import React, { useCallback, useEffect, useMemo, useState } from 'react';
import {
  Avatar,
  Box,
  Button,
  config,
  Icon,
  IconButton,
  Icons,
  IconSrc,
  MenuItem,
  Overlay,
  OverlayBackdrop,
  OverlayCenter,
  Text,
  color,
} from 'folds';
import FocusTrap from 'focus-trap-react';
import {
  AdvancedDisplayOptions,
  AppearancePage,
  CallsPage,
  DataStoragePage,
  DesktopPage,
  MessagesPage,
  Privacy,
} from './general';
import { isTauri as isTauriEnv } from '../../hooks/useTauri';
import { PageNav, PageNavContent, PageNavHeader, PageRoot } from '../../components/page';
import { ScreenSize, useScreenSizeContext } from '../../hooks/useScreenSize';
import { Account } from './account';
import { useUserProfile } from '../../hooks/useUserProfile';
import { useMatrixClient } from '../../hooks/useMatrixClient';
import { getMxIdLocalPart, mxcUrlToHttp } from '../../utils/matrix';
import { useMediaAuthentication } from '../../hooks/useMediaAuthentication';
import { UserAvatar } from '../../components/user-avatar';
import { nameInitials } from '../../utils/common';
import { Notifications } from './notifications';
import { Devices } from './devices';
import { EmojisStickers } from './emojis-stickers';
import { DeveloperTools } from './developer-tools';
import { About } from './about';
import { UseStateProvider } from '../../components/UseStateProvider';
import { stopPropagation } from '../../utils/keyboard';
import { LogoutDialog } from '../../components/LogoutDialog';
import { SettingsPages } from './pages';
import { SettingsSearch } from './search/SettingsSearch';
import type { SettingsEntry } from './search/settingsIndex';

export { SettingsPages };

type SettingsMenuItem = {
  page: SettingsPages;
  name: string;
  icon: IconSrc;
};

const useSettingsMenuItems = (): SettingsMenuItem[] =>
  useMemo(
    () =>
      [
        { page: SettingsPages.AccountPage, name: 'Account', icon: Icons.User },
        { page: SettingsPages.AppearancePage, name: 'Appearance', icon: Icons.Sun },
        { page: SettingsPages.MessagesPage, name: 'Messages', icon: Icons.Message },
        { page: SettingsPages.NotificationPage, name: 'Notifications', icon: Icons.Bell },
        { page: SettingsPages.CallsPage, name: 'Calls & audio', icon: Icons.Phone },
        { page: SettingsPages.DevicesPage, name: 'Privacy & security', icon: Icons.ShieldUser },
        { page: SettingsPages.DataStoragePage, name: 'Data & storage', icon: Icons.Download },
        // [Gitea #459] Desktop-only options: nothing to show in a browser.
        ...(isTauriEnv()
          ? [{ page: SettingsPages.DesktopPage, name: 'Desktop', icon: Icons.Monitor }]
          : []),
        { page: SettingsPages.EmojisStickersPage, name: 'Emojis & stickers', icon: Icons.Smile },
        { page: SettingsPages.DeveloperToolsPage, name: 'Advanced', icon: Icons.Terminal },
        { page: SettingsPages.AboutPage, name: 'About', icon: Icons.Info },
      ] as SettingsMenuItem[],
    [],
  );

type SettingsProps = {
  initialPage?: SettingsPages;
  requestClose: () => void;
};
export function Settings({ initialPage, requestClose }: SettingsProps) {
  const mx = useMatrixClient();
  const useAuthentication = useMediaAuthentication();
  const userId = mx.getUserId()!;
  const profile = useUserProfile(userId);
  const displayName = profile.displayName ?? getMxIdLocalPart(userId) ?? userId;
  const avatarUrl = profile.avatarUrl
    ? (mxcUrlToHttp(mx, profile.avatarUrl, useAuthentication, 96, 96, 'crop') ?? undefined)
    : undefined;

  const screenSize = useScreenSizeContext();
  const [activePage, setActivePage] = useState<SettingsPages | undefined>(() => {
    if (initialPage) return initialPage;
    return screenSize === ScreenSize.Mobile ? undefined : SettingsPages.AccountPage;
  });
  const menuItems = useSettingsMenuItems();
  // [Gitea #463] Settings search: results replace the page list while typing;
  // picking one opens its page and briefly highlights the setting.
  const pageNames = useMemo(
    () => new Map(menuItems.map((item) => [item.page, item.name])),
    [menuItems],
  );
  const [searching, setSearching] = useState(false);
  const [highlight, setHighlight] = useState<string>();
  const pickResult = useCallback((entry: SettingsEntry) => {
    setActivePage(entry.page);
    setHighlight(entry.title);
  }, []);
  useEffect(() => {
    if (!highlight) return undefined;
    let tries = 0;
    let flashTimer: number | undefined;
    const find = () => {
      const match = [...document.querySelectorAll<HTMLElement>('p, span, label, h1, h2, h3')].find(
        (el) =>
          !el.closest('nav') && el.textContent?.trim() === highlight && el.offsetParent !== null,
      );
      if (!match) {
        tries += 1;
        if (tries < 20) poll = window.setTimeout(find, 100);
        else setHighlight(undefined);
        return;
      }
      const target = (match.closest('[class*="SequenceCard"]') as HTMLElement | null) ?? match;
      target.scrollIntoView({ block: 'center', behavior: 'smooth' });
      const prev = target.style.boxShadow;
      target.style.boxShadow = `0 0 0 2px ${color.Primary.Main}`;
      target.style.transition = 'box-shadow 0.3s';
      flashTimer = window.setTimeout(() => {
        target.style.boxShadow = prev;
        setHighlight(undefined);
      }, 1800);
    };
    let poll = window.setTimeout(find, 50);
    return () => {
      window.clearTimeout(poll);
      window.clearTimeout(flashTimer);
    };
  }, [highlight, activePage]);

  const handlePageRequestClose = () => {
    if (screenSize === ScreenSize.Mobile) {
      setActivePage(undefined);
      return;
    }
    requestClose();
  };

  return (
    <PageRoot
      nav={
        screenSize === ScreenSize.Mobile && activePage !== undefined ? undefined : (
          <PageNav size="300">
            <PageNavHeader outlined={false}>
              <Box grow="Yes" gap="200">
                <Avatar size="200" radii="300">
                  <UserAvatar
                    userId={userId}
                    src={avatarUrl}
                    renderFallback={() => <Text size="H6">{nameInitials(displayName)}</Text>}
                  />
                </Avatar>
                <Text size="H4" truncate>
                  Settings
                </Text>
              </Box>
              <Box shrink="No">
                {screenSize === ScreenSize.Mobile && (
                  <IconButton
                    onClick={requestClose}
                    variant="Background"
                    aria-label="Close settings"
                  >
                    <Icon src={Icons.Cross} />
                  </IconButton>
                )}
              </Box>
            </PageNavHeader>
            <Box grow="Yes" direction="Column">
              <SettingsSearch
                pageNames={pageNames}
                onActiveChange={setSearching}
                onPick={pickResult}
              />
              <PageNavContent>
                <nav aria-label="Settings sections" style={{ flexGrow: 1 }} hidden={searching}>
                  {menuItems.map((item) => (
                    <MenuItem
                      key={item.name}
                      variant="Background"
                      radii="400"
                      aria-pressed={activePage === item.page}
                      before={<Icon src={item.icon} size="100" filled={activePage === item.page} />}
                      onClick={() => setActivePage(item.page)}
                    >
                      <Text
                        style={{
                          fontWeight: activePage === item.page ? config.fontWeight.W600 : undefined,
                        }}
                        size="T300"
                        truncate
                      >
                        {item.name}
                      </Text>
                    </MenuItem>
                  ))}
                </nav>
              </PageNavContent>
              <Box style={{ padding: config.space.S200 }} shrink="No" direction="Column">
                <UseStateProvider initial={false}>
                  {(logout, setLogout) => (
                    <>
                      <Button
                        size="300"
                        variant="Critical"
                        fill="None"
                        radii="Pill"
                        before={<Icon src={Icons.Power} size="100" />}
                        onClick={() => setLogout(true)}
                      >
                        <Text size="B400">Logout</Text>
                      </Button>
                      {logout && (
                        <Overlay open backdrop={<OverlayBackdrop />}>
                          <OverlayCenter>
                            <FocusTrap
                              focusTrapOptions={{
                                onDeactivate: () => setLogout(false),
                                clickOutsideDeactivates: true,
                                escapeDeactivates: stopPropagation,
                              }}
                            >
                              <LogoutDialog handleClose={() => setLogout(false)} />
                            </FocusTrap>
                          </OverlayCenter>
                        </Overlay>
                      )}
                    </>
                  )}
                </UseStateProvider>
              </Box>
            </Box>
          </PageNav>
        )
      }
    >
      {activePage === SettingsPages.AppearancePage && (
        <AppearancePage requestClose={handlePageRequestClose} />
      )}
      {activePage === SettingsPages.MessagesPage && (
        <MessagesPage requestClose={handlePageRequestClose} />
      )}
      {activePage === SettingsPages.CallsPage && (
        <CallsPage requestClose={handlePageRequestClose} />
      )}
      {activePage === SettingsPages.DataStoragePage && (
        <DataStoragePage requestClose={handlePageRequestClose} />
      )}
      {activePage === SettingsPages.DesktopPage && (
        <DesktopPage requestClose={handlePageRequestClose} />
      )}
      {activePage === SettingsPages.AccountPage && (
        <Account requestClose={handlePageRequestClose} />
      )}
      {activePage === SettingsPages.NotificationPage && (
        <Notifications requestClose={handlePageRequestClose} />
      )}
      {activePage === SettingsPages.DevicesPage && (
        <Devices
          title="Privacy & security"
          before={<Privacy />}
          requestClose={handlePageRequestClose}
        />
      )}
      {activePage === SettingsPages.EmojisStickersPage && (
        <EmojisStickers requestClose={handlePageRequestClose} />
      )}
      {activePage === SettingsPages.DeveloperToolsPage && (
        <DeveloperTools
          title="Advanced"
          before={<AdvancedDisplayOptions />}
          requestClose={handlePageRequestClose}
        />
      )}
      {activePage === SettingsPages.AboutPage && <About requestClose={handlePageRequestClose} />}
    </PageRoot>
  );
}