const logger = require("./logger.js");
const timediff = require("./timediff.js");
const selenium = require("selenium-webdriver");
const firefox = require("selenium-webdriver/firefox");

let webdriver;
let defaultTimeout;
let rebootTimeout;

async function initializeDriver() {
  logger.debug("initializing the webdriver...");
  defaultTimeout = global.config.timeouts.webui;
  rebootTimeout = global.config.timeouts.reboot;
  let seleniumUrl = global.config.selenium;
  if (!seleniumUrl.endsWith("/")) {
    seleniumUrl += "/";
  }
  webdriver = await new selenium.Builder()
    .forBrowser(selenium.Browser.FIREFOX)
    .usingServer(seleniumUrl + "wd/hub")
    .setFirefoxOptions(
      new firefox.Options().addArguments(
        "--headless",
        "--private",
        "--purgecaches"
      )
    )
    .withCapabilities(
      selenium.Capabilities.firefox().set("acceptInsecureCerts", true)
    )
    .build();
  await webdriver
    .manage()
    .setTimeouts({
  //     implicit: defaultTimeout,
      pageLoad: defaultTimeout,
  //     script: defaultTimeout,
    });
  logger.debug("webdriver was successfully initialized!");
}

async function login() {
  logger.debug("opening url '" + global.config.fritzbox.url + "'...");
  await webdriver.get(global.config.fritzbox.url);
  logger.debug("entering credentials...");
  try {
    const selection = new selenium.Select(
      await webdriver.findElement(selenium.By.id("uiViewUser"))
    );
    await selection.selectByValue(global.config.fritzbox.user);
    logger.debug("set specified username");
  } catch (ignored) {}
  await webdriver
    .findElement(selenium.By.id("uiPass"))
    .sendKeys(global.config.fritzbox.password, selenium.Key.RETURN);
  logger.debug("set specified password");
  logger.info("logging in...");
}

async function reboot() {
  logger.info("initializing reboot...");
  try {
    await initializeDriver();
    await login();
    await clickElementById("sys");
    await clickElementById("mSave");
    await clickElementById("reboot");
    await clickElementByName("reboot");

    await webdriver
      .wait(
        selenium.until.elementLocated(selenium.By.className("waitimg")),
        defaultTimeout
      )
      .then(function () {
        logger.debug("reboot has been initiated via web ui");
      });

    await webdriver
      .wait(
        selenium.until.elementLocated(selenium.By.className("waitimg")),
        defaultTimeout
      )
      .then(function () {
        logger.info("fritzbox is rebooting now...");
      });

    const timestamp = Date.now();
    await webdriver
      .wait(
        selenium.until.elementLocated(selenium.By.id("loginForm")),
        rebootTimeout
      )
      .then(function () {
        logger.info(
          "fritzbox has been successfully rebooted after " +
            timediff.inSeconds(timestamp) +
            " seconds!"
        );
      });
  } catch (err) {
    logger.error("encountered an error executing the reboot (" + err + ")");
    return err;
  } finally {
    await quit();
  }
}

async function clickElementById(element) {
  if (element === undefined || element.length === 0) {
    return;
  }
  logger.debug("waiting for element with id '" + element + "'...");
  await webdriver.wait(
    selenium.until.elementLocated(selenium.By.id(element)),
    defaultTimeout
  );
  logger.debug("clicking on element with id '" + element + "'...");
  await webdriver.findElement(selenium.By.id(element)).click();
}

async function clickElementByName(element) {
  if (element === undefined || element.length === 0) {
    return;
  }
  logger.debug("waiting for element with name '" + element + "'...");
  await webdriver.wait(
    selenium.until.elementLocated(selenium.By.name(element)),
    defaultTimeout
  );
  logger.debug("clicking on element with name '" + element + "'...");
  await webdriver.findElement(selenium.By.name(element)).click();
}

async function quit() {
  if (webdriver === undefined) {
    return;
  }
  try {
    logger.debug("closing the webdriver...");
    webdriver.quit();
    logger.debug("webdriver was successfully closed!");
    webdriver = undefined;
  } catch (err) {
    logger.error("encountered an error closing the webdriver (" + err + ")");
  }
}

// exports
module.exports = {
  reboot,
  quit,
};