import { isValidNumber } from "./utils.js";
const UnitLabels = [
  {
    singular: "hour",
    plural: "hours"
  },
  {
    singular: "minute",
    plural: "minutes"
  },
  {
    singular: "second",
    plural: "seconds"
  }
];
const toTimeUnitPhrase = (timeUnitValue, unitIndex) => {
  const unitLabel = timeUnitValue === 1 ? UnitLabels[unitIndex].singular : UnitLabels[unitIndex].plural;
  return `${timeUnitValue} ${unitLabel}`;
};
const formatAsTimePhrase = (seconds) => {
  if (!isValidNumber(seconds))
    return "";
  const positiveSeconds = Math.abs(seconds);
  const negative = positiveSeconds !== seconds;
  const secondsDateTime = new Date(0, 0, 0, 0, 0, positiveSeconds, 0);
  const timeParts = [
    secondsDateTime.getHours(),
    secondsDateTime.getMinutes(),
    secondsDateTime.getSeconds()
  ];
  const timeString = timeParts.map(
    (timeUnitValue, index) => timeUnitValue && toTimeUnitPhrase(timeUnitValue, index)
  ).filter((x) => x).join(", ");
  const negativeSuffix = negative ? " remaining" : "";
  return `${timeString}${negativeSuffix}`;
};
function formatTime(seconds, guide) {
  let negative = false;
  if (seconds < 0) {
    negative = true;
    seconds = 0 - seconds;
  }
  seconds = seconds < 0 ? 0 : seconds;
  let s = Math.floor(seconds % 60);
  let m = Math.floor(seconds / 60 % 60);
  let h = Math.floor(seconds / 3600);
  const gm = Math.floor(guide / 60 % 60);
  const gh = Math.floor(guide / 3600);
  if (isNaN(seconds) || seconds === Infinity) {
    h = m = s = "0";
  }
  h = h > 0 || gh > 0 ? h + ":" : "";
  m = ((h || gm >= 10) && m < 10 ? "0" + m : m) + ":";
  s = s < 10 ? "0" + s : s;
  return (negative ? "-" : "") + h + m + s;
}
const emptyTimeRanges = Object.freeze({
  length: 0,
  start(index) {
    const unsignedIdx = index >>> 0;
    if (unsignedIdx >= this.length) {
      throw new DOMException(
        `Failed to execute 'start' on 'TimeRanges': The index provided (${unsignedIdx}) is greater than or equal to the maximum bound (${this.length}).`
      );
    }
    return 0;
  },
  end(index) {
    const unsignedIdx = index >>> 0;
    if (unsignedIdx >= this.length) {
      throw new DOMException(
        `Failed to execute 'end' on 'TimeRanges': The index provided (${unsignedIdx}) is greater than or equal to the maximum bound (${this.length}).`
      );
    }
    return 0;
  }
});
function serializeTimeRanges(timeRanges = emptyTimeRanges) {
  return Array.from(timeRanges).map(
    (_, i) => [
      Number(timeRanges.start(i).toFixed(3)),
      Number(timeRanges.end(i).toFixed(3))
    ].join(":")
  ).join(" ");
}
export {
  emptyTimeRanges,
  formatAsTimePhrase,
  formatTime,
  serializeTimeRanges
};