import { useCallback, useRef, useState, type DragEvent } from 'react';
import { useTranslation } from 'react-i18next';

import { Avatar } from '@/components/ui/Avatar';
import { VoiceFlags, VoiceQualityDot } from '@/components/voice/VoiceIndicators';
import { VoiceOccupantMenu } from '@/components/voice/VoiceOccupantMenu';
import {
  useVoiceChannels,
  useVoiceModeration,
  type VoiceOccupant,
} from '@/components/voice/useVoiceOccupants';
import { VOICE_DRAG_MIME } from '@/components/voice/voiceDrag';
import { speakingRingClass } from '@/components/voice/voiceStyles';
import { useVoiceConnectionStore } from '@/stores/voiceConnection';

/**
 * Строка участника голосовой комнаты в сайдбаре: аватар с кольцом речи,
 * имя, флаги и точка качества связи. Клик открывает меню с громкостью и
 * действиями модератора; при праве MOVE_MEMBERS строку можно перетащить
 * на другую голосовую комнату.
 */
export function VoiceOccupantRow({
  occupant,
  guildId,
  channelId,
}: {
  occupant: VoiceOccupant;
  guildId: string;
  channelId: string;
}) {
  const { t } = useTranslation();
  const permissions = useVoiceModeration(guildId);
  const moveTargets = useVoiceChannels(guildId).filter((channel) => channel.id !== channelId);
  // Подписка именно на карту пингов: селектор-функция не вызывает перерисовку.
  const latencies = useVoiceConnectionStore((state) => state.latencies);
  const setParticipantMuted = useVoiceConnectionStore((state) => state.setParticipantMuted);
  const setParticipantDeafened = useVoiceConnectionStore((state) => state.setParticipantDeafened);
  const moveParticipant = useVoiceConnectionStore((state) => state.moveParticipant);

  const [open, setOpen] = useState(false);
  const anchorRef = useRef<HTMLButtonElement | null>(null);
  const close = useCallback(() => setOpen(false), []);
  const label = t('voice.menu.label', { name: occupant.name });
  const canDrag = permissions.move && !occupant.isLocal;

  const onDragStart = (event: DragEvent<HTMLButtonElement>): void => {
    event.dataTransfer.setData(VOICE_DRAG_MIME, occupant.userId);
    event.dataTransfer.effectAllowed = 'move';
  };

  return (
    <li className="flex items-center">
      <button
        ref={anchorRef}
        type="button"
        aria-haspopup="menu"
        aria-expanded={open}
        aria-label={label}
        title={label}
        draggable={canDrag}
        onDragStart={canDrag ? onDragStart : undefined}
        onClick={(event) => {
          event.stopPropagation();
          setOpen((value) => !value);
        }}
        onContextMenu={(event) => {
          // ПКМ — привычный жест для меню участника (AGENT.md 7.14).
          event.preventDefault();
          setOpen(true);
        }}
        className="flex min-w-0 flex-1 items-center gap-1.5 rounded-[var(--radius-sm)] px-2 py-0.5 text-left text-xs text-fg-muted transition-colors duration-[var(--duration-fast)] hover:bg-surface-3 hover:text-fg"
      >
        <span className={`shrink-0 rounded-full ${speakingRingClass(occupant.isSpeaking)}`}>
          <Avatar
            name={occupant.name}
            seed={occupant.userId}
            fileId={occupant.avatarFileId}
            size="sm"
          />
        </span>
        <span className="min-w-0 flex-1 truncate">{occupant.name}</span>
        {occupant.isSpeaking ? <span className="sr-only">{t('voice.speaking')}</span> : null}
        <VoiceFlags
          className="shrink-0"
          selfMute={occupant.selfMute}
          selfDeaf={occupant.selfDeaf}
          serverMute={occupant.serverMute}
          serverDeaf={occupant.serverDeaf}
          camera={occupant.camera}
          screen={occupant.screen}
        />
        <VoiceQualityDot quality={occupant.quality} latencyMs={latencies[occupant.userId]} />
      </button>

      <VoiceOccupantMenu
        open={open}
        occupant={occupant}
        anchorRef={anchorRef}
        onClose={close}
        permissions={permissions}
        moveTargets={moveTargets}
        onMute={(userId, muted) => void setParticipantMuted(guildId, userId, muted)}
        onDeafen={(userId, deafened) => void setParticipantDeafened(guildId, userId, deafened)}
        onMove={(userId, targetId) => void moveParticipant(guildId, userId, targetId)}
      />
    </li>
  );
}