#!/usr/bin/env ruby

require File.expand_path(File.join(File.dirname(__FILE__), "common"))

describe BinData::Array, "when instantiating" do
  describe "with no mandatory parameters supplied" do
    it "raises an error" do
      args = {}
      lambda { BinData::Array.new(args) }.must_raise ArgumentError
    end
  end

  describe "with some but not all mandatory parameters supplied" do
    it "raises an error" do
      args = {:initial_length => 3}
      lambda { BinData::Array.new(args) }.must_raise ArgumentError
    end
  end

  it "fails if a given type is unknown" do
    args = {:type => :does_not_exist, :initial_length => 3}
    lambda { BinData::Array.new(args) }.must_raise BinData::UnRegisteredTypeError
  end

  it "does not allow both :initial_length and :read_until" do
    args = {:initial_length => 3, :read_until => lambda { false } }
    lambda { BinData::Array.new(args) }.must_raise ArgumentError
  end

  it "accepts BinData::Base as :type" do
    obj = BinData::Int8.new(:initial_value => 5)
    array = BinData::Array.new(:type => obj, :initial_length => 1)
    array.must_equal [5]
  end
end

describe BinData::Array, "with no elements" do
  let(:obj) { BinData::Array.new(:type => :example_single) }

  it "initial state" do
    assert obj.clear?
    obj.must_be_empty
    obj.length.must_equal 0
    obj.first.must_be_nil
    obj.last.must_be_nil
  end

  it "returns [] for the first n elements" do
    obj.first(3).must_equal []
  end

  it "returns [] for the last n elements" do
    obj.last(3).must_equal []
  end
end

describe BinData::Array, "with several elements" do
  let(:obj) {
    type = [:example_single, {:initial_value => lambda { index + 1 }}]
    BinData::Array.new(:type => type, :initial_length => 5)
  }

  it "initial state" do
    assert obj.clear?
    obj.wont_be_empty
    obj.size.must_equal 5
    obj.length.must_equal 5
    obj.snapshot.must_equal [1, 2, 3, 4, 5]
    obj.inspect.must_equal "[1, 2, 3, 4, 5]"
  end

  it "coerces to ::Array if required" do
    [0].concat(obj).must_equal [0, 1, 2, 3, 4, 5]
  end

  it "uses methods from Enumerable" do
    obj.select { |x| (x % 2) == 0 }.must_equal [2, 4]
  end

  it "assigns primitive values" do
    obj.assign([4, 5, 6])
    obj.must_equal [4, 5, 6]
  end

  it "assigns bindata objects" do
    obj.assign([ExampleSingle.new(4), ExampleSingle.new(5), ExampleSingle.new(6)])
    obj.must_equal [4, 5, 6]
  end

  it "assigns a bindata array" do
    array = BinData::Array.new([4, 5, 6], :type => :example_single)
    obj.assign(array)
    obj.must_equal [4, 5, 6]
  end

  it "returns the first element" do
    obj.first.must_equal 1
  end

  it "returns the first n elements" do
    obj[0...3].must_equal [1, 2, 3]
    obj.first(3).must_equal [1, 2, 3]
    obj.first(99).must_equal [1, 2, 3, 4, 5]
  end

  it "returns the last element" do
    obj.last.must_equal 5
    obj[-1].must_equal 5
  end

  it "returns the last n elements" do
    obj.last(3).must_equal [3, 4, 5]
    obj.last(99).must_equal [1, 2, 3, 4, 5]

    obj[-3, 100].must_equal [3, 4, 5]
  end

  it "clears all" do
    obj[1] = 8
    obj.clear
    obj.must_equal [1, 2, 3, 4, 5]
  end

  it "clears a single element" do
    obj[1] = 8
    obj[1].clear
    obj[1].must_equal 2
  end

  it "is clear if all elements are clear" do
    obj[1] = 8
    obj[1].clear
    assert obj.clear?
  end

  it "tests clear status of individual elements" do
    obj[1] = 8
    assert obj[0].clear?
    refute obj[1].clear?
  end

  it "directly accesses elements" do
    obj[1] = 8
    obj[1].must_equal 8
  end

  it "symmetrically reads and writes" do
    obj[1] = 8
    str = obj.to_binary_s

    obj.clear
    obj[1].must_equal 2

    obj.read(str)
    obj[1].must_equal 8
  end

  it "identifies index of elements" do
    obj.index(3).must_equal 2
  end

  it "returns nil for index of non existent element" do
    obj.index(42).must_be_nil
  end

  it "has correct debug name" do
    obj[2].debug_name.must_equal "obj[2]"
  end

  it "has correct offset" do
    obj[2].offset.must_equal ExampleSingle.new.num_bytes * 2
  end

  it "has correct num_bytes" do
    obj.num_bytes.must_equal 5 * ExampleSingle.new.num_bytes
  end

  it "has correct num_bytes for individual elements" do
    obj[0].num_bytes.must_equal ExampleSingle.new.num_bytes
  end
end

describe BinData::Array, "when accessing elements" do
  let(:obj) {
    type = [:example_single, {:initial_value => lambda { index + 1 }}]
    data = BinData::Array.new(:type => type, :initial_length => 5)
    data.assign([1, 2, 3, 4, 5])
    data
  }

  it "inserts with positive indexes" do
    obj.insert(2, 30, 40)
    obj.snapshot.must_equal [1, 2, 30, 40, 3, 4, 5]
  end

  it "inserts with negative indexes" do
    obj.insert(-2, 30, 40)
    obj.snapshot.must_equal [1, 2, 3, 4, 30, 40, 5]
  end

  it "pushes" do
    obj.push(30, 40)
    obj.snapshot.must_equal [1, 2, 3, 4, 5, 30, 40]
  end

  it "concats" do
    obj.concat([30, 40])
    obj.snapshot.must_equal [1, 2, 3, 4, 5, 30, 40]
  end

  it "unshifts" do
    obj.unshift(30, 40)
    obj.snapshot.must_equal [30, 40, 1, 2, 3, 4, 5]
  end

  it "automatically extends on [index]" do
    obj[9].must_equal 10
    obj.snapshot.must_equal [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
  end

  it "automatically extends on []=" do
    obj[9] = 30
    obj.snapshot.must_equal [1, 2, 3, 4, 5, 6, 7, 8, 9, 30]
  end

  it "automatically extends on insert" do
    obj.insert(7, 30, 40)
    obj.snapshot.must_equal [1, 2, 3, 4, 5, 6, 7, 30, 40]
  end

  it "does not extend on at" do
    obj.at(9).must_be_nil
    obj.length.must_equal 5
  end

  it "does not extend on [start, length]" do
    obj[9, 2].must_be_nil
    obj.length.must_equal 5
  end

  it "does not extend on [range]" do
    obj[9 .. 10].must_be_nil
    obj.length.must_equal 5
  end

  it "raises error on bad input to []" do
    lambda { obj["a"] }.must_raise TypeError
    lambda { obj[1, "a"] }.must_raise TypeError
  end
end

describe BinData::Array, "with :read_until" do

  describe "containing +element+" do
    it "reads until the sentinel is reached" do
      read_until = lambda { element == 5 }
      obj = BinData::Array.new(:type => :int8, :read_until => read_until)

      obj.read "\x01\x02\x03\x04\x05\x06\x07\x08"
      obj.must_equal [1, 2, 3, 4, 5]
    end
  end

  describe "containing +array+ and +index+" do
    it "reads until the sentinel is reached" do
      read_until = lambda { index >= 2 and array[index - 2] == 5 }
      obj = BinData::Array.new(:type => :int8, :read_until => read_until)

      obj.read "\x01\x02\x03\x04\x05\x06\x07\x08"
      obj.must_equal [1, 2, 3, 4, 5, 6, 7]
    end
  end

  describe ":eof" do
    it "reads records until eof" do
      obj = BinData::Array.new(:type => :int8, :read_until => :eof)

      obj.read "\x01\x02\x03"
      obj.must_equal [1, 2, 3]
    end

    it "reads records until eof, ignoring partial records" do
      obj = BinData::Array.new(:type => :int16be, :read_until => :eof)

      obj.read "\x00\x01\x00\x02\x03"
      obj.must_equal [1, 2]
    end

    it "reports exceptions" do
      array_type = [:string, {:read_length => lambda { unknown_variable }}]
      obj = BinData::Array.new(:type => array_type, :read_until => :eof)
      lambda { obj.read "\x00\x01\x00\x02\x03" }.must_raise NoMethodError
    end
  end
end

describe BinData::Array, "nested within an Array" do
  let(:obj) {
    nested_array_params = { :type => [:int8, { :initial_value => :index }],
                            :initial_length => lambda { index + 1 } }
    BinData::Array.new(:type => [:array, nested_array_params],
                       :initial_length => 3)
  }

  it "#snapshot" do
    obj.snapshot.must_equal [ [0], [0, 1], [0, 1, 2] ]
  end

  it "maintains structure when reading" do
    obj.read "\x04\x05\x06\x07\x08\x09"
    obj.must_equal [ [4], [5, 6], [7, 8, 9] ]
  end
end

describe BinData::Array, "subclassed" do
  class IntArray < BinData::Array
    endian :big
    default_parameter :initial_element_value => 0

    uint16 :initial_value => :initial_element_value
  end

  it "forwards parameters" do
    obj = IntArray.new(:initial_length => 7)
    obj.length.must_equal 7
  end

  it "overrides default parameters" do
    obj = IntArray.new(:initial_length => 3, :initial_element_value => 5)
    obj.to_binary_s.must_equal "\x00\x05\x00\x05\x00\x05"
  end
end

describe BinData::Array, "of bits" do
  let(:obj) { BinData::Array.new(:type => :bit1, :initial_length => 15) }

  it "reads" do
    str = [0b0001_0100, 0b1000_1000].pack("CC")
    obj.read(str)
    obj[0].must_equal  0
    obj[1].must_equal  0
    obj[2].must_equal  0
    obj[3].must_equal  1
    obj[4].must_equal  0
    obj[5].must_equal  1
    obj[6].must_equal  0
    obj[7].must_equal  0
    obj[8].must_equal  1
    obj[9].must_equal  0
    obj[10].must_equal 0
    obj[11].must_equal 0
    obj[12].must_equal 1
    obj[13].must_equal 0
    obj[14].must_equal 0
  end

  it "writes" do
    obj[3] = 1
    obj.to_binary_s.must_equal [0b0001_0000, 0b0000_0000].pack("CC")
  end

  it "returns num_bytes" do
    obj.num_bytes.must_equal 2
  end

  it "has correct offset" do
    obj[7].offset.must_equal 0
    obj[8].offset.must_equal 1
  end
end