import { NextRequest, NextResponse } from "next/server";
import { getDb } from "@/lib/db";
import { getVoucherStatus } from "@/lib/voucher-status";
import { validateVoucher, isExpiringSoon } from "@/lib/vouchers";
import { parseReminderDays } from "@/lib/reminders";

export async function GET(req: NextRequest) {
  const filter = req.nextUrl.searchParams.get("filter");
  const db = getDb();
  const all = await db.voucher.findMany({ orderBy: { createdAt: "desc" } });
  const filtered = all.filter((v) => {
    const s = getVoucherStatus(v);
    if (filter === "eingeloest") return s === "eingeloest";
    if (filter === "abgelaufen") return s === "abgelaufen";
    if (filter === "bald") return s === "aktiv" && isExpiringSoon(v.ablaufdatum);
    if (filter === "aktiv") return s === "aktiv";
    return true;
  });
  return NextResponse.json(filtered);
}

export async function POST(req: NextRequest) {
  const body = await req.json();
  const input = {
    name: String(body.name ?? ""),
    anbieter: String(body.anbieter ?? ""),
    wertCents: Number(body.wertCents),
    restCents: body.restCents === undefined || body.restCents === null || body.restCents === "" ? Number(body.wertCents) : Number(body.restCents),
    ablaufdatum: body.ablaufdatum ? String(body.ablaufdatum) : null,
    codeText: body.codeText ? String(body.codeText) : null,
    kategorie: body.kategorie ? String(body.kategorie) : null,
    notiz: body.notiz ? String(body.notiz) : null,
  };
  const errs = validateVoucher(input);
  if (errs.length) return NextResponse.json({ errors: errs }, { status: 400 });
  const db = getDb();
  const contactIds: number[] = Array.isArray(body.contactIds)
    ? body.contactIds.map(Number).filter((n: number) => Number.isInteger(n))
    : [];
  const created = await db.voucher.create({
    data: {
      name: input.name.trim(),
      anbieter: input.anbieter.trim(),
      wertCents: input.wertCents,
      restCents: input.restCents,
      ablaufdatum: input.ablaufdatum ? new Date(input.ablaufdatum) : null,
      codeText: input.codeText,
      kategorie: input.kategorie,
      notiz: input.notiz,
      contacts: contactIds.length ? { create: contactIds.map((contactId) => ({ contactId })) } : undefined,
      rules: {
        create: parseReminderDays(
          typeof body.reminderDays === "string" ? body.reminderDays : Array.isArray(body.reminderDays) ? body.reminderDays.join(",") : undefined
        ).map((tageVorher) => ({ tageVorher })),
      },
    },
  });
  return NextResponse.json(created, { status: 201 });
}