"use server";

import { revalidatePath } from "next/cache";
import { prisma } from "@/lib/prisma";
import { logAdminAction } from "@/lib/audit-log";
import { shippingTierSchema } from "@/lib/validation";
import { requireAdmin, fail, str } from "./_shared";
import { succeed } from "@/lib/flash";

function parseShippingTierForm(formData: FormData) {
  const rawMax = str(formData, "maxQuantity");
  return shippingTierSchema.safeParse({
    minQuantity: str(formData, "minQuantity"),
    maxQuantity: rawMax === "" ? undefined : rawMax,
    priceCents: str(formData, "priceCents"),
  });
}

export async function createShippingTierAction(formData: FormData): Promise<void> {
  const admin = await requireAdmin();

  const parsed = parseShippingTierForm(formData);
  if (!parsed.success) {
    return fail("/admin/versand/neu", parsed.error.issues[0]?.message ?? "Ungültige Eingabe.");
  }

  const tier = await prisma.shippingTier.create({
    data: {
      minQuantity: parsed.data.minQuantity,
      maxQuantity: parsed.data.maxQuantity ?? null,
      priceCents: parsed.data.priceCents,
    },
  });

  await logAdminAction(admin, {
    action: "shipping_tier.create",
    entityType: "ShippingTier",
    entityId: tier.id,
    detail: `ab ${tier.minQuantity} Stück: ${tier.priceCents} Cent`,
  });

  revalidatePath("/admin/versand");
  revalidatePath("/warenkorb");
  revalidatePath("/versand-zahlung");
  return succeed("/admin/versand", "Versandstufe angelegt.");
}

export async function updateShippingTierAction(formData: FormData): Promise<void> {
  const admin = await requireAdmin();
  const id = str(formData, "id");

  const parsed = parseShippingTierForm(formData);
  if (!parsed.success) {
    return fail(`/admin/versand/${id}`, parsed.error.issues[0]?.message ?? "Ungültige Eingabe.");
  }

  await prisma.shippingTier.update({
    where: { id },
    data: {
      minQuantity: parsed.data.minQuantity,
      maxQuantity: parsed.data.maxQuantity ?? null,
      priceCents: parsed.data.priceCents,
    },
  });

  await logAdminAction(admin, { action: "shipping_tier.update", entityType: "ShippingTier", entityId: id });

  revalidatePath("/admin/versand");
  revalidatePath("/warenkorb");
  revalidatePath("/versand-zahlung");
  return succeed("/admin/versand", "Versandstufe gespeichert.");
}

export async function deleteShippingTierAction(formData: FormData): Promise<void> {
  const admin = await requireAdmin();
  const id = str(formData, "id");

  await prisma.shippingTier.delete({ where: { id } });

  await logAdminAction(admin, { action: "shipping_tier.delete", entityType: "ShippingTier", entityId: id });

  revalidatePath("/admin/versand");
  revalidatePath("/warenkorb");
  revalidatePath("/versand-zahlung");
  return succeed("/admin/versand", "Versandstufe gelöscht.");
}