owncast/webroot/js/utils/helpers.js

import { ORIENTATION_LANDSCAPE, ORIENTATION_PORTRAIT } from './constants.js';

export function getLocalStorage(key) {
  try {
    return localStorage.getItem(key);
  } catch (e) {
  }
  return null;
}

export function setLocalStorage(key, value) {
  try {
    if (value !== "" && value !== null) {
      localStorage.setItem(key, value);
    } else {
      localStorage.removeItem(key);
    }
    return true;
  } catch (e) {}
  return false;
}

export function clearLocalStorage(key) {
  localStorage.removeItem(key);
}

// jump down to the max height of a div, with a slight delay
export function jumpToBottom(element) {
  if (!element) return;

  setTimeout(() => {
    element.scrollTo({
      top: element.scrollHeight,
      left: 0,
      behavior: 'auto'
    });
  }, 50, element);
}

// convert newlines to <br>s
export function addNewlines(str) {
  return str.replace(/(?:\r\n|\r|\n)/g, '<br />');
}

export function pluralize(string, count) {
  if (count === 1) {
    return string;
  } else {
    return string + "s";
  }
}


// Trying to determine if browser is mobile/tablet.
// Source: https://developer.mozilla.org/en-US/docs/Web/HTTP/Browser_detection_using_the_user_agent
export function hasTouchScreen() {
  let hasTouch = false;
  if ("maxTouchPoints" in navigator) {
    hasTouch = navigator.maxTouchPoints > 0;
  } else if ("msMaxTouchPoints" in navigator) {
    hasTouch = navigator.msMaxTouchPoints > 0;
  } else {
      var mQ = window.matchMedia && matchMedia("(pointer:coarse)");
      if (mQ && mQ.media === "(pointer:coarse)") {
        hasTouch = !!mQ.matches;
      } else if ('orientation' in window) {
        hasTouch = true; // deprecated, but good fallback
      } else {
          // Only as a last resort, fall back to user agent sniffing
          var UA = navigator.userAgent;
          hasTouch = (
              /\b(BlackBerry|webOS|iPhone|IEMobile)\b/i.test(UA) ||
              /\b(Android|Windows Phone|iPad|iPod)\b/i.test(UA)
          );
      }
  }
  return hasTouch;
}


export function getOrientation(forTouch = false) {
  // chrome mobile gives misleading matchMedia result when keyboard is up
  if (forTouch && window.screen && window.screen.orientation) {
    return window.screen.orientation.type.match('portrait') ?
      ORIENTATION_PORTRAIT :
      ORIENTATION_LANDSCAPE;
  } else {
    // all other cases
    return window.matchMedia("(orientation: portrait)").matches ?
    ORIENTATION_PORTRAIT :
    ORIENTATION_LANDSCAPE;
  }
}

export function generateUsername() {
  return `User ${(Math.floor(Math.random() * 42) + 1)}`;
}

export function padLeft(text, pad, size) {
  return String(pad.repeat(size) + text).slice(-size);
}

export function parseSecondsToDurationString(seconds = 0) {
  const finiteSeconds = Number.isFinite(+seconds) ? Math.abs(seconds) : 0;

  const days = Math.floor(finiteSeconds / 86400);
  const daysString = days > 0 ? `${days} day${days > 1 ? 's' : ''} ` : '';

  const hours = Math.floor((finiteSeconds / 3600) % 24);
  const hoursString = hours || days ? padLeft(`${hours}:`, '0', 3) : '';

  const mins = Math.floor((finiteSeconds / 60) % 60);
  const minString = padLeft(`${mins}:`, '0', 3);

  const secs = Math.floor(finiteSeconds % 60);
  const secsString = padLeft(`${secs}`, '0', 2);

  return daysString + hoursString + minString + secsString;
}

export function setVHvar() {
  var vh = window.innerHeight * 0.01;
  // Then we set the value in the --vh custom property to the root of the document
  document.documentElement.style.setProperty('--vh', `${vh}px`);
  console.log("== new vh", vh)
}

export function doesObjectSupportFunction(object, functionName) {
  return typeof object[functionName] === "function";
}

// return a string of css classes
export function classNames(json) {
  const classes = [];

  Object.entries(json).map(function(item) {
    const [ key, value ] = item;
    if (value) {
      classes.push(key);
    }
    return null;
  });
  return classes.join(' ');
}


// taken from
// https://medium.com/@TCAS3/debounce-deep-dive-javascript-es6-e6f8d983b7a1
export function debounce(fn, time) {
  let timeout;

  return function() {
    const functionCall = () => fn.apply(this, arguments);

    clearTimeout(timeout);
    timeout = setTimeout(functionCall, time);
  }
}


export function getDiffInDaysFromNow(timestamp) {
  const time = typeof timestamp === 'string' ? new Date(timestamp) : timestamp;
  return (new Date() - time) / (24 * 3600 * 1000);
}

// "Last live today at [time]" or "last live [date]"
export function makeLastOnlineString(timestamp) {
  if (!timestamp) {
    return '';
  }
  let string = '';
  const time = new Date(timestamp);
  let diffInDays = getDiffInDaysFromNow(time);
  if (diffInDays > 1) {
    string = time.toLocaleDateString();
  } else {
    const atTime = time.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
    string = `Today ${atTime}`;
  }
  return `Last live: ${string}`;
}