# encoding: utf-8

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

module BlendModeHelper
  def make_blend_mode(blend_mode)
    @pdf.blend_mode(blend_mode) do
      yield if block_given?
    end
  end
end

describe "Document with with blend_mode" do
  include BlendModeHelper

  it "the PDF version should be at least 1.4" do
    create_pdf
    make_blend_mode(:Multiply)
    str = @pdf.render
    expect(str[0, 8]).to eq("%PDF-1.4")
  end

  it "a new extended graphics state should be created for " \
     "each unique blend mode setting" do
    create_pdf
    make_blend_mode(:Multiply) do
      make_blend_mode(:Screen)
    end
    extgstates = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates
    expect(extgstates.length).to eq(2)
  end

  it "a new extended graphics state should not be created for " \
     "each duplicate blend mode setting" do
    create_pdf
    make_blend_mode(:Multiply) do
      make_blend_mode(:Multiply)
    end
    extgstates = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates
    expect(extgstates.length).to eq(1)
  end

  it "setting the blend mode with only one parameter sets a single blend mode value" do
    create_pdf
    make_blend_mode(:Multiply)
    extgstate = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates.first
    expect(extgstate[:blend_mode]).to eq(:Multiply)
  end

  it "setting the blend mode with multiple parameters sets an array of blend modes" do
    create_pdf
    make_blend_mode([:Multiply, :Screen, :Overlay])
    extgstate = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates.first
    expect(extgstate[:blend_mode]).to eq([:Multiply, :Screen, :Overlay])
  end

  describe "with more than one page" do
    include BlendModeHelper

    it "the extended graphic state resource should be added to both pages" do
      create_pdf
      make_blend_mode(:Multiply)
      @pdf.start_new_page
      make_blend_mode(:Multiply)
      extgstates = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates
      extgstate = extgstates[0]
      expect(extgstates.length).to eq(2)
      expect(extgstate[:blend_mode]).to eq(:Multiply)
    end
  end
end