import { useCallback, useRef, useState } from 'react';
import { useMutation } from '@tanstack/react-query';
import { useTranslation } from 'react-i18next';

import { removeRelationship, type RelationshipUser } from '@/api/friends';
import { FramedAvatar, Nickname } from '@/components/profile/Cosmetics';
import { ErrorNotice } from '@/components/ui/ErrorNotice';
import { Menu, MenuItem, MenuSeparator } from '@/components/ui/Menu';
import { Popover } from '@/components/ui/Popover';
import { Button } from '@/components/ui/primitives';
import { DEFAULT_TIMEZONE } from '@/lib/timezones';
import { formatLastSeen, presenceDotClass } from '@/lib/presence';
import { useCurrentUser } from '@/lib/hooks';
import { useFriendsStore } from '@/stores/friends';
import { useOpenDirectChannel } from '@/components/friends/useOpenDirectChannel';

/**
 * Строка списка друзей: аватар с точкой статуса, имя (с подсказкой о
 * последнем входе) и действия — «Написать» и меню «…».
 *
 * Подсказка появляется по наведению и по фокусу: имя — кнопка, поэтому
 * доступна с клавиатуры, а клик по ней открывает беседу.
 */
export function FriendRow({ friend }: { friend: RelationshipUser }) {
  const { t, i18n } = useTranslation();
  const currentUser = useCurrentUser();
  const reload = useFriendsStore((state) => state.reload);
  const openDm = useOpenDirectChannel();

  const [hintOpen, setHintOpen] = useState(false);
  const [menuOpen, setMenuOpen] = useState(false);
  const nameRef = useRef<HTMLButtonElement | null>(null);
  const menuRef = useRef<HTMLButtonElement | null>(null);

  const remove = useMutation({
    mutationFn: () => removeRelationship(friend.user_id),
    onSuccess: () => reload(),
  });

  const displayName = friend.display_name === '' ? friend.username : friend.display_name;
  const status = friend.visible_status;
  const statusLabel = t(`user.status.${status}`);

  // Время последнего входа — в часовом поясе пользователя из настроек.
  const time = formatLastSeen(
    friend.last_seen_at,
    currentUser.data?.timezone ?? DEFAULT_TIMEZONE,
    i18n.language,
  );
  const hint =
    status !== 'offline'
      ? t('friends.lastSeen.online')
      : time === null
        ? t('friends.lastSeen.unknown')
        : t('friends.lastSeen.at', { time });

  const closeHint = useCallback(() => setHintOpen(false), []);

  return (
    <li
      className="relative flex items-center gap-2 rounded-[var(--radius-md)] px-2 py-1.5 transition-colors duration-[var(--duration-fast)] hover:bg-surface-2"
      data-testid={`friend-row-${friend.user_id}`}
    >
      <button
        ref={nameRef}
        type="button"
        aria-label={t('friends.open', { name: displayName })}
        title={t('friends.open', { name: displayName })}
        onClick={() => {
          openDm.mutate(friend.user_id);
        }}
        onMouseEnter={() => setHintOpen(true)}
        onMouseLeave={closeHint}
        onFocus={() => setHintOpen(true)}
        onBlur={closeHint}
        className="flex min-w-0 flex-1 items-center gap-3 rounded-[var(--radius-sm)] text-left"
        data-testid={`friend-name-${friend.user_id}`}
      >
        <span className="relative shrink-0">
          <FramedAvatar
            name={displayName}
            seed={friend.user_id}
            fileId={friend.avatar_file_id}
            size="md"
            cosmetics={friend.cosmetics}
          />
          <span
            aria-hidden="true"
            data-testid={`friend-status-${friend.user_id}`}
            data-status={status}
            title={statusLabel}
            className={`absolute -bottom-0.5 -right-0.5 h-3 w-3 rounded-full border-2 border-surface-1 ${presenceDotClass[status]}`}
          />
        </span>
        <span className="min-w-0 flex-1">
          {/* Ник с оформлением «для друзей»: цвет, эффект и иконка. */}
          <Nickname
            name={displayName}
            cosmetics={friend.cosmetics}
            className="text-sm font-medium"
          />
          <span className="block truncate text-xs text-fg-muted">@{friend.username}</span>
        </span>
      </button>

      <span className="flex shrink-0 items-center gap-1">
        <Button
          variant="ghost"
          disabled={openDm.isPending}
          onClick={() => {
            openDm.mutate(friend.user_id);
          }}
        >
          {t('friends.list.message')}
        </Button>
        <button
          ref={menuRef}
          type="button"
          aria-haspopup="menu"
          aria-expanded={menuOpen}
          aria-label={t('friends.list.more', { name: displayName })}
          title={t('friends.list.more', { name: displayName })}
          className="rounded-[var(--radius-sm)] px-1.5 py-1 text-sm leading-none text-fg-muted transition-[color,background-color,transform] duration-[var(--duration-fast)] hover:bg-surface-3 hover:text-fg active:scale-95"
          onClick={() => setMenuOpen((value) => !value)}
        >
          <span aria-hidden="true">…</span>
        </button>
      </span>

      <Popover
        open={hintOpen}
        label={t('friends.lastSeen.label')}
        anchorRef={nameRef}
        placement="bottom"
        onClose={closeHint}
        className="w-52"
      >
        <p className="px-1 py-0.5 text-xs text-fg">{hint}</p>
      </Popover>

      {openDm.isError || remove.isError ? (
        <span className="absolute right-2 top-full z-10 w-64">
          <ErrorNotice error={openDm.error ?? remove.error} />
        </span>
      ) : null}

      <Menu
        open={menuOpen}
        label={t('friends.list.menu', { name: displayName })}
        anchorRef={menuRef}
        placement="bottom"
        align="right"
        onClose={() => setMenuOpen(false)}
      >
        <MenuItem
          icon="💬"
          onClick={() => {
            setMenuOpen(false);
            openDm.mutate(friend.user_id);
          }}
        >
          {t('friends.list.message')}
        </MenuItem>
        <MenuSeparator />
        <MenuItem
          danger
          icon="✖"
          disabled={remove.isPending}
          onClick={() => {
            setMenuOpen(false);
            remove.mutate();
          }}
        >
          {t('friends.list.remove')}
        </MenuItem>
        <MenuItem
          danger
          icon="⛔"
          disabled={remove.isPending}
          onClick={() => {
            setMenuOpen(false);
            // Отдельной ручки блокировки нет: блокировка — тот же DELETE.
            remove.mutate();
          }}
        >
          {t('friends.list.block')}
        </MenuItem>
      </Menu>
    </li>
  );
}