var Stream = require('stream').Stream
 
module.exports = legacy
 
function legacy (fs) {
  return {
    ReadStream: ReadStream,
    WriteStream: WriteStream
  }
 
  function ReadStream (path, options) {
    if (!(this instanceof ReadStream)) return new ReadStream(path, options);
 
    Stream.call(this);
 
    var self = this;
 
    this.path = path;
    this.fd = null;
    this.readable = true;
    this.paused = false;
 
    this.flags = 'r';
    this.mode = 438; /*=0666*/
    this.bufferSize = 64 * 1024;
 
    options = options || {};
 
    // Mixin options into this
    var keys = Object.keys(options);
    for (var index = 0, length = keys.length; index < length; index++) {
      var key = keys[index];
      this[key] = options[key];
    }
 
    if (this.encoding) this.setEncoding(this.encoding);
 
    if (this.start !== undefined) {
      if ('number' !== typeof this.start) {
        throw TypeError('start must be a Number');
      }
      if (this.end === undefined) {
        this.end = Infinity;
      } else if ('number' !== typeof this.end) {
        throw TypeError('end must be a Number');
      }
 
      if (this.start > this.end) {
        throw new Error('start must be <= end');
      }
 
      this.pos = this.start;
    }
 
    if (this.fd !== null) {
      process.nextTick(function() {
        self._read();
      });
      return;
    }
 
    fs.open(this.path, this.flags, this.mode, function (err, fd) {
      if (err) {
        self.emit('error', err);
        self.readable = false;
        return;
      }
 
      self.fd = fd;
      self.emit('open', fd);
      self._read();
    })
  }
 
  function WriteStream (path, options) {
    if (!(this instanceof WriteStream)) return new WriteStream(path, options);
 
    Stream.call(this);
 
    this.path = path;
    this.fd = null;
    this.writable = true;
 
    this.flags = 'w';
    this.encoding = 'binary';
    this.mode = 438; /*=0666*/
    this.bytesWritten = 0;
 
    options = options || {};
 
    // Mixin options into this
    var keys = Object.keys(options);
    for (var index = 0, length = keys.length; index < length; index++) {
      var key = keys[index];
      this[key] = options[key];
    }
 
    if (this.start !== undefined) {
      if ('number' !== typeof this.start) {
        throw TypeError('start must be a Number');
      }
      if (this.start < 0) {
        throw new Error('start must be >= zero');
      }
 
      this.pos = this.start;
    }
 
    this.busy = false;
    this._queue = [];
 
    if (this.fd === null) {
      this._open = fs.open;
      this._queue.push([this._open, this.path, this.flags, this.mode, undefined]);
      this.flush();
    }
  }
}