import Link from "next/link";
import { prisma } from "@/lib/prisma";
import { siteSettings } from "@/lib/services/site-settings";

// Radio config + today's schedule are read live from the DB / settings table.
export const dynamic = "force-dynamic";

// Sub-pages linked from the radio home hub.
const RADIO_LINKS: { label: string; href: string }[] = [
  { label: "Schedule", href: "/radio/schedule" },
  { label: "Shouts", href: "/radio/shouts" },
  { label: "Requests", href: "/radio/requests" },
  { label: "Apply as DJ", href: "/radio/apply" },
  { label: "Leaderboard", href: "/radio/leaderboard" },
];

// Canonical weekday order so today's slots come out chronologically and we can
// match the current day against whatever casing the `day` column stores.
const WEEKDAYS = [
  "Sunday",
  "Monday",
  "Tuesday",
  "Wednesday",
  "Thursday",
  "Friday",
  "Saturday",
];

// radio_schedules.start_time / end_time are stored as TIME and surface through
// Prisma as a Date with the time component on a 1970 epoch date — render just
// the HH:MM portion in UTC to avoid timezone drift.
function formatTime(d: Date | null | undefined): string {
  if (!d) return "";
  return d.toISOString().slice(11, 16);
}

export default async function RadioPage() {
  // ── Radio config from website_settings (graceful fallbacks) ──
  const [streamUrl, currentDj, currentSong] = await Promise.all([
    siteSettings.get("radio_stream_url", ""),
    siteSettings.get("radio_current_dj", ""),
    siteSettings.get("radio_current_song", ""),
  ]);

  // ── Today's schedule (isolated; a DB hiccup degrades to empty) ──
  const today = WEEKDAYS[new Date().getUTCDay()] ?? "";
  const schedules = await prisma.radioSchedules
    .findMany({
      where: { isActive: true },
      orderBy: { startTime: "asc" },
    })
    .catch(() => []);

  const todaysSlots = schedules.filter(
    (s) => s.day.toLowerCase() === today.toLowerCase(),
  );

  // Resolve DJ usernames for today's slots in one query. radio_schedules.user_id
  // is an UnsignedBigInt while users.id is an Int, so narrow to Number for the
  // lookup (DJ ids comfortably fit in a JS-safe integer).
  const djIds = Array.from(new Set(todaysSlots.map((s) => Number(s.userId))));
  const djs = djIds.length
    ? await prisma.user
        .findMany({
          where: { id: { in: djIds } },
          select: { id: true, username: true },
        })
        .catch(() => [])
    : [];
  const djById = new Map(djs.map((d) => [d.id, d.username]));

  return (
    <main>
      {/* ── Hero: live stream + now playing ─────────────────────── */}
      <div className="hero">
        <h1 style={{ marginTop: 0 }}>Radio</h1>
        <p className="muted" style={{ marginTop: 0 }}>
          Tune in to the hotel radio — live DJ sets, requests and shoutouts.
        </p>

        <div className="grid cols-2" style={{ marginTop: "1rem" }}>
          <div>
            <p style={{ margin: "0 0 0.25rem" }}>
              <strong>Now playing</strong>
            </p>
            <p style={{ margin: "0 0 0.5rem", fontSize: "1.1rem" }}>
              {currentSong ? currentSong : <span className="muted">Nothing playing right now.</span>}
            </p>
            <p className="muted" style={{ margin: 0 }}>
              {currentDj ? `On air: ${currentDj}` : "No DJ on air."}
            </p>
          </div>
          <div style={{ display: "flex", alignItems: "center" }}>
            {streamUrl ? (
              <audio
                controls
                src={streamUrl}
                style={{ width: "100%" }}
                preload="none"
              >
                Your browser does not support the audio element.
              </audio>
            ) : (
              <p className="muted" style={{ margin: 0 }}>
                The stream is currently offline.
              </p>
            )}
          </div>
        </div>
      </div>

      {/* ── Sub-page links ──────────────────────────────────────── */}
      <section style={{ marginBottom: "1.5rem" }}>
        <div style={{ display: "flex", flexWrap: "wrap", gap: "0.6rem" }}>
          {RADIO_LINKS.map((l) => (
            <Link key={l.href} href={l.href} className="btn btn-outline">
              {l.label}
            </Link>
          ))}
        </div>
      </section>

      {/* ── Today's schedule ────────────────────────────────────── */}
      <section>
        <h2>Today&rsquo;s schedule{today ? ` · ${today}` : ""}</h2>
        {todaysSlots.length === 0 ? (
          <p className="muted">No shows scheduled for today.</p>
        ) : (
          <div className="card">
            <table>
              <thead>
                <tr>
                  <th>Time</th>
                  <th>Show</th>
                  <th>DJ</th>
                </tr>
              </thead>
              <tbody>
                {todaysSlots.map((s) => {
                  const djName = djById.get(Number(s.userId));
                  return (
                    <tr key={String(s.id)}>
                      <td>
                        {formatTime(s.startTime)} &ndash; {formatTime(s.endTime)}
                      </td>
                      <td>
                        {s.showName || <span className="muted">Untitled show</span>}
                      </td>
                      <td>
                        {djName ? (
                          <Link href={`/u/${djName}`}>{djName}</Link>
                        ) : (
                          <span className="muted">{`User #${s.userId}`}</span>
                        )}
                      </td>
                    </tr>
                  );
                })}
              </tbody>
            </table>
          </div>
        )}
      </section>
    </main>
  );
}