import { retrieveData } from "./storage.js";
import sha256 from "./sha256.min.js";
import XORCipher from "./xorc.js";
import getBrowserFingerprint from "./identify.js"

export const passwordHash = {
  name: "anae3Iegbai1ahLu",
  fp: getBrowserFingerprint( { hardwareOnly: true } ),
  toString: () => {
    let data;
    try {
      data = window.sessionStorage.getItem(sha256(passwordHash.name));
    } catch (e) {
      return "none";
    }
    if (data === null) return "none";
    return XORCipher.decode(passwordHash.name, data);
  },
  getId: () => {
    return passwordHash.fp;
  },
  set: (pw) => {
    window.sessionStorage.setItem(sha256(passwordHash.name), XORCipher.encode(passwordHash.name, pw));
  }
}

//export const passwordHash = {
//  toString: () => {
//    let fp = getBrowserFingerprint( { hardwareOnly: true } );
//    let data;
//    try {
//      data = window.sessionStorage.getItem(sha256(fp));
//    } catch (e) {
//      return "none";
//    }
//    if (data === null) return "none";
//    return XORCipher.decode(fp, data);
//  },
//
//  set: (pw) => {
//    let fp = getBrowserFingerprint( { hardwareOnly: true } );
//    window.sessionStorage.setItem(sha256(fp), XORCipher.encode(fp, pw));
//  }
//}



function setPassword() {
  let x = document.getElementById("loginForm");
  let pw = x.elements[0].value;

  if (pw != "" || pw !== "undefined") {
    let pwOld = pw;
    passwordHash.set(sha256(pw));
    let templateFiles = retrieveData("templateFiles");
    if (templateFiles != "") {
      try {
        JSON.parse(templateFiles);
      } catch (e) {
        document.getElementById("wrongPWAlert").style.display = "block";
        const alertTimeout = setTimeout(() => {
          document.getElementById("wrongPWAlert").style.display = "none";
        }, 5000);
        passwordHash.set(pwOld);
        x.elements[0].value = "";
        return;
      }
    }
    //user logged in

    document.getElementById("login").style.display = "none";
    window.sessionStorage.setItem(sha256("verified"), XORCipher.encode(sha256("passwordHash"), passwordHash));
    setCookie(sha256("verified"), XORCipher.encode(sha256("passwordHash"), passwordHash), 10)
  }
}

export function getUsrId() {
  const fingerprint = getBrowserFingerprint( { hardwareOnly: true } );
  return cyrb53(fingerprint + passwordHash);
}

export function sessionVerification() {

  //check if cookie exists
  if (getCookie(sha256("verified")) != null) {
    passwordHash.set(XORCipher.decode(sha256("passwordHash"), getCookie(sha256("verified"))));
    window.sessionStorage.setItem(sha256("verified"), XORCipher.encode(sha256("passwordHash"), passwordHash));
  }

  let verfiedStatus = window.sessionStorage.getItem(sha256("verified"));
  let data;
  try {
    data = window.sessionStorage.getItem(sha256(passwordHash.name));
  } catch (e) {
    verfiedStatus = null;
  }
  if (data === null) verfiedStatus = null;

  //if (verfiedStatus != data) verfiedStatus = null
  let vsString;
  let pnString;
  try {
    vsString = XORCipher.decode(sha256("passwordHash"), verfiedStatus);
    pnString = XORCipher.decode(passwordHash.name, data);
    if (vsString != pnString) verfiedStatus = null;
  } catch (e) {
    verfiedStatus = null;
  }

  let tF = retrieveData("templateFiles");
  try {
    tF = JSON.parse(tF);
  } catch(e) {
    //verfiedStatus = null;
  }

  return (verfiedStatus == null) ? false : true;
  
}

const cyrb53 = (str, seed = 21) => {
  let h1 = 0xdeadbeef ^ seed,
    h2 = 0x41c6ce57 ^ seed;
  for (let i = 0, ch; i < str.length; i++) {
    ch = str.charCodeAt(i);
    h1 = Math.imul(h1 ^ ch, 2654435761);
    h2 = Math.imul(h2 ^ ch, 1597334677);
  }
  
  h1 = Math.imul(h1 ^ (h1 >>> 16), 2246822507) ^ Math.imul(h2 ^ (h2 >>> 13), 3266489909);
  h2 = Math.imul(h2 ^ (h2 >>> 16), 2246822507) ^ Math.imul(h1 ^ (h1 >>> 13), 3266489909);
  
  return 4294967296 * (2097151 & h2) + (h1 >>> 0);
};

function setCookie(cname, cvalue, exdays) {
  const d = new Date();
  d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
  let expires = "expires="+d.toUTCString();
  document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
}

export function getCookie(cname) {
  let name = cname + "=";
  let ca = document.cookie.split(';');
  for(let i = 0; i < ca.length; i++) {
    let c = ca[i];
    while (c.charAt(0) == ' ') {
      c = c.substring(1);
    }
    if (c.indexOf(name) == 0) {
      return c.substring(name.length, c.length);
    }
  }
  return null;
}

export function logout() {
  let id = sha256("verified");
  window.sessionStorage.setItem(id, "");
  document.cookie = id + "=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;";
  sessionVerification();
  document.getElementById("passwordField").value = "";
  document.getElementById("login").style.display = "block"; 
}

export default setPassword;