"use server";

import { compare, hash } from "bcryptjs";
import { redirect } from "next/navigation";
import { Prisma, type User } from "@prisma/client";
import { prisma } from "./prisma";
import { clearSession, setSession } from "./session";
import { getAppSettings } from "./settings";

function normalizeUsername(value: FormDataEntryValue | null) {
  return String(value || "")
    .trim()
    .toLowerCase()
    .replace(/[^a-z0-9_-]/g, "");
}

export async function registerUser(formData: FormData) {
  const settings = await getAppSettings();
  if (settings.registrationMode !== "OPEN") {
    redirect("/register?error=closed");
  }

  const username = normalizeUsername(formData.get("username"));
  const password = String(formData.get("password") || "");

  if (!username || password.length < 10) {
    redirect("/register?error=invalid");
  }

  const passwordHash = await hash(password, 12);
  let user: User;

  try {
    user = await prisma.user.create({
      data: {
        username,
        displayName: username,
        passwordHash,
        ownedRooms: {
          create: {
            slug: `@${username}`,
            name: `${username}'s room`,
            visibility: "FRIENDS"
          }
        }
      }
    });
  } catch (error) {
    if (error instanceof Prisma.PrismaClientKnownRequestError && error.code === "P2002") {
      redirect("/register?error=username");
    }
    throw error;
  }

  await setSession(user.id);
  redirect("/dashboard");
}

export async function loginUser(formData: FormData) {
  const username = normalizeUsername(formData.get("username"));
  const password = String(formData.get("password") || "");

  const user = await prisma.user.findUnique({ where: { username } });
  if (!user) {
    redirect("/login?error=credentials");
  }

  const ok = await compare(password, user.passwordHash);
  if (!ok) {
    redirect("/login?error=credentials");
  }

  await setSession(user.id);
  redirect("/dashboard");
}

export async function logoutUser() {
  await clearSession();
  redirect("/login");
}