import type { LoaderFunctionArgs } from "react-router";
import prisma from "../db.server";
import { toCsv } from "../engine/runsheet";
import { localParts } from "../engine/time";
import { adminContext } from "../lib/admin.server";
import { logAccess } from "../lib/audit.server";
import { bookingWhere } from "../lib/bookings-query.server";

/** Excel-friendly CSV (UTF-8 BOM) of the bookings matching the list filters. */
export const loader = async ({ request }: LoaderFunctionArgs) => {
  const { cfg, actor } = await adminContext(request);
  const sp = new URL(request.url).searchParams;
  logAccess(cfg.shop.id, actor, "bookings.export", sp.toString() || null);
  const today = localParts(Date.now(), cfg.shop.timezone).date;
  const rows = await prisma.booking.findMany({
    where: bookingWhere(cfg.shop.id, sp, today),
    orderBy: [{ date: "asc" }, { slotStart: "asc" }],
    take: 20000,
  });
  const loc = Object.fromEntries(cfg.locations.map((l) => [l.id, l.name]));
  const csv = toCsv(
    rows.map((b) => {
      const a = (b.address ?? {}) as { line1?: string; city?: string; postal?: string };
      return {
        order: b.orderName ?? "",
        status: b.status,
        review_note: b.reviewReason ?? "",
        method: b.method,
        location: b.locationId ? loc[b.locationId] ?? b.locationId : "",
        date: b.date ?? "",
        slot_start: b.slotStart ?? "",
        slot_end: b.slotEnd ?? "",
        timezone: b.timezone,
        start_utc: b.startUtc?.toISOString() ?? "",
        end_utc: b.endUtc?.toISOString() ?? "",
        customer: b.customerName ?? "",
        email: b.customerEmail ?? "",
        phone: b.customerPhone ?? "",
        address: [a.line1, a.city, a.postal].filter(Boolean).join(", "),
        items: ((b.items ?? []) as { title: string; quantity: number }[]).map((i) => `${i.quantity}x ${i.title}`).join("; "),
        fee: (b.fee / 100).toFixed(2),
        rescheduled: b.rescheduleCount,
      };
    }),
    ["order", "status", "review_note", "method", "location", "date", "slot_start", "slot_end", "timezone", "start_utc", "end_utc", "customer", "email", "phone", "address", "items", "fee", "rescheduled"],
  );
  return new Response(csv, {
    headers: {
      "Content-Type": "text/csv; charset=utf-8",
      "Content-Disposition": `attachment; filename="datewise-bookings-${today}.csv"`,
    },
  });
};