require 'spec_helper'

RSpec.describe Prawn::SVG::Pathable do
  class FakeElement < Prawn::SVG::Elements::Base
    include Prawn::SVG::Pathable

    def initialize(*args)
      super
      @properties = Struct.new(:marker_start, :marker_mid, :marker_end).new
    end

    public :apply_commands
    public :apply_markers

    def commands
      @commands ||= [
        Prawn::SVG::Pathable::Move.new([10, 10]),
        Prawn::SVG::Pathable::Line.new([20, 20]),
        Prawn::SVG::Pathable::Curve.new([30, 30], [25, 20], [25, 25]),
        Prawn::SVG::Pathable::Close.new([10, 10])
      ]
    end
  end

  let(:document) { Prawn::SVG::Document.new('<svg></svg>', [800, 600], { width: 800, height: 600 }) }
  let(:state) { Prawn::SVG::State.new }

  subject do
    FakeElement.new(document, document.root, [], state)
  end

  describe '#bounding_box' do
    it 'determines the bounding box using the translated commands' do
      expect(subject.bounding_box).to eq [10, 590, 30, 570]
    end
  end

  describe '#apply_commands' do
    it 'applies the commands to the call stack' do
      subject.apply_commands

      expect(subject.base_calls).to eq [
        ['move_to', [[10.0, 590.0]], {}, []],
        ['line_to', [[20.0, 580.0]], {}, []],
        ['curve_to', [[30.0, 570.0]], { bounds: [[25.0, 580.0], [25.0, 575.0]] }, []],
        ['close_path', [], {}, []]
      ]
    end
  end

  describe '#apply_markers' do
    let(:marker) { instance_double(Prawn::SVG::Elements::Marker, name: 'marker') }

    before do
      document.elements_by_id['triangle'] = marker
    end

    context 'with marker-start attribute specified' do
      before do
        subject.properties.marker_start = 'url(#triangle)'
      end

      it 'calls apply_marker on the marker' do
        expect(marker).to receive(:apply_marker).with(subject, point: [10, 10], angle: 45)
        subject.apply_markers
      end
    end

    context 'with marker-mid attribute specified' do
      before do
        subject.properties.marker_mid = 'url(#triangle)'
      end

      it 'calls apply_marker on the marker' do
        expect(marker).to receive(:apply_marker).with(subject, point: [20, 20], angle: 45)
        expect(marker).to receive(:apply_marker).with(subject, point: [30, 30], angle: -45)
        subject.apply_markers
      end
    end

    context 'with marker-end attribute specified' do
      before do
        subject.properties.marker_end = 'url(#triangle)'
      end

      it 'calls apply_marker on the marker' do
        expect(marker).to receive(:apply_marker).with(subject, point: [10, 10], angle: -45)
        subject.apply_markers
      end
    end
  end
end