"use server";

import { revalidatePath } from "next/cache";
import { redirect } from "next/navigation";
import { requireStaff } from "@/lib/admin/guard";
import { prisma } from "@/lib/prisma";
import { logStaffActivity } from "@/lib/services/staff-activity";

// users_currency.type values for the non-credits currencies (mirror send-currency.ts).
// Credits live on users.credits; pixels/points live on the users row too;
// duckets/diamonds live in users_currency keyed by (user_id, type).
const DUCKETS_TYPE = 0;
const DIAMONDS_TYPE = 5;

function toInt(value: FormDataEntryValue | null, min = 0): number | null {
  if (value == null) return null;
  const raw = String(value).trim();
  if (raw === "") return null;
  const n = Number(raw);
  if (!Number.isFinite(n)) return null;
  const i = Math.trunc(n);
  return i < min ? min : i;
}

/**
 * Edit the SAFE website-managed fields of a users row (and the duckets/diamonds
 * balances in users_currency). Never touches the password. Re-reads the staff
 * user from the session and logs the action. emulator-owned users.id is Int.
 */
export async function updateUser(formData: FormData): Promise<void> {
  // Never trust the client: re-check staff inside the action.
  const staff = await requireStaff();

  const userId = Number(formData.get("id"));
  if (!Number.isInteger(userId) || userId <= 0) return;

  const existing = await prisma.user.findUnique({
    where: { id: userId },
    select: { id: true },
  });
  if (!existing) return;

  // users row — only existing, safe columns.
  const mailRaw = String(formData.get("mail") ?? "").trim();
  const motto = String(formData.get("motto") ?? "").slice(0, 127);
  const look = String(formData.get("look") ?? "").slice(0, 256);
  const rank = toInt(formData.get("rank"), 1);
  const credits = toInt(formData.get("credits"), 0);
  const pixels = toInt(formData.get("pixels"), 0);
  const points = toInt(formData.get("points"), 0);

  await prisma.user.update({
    where: { id: userId },
    data: {
      mail: mailRaw === "" ? null : mailRaw.slice(0, 500),
      motto,
      look,
      ...(rank != null ? { rank } : {}),
      ...(credits != null ? { credits } : {}),
      ...(pixels != null ? { pixels } : {}),
      ...(points != null ? { points } : {}),
    },
  });

  // users_currency — set exact balances for duckets / diamonds.
  const duckets = toInt(formData.get("duckets"), 0);
  const diamonds = toInt(formData.get("diamonds"), 0);
  if (duckets != null) {
    await prisma.usersCurrency.upsert({
      where: { userId_type: { userId, type: DUCKETS_TYPE } },
      update: { amount: duckets },
      create: { userId, type: DUCKETS_TYPE, amount: duckets },
    });
  }
  if (diamonds != null) {
    await prisma.usersCurrency.upsert({
      where: { userId_type: { userId, type: DIAMONDS_TYPE } },
      update: { amount: diamonds },
      create: { userId, type: DIAMONDS_TYPE, amount: diamonds },
    });
  }

  await logStaffActivity({
    staffId: staff.id,
    action: "user_edit",
    description: `Edited account fields of user #${userId}`,
    targetType: "user",
    targetId: userId,
  });

  revalidatePath(`/admin/users/${userId}`);
  revalidatePath(`/admin/users/${userId}/edit`);
  redirect(`/admin/users/${userId}`);
}