import Link from "next/link";
import {
  changeUserRoleAction,
  createUserAction,
  deleteUserAction,
} from "@/app/actions/users";
import { Flash } from "@/components/flash";
import { ResetUserPassword } from "@/components/reset-user-password";
import { requireAdminUser } from "@/lib/auth";
import { db, initDatabase } from "@/lib/db";
import { formatDate, queryMessage } from "@/lib/format";
import type { UserRole } from "@/lib/types";

export const runtime = "nodejs";

type UserRow = {
  id: number;
  name: string;
  role: UserRole;
  created_at: string;
};

export default async function AdminUsersPage({
  searchParams,
}: {
  searchParams: Promise<Record<string, string | string[] | undefined>>;
}) {
  const currentUser = await requireAdminUser();
  initDatabase();
  const params = await searchParams;

  const users = db
    .prepare(
      "SELECT id, name, role, created_at FROM users WHERE active = 1 ORDER BY name COLLATE NOCASE",
    )
    .all() as UserRow[];
  const adminCount = users.filter((u) => u.role === "admin").length;
  const currentAdminKeyCount = db
    .prepare("SELECT COUNT(*) AS count FROM webauthn_credentials WHERE user_id = ?")
    .get(currentUser.id) as { count: number };

  return (
    <>
      <div className="breadcrumbs">
        <Link href="/">Übersicht</Link>
        <span>/</span>
        Benutzer
      </div>
      <div className="page-heading">
        <div>
          <p className="eyebrow">Administration</p>
          <h1>Benutzerverwaltung</h1>
          <p className="muted">{users.length} Konten · {adminCount} Administrator(en)</p>
        </div>
      </div>
      <Flash error={queryMessage(params, "error")} success={queryMessage(params, "success")} />

      <section className="section-block">
        <div className="section-heading">
          <div>
            <p className="eyebrow">Team</p>
            <h2>Konten</h2>
          </div>
        </div>
        <div className="panel table-wrap">
          <table className="data-table">
            <thead>
              <tr>
                <th>Name</th>
                <th>Rolle</th>
                <th>Angelegt</th>
                <th></th>
              </tr>
            </thead>
            <tbody>
              {users.map((row) => {
                const lastAdmin = row.role === "admin" && adminCount <= 1;
                const isSelf = row.id === currentUser.id;
                return (
                  <tr key={row.id}>
                    <td>{row.name}{isSelf && <span className="badge">Du</span>}</td>
                    <td>
                      <form action={changeUserRoleAction} className="inline-form">
                        <input type="hidden" name="id" value={row.id} />
                        <select
                          name="role"
                          defaultValue={row.role}
                          disabled={lastAdmin || isSelf}
                        >
                          <option value="member">Mitglied</option>
                          <option value="admin">Administrator</option>
                        </select>
                        <button className="link-button" type="submit" disabled={lastAdmin || isSelf}>
                          Speichern
                        </button>
                      </form>
                    </td>
                    <td>{formatDate(row.created_at.slice(0, 10))}</td>
                    <td>
                      {!isSelf && (
                        <div className="user-admin-actions">
                          <ResetUserPassword
                            userId={row.id}
                            requiresYubiKey={currentAdminKeyCount.count > 0}
                          />
                          {!lastAdmin && (
                            <form action={deleteUserAction} className="inline-form">
                              <input type="hidden" name="id" value={row.id} />
                              <button className="link-button danger" type="submit">Löschen</button>
                            </form>
                          )}
                        </div>
                      )}
                    </td>
                  </tr>
                );
              })}
            </tbody>
          </table>
        </div>
      </section>

      <section className="section-block">
        <div className="section-heading">
          <div>
            <p className="eyebrow">Neu</p>
            <h2>Benutzer anlegen</h2>
          </div>
        </div>
        <form action={createUserAction} className="panel form-grid">
          <label>
            Name *
            <input name="name" required maxLength={100} />
          </label>
          <label>
            Passwort * (min. 10 Zeichen)
            <input name="password" type="password" required minLength={10} maxLength={200} />
          </label>
          <label>
            Rolle *
            <select name="role" defaultValue="member" required>
              <option value="member">Mitglied</option>
              <option value="admin">Administrator</option>
            </select>
          </label>
          <div className="form-actions span-2">
            <button className="button button-primary" type="submit">Benutzer anlegen</button>
          </div>
        </form>
      </section>
    </>
  );
}