmitMarkers, submitMarkers, fetchMarkers } from "mastodon/actions/markers";
import { INTRODUCTION_VERSION } from "mastodon/actions/onboarding";
import PictureInPicture from "mastodon/features/picture_in_picture";
import { layoutFromWindow } from "mastodon/is_mobile";

import { uploadCompose, resetCompose, changeComposeSpoilerness } from "../../actions/compose";
import { clearHeight } from "../../actions/height_cache";
import { expandNotifications } from "../../actions/notifications";
import { fetchServer } from "../../actions/server";
import { expandHomeTimeline } from "../../actions/timelines";
import initialState, { me, owner, singleUserMode, trendsEnabled, trendsAsLanding } from "../../initial_state";

import BundleColumnError from "./components/bundle_column_error";
import Header from "./components/header";
import UploadArea from "./components/upload_area";
import ColumnsAreaContainer from "./containers/columns_area_container";
import LoadingBarContainer from "./containers/loading_bar_container";
import ModalContainer from "./containers/modal_container";
import NotificationsContainer from "./containers/notifications_container";
import {
  Compose,
  Status,
  GettingStarted,
  KeyboardShortcuts,
  Firehose,
  AccountTimeline,
  AccountGallery,
  HomeTimeline,
  Followers,
  Following,
  Reblogs,
  Favourites,
  DirectTimeline,
  HashtagTimeline,
  Notifications,
  FollowRequests,
  FavouritedStatuses,
  BookmarkedStatuses,
  FollowedTags,
  ListTimeline,
  Blocks,
  DomainBlocks,
  Mutes,
  PinnedStatuses,
  Lists,
  Directory,
  Explore,
  Onboarding,
  About,
  PrivacyPolicy,
} from "./util/async-components";
import { WrappedSwitch, WrappedRoute } from "./util/react_router_helpers";

// Dummy import, to make sure that <Status /> ends up in the application bundle.
// Without this it ends up in ~8 very commonly used bundles.
import "../../components/status";

const messages = defineMessages({
  beforeUnload: { id: "ui.beforeunload", defaultMessage: "Your draft will be lost if you leave Mastodon." },
});

const mapStateToProps = state => ({
  layout: state.getIn(["meta", "layout"]),
  isComposing: state.getIn(["compose", "is_composing"]),
  hasComposingText: state.getIn(["compose", "text"]).trim().length !== 0,
  hasMediaAttachments: state.getIn(["compose", "media_attachments"]).size > 0,
  canUploadMore: !state.getIn(["compose", "media_attachments"]).some(x => ["audio", "video"].includes(x.get("type"))) && state.getIn(["compose", "media_attachments"]).size < 4,
  dropdownMenuIsOpen: state.dropdownMenu.openId !== null,
  firstLaunch: state.getIn(["settings", "introductionVersion"], 0) < INTRODUCTION_VERSION,
  username: state.getIn(["accounts", me, "username"]),
});

const keyMap = {
  help: "?",
  new: "n",
  search: "s",
  forceNew: "option+n",
  toggleComposeSpoilers: "option+x",
  focusColumn: ["1", "2", "3", "4", "5", "6", "7", "8", "9"],
  reply: "r",
  favourite: "f",
  boost: "b",
  mention: "m",
  open: ["enter", "o"],
  openProfile: "p",
  moveDown: ["down", "j"],
  moveUp: ["up", "k"],
  back: "backspace",
  goToHome: "g h",
  goToNotifications: "g n",
  goToLocal: "g l",
  goToFederated: "g t",
  goToDirect: "g d",
  goToStart: "g s",
  goToFavourites: "g f",
  goToPinned: "g p",
  goToProfile: "g u",
  goToBlocked: "g b",
  goToMuted: "g m",
  goToRequests: "g r",
  toggleHidden: "x",
  toggleSensitive: "h",
  openMedia: "e",
};

class SwitchingColumnsArea extends PureComponent {

  static contextTypes = {
    identity: PropTypes.object,
  };

  static propTypes = {
    children: PropTypes.node,
    location: PropTypes.object,
    singleColumn: PropTypes.bool,
  };

  UNSAFE_componentWillMount () {
    if (this.props.singleColumn) {
      document.body.classList.toggle("layout-single-column", true);
      document.body.classList.toggle("layout-multiple-columns", false);
    } else {
      document.body.classList.toggle("layout-single-column", false);
      document.body.classList.toggle("layout-multiple-columns", true);
    }
  }

  componentDidUpdate (prevProps) {
    if (![this.props.location.pathname, "/"].includes(prevProps.location.pathname)) {
      this.node.handleChildrenContentChange();
    }

    if (prevProps.singleColumn !== this.props.singleColumn) {
      document.body.classList.toggle("layout-single-column", this.props.singleColumn);
      document.body.classList.toggle("layout-multiple-columns", !this.props.singleColumn);
    }
  }

  setRef = c => {
    if (c) {
      this.node = c;
    }
  };

  render () {
    const { children, singleColumn } = this.props;
    const { signedIn } = this.context.identity;
    const pathName = this.props.location.pathname;

    let redirect;

    if (signedIn) {
      if (singleColumn) {
        redirect = <Redirect from='/' to='/home' exact />;
      } else {
        redirect = <Redirect from='/' to='/deck/getting-started' exact />;
      }
    } else if (singleUserMode && owner && initialState?.accounts[owner]) {
      redirect = <Redirect from='/' to={`/@${initialState.accounts[owner].username}`} exact />;
    } else if (trendsEnabled && trendsAsLanding) {
      redirect = <Redirect from='/' to='/explore' exact />;
    } else {
      redirect = <Redirect from='/' to='/about' exact />;
    }

    return (
      <ColumnsAreaContainer ref={this.setRef} singleColumn={singleColumn}>
        <WrappedSwitch>
          {redirect}

          {singleColumn ? <Redirect from='/deck' to='/home' exact /> : null}
          {singleColumn && pathName.startsWith("/deck/") ? <Redirect from={pathName} to={pathName.slice(5)} /> : null}
          {!singleColumn && pathName === "/getting-started" ? <Redirect from='/getting-started' to='/deck/getting-started' exact /> : null}

          <WrappedRoute path='/getting-started' component={GettingStarted} content={children} />
          <WrappedRoute path='/keyboard-shortcuts' component={KeyboardShortcuts} content={children} />
          <WrappedRoute path='/about' component={About} content={children} />
          <WrappedRoute path='/privacy-policy' component={PrivacyPolicy} content={children} />

          <WrappedRoute path={["/home", "/timelines/home"]} component={HomeTimeline} content={children} />
          <Redirect from='/timelines/public' to='/public' exact />
          <Redirect from='/timelines/public/local' to='/public/local' exact />
          <WrappedRoute path='/public' exact component={Firehose} componentParams={{ feedType: "public" }} content={children} />
          <WrappedRoute path='/public/local' exact component={Firehose} componentParams={{ feedType: "community" }} content={children} />
          <WrappedRoute path='/public/remote' exact component={Firehose} componentParams={{ feedType: "public:remote" }} content={children} />
          <WrappedRoute path={["/conversations", "/timelines/direct"]} component={DirectTimeline} content={children} />
          <WrappedRoute path='/tags/:id' component={HashtagTimeline} content={children} />
          <WrappedRoute path='/lists/:id' component={ListTimeline} content={children} />
          <WrappedRoute path='/notifications' component={Notifications} content={children} />
          <WrappedRoute path='/favourites' component={FavouritedStatuses} content={children} />

          <WrappedRoute path='/bookmarks' component={BookmarkedStatuses} content={children} />
          <WrappedRoute path='/pinned' component={PinnedStatuses} content={children} />

          <WrappedRoute path='/start' exact component={Onboarding} content={children} />
          <WrappedRoute path='/directory' component={Directory} content={children} />
          <WrappedRoute path={["/explore", "/search"]} component={Explore} content={children} />
          <WrappedRoute path={["/publish", "/statuses/new"]} component={Compose} content={children} />

          <WrappedRoute path={["/@:acct", "/accounts/:id"]} exact component={AccountTimeline} content={children} />
          <WrappedRoute path='/@:acct/tagged/:tagged?' exact component={AccountTimeline} content={children} />
          <WrappedRoute path={["/@:acct/with_replies", "/accounts/:id/with_replies"]} component={AccountTimeline} content={children} componentParams={{ withReplies: true }} />
          <WrappedRoute path={["/accounts/:id/followers", "/users/:acct/followers", "/@:acct/followers"]} component={Followers} content={children} />
          <WrappedRoute path={["/accounts/:id/following", "/users/:acct/following", "/@:acct/following"]} component={Following} content={children} />
          <WrappedRoute path={["/@:acct/media", "/accounts/:id/media"]} component={AccountGallery} content={children} />
          <WrappedRoute path='/@:acct/:statusId' exact component={Status} content={children} />
          <WrappedRoute path='/@:acct/:statusId/reblogs' component={Reblogs} content={children} />
          <WrappedRoute path='/@:acct/:statusId/favourites' component={Favourites} content={children} />

          {/* Legacy routes, cannot be easily factored with other routes because they share a param name */}
          <WrappedRoute path='/timelines/tag/:id' component={HashtagTimeline} content={children} />
          <WrappedRoute path='/timelines/list/:id' component={ListTimeline} content={children} />
          <WrappedRoute path='/statuses/:statusId' exact component={Status} content={children} />
          <WrappedRoute path='/statuses/:statusId/reblogs' component={Reblogs} content={children} />
          <WrappedRoute path='/statuses/:statusId/favourites' component={Favourites} content={children} />

          <WrappedRoute path='/follow_requests' component={FollowRequests} content={children} />
          <WrappedRoute path='/blocks' component={Blocks} content={children} />
          <WrappedRoute path='/domain_blocks' component={DomainBlocks} content={children} />
          <WrappedRoute path='/followed_tags' component={FollowedTags} content={children} />
          <WrappedRoute path='/mutes' component={Mutes} content={children} />
          <WrappedRoute path='/lists' component={Lists} content={children} />

          <Route component={BundleColumnError} />
        </WrappedSwitch>
      </ColumnsAreaContainer>
    );
  }

}

class UI extends PureComponent {

  static contextTypes = {
    router: PropTypes.object.isRequired,
    identity: PropTypes.object.isRequired,
  };

  static propTypes = {
    dispatch: PropTypes.func.isRequired,
    children: PropTypes.node,
    isComposing: PropTypes.bool,
    hasComposingText: PropTypes.bool,
    hasMediaAttachments: PropTypes.bool,
    canUploadMore: PropTypes.bool,
    location: PropTypes.object,
    intl: PropTypes.object.isRequired,
    dropdownMenuIsOpen: PropTypes.bool,
    layout: PropTypes.string.isRequired,
    firstLaunch: PropTypes.bool,
    username: PropTypes.string,
  };

  state = {
    draggingOver: false,
  };

  handleBeforeUnload = e => {
    const { intl, dispatch, isComposing, hasComposingText, hasMediaAttachments } = this.props;

    dispatch(synchronouslySubmitMarkers());

    if (isComposing && (hasComposingText || hasMediaAttachments)) {
      e.preventDefault();
      // Setting returnValue to any string causes confirmation dialog.
      // Many browsers no longer display this text to users,
      // but we set user-friendly message for other browsers, e.g. Edge.
      e.returnValue = intl.formatMessage(messages.beforeUnload);
    }
  };

  handleWindowFocus = () => {
    this.props.dispatch(focusApp());
    this.props.dispatch(submitMarkers({ immediate: true }));
  };

  handleWindowBlur = () => {
    this.props.dispatch(unfocusApp());
  };

  handleDragEnter = (e) => {
    e.preventDefault();

    if (!this.dragTargets) {
      this.dragTargets = [];
    }

    if (this.dragTargets.indexOf(e.target) === -1) {
      this.dragTargets.push(e.target);
    }

    if (e.dataTransfer && Array.from(e.dataTransfer.types).includes("Files") && this.props.canUploadMore && this.context.identity.signedIn) {
      this.setState({ draggingOver: true });
    }
  };

  handleDragOver = (e) => {
    if (this.dataTransferIsText(e.dataTransfer)) {
      return false;
    }

    e.preventDefault();
    e.stopPropagation();

    try {
      e.dataTransfer.dropEffect = "copy";
    } catch (err) {
      console.error(err);
    }

    return false;
  };

  handleDrop = (e) => {
    if (this.dataTransferIsText(e.dataTransfer)) {
      return;
    }

    e.preventDefault();

    this.setState({ draggingOver: false });
    this.dragTargets = [];

    if (e.dataTransfer && e.dataTransfer.files.length >= 1 && this.props.canUploadMore && this.context.identity.signedIn) {
      this.props.dispatch(uploadCompose(e.dataTransfer.files));
    }
  };

  handleDragLeave = (e) => {
    e.preventDefault();
    e.stopPropagation();

    this.dragTargets = this.dragTargets.filter(el => el !== e.target && this.node.contains(el));

    if (this.dragTargets.length > 0) {
      return;
    }

    this.setState({ draggingOver: false });
  };

  dataTransferIsText = (dataTransfer) => {
    return (dataTransfer && Array.from(dataTransfer.types).filter((type) => type === "text/plain").length === 1);
  };

  closeUploadModal = () => {
    this.setState({ draggingOver: false });
  };

  handleServiceWorkerPostMessage = ({ data }) => {
    if (data.type === "navigate") {
      this.context.router.history.push(data.path);
    } else {
      console.warn("Unknown message type:", data.type);
    }
  };

  handleLayoutChange = debounce(() => {
    this.props.dispatch(clearHeight()); // The cached heights are no longer accurate, invalidate
  }, 500, {
    trailing: true,
  });

  handleResize = () => {
    const layout = layoutFromWindow();

    if (layout !== this.props.layout) {
      this.handleLayoutChange.cancel();
      this.props.dispatch(changeLayout({ layout }));
    } else {
      this.handleLayoutChange();
    }
  };

  componentDidMount () {
    const { signedIn } = this.context.identity;

    window.addEventListener("focus", this.handleWindowFocus, false);
    window.addEventListener("blur", this.handleWindowBlur, false);
    window.addEventListener("beforeunload", this.handleBeforeUnload, false);
    window.addEventListener("resize", this.handleResize, { passive: true });

    document.addEventListener("dragenter", this.handleDragEnter, false);
    document.addEventListener("dragover", this.handleDragOver, false);
    document.addEventListener("drop", this.handleDrop, false);
    document.addEventListener("dragleave", this.handleDragLeave, false);
    document.addEventListener("dragend", this.handleDragEnd, false);

    if ("serviceWorker" in  navigator) {
      navigator.serviceWorker.addEventListener("message", this.handleServiceWorkerPostMessage);
    }

    if (signedIn) {
      this.props.dispatch(fetchMarkers());
      this.props.dispatch(expandHomeTimeline());
      this.props.dispatch(expandNotifications());

      setTimeout(() => this.props.dispatch(fetchServer()), 3000);
    }

    this.hotkeys.__mousetrap__.stopCallback = (e, element) => {
      return ["TEXTAREA", "SELECT", "INPUT"].includes(element.tagName);
    };
  }

  componentWillUnmount () {
    window.removeEventListener("focus", this.handleWindowFocus);
    window.removeEventListener("blur", this.handleWindowBlur);
    window.removeEventListener("beforeunload", this.handleBeforeUnload);
    window.removeEventListener("resize", this.handleResize);

    document.removeEventListener("dragenter", this.handleDragEnter);
    document.removeEventListener("dragover", this.handleDragOver);
    document.removeEventListener("drop", this.handleDrop);
    document.removeEventListener("dragleave", this.handleDragLeave);
    document.removeEventListener("dragend", this.handleDragEnd);
  }

  setRef = c => {
    this.node = c;
  };

  handleHotkeyNew = e => {
    e.preventDefault();

    const element = this.node.querySelector(".compose-form__autosuggest-wrapper textarea");

    if (element) {
      element.focus();
    }
  };

  handleHotkeySearch = e => {
    e.preventDefault();

    const element = this.node.querySelector(".search__input");

    if (element) {
      element.focus();
    }
  };

  handleHotkeyForceNew = e => {
    this.handleHotkeyNew(e);
    this.props.dispatch(resetCompose());
  };

  handleHotkeyToggleComposeSpoilers = e => {
    e.preventDefault();
    this.props.dispatch(changeComposeSpoilerness());
  };

  handleHotkeyFocusColumn = e => {
    const index  = (e.key * 1) + 1; // First child is drawer, skip that
    const column = this.node.querySelector(`.column:nth-child(${index})`);
    if (!column) {
      return;
    }
    const container = column.querySelector(".scrollable");

    if (container) {
      const status = container.querySelector(".focusable");

      if (status) {
        if (container.scrollTop > status.offsetTop) {
          status.scrollIntoView(true);
        }
        status.focus();
      }
    }
  };

  handleHotkeyBack = () => {
    const { router } = this.context;

    if (router.history.location?.state?.fromMastodon) {
      router.history.goBack();
    } else {
      router.history.push("/");
    }
  };

  setHotkeysRef = c => {
    this.hotkeys = c;
  };

  handleHotkeyToggleHelp = () => {
    if (this.props.location.pathname === "/keyboard-shortcuts") {
      this.context.router.history.goBack();
    } else {
      this.context.router.history.push("/keyboard-shortcuts");
    }
  };

  handleHotkeyGoToHome = () => {
    this.context.router.history.push("/home");
  };

  handleHotkeyGoToNotifications = () => {
    this.context.router.history.push("/notifications");
  };

  handleHotkeyGoToLocal = () => {
    this.context.router.history.push("/public/local");
  };

  handleHotkeyGoToFederated = () => {
    this.context.router.history.push("/public");
  };

  handleHotkeyGoToDirect = () => {
    this.context.router.history.push("/conversations");
  };

  handleHotkeyGoToStart = () => {
    this.context.router.history.push("/getting-started");
  };

  handleHotkeyGoToFavourites = () => {
    this.context.router.history.push("/favourites");
  };

  handleHotkeyGoToPinned = () => {
    this.context.router.history.push("/pinned");
  };

  handleHotkeyGoToProfile = () => {
    this.context.router.history.push(`/@${this.props.username}`);
  };

  handleHotkeyGoToBlocked = () => {
    this.context.router.history.push("/blocks");
  };

  handleHotkeyGoToMuted = () => {
    this.context.router.history.push("/mutes");
  };

  handleHotkeyGoToRequests = () => {
    this.context.router.history.push("/follow_requests");
  };

  render () {
    const { draggingOver } = this.state;
    const { children, isComposing, location, dropdownMenuIsOpen, layout } = this.props;

    const handlers = {
      help: this.handleHotkeyToggleHelp,
      new: this.handleHotkeyNew,
      search: this.handleHotkeySearch,
      forceNew: this.handleHotkeyForceNew,
      toggleComposeSpoilers: this.handleHotkeyToggleComposeSpoilers,
      focusColumn: this.handleHotkeyFocusColumn,
      back: this.handleHotkeyBack,
      goToHome: this.handleHotkeyGoToHome,
      goToNotifications: this.handleHotkeyGoToNotifications,
      goToLocal: this.handleHotkeyGoToLocal,
      goToFederated: this.handleHotkeyGoToFederated,
      goToDirect: this.handleHotkeyGoToDirect,
      goToStart: this.handleHotkeyGoToStart,
      goToFavourites: this.handleHotkeyGoToFavourites,
      goToPinned: this.handleHotkeyGoToPinned,
      goToProfile: this.handleHotkeyGoToProfile,
      goToBlocked: this.handleHotkeyGoToBlocked,
      goToMuted: this.handleHotkeyGoToMuted,
      goToRequests: this.handleHotkeyGoToRequests,
    };

    return (
      <HotKeys keyMap={keyMap} handlers={handlers} ref={this.setHotkeysRef} attach={window} focused>
        <div className={classNames("ui", { "is-composing": isComposing })} ref={this.setRef} style={{ pointerEvents: dropdownMenuIsOpen ? "none" : null }}>
          <Header />

          <SwitchingColumnsArea location={location} singleColumn={layout === "mobile" || layout === "single-column"}>
            {children}
          </SwitchingColumnsArea>

          {layout !== "mobile" && <PictureInPicture />}
          <NotificationsContainer />
          <LoadingBarContainer className='loading-bar' />
          <ModalContainer />
          <UploadArea active={draggingOver} onClose={this.closeUploadModal} />
        </div>
      </HotKeys>
    );
  }

}

export default connect(mapStateToProps)(injectIntl(withRouter(UI)));