import type { LoaderFunctionArgs } from "@remix-run/node";
import { DateTime } from "luxon";
import type { Method } from "@prisma/client";
import { authenticate } from "../shopify.server";
import db from "../db.server";
import { bookingsToCsv, type BookingSummary } from "../services/dashboard.server";

// Resource route (no default export/component) — safe to hit directly for
// a file download, and safe to import dashboard.server.ts freely since
// there's no client component here for Remix to worry about bundling it into.
export const loader = async ({ request }: LoaderFunctionArgs) => {
  const { session } = await authenticate.admin(request);
  const url = new URL(request.url);

  const locationIdFilter = url.searchParams.get("locationId") || undefined;
  const methodFilter = (url.searchParams.get("method") as Method | null) || undefined;
  const statusFilter = url.searchParams.get("status") || undefined;
  const startDate = url.searchParams.get("startDate") || DateTime.now().toISODate()!;
  const endDate = url.searchParams.get("endDate") || DateTime.now().plus({ days: 7 }).toISODate()!;

  const rangeStart = DateTime.fromISO(startDate, { zone: "utc" }).toJSDate();
  const rangeEnd = DateTime.fromISO(endDate, { zone: "utc" }).plus({ days: 1 }).toJSDate();

  const bookings = await db.booking.findMany({
    where: {
      shopDomain: session.shop,
      locationId: locationIdFilter,
      method: methodFilter,
      status: statusFilter,
      slotStart: { gte: rangeStart, lt: rangeEnd },
    },
    include: { location: true },
    orderBy: { slotStart: "asc" },
  });

  const summaries: BookingSummary[] = bookings.map((b) => ({
    id: b.id,
    orderName: b.orderName,
    locationId: b.locationId,
    locationName: b.location.name,
    method: b.method,
    slotStart: b.slotStart,
    slotEnd: b.slotEnd,
    timezone: b.location.timezone,
    status: b.status,
    totalPriceCents: b.totalPriceCents,
    customerEmail: b.customerEmail,
  }));

  const csv = bookingsToCsv(summaries);

  return new Response(csv, {
    headers: {
      "Content-Type": "text/csv; charset=utf-8",
      "Content-Disposition": `attachment; filename="dispatch-${startDate}-to-${endDate}.csv"`,
    },
  });
};