import { useQuery } from '@tanstack/react-query';
import { useTranslation } from 'react-i18next';

import {
  callParticipant,
  dmCallHistoryQueryKey,
  fetchDmCallHistory,
  type DmCall,
} from '@/api/calls';
import type { Channel } from '@/api/types';
import { Avatar } from '@/components/ui/Avatar';
import { SkeletonLines } from '@/components/ui/Skeleton';
import { useAuthorDirectory } from '@/components/chat/useAuthorDirectory';
import { useSessionStore } from '@/stores/session';

/**
 * История звонков беседы (AGENT.md 7.8, Фаза 7): кто звонил, когда, сколько
 * длился разговор и кто не ответил. Данные приходят ручкой `GET /calls` —
 * отдельной от переписки, чтобы звонки не мешали непрочитанным сообщениям.
 */
export function DmCallHistoryPanel({ channel }: { channel: Channel }) {
  const { t } = useTranslation();
  const currentUserId = useSessionStore((state) => state.user?.id ?? null);
  const query = useQuery({
    queryKey: dmCallHistoryQueryKey(channel.id),
    queryFn: ({ signal }) => fetchDmCallHistory(channel.id, undefined, signal),
    staleTime: 30_000,
  });
  const calls = query.data ?? [];
  const userIds = calls.flatMap((call) => call.participants.map((item) => item.user_id));
  const authors = useAuthorDirectory(null, userIds);

  /** Длительность разговора: минуты и секунды, у гудков — прочерк. */
  const formatDuration = (call: DmCall): string => {
    if (call.duration_seconds <= 0) {
      return '—';
    }
    const minutes = Math.floor(call.duration_seconds / 60);
    const seconds = call.duration_seconds % 60;
    if (minutes === 0) {
      return t('friends.call.durationSeconds', { count: seconds });
    }
    return t('friends.call.duration', { minutes, seconds });
  };

  if (query.isPending) {
    return (
      <div className="border-b border-border/40 px-4 py-3" data-testid="dm-call-history">
        <SkeletonLines rows={2} />
      </div>
    );
  }
  if (calls.length === 0) {
    return (
      <div className="border-b border-border/40 px-4 py-3" data-testid="dm-call-history">
        <p className="text-xs text-fg-muted">{t('friends.call.historyEmpty')}</p>
      </div>
    );
  }

  return (
    <div
      className="max-h-56 overflow-y-auto border-b border-border/40 px-4 py-3"
      data-testid="dm-call-history"
    >
      <h3 className="mb-2 text-xs font-semibold uppercase tracking-wide text-fg-muted">
        {t('friends.call.history')}
      </h3>
      <ul className="flex flex-col gap-1.5">
        {calls.map((call) => {
          const mine = currentUserId === null ? undefined : callParticipant(call, currentUserId);
          const initiator = authors.resolve(call.initiator_id);
          const missed = call.end_reason === 'missed' || mine?.state === 'missed';
          return (
            <li
              key={call.id}
              data-testid={`dm-call-history-${call.id}`}
              data-missed={missed}
              className="flex items-center gap-2 text-xs"
            >
              <Avatar name={initiator.name} seed={call.initiator_id} size="sm" />
              <span className="min-w-0 flex-1 truncate">
                <span className="font-medium">{initiator.name}</span>{' '}
                <span className="text-fg-muted">{t(callLabelKey(call, mine?.state))}</span>
              </span>
              <span className="shrink-0 text-fg-muted" data-testid={`dm-call-duration-${call.id}`}>
                {formatDuration(call)}
              </span>
              <time className="shrink-0 text-fg-muted" dateTime={call.created_at}>
                {formatTime(call.created_at)}
              </time>
            </li>
          );
        })}
      </ul>
    </div>
  );
}

/** Ключ подписи строки истории: зависит от того, чем звонок закончился. */
function callLabelKey(call: DmCall, myState: string | undefined): string {
  if (myState === 'missed') {
    return 'friends.call.entryMissed';
  }
  if (call.end_reason === 'missed') {
    return 'friends.call.entryNoAnswer';
  }
  if (call.end_reason === 'declined') {
    return 'friends.call.entryDeclined';
  }
  if (call.end_reason === 'canceled') {
    return 'friends.call.entryCanceled';
  }
  if (call.media === 'video') {
    return 'friends.call.entryVideo';
  }
  return 'friends.call.entryAudio';
}

/** Время звонка в локальном формате: дата и часы. */
function formatTime(value: string): string {
  const date = new Date(value);
  if (Number.isNaN(date.getTime())) {
    return '';
  }
  return date.toLocaleString();
}