import React, { MouseEventHandler, useCallback, useRef, useState, useEffect } from 'react';
import { useAtomValue, useSetAtom } from 'jotai';
import {
  Box,
  Button,
  Chip,
  config,
  Icon,
  IconButton,
  Icons,
  Menu,
  MenuItem,
  PopOut,
  RectCords,
  Spinner,
  Text,
  toRem,
} from 'folds';
import FocusTrap from 'focus-trap-react';
import { SequenceCard } from '../../components/sequence-card';
import * as css from './styles.css';
import {
  ChatButton,
  ControlDivider,
  FullscreenButton,
  MicrophoneButton,
  ScreenShareButton,
  ScreenshareAudioButton,
  SoundButton,
  VideoButton,
} from './Controls';
import { CallEmbed, useCallControlState } from '../../plugins/call';
import { useSetting } from '../../state/hooks/settings';
import { settingsAtom } from '../../state/settings';
import { callEmbedAtom } from '../../state/callEmbed';
import { useResizeObserver } from '../../hooks/useResizeObserver';
import { ScreenSize, useScreenSize } from '../../hooks/useScreenSize';
import { stopPropagation } from '../../utils/keyboard';
import { AsyncStatus, useAsyncCallback } from '../../hooks/useAsyncCallback';
import { useCallEmbedRef } from '../../hooks/useCallEmbed';
import { pttActiveAtom } from '../../hooks/useCallHotkeys';
import { CallSoundboard } from './CallSoundboard';
import { useRoomCallPolicy } from '../../hooks/useRoomCallPolicy';
import { ScreenshareConfirm } from './ScreenshareConfirm';

type CallControlsProps = {
  callEmbed: CallEmbed;
};
export function CallControls({ callEmbed }: CallControlsProps) {
  const controlRef = useRef<HTMLDivElement>(null);
  const callEmbedRef = useCallEmbedRef();
  const setCallEmbed = useSetAtom(callEmbedAtom);
  const screenSize = useScreenSize();
  const [narrowContainer, setNarrowContainer] = useState(document.body.clientWidth < 500);
  const [isFullscreen, setIsFullscreen] = useState(false);

  useResizeObserver(
    useCallback(() => {
      const element = controlRef.current;
      if (!element) return;
      setNarrowContainer(element.clientWidth < 500);
    }, []),
    useCallback(() => controlRef.current, []),
  );

  // Collapse to the stacked/compact layout whenever the bar's own container is
  // narrow (a small desktop call window) OR the viewport is a phone. The old
  // element-only `< 500` check left the ~11-control row overflowing off-screen
  // in the 500–750px band (landscape phones / small tablets).
  const compact = narrowContainer || screenSize === ScreenSize.Mobile;

  useEffect(() => {
    const onFullscreenChange = () => setIsFullscreen(!!document.fullscreenElement);
    document.addEventListener('fullscreenchange', onFullscreenChange);
    return () => document.removeEventListener('fullscreenchange', onFullscreenChange);
  }, []);

  const handleFullscreen = useCallback(() => {
    if (document.fullscreenElement) {
      document.exitFullscreen();
    } else {
      callEmbedRef.current?.requestFullscreen();
    }
  }, [callEmbedRef]);

  const { microphone, video, sound, screenshare, spotlight, screenshareAudioMuted } =
    useCallControlState(callEmbed.control);

  const [cords, setCords] = useState<RectCords>();
  const [shareConfirm, setShareConfirm] = useState(false);
  const [pttMode] = useSetting(settingsAtom, 'pttMode');
  const [pttKey] = useSetting(settingsAtom, 'pttKey');
  const [soundboardEnabled] = useSetting(settingsAtom, 'soundboardEnabled');
  // [Gitea #9] PTT/deafen key handling and AFK auto-mute live in useCallHotkeys
  // / useAfkAutoMute, mounted from CallEmbedProvider for the embed's lifetime
  // (this component only renders while the call room is selected). Only the
  // visual PTT chip remains here.
  const pttActive = useAtomValue(pttActiveAtom);

  // [P5-31 / Gitea #101] Hard room publish policy — hide controls the server
  // will refuse so users don't click dead buttons. Absent/true = allowed.
  // Shared with the app-wide CallStatus bar's CallControl via useRoomCallPolicy
  // so both surfaces apply the same gating.
  const { allowCamera, allowScreenshare } = useRoomCallPolicy(callEmbed.room);
  // Keep a forbidden control visible while its track is still live (so the user
  // can stop it); otherwise hide it entirely.
  const showCamera = allowCamera || video;
  const showScreenshare = allowScreenshare || screenshare;
  const showVideoGroup = showCamera || showScreenshare || !!document.fullscreenEnabled;
  const handleOpenMenu: MouseEventHandler<HTMLButtonElement> = (evt) => {
    setCords(evt.currentTarget.getBoundingClientRect());
  };

  const handleSpotlightClick = () => {
    callEmbed.control.toggleSpotlight();
    setCords(undefined);
  };

  const handleReactionsClick = () => {
    callEmbed.control.toggleReactions();
    setCords(undefined);
  };

  const handleSettingsClick = () => {
    callEmbed.control.toggleSettings();
    setCords(undefined);
  };

  const handleMicrophoneToggle = useCallback(
    () => callEmbed.control.toggleMicrophone(),
    [callEmbed],
  );
  const handleVideoToggle = useCallback(() => callEmbed.control.toggleVideo(), [callEmbed]);

  const [hangupState, hangup] = useAsyncCallback(
    useCallback(() => callEmbed.hangup(), [callEmbed]),
  );
  const exiting =
    hangupState.status === AsyncStatus.Loading || hangupState.status === AsyncStatus.Success;

  // C-M4: the normal teardown relies on EC echoing a Close/Hangup action after
  // it ACKs HangupCall (useCallHangupEvent -> clears callEmbedAtom -> dispose).
  // If EC ACKs but never echoes, the End button would spin forever. Fall back to
  // disposing the embed a few seconds after a successful hangup send, unless it
  // was already torn down by the normal path.
  useEffect(() => {
    if (hangupState.status !== AsyncStatus.Success) return undefined;
    const id = setTimeout(() => {
      if (!callEmbed.disposed) setCallEmbed(undefined);
    }, 4000);
    return () => clearTimeout(id);
  }, [hangupState.status, callEmbed, setCallEmbed]);

  const pttKeyLabel = pttKey === 'Space' ? 'SPACE' : pttKey.replace('Key', '').replace('Digit', '');

  return (
    <Box
      ref={controlRef}
      className={css.CallControlContainer}
      justifyContent="Center"
      alignItems="Center"
    >
      {pttMode && (
        <Chip
          variant={pttActive ? 'Success' : 'Warning'}
          fill="Soft"
          radii="400"
          style={{
            position: 'absolute',
            top: '-2.2rem',
            left: '50%',
            transform: 'translateX(-50%)',
            pointerEvents: 'none',
            whiteSpace: 'nowrap',
          }}
          outlined
        >
          <Text size="T200" style={{ fontWeight: 700 }}>
            {pttActive ? '● Live' : `PTT — Hold ${pttKeyLabel}`}
          </Text>
        </Chip>
      )}
      <ScreenshareConfirm
        open={shareConfirm}
        align="Center"
        onConfirm={() => {
          callEmbed.control.toggleScreenshare();
          setShareConfirm(false);
        }}
        onCancel={() => setShareConfirm(false)}
      />
      <SequenceCard
        className={css.ControlCard}
        variant="SurfaceVariant"
        gap="400"
        radii="500"
        alignItems="Center"
        justifyContent="SpaceBetween"
        wrap="Wrap"
      >
        <Box alignItems="Center" gap="Inherit" grow="Yes" direction={compact ? 'Column' : 'Row'}>
          <Box shrink="No" alignItems="Inherit" justifyContent="Inherit" gap="200">
            <MicrophoneButton enabled={microphone} onToggle={handleMicrophoneToggle} />
            <SoundButton enabled={sound} onToggle={() => callEmbed.control.toggleSound()} />
          </Box>
          {!compact && showVideoGroup && <ControlDivider />}
          {showVideoGroup && (
            <Box shrink="No" alignItems="Inherit" justifyContent="Inherit" gap="200">
              {/* Show a forbidden control while its track is still live so the
                  user can stop it; once stopped it hides and can't be restarted. */}
              {showCamera && <VideoButton enabled={video} onToggle={handleVideoToggle} />}
              {showScreenshare && (
                <>
                  <ScreenShareButton
                    enabled={screenshare}
                    onToggle={() =>
                      screenshare ? callEmbed.control.toggleScreenshare() : setShareConfirm(true)
                    }
                  />
                  {/* Mute-screenshare-audio sits directly next to the screenshare
                      control since they're the same concern. */}
                  <ScreenshareAudioButton
                    muted={screenshareAudioMuted}
                    onToggle={() => callEmbed.control.toggleScreenshareAudio()}
                  />
                </>
              )}
              {!!document.fullscreenEnabled && (
                <FullscreenButton isFullscreen={isFullscreen} onToggle={handleFullscreen} />
              )}
            </Box>
          )}
        </Box>
        {!compact && <ControlDivider />}
        <Box alignItems="Center" gap="Inherit" grow="Yes" direction={compact ? 'Column' : 'Row'}>
          <Box shrink="No" alignItems="Inherit" justifyContent="Inherit" gap="200">
            <ChatButton />
            {soundboardEnabled && <CallSoundboard callEmbed={callEmbed} />}
            <PopOut
              anchor={cords}
              position="Top"
              align="Center"
              content={
                <FocusTrap
                  focusTrapOptions={{
                    initialFocus: false,
                    onDeactivate: () => setCords(undefined),
                    clickOutsideDeactivates: true,
                    isKeyForward: (evt: KeyboardEvent) => evt.key === 'ArrowDown',
                    isKeyBackward: (evt: KeyboardEvent) => evt.key === 'ArrowUp',
                    escapeDeactivates: stopPropagation,
                  }}
                >
                  <Menu>
                    <Box direction="Column" style={{ padding: config.space.S100 }}>
                      <MenuItem
                        size="300"
                        variant="Surface"
                        radii="300"
                        onClick={handleSpotlightClick}
                      >
                        <Text size="B300" truncate>
                          {spotlight ? 'Grid View' : 'Spotlight View'}
                        </Text>
                      </MenuItem>
                      <MenuItem
                        size="300"
                        variant="Surface"
                        radii="300"
                        onClick={handleReactionsClick}
                      >
                        <Text size="B300" truncate>
                          Reactions
                        </Text>
                      </MenuItem>
                      <MenuItem
                        size="300"
                        variant="Surface"
                        radii="300"
                        onClick={handleSettingsClick}
                      >
                        <Text size="B300" truncate>
                          Settings
                        </Text>
                      </MenuItem>
                    </Box>
                  </Menu>
                </FocusTrap>
              }
            >
              <IconButton
                variant="Surface"
                fill="Soft"
                radii="400"
                size="400"
                onClick={handleOpenMenu}
                outlined
                aria-label="More options"
                aria-expanded={!!cords}
                aria-haspopup="menu"
              >
                <Icon size="400" src={Icons.VerticalDots} />
              </IconButton>
            </PopOut>
          </Box>
          <Box shrink="No" direction="Column">
            <Button
              style={{ minWidth: toRem(88) }}
              variant="Critical"
              fill="Solid"
              onClick={hangup}
              before={
                exiting ? (
                  <Spinner variant="Critical" fill="Solid" size="200" />
                ) : (
                  <Icon src={Icons.PhoneDown} size="200" filled />
                )
              }
              disabled={exiting}
            >
              <Text size="B400">End</Text>
            </Button>
          </Box>
        </Box>
      </SequenceCard>
    </Box>
  );
}