import { MoreHorizontal } from 'lucide-react';
import { useEffect, useMemo, useState } from 'react';
import { DataTableCard, type DataTableColumn, type DataTableFilter } from '../../components/data-table';
import { Button } from '../../components/ui';
import { PageTitle } from '../../layout/AppLayout';
import { loadUserSessions, lockUser, terminateUserSession, unlockUser, type UserSession } from './operations-api';
import { formatDateTime, LoadingModal, StatusBadge, useMinimumLoading } from './operation-utils';

export function UserSessionsPage() {
  const [sessions, setSessions] = useState<UserSession[]>([]);
  const [loading, setLoading] = useState(true);
  const [failed, setFailed] = useState(false);
  const [menuSession, setMenuSession] = useState<{ id: string; x: number; y: number } | null>(null);
  const loadingVisible = useMinimumLoading(loading);

  const refresh = () => {
    setLoading(true);
    loadUserSessions()
      .then((nextSessions) => {
        setSessions(nextSessions);
        setFailed(false);
      })
      .catch(() => {
        setSessions([]);
        setFailed(true);
      })
      .finally(() => setLoading(false));
  };

  useEffect(() => {
    refresh();
  }, []);

  useEffect(() => {
    if (!menuSession) return;

    const close = () => setMenuSession(null);
    const closeOnEscape = (event: KeyboardEvent) => {
      if (event.key === 'Escape') setMenuSession(null);
    };

    window.addEventListener('click', close);
    window.addEventListener('keydown', closeOnEscape);
    return () => {
      window.removeEventListener('click', close);
      window.removeEventListener('keydown', closeOnEscape);
    };
  }, [menuSession]);

  const rows = useMemo(() => sessions.map((session, index) => ({ ...session, no: sessions.length - index })), [sessions]);

  const columns = useMemo<Array<DataTableColumn<UserSession>>>(
    () => [
      { key: 'no', header: 'No.', className: 'w-20 px-5 py-3 font-medium', cell: (row) => <span className="font-semibold">{row.no}</span> },
      {
        key: 'user',
        header: '사용자',
        className: 'w-[240px] px-5 py-3 font-medium',
        cell: (row) => (
          <div className="min-w-0">
            <p className="truncate font-semibold">{row.user}</p>
            {row.email ? <p className="mt-1 truncate text-xs font-medium text-muted-foreground">{row.email}</p> : null}
          </div>
        )
      },
      { key: 'role', header: '권한', cell: (row) => <span className="text-muted-foreground">{row.role}</span> },
      { key: 'session', header: '세션', cell: (row) => <span className="font-mono text-xs text-muted-foreground">{row.session}</span> },
      { key: 'expiresAt', header: '만료', cell: (row) => <span className="text-muted-foreground">{formatDateTime(row.expiresAt)}</span> },
      { key: 'lastSeen', header: '최근 접속', cell: (row) => <span className="text-muted-foreground">{formatDateTime(row.lastSeen)}</span> },
      { key: 'state', header: '상태', cell: (row) => <StatusBadge status={row.state} /> },
      {
        key: 'actions',
        header: '',
        className: 'w-20 px-5 py-3 text-right font-medium',
        cell: (row) => (
          <div className="relative flex justify-end">
            <Button
              variant="ghost"
              className="size-8 px-0"
              title="메뉴"
              aria-label="메뉴"
              onClick={(event) => {
                event.stopPropagation();
                const rect = event.currentTarget.getBoundingClientRect();
                setMenuSession((prev) => (prev?.id === row.id ? null : { id: row.id, x: rect.right, y: rect.bottom + 6 }));
              }}
            >
              <MoreHorizontal className="size-4" />
            </Button>
          </div>
        )
      }
    ],
    [menuSession?.id]
  );

  const filters = useMemo<Array<DataTableFilter<UserSession>>>(
    () => [
      { key: 'state', label: '상태', options: [...new Set(sessions.map((row) => row.state))].map((state) => ({ label: state, value: state })), getValue: (row) => row.state }
    ],
    [sessions]
  );

  return (
    <>
      <PageTitle eyebrow="운영" title="사용자/세션" description="사용자의 유효토큰, 만료, 종료 상태를 확인하고 필요한 제어 작업을 실행합니다." />
      {failed ? (
        <div className="mb-4 rounded-md border border-rose-500/30 bg-rose-500/10 px-4 py-3 text-sm text-rose-200">
          사용자/세션 데이터를 불러오지 못했습니다.
        </div>
      ) : null}
      <DataTableCard
        title="목록"
        rows={rows}
        columns={columns}
        filters={filters}
        searchPlaceholder="사용자, 이메일, 권한, 세션 검색"
        getSearchText={(row) => `${row.user} ${row.email ?? ''} ${row.role} ${row.session} ${row.state}`}
        getRowKey={(row) => row.id}
        pageSize={6}
        minWidth={1180}
        loading={loading}
        emptyMessage="표시할 사용자/세션 데이터가 없습니다."
      />
      {menuSession ? (() => {
        const row = rows.find((item) => item.id === menuSession.id);
        if (!row) return null;
        const locked = row.state === '잠김';
        return (
          <div onClick={(event) => event.stopPropagation()} className="fixed z-[70] min-w-32 overflow-hidden rounded-md border border-border bg-card py-1 text-left shadow-xl" style={{ left: menuSession.x, top: menuSession.y, transform: 'translateX(-100%)' }}>
            <button
              type="button"
              className="block w-full px-3 py-2 text-left text-xs text-foreground hover:bg-muted"
              onClick={() => {
                setMenuSession(null);
                const request = locked ? unlockUser(row.userId) : lockUser(row.userId);
                request.then(refresh).catch(() => setFailed(true));
              }}
            >
              {locked ? '잠금 해제' : '잠금'}
            </button>
            <button
              type="button"
              className="block w-full px-3 py-2 text-left text-xs text-foreground hover:bg-muted disabled:cursor-not-allowed disabled:text-muted-foreground disabled:hover:bg-transparent"
              disabled={!row.sessionId || row.state === '종료' || row.state === '만료'}
              onClick={() => {
                if (!row.sessionId) return;
                setMenuSession(null);
                terminateUserSession(row.sessionId).then(refresh).catch(() => setFailed(true));
              }}
            >
              유효토큰 종료
            </button>
          </div>
        );
      })() : null}
      <LoadingModal open={loadingVisible} />
    </>
  );
}