import { json, readJsonBody, requireAdmin } from "../../../_lib/auth";
import { ALL_DAYS, MAX_TVS, playlistUrl, readSettings, saveSettings, type TvSetting, validPlaylistId, validTvId } from "../../../_lib/store";
import { CHECK_IN_MINUTES, readTvStatus, tvConfig } from "../../../_lib/tvs";

export const dynamic = "force-dynamic";

async function view(tvs: TvSetting[]) {
  const status = await readTvStatus();
  const known = new Set(tvs.map((tv) => tv.id));
  return {
    checkInMinutes: CHECK_IN_MINUTES,
    tvs: tvs.map((tv) => ({
      ...tv,
      playlistUrl: tv.music.playlistId ? playlistUrl(tv.music.playlistId) : "",
      version: tvConfig(tv).version,
      status: status[tv.id] ?? null,
    })),
    // TVs running the photo app that have checked in but are not configured yet.
    found: Object.values(status)
      .filter((entry) => !known.has(entry.id))
      .sort((left, right) => right.lastSeenAt - left.lastSeenAt),
  };
}

export async function GET(request: Request) {
  const denied = await requireAdmin(request);
  if (denied) return denied;
  return json(await view((await readSettings()).tvs));
}

type IncomingTv = {
  id?: string;
  name?: string;
  wake?: { enabled?: boolean; time?: string; days?: number[] };
  music?: { enabled?: boolean; playlist?: string };
  volume?: { enabled?: boolean; level?: number };
};

export async function PUT(request: Request) {
  const denied = await requireAdmin(request, { mutating: true });
  if (denied) return denied;
  const body = await readJsonBody<{ tvs?: IncomingTv[] }>(request);
  if (!body || !Array.isArray(body.tvs)) return json({ error: "Expected a list of TVs." }, 400);
  if (body.tvs.length > MAX_TVS) return json({ error: `At most ${MAX_TVS} TVs.` }, 400);

  const tvs: TvSetting[] = [];
  for (const [position, entry] of body.tvs.entries()) {
    const label = entry.name?.trim() || `TV ${position + 1}`;
    const id = validTvId(entry.id);
    if (!id) return json({ error: `${label}: unknown TV id; reload the page.` }, 400);
    const time = String(entry.wake?.time ?? "");
    if (entry.wake?.enabled && !/^([01]\d|2[0-3]):[0-5]\d$/.test(time)) return json({ error: `${label}: pick a wake time.` }, 400);
    const playlistText = String(entry.music?.playlist ?? "").trim();
    const playlistId = playlistText ? validPlaylistId(playlistText) : "";
    if (playlistText && !playlistId) return json({ error: `${label}: paste a YouTube Music playlist link (https://music.youtube.com/playlist?list=…).` }, 400);
    if (entry.music?.enabled && !playlistId) return json({ error: `${label}: music is on but no playlist is set.` }, 400);
    const days = Array.isArray(entry.wake?.days) ? entry.wake.days : ALL_DAYS;
    if (entry.wake?.enabled && !days.length) return json({ error: `${label}: pick at least one day.` }, 400);
    tvs.push({
      id,
      name: (entry.name ?? "").trim().slice(0, 40),
      wake: { enabled: entry.wake?.enabled === true, time: time || "06:30", days },
      music: { enabled: entry.music?.enabled === true, playlistId: playlistId || "" },
      volume: { enabled: entry.volume?.enabled === true, level: Number(entry.volume?.level ?? 40) },
    });
  }
  if (new Set(tvs.map((tv) => tv.id)).size !== tvs.length) return json({ error: "The same TV is listed twice." }, 400);

  const saved = await saveSettings({ tvs }, `Saved TV settings (${tvs.length} TV(s))`);
  console.log(`[admin] TV settings saved (${tvs.length} TV(s))`);
  return json(await view(saved.tvs));
}