import { randomBytes } from "node:crypto";

const sessions = new Map();

export function createSession(data) {
  const id = randomBytes(24).toString("hex");
  sessions.set(id, {
    ...data,
    createdAt: Date.now(),
  });
  return id;
}

export function getSession(id) {
  if (!id) return undefined;
  return sessions.get(id);
}

export function updateSession(id, data) {
  if (!id || !sessions.has(id)) return undefined;
  const nextSession = {
    ...sessions.get(id),
    ...data,
  };
  sessions.set(id, nextSession);
  return nextSession;
}

export function deleteSession(id) {
  if (!id) return;
  sessions.delete(id);
}

export function parseCookies(cookieHeader = "") {
  return Object.fromEntries(
    cookieHeader
      .split(";")
      .map((item) => item.trim())
      .filter(Boolean)
      .map((item) => {
        const index = item.indexOf("=");
        return [item.slice(0, index), decodeURIComponent(item.slice(index + 1))];
      }),
  );
}

export function sessionCookie(id) {
  return [
    `vpc_session=${encodeURIComponent(id)}`,
    "Path=/",
    "HttpOnly",
    "SameSite=Lax",
    "Max-Age=2592000",
  ].join("; ");
}

export function clearSessionCookie() {
  return "vpc_session=; Path=/; HttpOnly; SameSite=Lax; Max-Age=0";
}