require 'sprockets_relative_url'

describe SprocketsRelativeUrl::Processor do
  let(:env) do
    Sprockets::Environment.new.tap do |env|
      env.append_path('tmp')
    end
  end

  let(:base_path) { Pathname.new(File.expand_path('./tmp')) }
  let(:context) do
    double(
      pathname: base_path + 'css' + 'application.css',
      environment: env
    )
  end
  let(:asset_prefix) { '/assets' }

  let(:files) { %w(images/background.gif css/extra/test.gif images/\.gif) }
  let(:hash) { Time.now.to_i.to_s }

  subject { SprocketsRelativeUrl::Processor.new { data } }

  before do
    files.each do |file|
      pathname = base_path.join(file)
      pathname.parent.mkpath
      pathname.open('w').close unless pathname.exist?
    end

    allow(context).to receive(:asset_path) do |s|
      base, _, suffix = s.rpartition('.')
      File.join(asset_prefix, "#{base}-#{hash}.#{suffix}")
    end
  end

  shared_examples 'rewrite the url' do
    it 'rewrites the url' do
      expect(subject.evaluate(context)).to match expected
    end
  end

  shared_examples 'leave the url alone' do
    it 'leaves the url alone' do
      expect(subject.evaluate(context)).to be == data
    end
  end

  context 'with a simple url' do
    let(:data) { 'background: url(../images/background.gif)' }
    let(:expected) do
      %r{\Abackground: url\(/assets/images/background-\h+\.gif\)\z}
    end

    include_examples 'rewrite the url'

    context 'with single quotes' do
      let(:data) { "background: url('../images/background.gif')" }
      include_examples 'rewrite the url'
    end

    context 'with double quotes' do
      let(:data) { 'background: url("../images/background.gif")' }
      include_examples 'rewrite the url'
    end

    context 'with surrounding whitespace' do
      let(:data) { 'background: url( ../images/background.gif )' }
      include_examples 'rewrite the url'

      context 'with single quotes' do
        let(:data) { "background: url( '../images/background.gif' )" }
        include_examples 'rewrite the url'
      end

      context 'with double quotes' do
        let(:data) { 'background: url( "../images/background.gif" )' }
        include_examples 'rewrite the url'
      end
    end
  end

  context 'with an expected hash' do
    let(:hash) { '1234abcd' }
    let(:data) { 'background: url(../images/background.gif)' }
    let(:expected) { 'background: url(/assets/images/background-1234abcd.gif)' }

    include_examples 'rewrite the url'
  end

  context 'with a different asset prefix' do
    let(:asset_prefix) { '/differentpath' }
    let(:data) { 'background: url(../images/background.gif)' }
    let(:expected) do
      %r{\Abackground: url\(/differentpath/images/background-\h+\.gif\)\z}
    end

    include_examples 'rewrite the url'
  end

  context 'with trailing text' do
    let(:data) { 'background: url(../images/background.gif) repeat-x' }
    let(:expected) do
      %r{\Abackground: url\(/assets/images/background-\h+\.gif\) repeat-x\z}
    end

    include_examples 'rewrite the url'
  end

  context 'with a lower relative url' do
    let(:data) { 'background: url(extra/test.gif)' }
    let(:expected) do
      %r{\Abackground: url\(/assets/css/extra/test-\h+\.gif\)\z}
    end

    include_examples 'rewrite the url'
  end

  context 'with url encoding' do
    let(:data) { 'background: url(../images/%5c.gif)' }
    let(:expected) { %r{background: url\(/assets/images/%5[cC]-\h+\.gif\)} }

    include_examples 'rewrite the url'
  end

  context 'with query parameters' do
    let(:data) { 'background: url(../images/background.gif?1)' }
    let(:expected) do
      %r{background: url\(/assets/images/background-\h+\.gif\?1\)}
    end

    include_examples 'rewrite the url'
  end

  context 'with a url fragment' do
    let(:data) { 'background: url(../images/background.gif#1)' }
    let(:expected) do
      %r{background: url\(/assets/images/background-\h+\.gif#1\)}
    end

    include_examples 'rewrite the url'
  end

  context 'with a root-relative url' do
    let(:data) { 'background: url(/images/background.gif)' }
    include_examples 'leave the url alone'
  end

  context 'with an absolute url' do
    let(:data) { 'background: url(http://example.com/images/background.gif)' }
    include_examples 'leave the url alone'
  end

  context 'with a non-existent file' do
    let(:data) { 'background: url(../images/nonexistent.gif)' }
    include_examples 'leave the url alone'
  end

  context 'with preceding characters' do
    let(:data) { 'background: nurl(../images/background.gif)' }
    include_examples 'leave the url alone'
  end

  context 'with escaped characters' do
    let(:data) { 'background: url(../\ images/background.gif)' }
    include_examples 'leave the url alone'
  end

  context 'with escaped parentheses' do
    let(:data) { 'background: url(../\)images/background.gif)' }
    include_examples 'leave the url alone'
  end
end