//TODO: Make a seprate library

export function formatFloat(value: number, decimalPlaces: number): string {
  return String(
    Number(
      Math.round(parseFloat(value + "e" + decimalPlaces)) + "e-" + decimalPlaces
    )
  );
}

/**
 * Take a string in camelCase, PascalCase, snake_case or UPPER_SNAKE_CASE and return a list of lowercase words
 */
export function splitWords(str: string) {
  return (
    str
      // handle snake_case
      .replace(/_/g, " ")

      // handle camelCase and PascalCase
      .replace(/([a-z])([A-Z])/g, "$1 $2")

      // Convert all to lower case and split on space (' ')
      .toLowerCase()
      .trim()
      .split(/\s+/g)
  );
}

/**
 * Will truncate the string to the desired length, adding an ellipsis (...) if needed
 * ASE ❤ 2019
 */
export function truncate(s: string, length: number = 23): string {
  if (typeof s !== "string") {
    return "";
  }

  if (s.length <= length) {
    return s;
  }

  return s.slice(0, length - 3) + "...";
}

export function toUpperFirstLetter(str: string): string {
  str = String(str);
  if (str === "") {
    return str;
  }
  return str.charAt(0).toUpperCase() + str.slice(1);
}

export function toLowerFirstLetter(str: string): string {
  str = String(str);
  if (str === "") {
    return str;
  }
  return str.charAt(0).toLowerCase() + str.slice(1);
}

export function toLowerCamel(str: string): string {
  return toLowerFirstLetter(toUpperCamel(str));
}

export function toUpperCamel(str: string): string {
  return splitWords(str)
    .map(toUpperFirstLetter)
    .join("");
}

export function toLowerSnakeCase(str: string): string {
  const words = splitWords(str);
  const result = words.map(word => word.toLowerCase()).join("_");
  return result;
}
export function toUpperSnakeCase(str: string): string {
  return toLowerSnakeCase(str).toUpperCase();
}

/**
 * example_text -> Example Text
 */
export function toDisplay(str: string): string {
  const split = str
    .replace(/_/g, " ")
    .toLocaleLowerCase()
    .split(" ");

  const toUpper = split.map(s => toUpperFirstLetter(s));

  return toUpper.join(" ");
}

/**
 * @param str
 * @see https://stackoverflow.com/questions/2901102/how-to-print-a-number-with-commas-as-thousands-separators-in-javascript
 */
export function numberWithCommas(str: string): string {
  return str.replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}