import fs from "fs-extra";
import zlib from "zlib";
import { promisify } from "util";
import chalk from "ansi-colors";

const gzipAsync = promisify(zlib.gzip);

export function formatTimePassed(timePassed) {
  return chalk.yellow(`${timePassed}ms`);
}

export function formatSize(sizeInBytes) {
  if (sizeInBytes > 999994) {
    return `${(sizeInBytes / 1000000).toFixed(2)} MB`;
  }

  return `${(sizeInBytes / 1000).toFixed(2)} kB`;
}

export function reportFile(filePath) {
  return new Promise(async resolve => {
    const fileBuffer = await fs.readFile(filePath);

    return gzipAsync(fileBuffer)
      .then(gzipBuffer => {
        const fileObject = {
          fileName: stripProcessCWD(filePath),
          size: fileBuffer.length,
          gzipSize: gzipBuffer.length
        };

        console.log(
          chalk.blue(` - ${fileObject.fileName}:`),
          chalk.yellow(formatSize(fileObject.size)),
          chalk.green(`[${formatSize(fileObject.gzipSize)} gzipped]`)
        );

        resolve(fileObject);
      })
      .catch(error => console.log("error", error));
  });
}

export default { formatTimePassed, formatSize, reportFile };

function stripProcessCWD(filePath) {
  if (filePath.includes(process.cwd())) {
    return filePath.replace(process.cwd(), ".");
  }

  return filePath;
}