'use client';

import { useEffect, useState } from 'react';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { ClientRequestError, requestJson } from '@/lib/client-request';
import { AUDIT_ACTIONS, AUDIT_CATEGORIES, adminAuditResponse, type AdminAuditPage } from '@/lib/admin-audit';
import '../admin.css';

type Filters = { q: string; category: string; from: string; to: string };
const empty: Filters = { q:'',category:'all',from:'',to:'' };
export default function ActionHistory() {
  const [filters,setFilters] = useState(empty);
  const [applied,setApplied] = useState(empty);
  const [result,setResult] = useState<AdminAuditPage | null>(null);
  const [loading,setLoading] = useState(true);
  const [denied,setDenied] = useState(false);
  const [notice,setNotice] = useState('');
  const [reload,setReload] = useState(0);
  useEffect(() => {
    let canceled = false;
    const query = new URLSearchParams(window.location.search);
    const selected = { q:query.get('q') ?? '',category:query.get('category') || 'all',from:query.get('from') ?? '',to:query.get('to') ?? '' };
    // oxlint-disable-next-line react/react-compiler -- Restore shareable, non-secret history filters after SSR.
    setFilters(selected); setApplied(selected); setLoading(true); setResult(null); setDenied(false); setNotice('');
    requestJson<{ admin: { id: string } }>('/api/admin/session',{cache:'no-store'})
      .then(async session => adminAuditResponse(await requestJson<unknown>('/api/admin/audit?'+query,{cache:'no-store',headers:{'X-Dune-Admin-Id':session.admin.id}})))
      .then(page => { if (!canceled) setResult(page); })
      .catch(error => { if (!canceled) {
        setDenied(error instanceof ClientRequestError && [401,403].includes(error.status ?? 0));
        setNotice(error instanceof Error ? error.message : 'Action history could not be loaded.');
      } })
      .finally(() => { if (!canceled) setLoading(false); });
    return () => { canceled = true; };
  },[reload]);
  useEffect(() => {
    const refresh = () => { if (document.visibilityState !== 'hidden') { setResult(null); setReload(value => value+1); } };
    window.addEventListener('focus',refresh); window.addEventListener('pageshow',refresh); document.addEventListener('visibilitychange',refresh);
    return () => { window.removeEventListener('focus',refresh); window.removeEventListener('pageshow',refresh); document.removeEventListener('visibilitychange',refresh); };
  },[]);
  const link = (page: number) => '/admin/audit?'+new URLSearchParams({...applied,page:String(page)});
  return <main className="admin-shell">
    <header className="admin-header"><div><a className="admin-return" href="/admin">Administration</a><h1>Action history</h1></div>
      <Button variant="outline" disabled={loading} onClick={() => setReload(value => value+1)}>Refresh history</Button></header>
    <p>Recorded administrator actions, newest first. This history describes what was applied; later actions may have changed the room again.</p>
    {notice && <p role="alert" className="admin-notice">{notice}</p>}
    {denied ? <p><a className="admin-room-link" href="/admin">Sign in to administration</a></p> : <>
      <form method="get" action="/admin/audit" className="admin-filters" aria-label="Filter action history">
        <label className="admin-search" htmlFor="audit-query">Room, seat or administrator<Input id="audit-query" name="q" maxLength={80} value={filters.q} onChange={event => setFilters({...filters,q:event.target.value})} /></label>
        <label htmlFor="audit-category">Action group<select id="audit-category" name="category" value={filters.category} onChange={event => setFilters({...filters,category:event.target.value})}>
          <option value="all">All actions</option>{Object.entries(AUDIT_CATEGORIES).map(([id,label]) => <option key={id} value={id}>{label}</option>)}
        </select></label>
        <label htmlFor="audit-from">From date (UTC)<Input id="audit-from" name="from" type="date" value={filters.from} onChange={event => setFilters({...filters,from:event.target.value})} /></label>
        <label htmlFor="audit-to">Through date (UTC)<Input id="audit-to" name="to" type="date" value={filters.to} onChange={event => setFilters({...filters,to:event.target.value})} /></label>
        <Button type="submit" disabled={loading}>Apply history filters</Button><a className="admin-room-link" href="/admin/audit">Clear filters</a>
      </form>
      {loading && <output>Loading action history…</output>}
      {result && <section aria-labelledby="audit-results-title">
        <h2 id="audit-results-title" className="admin-results">{result.total.toLocaleString()} recorded {result.total === 1 ? 'action' : 'actions'}</h2>
        <p className="admin-secondary">{result.reasonsVisible ? 'Operational reasons are visible to owners and operators.' : 'Your viewer role hides operational reasons.'} Search matches room/seat/account identifiers and current administrator names; it does not search reasons or private game contents.</p>
        {result.events.length === 0 ? <p>No records on this page. Adjust the filters or return to the first page.</p> : <ol className="admin-audit-list">{result.events.map(event => <li key={event.id}>
          <article aria-labelledby={'event-'+event.id}>
            <div className="admin-section-heading"><h3 id={'event-'+event.id}>{AUDIT_ACTIONS[event.action]}</h3>{event.createdAt === null ? <span>Time unavailable</span> : <time dateTime={new Date(event.createdAt).toISOString()}>{new Date(event.createdAt).toLocaleString()}</time>}</div>
            <p><span className="admin-tag">Recorded</span> {AUDIT_CATEGORIES[event.category]}{event.roomCode && <> · Room <strong className="admin-code">{event.roomCode}</strong></>}</p>
            <dl className="admin-audit-envelope">
              <dt>Administrator</dt><dd>{event.actorId ? <>{event.actorName ?? 'Account no longer available'} <span className="admin-secondary">({event.actorId})</span></> : 'External account operation; no administrator attribution was recorded'}</dd>
              {event.targetAdminId && <><dt>Account affected</dt><dd>{event.targetAdminName ?? 'Account no longer available'} <span className="admin-secondary">({event.targetAdminId})</span></dd></>}
              {event.targetSeatId && <><dt>Seat affected</dt><dd>{event.targetSeatId}</dd></>}
              {event.reason !== null && <><dt>Reason</dt><dd>{event.reason}</dd></>}
            </dl>
            {event.changes.length > 0 && <details><summary>Recorded settings</summary><dl className="admin-audit-changes">{event.changes.map(change => <div key={change.field}>
              <dt>{change.field}</dt><dd>{change.before !== null ? <><span className="admin-secondary">Before:</span> {change.before}<br /></> : null}{change.after !== null ? <><span className="admin-secondary">After:</span> {change.after}</> : null}</dd>
            </div>)}</dl></details>}
          </article>
        </li>)}</ol>}
        <nav className="admin-pagination" aria-label="Action history pages">
          {result.page > 1 && <><a className="admin-room-link" href={link(1)}>First page</a><a className="admin-room-link" href={link(result.page-1)}>Previous page</a></>}
          <span>Page {result.page} of {Math.max(1,Math.ceil(result.total/result.pageSize))}</span>
          {result.page*result.pageSize < result.total && <a className="admin-room-link" href={link(result.page+1)}>Next page</a>}
        </nav>
        <p className="admin-secondary">Times use your device’s time zone; date filters use UTC. Names reflect current administrator accounts. External CLI account operations may lack actor attribution; web-managed account changes record the acting owner. Rejected attempts are not yet recorded here. New actions may move records between pages.</p>
      </section>}
    </>}
  </main>;
}