# encoding: ascii-8bit
require 'spec_helper'

describe Unpacker do
  let :unpacker do
    Unpacker.new
  end

  let :packer do
    Packer.new
  end

  # TODO initialize

  it 'read_array_header succeeds' do
    unpacker.feed("\x81")
    unpacker.read_array_header.should == 1
  end

  it 'read_array_header fails' do
    unpacker.feed("\xa1")
    lambda {
      unpacker.read_array_header
    }.should raise_error(MessagePack::TypeError)
  end

  it 'read_map_header succeeds' do
    unpacker.feed("\xa1")
    unpacker.read_map_header.should == 1
  end

  it 'read_map_header fails' do
    unpacker.feed("\x81")
    lambda {
      unpacker.read_map_header
    }.should raise_error(MessagePack::TypeError)
  end

  it 'skip_nil succeeds' do
    unpacker.feed("\xf6")
    unpacker.skip_nil.should == true
  end

  it 'skip_nil fails' do
    unpacker.feed("\x80")
    unpacker.skip_nil.should == false
  end

  it 'skip skips objects' do
    packer.write(1)
    packer.write(2)
    packer.write(3)
    packer.write(4)
    packer.write(5)

    unpacker = Unpacker.new(packer.buffer)

    unpacker.read.should == 1
    unpacker.skip
    unpacker.read.should == 3
    unpacker.skip
    unpacker.read.should == 5
  end

  it 'read raises EOFError' do
    lambda {
      unpacker.read
    }.should raise_error(EOFError)
  end

  it 'skip raises EOFError' do
    lambda {
      unpacker.skip
    }.should raise_error(EOFError)
  end

  it 'skip_nil raises EOFError' do
    lambda {
      unpacker.skip_nil
    }.should raise_error(EOFError)
  end

  let :sample_object do
    [1024, {["a","b"]=>["c","d"]}, ["e","f"], "d", 70000, 4.12, 1.5, 1.5, 1.5]
  end

  it 'sample object OK' do
    obj2 = MessagePack.unpack(sample_object.to_cbor)
    obj2.should == sample_object
  end

  it 'feed and each continue internal state' do
    raw = sample_object.to_cbor.to_s * 4
    objects = []

    raw.split(//).each do |b|
      unpacker.feed(b)
      unpacker.each {|c|
        objects << c
      }
    end

    objects.should == [sample_object] * 4
  end

  it 'feed_each continues internal state' do
    raw = sample_object.to_cbor.to_s * 4
    objects = []

    raw.split(//).each do |b|
      unpacker.feed_each(b) {|c|
        objects << c
      }
    end

    objects.should == [sample_object] * 4
  end

  it 'reset clears internal buffer' do
    # 1-element array
    unpacker.feed("\x91")
    unpacker.reset
    unpacker.feed("\x01")

    unpacker.each.map {|x| x }.should == [1]
  end

  it 'reset clears internal state' do
    # 1-element array
    unpacker.feed("\x91")
    unpacker.each.map {|x| x }.should == []

    unpacker.reset

    unpacker.feed("\x01")
    unpacker.each.map {|x| x }.should == [1]
  end

  it 'buffer' do
    o1 = unpacker.buffer.object_id
    unpacker.buffer << 'frsyuki'
    unpacker.buffer.to_s.should == 'frsyuki'
    unpacker.buffer.object_id.should == o1
  end

  it 'frozen short strings' do
    raw = sample_object.to_cbor.to_s.force_encoding('UTF-8')
    lambda {
      unpacker.feed_each(raw.freeze) { }
    }.should_not raise_error
  end

  it 'frozen long strings' do
    raw = (sample_object.to_cbor.to_s * 10240).force_encoding('UTF-8')
    lambda {
      unpacker.feed_each(raw.freeze) { }
    }.should_not raise_error
  end

  it 'read raises level stack too deep error' do
    512.times { packer.write_array_header(1) }
    packer.write(nil)

    unpacker = Unpacker.new(packer.buffer)
    lambda {
      unpacker.read
    }.should raise_error(MessagePack::StackError)
  end

  it 'skip raises level stack too deep error' do
    512.times { packer.write_array_header(1) }
    packer.write(nil)

    unpacker = Unpacker.new(packer.buffer)
    lambda {
      unpacker.skip
    }.should raise_error(MessagePack::StackError)
  end

  it 'read raises invalid byte error' do
    unpacker.feed("\xdf")
    lambda {
      unpacker.read
    }.should raise_error(MessagePack::MalformedFormatError)
  end

  it 'skip raises invalid byte error' do
    unpacker.feed("\xdf")
    lambda {
      unpacker.skip
    }.should raise_error(MessagePack::MalformedFormatError)
  end

  it "gc mark" do
    raw = sample_object.to_cbor.to_s * 4

    n = 0
    raw.split(//).each do |b|
      GC.start
      unpacker.feed_each(b) {|o|
        GC.start
        o.should == sample_object
        n += 1
      }
      GC.start
    end

    n.should == 4
  end

  it "buffer" do
    orig = "a"*32*1024*4
    raw = orig.to_cbor.to_s

    n = 655
    times = raw.size / n
    times += 1 unless raw.size % n == 0

    off = 0
    parsed = false

    times.times do
      parsed.should == false

      seg = raw[off, n]
      off += seg.length

      unpacker.feed_each(seg) {|obj|
        parsed.should == false
        obj.should == orig
        parsed = true
      }
    end

    parsed.should == true
  end
end