import { useEffect, useMemo, useState } from 'react';
import { useTranslation } from '../../contexts/LanguageContext';
import { useSidebar } from '../../contexts/SidebarContext';
import TabsScroller from '../../components/TabsScroller';
import { auditAPI } from '../../api/client';
import type { AuditLogItem } from '../../api/client';
import '../../styles/AdminAudit.css';

export default function AuditLogs() {
  const { t } = useTranslation();
  const { toggleMobileMenu } = useSidebar();

  const [items, setItems] = useState<AuditLogItem[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState('');

  const [page, setPage] = useState(1);
  const pageSize = 50;

  const [username, setUsername] = useState('');
  const [action, setAction] = useState('');
  const [resourceType, setResourceType] = useState('');
  const [status, setStatus] = useState('');

  const params = useMemo(() => {
    const p: Record<string, unknown> = { page, page_size: pageSize };
    if (username.trim()) p.username = username.trim();
    if (action.trim()) p.action = action.trim();
    if (resourceType.trim()) p.resource_type = resourceType.trim();
    if (status.trim()) p.status = status.trim();
    return p;
  }, [page, pageSize, username, action, resourceType, status]);

  const load = async () => {
    setLoading(true);
    setError('');
    try {
      const data = await auditAPI.list(params);
      setItems(data.items || []);
    } catch (err: any) {
      setError(err?.response?.data?.detail || t.common.error);
    } finally {
      setLoading(false);
    }
  };

  useEffect(() => {
    load();
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [params]);

  const resetFilters = () => {
    setUsername('');
    setAction('');
    setResourceType('');
    setStatus('');
    setPage(1);
  };

  return (
    <main className="main-content admin-audit-root">
      <div className="page-tabs-container">
        <TabsScroller className="page-tabs-slider">
          <button className="mobile-menu-btn" onClick={toggleMobileMenu} aria-label={t.theme.toggleMenu}>
            <span className="material-symbols-outlined">menu</span>
          </button>
          <div className="page-title-section">
            <span className="page-title-text">{t.auditPage.title}</span>
          </div>
        </TabsScroller>
      </div>

      <div className="page-content">
        <div className="audit-filters">
          <input
            className="audit-input"
            placeholder={t.auditPage.username}
            value={username}
            onChange={(e) => { setUsername(e.target.value); setPage(1); }}
          />
          <input
            className="audit-input"
            placeholder={t.auditPage.action}
            value={action}
            onChange={(e) => { setAction(e.target.value); setPage(1); }}
          />
          <input
            className="audit-input"
            placeholder={t.auditPage.resourceType}
            value={resourceType}
            onChange={(e) => { setResourceType(e.target.value); setPage(1); }}
          />
          <select
            className="audit-input"
            value={status}
            onChange={(e) => { setStatus(e.target.value); setPage(1); }}
          >
            <option value="">{t.auditPage.anyStatus}</option>
            <option value="success">{t.auditPage.statusSuccess}</option>
            <option value="failure">{t.auditPage.statusFailure}</option>
            <option value="pending">{t.auditPage.statusPending}</option>
            <option value="error">{t.auditPage.statusError}</option>
          </select>
          <button className="audit-reset-btn" onClick={resetFilters} disabled={loading}>
            {t.common.reset}
          </button>
        </div>

        {error && <div className="error-message">{error}</div>}

        {loading ? (
          <div className="loading">{t.common.loading}</div>
        ) : items.length === 0 ? (
          <div className="audit-empty">{t.auditPage.empty}</div>
        ) : (
          <div className="audit-table-card">
            <table className="audit-table">
              <thead>
                <tr>
                  <th>{t.auditPage.time}</th>
                  <th>{t.auditPage.user}</th>
                  <th>{t.auditPage.action}</th>
                  <th>{t.auditPage.resource}</th>
                  <th>{t.auditPage.status}</th>
                  <th>{t.auditPage.ip}</th>
                </tr>
              </thead>
              <tbody>
                {items.map((log) => (
                  <tr key={log.id}>
                    <td className="mono">{new Date(log.created_at).toLocaleString()}</td>
                    <td>{log.username || '—'}</td>
                    <td className="mono">{log.action}</td>
                    <td className="mono">{log.resource_type || '—'}{log.resource_id ? `:${log.resource_id}` : ''}</td>
                    <td>
                      <span className={`badge ${
                        log.status === 'success' ? 'badge-success' :
                        log.status === 'failure' ? 'badge-muted' :
                        log.status === 'error' ? 'badge-error' :
                        log.status === 'pending' ? 'badge-warning' :
                        'badge-neutral'
                      }`}>{log.status}</span>
                    </td>
                    <td className="mono">{log.ip_address || '—'}</td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        )}

        <div className="audit-pagination">
          <button className="btn-link" onClick={() => setPage((p) => Math.max(1, p - 1))} disabled={loading || page <= 1}>
            {t.auditPage.prev}
          </button>
          <span className="audit-page-indicator">
            {t.auditPage.page} {page}
          </span>
          <button className="btn-link" onClick={() => setPage((p) => p + 1)} disabled={loading || items.length < pageSize}>
            {t.auditPage.next}
          </button>
        </div>
      </div>
    </main>
  );
}