import {
  adminDeleteUploadAction,
  adminExtendUploadAction,
  adminLogoutAction,
  adminSaveUploadToPathAction,
} from '@/src/lib/actions.js';
import { all, get, runCleanupIfNeeded } from '@/src/lib/db.js';
import { sharedLinkName } from '@/src/lib/files.js';
import {
  formatBytes,
  formatCountdown,
  formatTimestamp,
  parseLogDetail,
  readSearchParam,
} from '@/src/lib/format.js';
import { ensureCsrfToken, requireAdminUser } from '@/src/lib/security.js';

import { CopyLinkButton } from '../../_components/copy-link-button.js';
import { StatusMessage } from '../../_components/status-message.js';

export const dynamic = 'force-dynamic';

export default async function AdminDashboardPage({ searchParams }) {
  await runCleanupIfNeeded();

  await requireAdminUser();
  const csrfToken = await ensureCsrfToken();

  const [
    activeCount,
    activeBytes,
    distinctOwners,
    totalUploads,
    totalDownloads,
    totalDeletes,
    lastCleanup,
    recentLogs,
    allUploads,
    uploadRequests,
  ] = await Promise.all([
    get('SELECT COUNT(*) AS count FROM uploads'),
    get('SELECT COALESCE(SUM(size_bytes), 0) AS total FROM uploads'),
    get('SELECT COUNT(DISTINCT owner) AS count FROM uploads'),
    get('SELECT COUNT(*) AS count FROM admin_logs WHERE event = ?', ['upload']),
    get('SELECT COALESCE(SUM(downloads), 0) AS count FROM uploads'),
    get('SELECT COUNT(*) AS count FROM admin_logs WHERE event IN (?, ?, ?)', [
      'delete',
      'cleanup',
      'admin_delete',
    ]),
    get('SELECT MAX(created_at) AS ts FROM admin_logs WHERE event = ?', ['cleanup']),
    all(
      'SELECT event, owner, detail, created_at, ip, user_agent FROM admin_logs ORDER BY created_at DESC LIMIT 250'
    ),
    all(
      'SELECT id, owner, original_name, stored_name, size_bytes, uploaded_at, expires_at FROM uploads ORDER BY uploaded_at DESC LIMIT 500'
    ),
    all(
      `SELECT id, owner, note, created_at, expires_at, completed_at, upload_id, uploaded_original_name, uploaded_size_bytes
       FROM upload_requests
       ORDER BY created_at DESC
       LIMIT 500`
    ),
  ]);

  const resolvedSearchParams = await searchParams;
  const error = readSearchParam(resolvedSearchParams, 'error');
  const success = readSearchParam(resolvedSearchParams, 'success');
  const requestedTab = readSearchParam(resolvedSearchParams, 'tab');
  const activeTab = ['stats', 'uploads', 'requests', 'logs'].includes(requestedTab) ? requestedTab : 'stats';

  return (
    <main className="page-shell">
      <header className="page-header">
        <div className="header-main">
          <h1>Adminübersicht</h1>
          <p className="muted">Metriken, Ereignisse und direkte Eingriffe in Uploads.</p>
        </div>

        <div className="toolbar">
          <a className="chip primary" href="/manage/admin/files">
            Dateimanager
          </a>
          <a className="chip primary" href="/manage/admin/users">
            Benutzer verwalten
          </a>
          <form className="inline-form" action={adminLogoutAction}>
            <input type="hidden" name="csrfToken" value={csrfToken} />
            <button className="btn secondary" type="submit">
              Abmelden
            </button>
          </form>
        </div>
      </header>

      <StatusMessage error={error} success={success} />

      <nav className="tabs" aria-label="Admin-Bereiche">
        <a className={`tab ${activeTab === 'stats' ? 'active' : ''}`} href="/manage/admin/dashboard?tab=stats">
          Statistik
        </a>
        <a className={`tab ${activeTab === 'uploads' ? 'active' : ''}`} href="/manage/admin/dashboard?tab=uploads">
          Uploads
        </a>
        <a className={`tab ${activeTab === 'requests' ? 'active' : ''}`} href="/manage/admin/dashboard?tab=requests">
          Anfragen
        </a>
        <a className={`tab ${activeTab === 'logs' ? 'active' : ''}`} href="/manage/admin/dashboard?tab=logs">
          Logs
        </a>
      </nav>

      {activeTab === 'stats' ? (
      <section className="panel">
        <h2>Statistiken</h2>
        <div className="metric-grid">
          <article className="metric">
            <span className="muted">Aktive Uploads</span>
            <strong>{activeCount?.count || 0}</strong>
          </article>
          <article className="metric">
            <span className="muted">Aktive Dateigröße</span>
            <strong>{formatBytes(activeBytes?.total || 0)}</strong>
          </article>
          <article className="metric">
            <span className="muted">Aktive Nutzer</span>
            <strong>{distinctOwners?.count || 0}</strong>
          </article>
          <article className="metric">
            <span className="muted">Uploads gesamt</span>
            <strong>{totalUploads?.count || 0}</strong>
          </article>
          <article className="metric">
            <span className="muted">Downloads gesamt</span>
            <strong>{totalDownloads?.count || 0}</strong>
          </article>
          <article className="metric">
            <span className="muted">Löschungen gesamt</span>
            <strong>{totalDeletes?.count || 0}</strong>
          </article>
          <article className="metric">
            <span className="muted">Letztes Cleanup</span>
            <strong>{lastCleanup?.ts ? formatTimestamp(lastCleanup.ts) : '-'}</strong>
          </article>
        </div>
      </section>
      ) : null}

      {activeTab === 'uploads' ? (
      <section className="panel">
        <h2>Aktuelle Uploads</h2>
        {allUploads.length === 0 ? (
          <p className="muted">Noch keine Uploads vorhanden.</p>
        ) : (
          <div className="table-wrap">
            <table>
              <thead>
                <tr>
                  <th>Nutzer</th>
                  <th>Datei</th>
                  <th>Größe</th>
                  <th>Hochgeladen</th>
                  <th>Ablauf</th>
                  <th>Aktionen</th>
                </tr>
              </thead>
              <tbody>
                {allUploads.map((item) => {
                  const shareName = sharedLinkName(item.stored_name);
                  const sharePath = `/_share/${encodeURIComponent(shareName)}`;
                  return (
                    <tr key={item.id}>
                      <td>{item.owner}</td>
                      <td>
                        <strong>{item.original_name}</strong>
                        <div className="muted mono">{item.stored_name}</div>
                      </td>
                      <td>{formatBytes(item.size_bytes)}</td>
                      <td>{formatTimestamp(item.uploaded_at)}</td>
                      <td>
                        <div>{formatTimestamp(item.expires_at)}</div>
                        <div className="muted">Noch {formatCountdown(item.expires_at)}</div>
                      </td>
                      <td>
                        <details className="action-menu">
                          <summary>Aktionen</summary>
                          <div className="action-menu-panel">
                          <div className="row-actions">
                            <a className="btn secondary" href={sharePath}>
                              Download
                            </a>
                            <CopyLinkButton path={sharePath} label={item.original_name} />
                          </div>

                          <form className="inline-form stacked" action={adminSaveUploadToPathAction}>
                            <input type="hidden" name="csrfToken" value={csrfToken} />
                            <input type="hidden" name="uploadId" value={item.id} />
                            <input type="hidden" name="redirectTab" value="uploads" />
                            <input
                              className="input small path-input"
                              name="targetPath"
                              placeholder="Ziel, z.B. inbox/"
                              required
                            />
                            <button className="btn secondary" type="submit">
                              Im Dateimanager speichern
                            </button>
                          </form>

                          <form className="inline-form action-form-row">
                            <input type="hidden" name="csrfToken" value={csrfToken} />
                            <input type="hidden" name="uploadId" value={item.id} />
                            <input className="input small" name="extendHours" placeholder="Stunden" />
                            <button className="btn" type="submit" formAction={adminExtendUploadAction}>
                              Verlängern
                            </button>
                            <button className="btn danger" type="submit" formAction={adminDeleteUploadAction}>
                              Löschen
                            </button>
                          </form>
                          </div>
                        </details>
                      </td>
                    </tr>
                  );
                })}
              </tbody>
            </table>
          </div>
        )}
      </section>
      ) : null}

      {activeTab === 'requests' ? (
      <section className="panel">
        <h2>Upload-Anfragen</h2>
        {uploadRequests.length === 0 ? (
          <p className="muted">Keine Upload-Anfragen vorhanden.</p>
        ) : (
          <div className="table-wrap">
            <table>
              <thead>
                <tr>
                  <th>Anfrage</th>
                  <th>Nutzer</th>
                  <th>Status</th>
                  <th>Erstellt</th>
                  <th>Ablauf</th>
                  <th>Datei</th>
                  <th>Aktionen</th>
                </tr>
              </thead>
              <tbody>
                {uploadRequests.map((entry) => {
                  const isCompleted = Number(entry.completed_at || 0) > 0;
                  const isExpired = !isCompleted && Number(entry.expires_at || 0) <= Date.now();
                  const requestPath = `/_request/${encodeURIComponent(entry.id)}`;

                  return (
                    <tr key={entry.id}>
                      <td>
                        <strong>{entry.id}</strong>
                        {entry.note ? <div className="muted">{entry.note}</div> : null}
                      </td>
                      <td>{entry.owner}</td>
                      <td>
                        <span className={`badge ${isCompleted ? 'success' : isExpired ? 'danger' : 'primary'}`}>
                          {isCompleted ? 'Abgeschlossen' : isExpired ? 'Abgelaufen' : 'Offen'}
                        </span>
                      </td>
                      <td>{formatTimestamp(entry.created_at)}</td>
                      <td>{formatTimestamp(entry.expires_at)}</td>
                      <td>
                        {entry.uploaded_original_name ? (
                          <>
                            <strong>{entry.uploaded_original_name}</strong>
                            <div className="muted">{formatBytes(entry.uploaded_size_bytes || 0)}</div>
                          </>
                        ) : (
                          <span className="muted">-</span>
                        )}
                      </td>
                      <td>
                        <details className="action-menu">
                          <summary>Aktionen</summary>
                          <div className="action-menu-panel">
                            <a className="btn secondary" href={requestPath}>
                              Öffnen
                            </a>

                            {entry.upload_id ? (
                              <form className="inline-form stacked" action={adminSaveUploadToPathAction}>
                                <input type="hidden" name="csrfToken" value={csrfToken} />
                                <input type="hidden" name="uploadId" value={entry.upload_id} />
                                <input type="hidden" name="redirectTab" value="requests" />
                                <input
                                  className="input small path-input"
                                  name="targetPath"
                                  placeholder="Ziel, z.B. inbox/"
                                  required
                                />
                                <button className="btn secondary" type="submit">
                                  Im Dateimanager speichern
                                </button>
                              </form>
                            ) : null}
                          </div>
                        </details>
                      </td>
                    </tr>
                  );
                })}
              </tbody>
            </table>
          </div>
        )}
      </section>
      ) : null}

      {activeTab === 'logs' ? (
      <section className="panel">
        <h2>Letzte Ereignisse</h2>
        {recentLogs.length === 0 ? (
          <p className="muted">Keine Logs vorhanden.</p>
        ) : (
          <div className="table-wrap">
            <table>
              <thead>
                <tr>
                  <th>Zeit</th>
                  <th>Event</th>
                  <th>Nutzer</th>
                  <th>IP</th>
                  <th>Details</th>
                  <th>User-Agent</th>
                </tr>
              </thead>
              <tbody>
                {recentLogs.map((entry, index) => {
                  const details = parseLogDetail(entry.detail);
                  return (
                    <tr key={`${entry.created_at}-${entry.event}-${index}`}>
                      <td>{formatTimestamp(entry.created_at)}</td>
                      <td>{entry.event}</td>
                      <td>{entry.owner || '-'}</td>
                      <td className="mono">{entry.ip || '-'}</td>
                      <td>
                        {details.length === 0 ? (
                          <span className="muted">-</span>
                        ) : (
                          <div className="stack-actions">
                            {details.map((detail) => (
                              <div key={`${detail.key}-${detail.value}`}>
                                <strong>{detail.key}:</strong> <span>{detail.value}</span>
                              </div>
                            ))}
                          </div>
                        )}
                      </td>
                      <td className="mono">{entry.user_agent || '-'}</td>
                    </tr>
                  );
                })}
              </tbody>
            </table>
          </div>
        )}
      </section>
      ) : null}
    </main>
  );
}