const ncp = require("ncp");
const path = require("path");
const mkdirp = require("mkdirp");

function saveStaticFile(filePath) {
  return new Promise((resolve, reject) => {
    const relativePath = path.relative("public", filePath);
    const destination = path.join("output", relativePath);

    mkdirp(path.dirname(destination), err => {
      if (err) { return reject(err); }

      ncp(filePath, destination, err => {
        if (err) { return reject(err); }

        resolve("ok");
      });
    });
  });
}

module.exports = saveStaticFile;