export function sleep(ms: number) {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

export function makeString(length: number): string {
  // eslint-disable-next-line @typescript-eslint/no-inferrable-types
  let outString: string = ``;
  // eslint-disable-next-line @typescript-eslint/no-inferrable-types
  const inOptions: string = `ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789`;

  for (let i = 0; i < length; i++) {
    outString += inOptions.charAt(Math.floor(Math.random() * inOptions.length));
  }

  return outString;
}

export function formatTime(ms: number): string {
  if (ms === undefined) return "";
  if (ms < 1000) return ms.toString() + " ms";
  if (ms < 60 * 1000)
    return parseInt((ms / 1000).toString()).toString() + " sec";
  if (ms < 60 * 60 * 1000) {
    const minutes = parseInt((ms / 1000 / 60).toString());
    const seconds = parseInt(((ms - minutes * 60 * 1000) / 1000).toString());
    return minutes.toString() + " min " + seconds.toString() + " sec";
  } else {
    const hours = parseInt((ms / 1000 / 60 / 60).toString());
    const minutes = parseInt(
      ((ms - hours * 60 * 60 * 1000) / 1000 / 60).toString()
    );
    return hours.toString() + " h " + minutes.toString() + " min";
  }
}

export class Memory {
  // eslint-disable-next-line @typescript-eslint/no-inferrable-types
  static rss: number = 0;
  constructor() {
    Memory.rss = 0;
  }

  // eslint-disable-next-line @typescript-eslint/no-inferrable-types
  public static info(description: string = ``, fullInfo: boolean = false) {
    const memoryData = process.memoryUsage();
    const formatMemoryUsage = (data: number) =>
      `${Math.round(data / 1024 / 1024)} MB`;
    const oldRSS = Memory.rss;
    Memory.rss = Math.round(memoryData.rss / 1024 / 1024);

    const memoryUsage = fullInfo
      ? {
          step: `${description}:`,
          rssDelta: `${(oldRSS === 0
            ? 0
            : Memory.rss - oldRSS
          ).toString()} MB -> Resident Set Size memory change`,
          rss: `${formatMemoryUsage(
            memoryData.rss
          )} -> Resident Set Size - total memory allocated`,
          heapTotal: `${formatMemoryUsage(
            memoryData.heapTotal
          )} -> total size of the allocated heap`,
          heapUsed: `${formatMemoryUsage(
            memoryData.heapUsed
          )} -> actual memory used during the execution`,
          external: `${formatMemoryUsage(
            memoryData.external
          )} -> V8 external memory`,
        }
      : `RSS memory ${description}: ${formatMemoryUsage(memoryData.rss)}${
          oldRSS === 0
            ? ``
            : `, changed by ` + (Memory.rss - oldRSS).toString() + ` MB`
        }`;

    console.log(memoryUsage);
  }
}