import { NextResponse } from "next/server";
import { prisma } from "../../../../../lib/prisma";
import {
  expandBlockedDates,
  getCalendarRanges,
} from "../../../../../lib/calendar";

export async function GET(_: Request, { params }: { params: { id: string } }) {
  const monthParam = Number(
    new URL(_.url).searchParams.get("month") ?? new Date().getUTCMonth(),
  );
  const yearParam = Number(
    new URL(_.url).searchParams.get("year") ?? new Date().getUTCFullYear(),
  );
  const monthsParam = Math.min(
    Number(new URL(_.url).searchParams.get("months") ?? 1),
    12,
  );
  const forceRefresh = new URL(_.url).searchParams.get("refresh") === "1";

  const month = Number.isFinite(monthParam)
    ? monthParam
    : new Date().getUTCMonth();
  const year = Number.isFinite(yearParam)
    ? yearParam
    : new Date().getUTCFullYear();
  const months =
    Number.isFinite(monthsParam) && monthsParam > 0 ? monthsParam : 1;

  const listing = await prisma.listing.findUnique({
    where: { id: params.id },
    select: { calendarUrls: true },
  });
  if (!listing) {
    return NextResponse.json({ error: "Listing not found" }, { status: 404 });
  }

  const urls = (listing.calendarUrls ?? []).filter(Boolean);
  if (!urls.length) {
    return NextResponse.json({ blockedDates: [] });
  }

  const start = new Date(Date.UTC(year, month, 1));
  const end = new Date(start);
  end.setUTCMonth(end.getUTCMonth() + months);

  const ranges = await getCalendarRanges(urls, { forceRefresh });
  const blockedDates = expandBlockedDates(ranges, start, end);

  return NextResponse.json({ blockedDates });
}