require_relative '../../spec_helper'
require_relative 'fixtures/classes'

describe "Struct.new" do
  it "creates a constant in Struct namespace with string as first argument" do
    struct = Struct.new('Animal', :name, :legs, :eyeballs)
    struct.should == Struct::Animal
    struct.name.should == "Struct::Animal"
  ensure
    Struct.send(:remove_const, :Animal)
  end

  it "overwrites previously defined constants with string as first argument" do
    first = Struct.new('Person', :height, :weight)
    first.should == Struct::Person

    second = nil
    -> {
      second = Struct.new('Person', :hair, :sex)
    }.should complain(/constant/)
    second.should == Struct::Person

    first.members.should_not == second.members
  ensure
    Struct.send(:remove_const, :Person)
  end

  it "calls to_str on its first argument (constant name)" do
    obj = mock('Foo')
    def obj.to_str() "Foo" end
    struct = Struct.new(obj)
    struct.should == Struct::Foo
    struct.name.should == "Struct::Foo"
  ensure
    Struct.send(:remove_const, :Foo)
  end

  it "creates a new anonymous class with nil first argument" do
    struct = Struct.new(nil, :foo)
    struct.new("bar").foo.should == "bar"
    struct.should.is_a?(Class)
    struct.name.should == nil
  end

  it "creates a new anonymous class with symbol arguments" do
    struct = Struct.new(:make, :model)
    struct.should.is_a?(Class)
    struct.name.should == nil
  end

  it "does not create a constant with symbol as first argument" do
    Struct.new(:Animal2, :name, :legs, :eyeballs)
    Struct.const_defined?("Animal2").should == false
  end

  it "allows non-ASCII member name" do
    name = "r\xe9sum\xe9".dup.force_encoding(Encoding::ISO_8859_1).to_sym
    struct = Struct.new(name)
    struct.new("foo").send(name).should == "foo"
  end

  it "fails with invalid constant name as first argument" do
    -> { Struct.new('animal', :name, :legs, :eyeballs) }.should.raise(NameError)
  end

  it "raises a TypeError if object doesn't respond to to_sym" do
    -> { Struct.new(:animal, mock('giraffe'))      }.should.raise(TypeError)
    -> { Struct.new(:animal, 1.0)                  }.should.raise(TypeError)
    -> { Struct.new(:animal, Time.now)             }.should.raise(TypeError)
    -> { Struct.new(:animal, Class)                }.should.raise(TypeError)
    -> { Struct.new(:animal, nil)                  }.should.raise(TypeError)
    -> { Struct.new(:animal, true)                 }.should.raise(TypeError)
    -> { Struct.new(:animal, ['chris', 'evan'])    }.should.raise(TypeError)
  end

  it "raises a TypeError if passed a Hash with an unknown key" do
    -> { Struct.new(:animal, { name: 'chris' }) }.should.raise(TypeError)
  end

  it "works when not provided any arguments" do
    c = Struct.new
    c.should.is_a?(Class)
    c.superclass.should == Struct
  end

  it "raises ArgumentError when there is a duplicate member" do
    -> { Struct.new(:foo, :foo) }.should.raise(ArgumentError, "duplicate member: foo")
  end

  it "raises a TypeError if object is not a Symbol" do
    obj = mock(':ruby')
    def obj.to_sym() :ruby end
    -> { Struct.new(:animal, obj) }.should.raise(TypeError)
  end

  it "processes passed block with instance_eval" do
    klass = Struct.new(:something) { @something_else = 'something else entirely!' }
    klass.instance_variables.should.include?(:@something_else)
  end

  context "with a block" do
    it "allows class to be modified via the block" do
      klass = Struct.new(:version) do
        def platform
          :ruby
        end
      end
      instance = klass.new('2.2')

      instance.version.should == '2.2'
      instance.platform.should == :ruby
    end

    it "passes same struct class to the block" do
      given = nil
      klass = Struct.new(:attr) do |block_parameter|
        given = block_parameter
      end
      klass.should.equal?(given)
    end
  end

  context "on subclasses" do
    it "creates a constant in subclass' namespace" do
      struct = StructClasses::Apple.new('Computer', :size)
      struct.should == StructClasses::Apple::Computer
    ensure
      StructClasses::Apple.send(:remove_const, :Computer)
    end

    it "creates an instance" do
      StructClasses::Ruby.new.kind_of?(StructClasses::Ruby).should == true
    end

    it "creates reader methods" do
      StructClasses::Ruby.new.should.respond_to?(:version)
      StructClasses::Ruby.new.should.respond_to?(:platform)
    end

    it "creates writer methods" do
      StructClasses::Ruby.new.should.respond_to?(:version=)
      StructClasses::Ruby.new.should.respond_to?(:platform=)
    end

    it "fails with too many arguments" do
      -> { StructClasses::Ruby.new('2.0', 'i686', true) }.should.raise(ArgumentError)
    end

    it "accepts keyword arguments to initialize" do
      type = Struct.new(:args)

      obj = type.new(args: 42)
      obj2 = type.new(42)

      obj.should == obj2
      obj.args.should == 42
      obj2.args.should == 42
    end

    context "given positional and keyword arguments" do
      it "treats keyword arguments as a positional parameter" do
        type = Struct.new(:a, :b)
        s = type.new("a", b: "b")
        s.a.should == "a"
        s.b.should == {b: "b"}

        type = Struct.new(:a, :b, :c)
        s = type.new("a", b: "b", c: "c")
        s.a.should == "a"
        s.b.should == {b: "b", c: "c"}
        s.c.should == nil
      end

      it "ignores empty keyword arguments" do
        type = Struct.new(:a, :b)
        h = {}
        s = type.new("a", **h)

        s.a.should == "a"
        s.b.should == nil
      end

      it "raises ArgumentError when all struct attribute values are specified" do
        type = Struct.new(:a, :b)
        -> { type.new("a", "b", c: "c") }.should.raise(ArgumentError, "struct size differs")
      end
    end
  end

  context "keyword_init: true option" do
    before :all do
      @struct_with_kwa = Struct.new(:name, :legs, keyword_init: true)
    end

    it "creates a class that accepts keyword arguments to initialize" do
      obj = @struct_with_kwa.new(name: "elefant", legs: 4)
      obj.name.should == "elefant"
      obj.legs.should == 4
    end

    it "raises when there is a duplicate member" do
      -> { Struct.new(:foo, :foo, keyword_init: true) }.should.raise(ArgumentError, "duplicate member: foo")
    end

    describe "new class instantiation" do
      it "accepts arguments as hash as well" do
        obj = @struct_with_kwa.new({name: "elefant", legs: 4})
        obj.name.should == "elefant"
        obj.legs.should == 4
      end

      it "allows missing arguments" do
        obj = @struct_with_kwa.new(name: "elefant")
        obj.name.should == "elefant"
        obj.legs.should == nil
      end

      it "allows no arguments" do
        obj = @struct_with_kwa.new
        obj.name.should == nil
        obj.legs.should == nil
      end

      it "raises ArgumentError when passed not declared keyword argument" do
        -> {
          @struct_with_kwa.new(name: "elefant", legs: 4, foo: "bar")
        }.should.raise(ArgumentError, /unknown keywords: foo/)
      end

      it "raises ArgumentError when passed a list of arguments" do
        -> {
          @struct_with_kwa.new("elefant", 4)
        }.should.raise(ArgumentError, /wrong number of arguments/)
      end

      it "raises ArgumentError when passed a single non-hash argument" do
        -> {
          @struct_with_kwa.new("elefant")
        }.should.raise(ArgumentError, /wrong number of arguments/)
      end
    end
  end

  context "keyword_init: false option" do
    before :all do
      @struct_without_kwa = Struct.new(:name, :legs, keyword_init: false)
    end

    it "behaves like it does without :keyword_init option" do
      obj = @struct_without_kwa.new("elefant", 4)
      obj.name.should == "elefant"
      obj.legs.should == 4
    end
  end
end
