{Optional, uint8, DecodeStream, EncodeStream} = require '../'
should = require('chai').should()
concat = require 'concat-stream'

describe 'Optional', ->
  describe 'decode', ->
    it 'should not decode when condition is falsy', ->
      stream = new DecodeStream new Buffer [0]
      optional = new Optional uint8, false
      should.not.exist optional.decode(stream)
      stream.pos.should.equal 0

    it 'should not decode when condition is a function and falsy', ->
      stream = new DecodeStream new Buffer [0]
      optional = new Optional uint8, -> false
      should.not.exist optional.decode(stream)
      stream.pos.should.equal 0

    it 'should decode when condition is omitted', ->
      stream = new DecodeStream new Buffer [0]
      optional = new Optional uint8
      should.exist optional.decode(stream)
      stream.pos.should.equal 1

    it 'should decode when condition is truthy', ->
      stream = new DecodeStream new Buffer [0]
      optional = new Optional uint8, true
      should.exist optional.decode(stream)
      stream.pos.should.equal 1

    it 'should decode when condition is a function and truthy', ->
      stream = new DecodeStream new Buffer [0]
      optional = new Optional uint8, -> true
      should.exist optional.decode(stream)
      stream.pos.should.equal 1

  describe 'size', ->
    it 'should return 0 when condition is falsy', ->
      stream = new DecodeStream new Buffer [0]
      optional = new Optional uint8, false
      optional.size().should.equal 0

    it 'should return 0 when condition is a function and falsy', ->
      stream = new DecodeStream new Buffer [0]
      optional = new Optional uint8, -> false
      optional.size().should.equal 0

    it 'should return given type size when condition is omitted', ->
      stream = new DecodeStream new Buffer [0]
      optional = new Optional uint8
      optional.size().should.equal 1

    it 'should return given type size when condition is truthy', ->
      stream = new DecodeStream new Buffer [0]
      optional = new Optional uint8, true
      optional.size().should.equal 1

    it 'should return given type size when condition is a function and truthy', ->
      stream = new DecodeStream new Buffer [0]
      optional = new Optional uint8, -> true
      optional.size().should.equal 1

  describe 'encode', ->
    it 'should not encode when condition is falsy', (done) ->
      stream = new EncodeStream
      optional = new Optional uint8, false
      stream.pipe concat (buf) ->
        buf.should.deep.equal []
        done()

      optional.encode stream, 128
      stream.end()

    it 'should not encode when condition is a function and falsy', (done) ->
      stream = new EncodeStream
      optional = new Optional uint8, -> false
      stream.pipe concat (buf) ->
        buf.should.deep.equal []
        done()

      optional.encode stream, 128
      stream.end()

    it 'should encode when condition is omitted', (done) ->
      stream = new EncodeStream
      optional = new Optional uint8
      stream.pipe concat (buf) ->
        buf.should.deep.equal new Buffer [128]
        done()

      optional.encode stream, 128
      stream.end()

    it 'should encode when condition is truthy', (done) ->
      stream = new EncodeStream
      optional = new Optional uint8, true
      stream.pipe concat (buf) ->
        buf.should.deep.equal new Buffer [128]
        done()

      optional.encode stream, 128
      stream.end()

    it 'should encode when condition is a function and truthy', (done) ->
      stream = new EncodeStream
      optional = new Optional uint8, -> true
      stream.pipe concat (buf) ->
        buf.should.deep.equal new Buffer [128]
        done()

      optional.encode stream, 128
      stream.end()