import React, { useCallback, useEffect, useState } from 'react';
import FocusTrap from 'focus-trap-react';
import {
  Box,
  Icon,
  IconButton,
  Icons,
  Menu,
  MenuItem,
  PopOut,
  RectCords,
  Text,
  Tooltip,
  TooltipProvider,
  config,
  toRem,
} from 'folds';
import { CallEmbed } from '../../plugins/call';
import { MobileTouchTarget } from '../../styles/mobile.css';
import { stopPropagation } from '../../utils/keyboard';

/** Output selection needs setSinkId; Firefox/Safari/Android Chrome lack it. */
export const audioOutputSelectable = (): boolean =>
  typeof HTMLMediaElement !== 'undefined' &&
  'setSinkId' in HTMLMediaElement.prototype &&
  typeof navigator !== 'undefined' &&
  !!navigator.mediaDevices?.enumerateDevices;

type OutputDevice = { id: string; label: string };

/**
 * [Gitea #119] Speaker button in the call bar: a small menu of audio outputs
 * (headset ↔ speakers) without opening Settings. The choice goes to the fork
 * as io.lotus.set_audio_output; the fork's own picker is unreachable here
 * because the embed hides Element Call's footer.
 */
export function AudioOutputButton({ embed, disabled }: { embed: CallEmbed; disabled?: boolean }) {
  const [anchor, setAnchor] = useState<RectCords>();
  const [devices, setDevices] = useState<OutputDevice[]>([]);
  const [selected, setSelected] = useState<string | undefined>(embed.control.audioOutputId);

  const refresh = useCallback(async () => {
    try {
      const all = await navigator.mediaDevices.enumerateDevices();
      setDevices(
        all
          .filter((d) => d.kind === 'audiooutput')
          .map((d, i) => ({ id: d.deviceId, label: d.label || `Output ${i + 1}` })),
      );
    } catch {
      setDevices([]);
    }
  }, []);

  useEffect(() => {
    if (!anchor) return undefined;
    refresh();
    navigator.mediaDevices.addEventListener('devicechange', refresh);
    return () => navigator.mediaDevices.removeEventListener('devicechange', refresh);
  }, [anchor, refresh]);

  const choose = (id: string) => {
    embed.control.setAudioOutput(id);
    setSelected(id);
    setAnchor(undefined);
  };

  return (
    <PopOut
      anchor={anchor}
      position="Top"
      align="Center"
      offset={6}
      content={
        <FocusTrap
          focusTrapOptions={{
            initialFocus: false,
            // The list is enumerated after the menu opens; until then the only
            // tabbable node is the menu itself.
            fallbackFocus: '#call-audio-output-menu',
            onDeactivate: () => setAnchor(undefined),
            clickOutsideDeactivates: true,
            escapeDeactivates: stopPropagation,
          }}
        >
          <Menu
            id="call-audio-output-menu"
            tabIndex={-1}
            style={{ maxWidth: toRem(280), width: '100vw' }}
            aria-label="Audio output"
          >
            <Box direction="Column" gap="100" style={{ padding: config.space.S100 }}>
              {devices.length === 0 && (
                <Text size="T200" priority="300" style={{ padding: config.space.S200 }}>
                  No audio outputs found.
                </Text>
              )}
              {devices.map((d) => {
                const isSelected = selected ? d.id === selected : d.id === 'default';
                return (
                  <MenuItem
                    key={d.id}
                    size="300"
                    radii="300"
                    role="menuitemradio"
                    aria-checked={isSelected}
                    after={isSelected ? <Icon size="100" src={Icons.Check} /> : undefined}
                    onClick={() => choose(d.id)}
                  >
                    <Text style={{ flexGrow: 1 }} as="span" size="T300" truncate>
                      {d.label}
                    </Text>
                  </MenuItem>
                );
              })}
            </Box>
          </Menu>
        </FocusTrap>
      }
    >
      <TooltipProvider
        position="Top"
        tooltip={
          <Tooltip>
            <Text size="T200">Audio output</Text>
          </Tooltip>
        }
      >
        {(tipRef) => (
          <IconButton
            ref={tipRef}
            variant="Surface"
            fill="Soft"
            radii="300"
            size="300"
            className={MobileTouchTarget}
            outlined
            disabled={disabled}
            aria-label="Audio output"
            aria-haspopup="menu"
            aria-expanded={!!anchor}
            onClick={(e) => setAnchor(e.currentTarget.getBoundingClientRect())}
          >
            <Icon size="100" src={Icons.VolumeHigh} />
          </IconButton>
        )}
      </TooltipProvider>
    </PopOut>
  );
}