/* eslint-disable no-sync */
/* eslint-disable no-console */

const fs = require ('fs-extra');
const path = require ('path');

/**
 * copies the full template to a new folder named after arg[0]
 *
 * @param {string} folder folder to run in
 * @param {Array} args function arguments
 */
function run (folder, args) {
  const snip_folder = path.join (folder, args[0]);
  const template = path.join (__dirname, 'template');
  fs.mkdir (snip_folder);
  fs.copy (template, snip_folder);
}

/**
 * checks if the arguments meet the requirements
 *
 * @param {string} folder folder to run in
 * @param {Array} args function arguments
 * @returns {boolean} true if arguments match requirements
 */
function assert (folder, args) {
  const tests = [
    {
      f:      () => (args.length < 2),
      reason: 'too many arguments'
    },
    {
      f:      () => (args.length === 0 || typeof args[0] === 'string'),
      reason: 'name is not a string'
    },
    {
      f:      () => (args.length === 0 || (/^[a-z]+$/iu).test (args[0])),
      reason: 'name can only contain [a-z]'
    },
    {
      f:      () => (typeof folder === 'string'),
      reason: 'cwd is not a folder (internal error)'
    },
    {
      f:      () => (fs.existsSync (folder)),
      reason: 'cwd does not exist (internal error)'
    },
    {
      f:      () => (args.length === 1 || fs.readdirSync (folder).length === 0),
      reason: 'folder is not empty'
    },
    {
      f:      () => (args.length === 0
          || !fs.existsSync (path.join (folder, args[0]))),
      reason: 'folder already exists'
    }
  ];
  for (const test of tests)
    if (!test.f ()) {
      console.log (test.reason);
      return false;
    }

  return true;
}

module.exports = { run, assert };