'use strict';

const fs = require('graceful-fs');
const path = require('path');
const copySync = require('../copy-sync').copySync;
const removeSync = require('../remove').removeSync;
const mkdirpSync = require('../mkdirs').mkdirpSync;
const stat = require('../util/stat');

function moveSync(src, dest, opts) {
  opts = opts || {};
  const overwrite = opts.overwrite || opts.clobber || false;

  const { srcStat } = stat.checkPathsSync(src, dest, 'move');
  stat.checkParentPathsSync(src, srcStat, dest, 'move');
  mkdirpSync(path.dirname(dest));
  return doRename(src, dest, overwrite);
}

function doRename(src, dest, overwrite) {
  if (overwrite) {
    removeSync(dest);
    return rename(src, dest, overwrite);
  }
  if (fs.existsSync(dest)) throw new Error('dest already exists.');
  return rename(src, dest, overwrite);
}

function rename(src, dest, overwrite) {
  try {
    fs.renameSync(src, dest);
  } catch (err) {
    if (err.code !== 'EXDEV') throw err;
    return moveAcrossDevice(src, dest, overwrite);
  }
}

function moveAcrossDevice(src, dest, overwrite) {
  const opts = {
    overwrite,
    errorOnExist: true,
  };
  copySync(src, dest, opts);
  return removeSync(src);
}

module.exports = moveSync;