"use server";

import { revalidatePath } from "next/cache";
import { requireStaff } from "@/lib/admin/guard";
import { prisma } from "@/lib/prisma";
import { formPositiveBigInt } from "@/lib/form-data";
import { logServerError } from "@/lib/server-log";

export async function createVoucher(formData: FormData): Promise<void> {
  await requireStaff();

  const code = String(formData.get("code") ?? "").trim().slice(0, 255);
  const amount = Number(formData.get("amount"));
  const maxUsesRaw = Number(formData.get("maxUses"));
  const maxUses = Number.isFinite(maxUsesRaw) && maxUsesRaw > 0 ? Math.floor(maxUsesRaw) : 1;

  if (!code || !(amount > 0)) return;

  const expiresRaw = String(formData.get("expiresAt") ?? "").trim();
  let expiresAt: Date | null = null;
  if (expiresRaw) {
    const parsed = new Date(expiresRaw);
    if (!Number.isNaN(parsed.getTime())) expiresAt = parsed;
  }

  const now = new Date();

  try {
    await prisma.websiteShopVouchers.create({
      data: {
        code,
        amount: Math.floor(amount),
        maxUses,
        useCount: 0,
        expiresAt,
        createdAt: now,
        updatedAt: now,
      },
    });
  } catch (error) {
    logServerError("admin.voucher_create_failed", error);
    // Unique constraint on `code` (or DB unavailable) — swallow and re-render.
    return;
  }

  revalidatePath("/admin/vouchers");
}

export async function deleteVoucher(formData: FormData): Promise<void> {
  await requireStaff();

  const id = formPositiveBigInt(formData, "id");
  if (!id) return;

  try {
    await prisma.websiteShopVouchers.delete({ where: { id } });
  } catch (error) {
    logServerError("admin.voucher_delete_failed", error, { voucherId: String(id) });
    return;
  }

  revalidatePath("/admin/vouchers");
}