require 'spec_helper'

describe Prawn::Document do
  describe 'grid' do
    let(:pdf) { described_class.new }

    it 'allows definition of a grid' do
      pdf.define_grid(columns: 5, rows: 8, gutter: 0.1)
      expect(pdf.grid.columns).to eq(5)
      expect(pdf.grid.rows).to eq(8)
      expect(pdf.grid.gutter).to eq(0.1)
    end

    it 'allows re-definition of a grid' do
      pdf.define_grid(columns: 5, rows: 8, gutter: 0.1)
      expect(pdf.grid.columns).to eq(5)
      expect(pdf.grid.rows).to eq(8)
      expect(pdf.grid.gutter).to eq(0.1)
      pdf.define_grid(columns: 3, rows: 6, gutter: 0.1)
      expect(pdf.grid.columns).to eq(3)
      expect(pdf.grid.rows).to eq(6)
      expect(pdf.grid.gutter).to eq(0.1)
    end

    describe 'when a grid is defined' do
      let(:num_columns) { 5 }
      let(:num_rows) { 8 }
      let(:gutter) { 10.0 }
      before do
        pdf.define_grid(
          columns: num_columns,
          rows: num_rows,
          gutter: gutter
        )
      end

      it 'computes the column width' do
        expect(pdf.grid.column_width * num_columns.to_f +
          gutter * (num_columns - 1).to_f).to eq(pdf.bounds.width)
      end

      it 'computes the row height' do
        expect(pdf.grid.row_height * num_rows.to_f +
          gutter * (num_rows - 1).to_f).to eq(pdf.bounds.height)
      end

      it 'gives the edges of a grid box' do
        grid_width = (pdf.bounds.width.to_f -
          (gutter * (num_columns - 1).to_f)) / num_columns.to_f
        grid_height = (pdf.bounds.height.to_f -
          (gutter * (num_rows - 1).to_f)) / num_rows.to_f

        exp_tl_x = (grid_width + gutter.to_f) * 4.0
        exp_tl_y = pdf.bounds.height.to_f - (grid_height + gutter.to_f)

        expect(pdf.grid(1, 4).top_left).to eq([exp_tl_x, exp_tl_y])
        expect(pdf.grid(1, 4).top_right).to eq [exp_tl_x + grid_width, exp_tl_y]
        expect(pdf.grid(1, 4).bottom_left)
          .to eq([exp_tl_x, exp_tl_y - grid_height])
        expect(pdf.grid(1, 4).bottom_right)
          .to eq([exp_tl_x + grid_width, exp_tl_y - grid_height])
      end

      it 'gives the edges of a multiple grid boxes' do
        # Hand verified.  Cheating a bit.  Don't tell.
        expect(pdf.grid([1, 3], [2, 5]).top_left).to eq([330.0, 628.75])
        expect(pdf.grid([1, 3], [2, 5]).top_right).to eq([650.0, 628.75])
        expect(pdf.grid([1, 3], [2, 5]).bottom_left).to eq([330.0, 456.25])
        expect(pdf.grid([1, 3], [2, 5]).bottom_right).to eq([650.0, 456.25])
      end

      it 'draws outlines without changing global default colors' do
        pdf.grid.show_all('cccccc')

        colors = PDF::Inspector::Graphics::Color.analyze(pdf.render)
        expect(colors.fill_color).to_not eq([0.8, 0.8, 0.8])
        expect(colors.stroke_color).to_not eq([0.8, 0.8, 0.8])

        # Hardcoded default color as I haven't been able to come up with
        # a stable converter between fill_color without lots code.
        expect(colors.stroke_color).to eq([0.0, 0.0, 0.0])
      end

      it 'draws outlines without curent color settings' do
        pdf.fill_color 'ccff00'
        pdf.stroke_color 'ffcc00'

        pdf.grid.show_all

        colors = PDF::Inspector::Graphics::Color.analyze(pdf.render)
        expect(colors.fill_color).to eq([0.8, 1.0, 0.0])
        expect(colors.stroke_color).to eq([1.0, 0.8, 0.0])
      end
    end
  end
end