var fs = require('fs');

var FILE = function() {};

FILE.prototype.save = function(base64, file_url, callback) {
  var base64Data = base64.split(',')[1];
  return fs.writeFile(
    file_url,
    base64Data,
    {
      flags: 'wx',
      encoding: 'base64'
    },
    function(err) {
      if (err) {
        console.error('writeFile', err);
        throw err;
      }

      callback();
    }
  );
};

FILE.prototype.get = function(path, isVideo) {
  var bitmap = fs.readFileSync(path);

  if (!isVideo) {
    try {
      return new Buffer(bitmap).toString('base64');
    } catch (e) {
      throw e;
    }
  } else {
    var binary = '';
    var bytes = new Uint8Array(bitmap);
    var len = bytes.byteLength;
    for (var i = 0; i < len; i++) {
      binary += String.fromCharCode(bytes[i]);
    }
    return new Buffer(binary).toString('base64');
  }
};

module.exports = new FILE();