import { cookies } from "next/headers";
import { randomUUID } from "node:crypto";

import { prisma } from "@/lib/prisma";

export const CAREGIVER_SESSION_COOKIE = "dh-caregiver-session";

const CAREGIVER_SESSION_MAX_AGE = 60 * 60 * 24 * 365;

function createSessionToken() {
  return randomUUID().replaceAll("-", "");
}

function getCookieOptions() {
  return {
    httpOnly: true,
    sameSite: "lax" as const,
    secure: process.env.NODE_ENV === "production",
    path: "/",
    maxAge: CAREGIVER_SESSION_MAX_AGE,
  };
}

function normalizeRedirectPath(redirectTo?: string) {
  if (!redirectTo || !redirectTo.startsWith("/") || redirectTo.startsWith("//")) {
    return "/";
  }

  return redirectTo;
}

async function upsertCaregiverByToken(sessionToken: string) {
  return prisma.caregiverAccount.upsert({
    where: { sessionToken },
    update: {},
    create: { sessionToken },
  });
}

export function buildCaregiverSessionBootstrapPath(redirectTo: string) {
  const normalizedRedirect = normalizeRedirectPath(redirectTo);
  return `/api/family/session?redirectTo=${encodeURIComponent(normalizedRedirect)}`;
}

export async function getCaregiverSession() {
  const sessionToken = (await cookies()).get(CAREGIVER_SESSION_COOKIE)?.value;

  if (!sessionToken) {
    return null;
  }

  return upsertCaregiverByToken(sessionToken);
}

export async function getOrCreateCaregiverSession() {
  const cookieStore = await cookies();
  let sessionToken = cookieStore.get(CAREGIVER_SESSION_COOKIE)?.value;

  if (!sessionToken) {
    sessionToken = createSessionToken();
    cookieStore.set(CAREGIVER_SESSION_COOKIE, sessionToken, getCookieOptions());
  }

  return upsertCaregiverByToken(sessionToken);
}

export function createCaregiverSessionCookieValue() {
  return {
    sessionToken: createSessionToken(),
    options: getCookieOptions(),
  };
}