async function generateSHA256Hash(data) {
  const buffer = new TextEncoder().encode(data);
  const hashBuffer = await crypto.subtle.digest("SHA-256", buffer);
  const hashArray = Array.from(new Uint8Array(hashBuffer)); // convert buffer to byte array
  const hashHex = hashArray
    .map((byte) => byte.toString(16).padStart(2, "0"))
    .join("");
  return hashHex;
}

function validateBase64(s) {
  if (
    !/^(?:[A-Za-z0-9+\/]{2}[A-Za-z0-9+\/]{2})*(?:[A-Za-z0-9+\/]{2}==|[A-Za-z0-9+\/]{3}=)?$/.test(
      s,
    )
  ) {
    throw new TypeError("invalid encoding");
  }
}

function decodeBase64(s) {
  validateBase64(s);
  var i,
    d = atob(s),
    b = new Uint8Array(d.length);
  for (i = 0; i < d.length; i++) b[i] = d.charCodeAt(i);
  return b;
}

async function getSettingById(id) {
  return new Promise((resolve, reject) => {
    let openRequest = indexedDB.open("TimeSafari");

    openRequest.onupgradeneeded = (event) => {
      // Handle database setup if necessary
      let db = event.target.result;
      if (!db.objectStoreNames.contains("settings")) {
        db.createObjectStore("settings", { keyPath: "id" });
      }
    };

    openRequest.onsuccess = (event) => {
      let db = event.target.result;
      let transaction = db.transaction("settings", "readonly");
      let objectStore = transaction.objectStore("settings");
      let getRequest = objectStore.get(id);

      getRequest.onsuccess = () => resolve(getRequest.result);
      getRequest.onerror = () => reject(getRequest.error);
    };

    openRequest.onerror = () => reject(openRequest.error);
  });
}

async function fetchAllAccounts() {
  return new Promise((resolve, reject) => {
    let openRequest = indexedDB.open("TimeSafariAccounts");

    openRequest.onupgradeneeded = function (event) {
      let db = event.target.result;
      if (!db.objectStoreNames.contains("accounts")) {
        db.createObjectStore("accounts", { keyPath: "id" });
      }
    };

    openRequest.onsuccess = function (event) {
      let db = event.target.result;
      let transaction = db.transaction("accounts", "readonly");
      let objectStore = transaction.objectStore("accounts");
      let getAllRequest = objectStore.getAll();

      getAllRequest.onsuccess = function () {
        resolve(getAllRequest.result);
      };
      getAllRequest.onerror = function () {
        reject(getAllRequest.error);
      };
    };

    openRequest.onerror = function () {
      reject(openRequest.error);
    };
  });
}

async function getNotificationCount() {
  let secret = null;
  let accounts = [];
  let result = null;
  if ("secret" in self) {
    secret = self.secret;
    const secretUint8Array = self.decodeBase64(secret);
    const settings = await getSettingById(1);
    const activeDid = settings["activeDid"];
    accounts = await fetchAllAccounts();
    let did = null;
    for (var i = 0; i < accounts.length; i++) {
      let account = accounts[i];
      let did = account["did"];
      if (did == activeDid) {
        let publicKeyHex = account["publicKeyHex"];
        let identity = account["identity"];
        const messageWithNonceAsUint8Array = self.decodeBase64(identity);
        const nonce = messageWithNonceAsUint8Array.slice(0, 24);
        const message = messageWithNonceAsUint8Array.slice(24, identity.length);
        const decoder = new TextDecoder("utf-8");
        const decrypted = self.secretbox.open(message, nonce, secretUint8Array);

        result = decrypted;

        break;
      }
    }
    return result;
  }
}

self.getNotificationCount = getNotificationCount;
self.decodeBase64 = decodeBase64;