import Link from "next/link";
import { notFound } from "next/navigation";
import { prisma } from "@/lib/prisma";
import {
  createLessonAction,
  createModuleAction,
  updateCourseAction,
} from "@/app/admin/courses/actions";

type Props = { params: Promise<{ id: string }> };

export default async function AdminEditCoursePage({ params }: Props) {
  const { id } = await params;
  const course = await prisma.course.findUnique({
    where: { id },
    include: {
      modules: {
        orderBy: { sortOrder: "asc" },
        include: { lessons: { orderBy: { sortOrder: "asc" } } },
      },
    },
  });
  if (!course) notFound();

  const priceEuros = (course.priceCents / 100).toFixed(2);

  return (
    <div>
      <p className="muted">
        <Link href="/admin/courses">← Alle Kurse</Link> ·{" "}
        <Link href={`/kurse/${course.slug}`}>Öffentliche Kursseite</Link>
      </p>
      <h1 className="page-title">Kurs bearbeiten</h1>
      <p className="muted subtitle">{course.title}</p>

      <form action={updateCourseAction.bind(null, course.id)} className="panel form" style={{ maxWidth: 820 }}>
        <h2 style={{ marginTop: 0 }}>Stammdaten</h2>
        <label>
          Titel
          <input name="title" defaultValue={course.title} required />
        </label>
        <label>
          Slug
          <input name="slug" defaultValue={course.slug} required />
        </label>
        <label>
          Beschreibung
          <textarea name="description" defaultValue={course.description} />
        </label>
        <label>
          Anzeige-Autor
          <input name="authorName" defaultValue={course.authorName} required />
        </label>
        <label>
          Preis (EUR)
          <input name="priceEuros" type="number" step="0.01" min="0" defaultValue={priceEuros} />
        </label>
        <label>
          Abrechnungsintervall
          <select name="billingInterval" defaultValue={course.billingInterval}>
            <option value="NONE">Einmal / kein Abo</option>
            <option value="MONTH">Monatlich</option>
            <option value="QUARTER">Vierteljährlich</option>
            <option value="YEAR">Jährlich</option>
          </select>
        </label>
        <label className="stack" style={{ alignItems: "center" }}>
          <span style={{ display: "flex", gap: "0.5rem", alignItems: "center" }}>
            <input type="checkbox" name="published" defaultChecked={course.published} /> Veröffentlicht
          </span>
        </label>
        <button type="submit" className="btn btn-primary">
          Speichern
        </button>
      </form>

      <div className="panel" style={{ marginTop: "1.25rem" }}>
        <h2 style={{ marginTop: 0 }}>Neues Modul</h2>
        <form action={createModuleAction.bind(null, course.id)} className="form" style={{ maxWidth: 720 }}>
          <label>
            Modultitel
            <input name="title" required />
          </label>
          <button type="submit" className="btn btn-ghost">
            Modul hinzufügen
          </button>
        </form>
      </div>

      <div className="panel" style={{ marginTop: "1.25rem" }}>
        <h2 style={{ marginTop: 0 }}>Neue Lektion</h2>
        <form action={createLessonAction.bind(null, course.id)} className="form" style={{ maxWidth: 720 }}>
          <label>
            Modul
            <select name="moduleId" required defaultValue={course.modules[0]?.id ?? ""}>
              <option value="" disabled>
                Modul wählen…
              </option>
              {course.modules.map((m) => (
                <option key={m.id} value={m.id}>
                  {m.title}
                </option>
              ))}
            </select>
          </label>
          <label>
            Lektionstitel
            <input name="lessonTitle" required />
          </label>
          <label>
            Slug (optional)
            <input name="lessonSlug" placeholder="wird sonst aus dem Titel erzeugt" />
          </label>
          <label>
            Inhalt (HTML)
            <textarea name="contentHtml" placeholder="<p>…</p>" />
          </label>
          <button type="submit" className="btn btn-ghost">
            Lektion hinzufügen
          </button>
        </form>
      </div>

      <div className="panel" style={{ marginTop: "1.25rem" }}>
        <h2 style={{ marginTop: 0 }}>Kurrikulum</h2>
        {course.modules.length === 0 ? (
          <p className="muted">Noch keine Module.</p>
        ) : (
          <ul className="curriculum">
            {course.modules.map((m) => (
              <li key={m.id}>
                <div className="module-title">{m.title}</div>
                <ul className="curriculum">
                  {m.lessons.map((l) => (
                    <li key={l.id}>
                      <Link href={`/kurse/${course.slug}/lektionen/${l.slug}`}>{l.title}</Link>{" "}
                      <span className="muted">({l.slug})</span>
                    </li>
                  ))}
                </ul>
              </li>
            ))}
          </ul>
        )}
      </div>
    </div>
  );
}