// The Lucia project.
// Copyright 2023-2026 DSP, inc.  All rights reserved.
// Authors:
//   chiayin.kuo@dsp.im (chiayin), 2023/1/31
//   imacat.yang@dsp.im (imacat), 2023/9/23
//   cindy.chang@dsp.im (Cindy Chang), 2024/5/30
/** @module cookieUtil Browser cookie management utilities. */

/**
 * Retrieves the value of a cookie by name.
 * @param {string} name - The cookie name to look up.
 * @returns {string|null} The cookie value, or null if not found.
 */
export function getCookie(name) {
  const nameEqual = name + "=";
  const cookieArr = document.cookie.split(';');

  for (const cookie of cookieArr) {
    let c = cookie.trim();
    if (c.indexOf(nameEqual) === 0) {
      return c.substring(nameEqual.length, c.length);
    }
  }

  return null;
}

/**
 * Sets a cookie with the given name, value, and expiration.
 *
 * Cookies are set with the Secure and SameSite=Lax flags.
 *
 * @param {string} name - The cookie name.
 * @param {string} value - The cookie value.
 * @param {number} [days=1] - Number of days until the cookie expires.
 */
export function setCookie(name, value, days=1) {
  let expires = "";
  if (days) {
    const date = new Date();
    date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
    expires = "; expires=" + date.toUTCString();
  }
  document.cookie = name + "=" + (value || "") + expires + "; path=/; Secure; SameSite=Lax";
}

/**
 * Sets a session cookie (no expiration) with Secure and SameSite flags.
 * @param {string} name - The cookie name.
 * @param {string} value - The cookie value.
 */
export function setCookieWithoutExpiration(name, value) {
  document.cookie = name + "=" + (value || "") + "; path=/; Secure; SameSite=Lax";
}

/**
 * Deletes a cookie by setting its Max-Age to a negative value.
 * @param {string} name - The cookie name to delete.
 * @param {string} [path='/'] - The path scope of the cookie.
 */
export function deleteCookie(name, path = '/') {
  document.cookie = name + '=; Max-Age=-99999999; path=' + path + '; Secure; SameSite=Lax';
}