# encoding: UTF-8

$LOAD_PATH.unshift File.dirname(__FILE__) + "/../lib"

require 'github/markup'
require 'minitest/autorun'
require 'html/pipeline'
require 'nokogiri'
require 'nokogiri/diff'

def normalize_html(text)
  text.strip!
  text.gsub!(/\s\s+/,' ')
  text.gsub!(/\p{Pi}|\p{Pf}|&amp;quot;/u,'"')
  text.gsub!("\u2026",'...')
  text
end

def assert_html_equal(expected, actual, msg = nil)
    assertion = Proc.new do
      expected_doc = Nokogiri::HTML(expected) {|config| config.noblanks}
      actual_doc   = Nokogiri::HTML(actual) {|config| config.noblanks}

      expected_doc.search('//text()').each {|node| node.content = normalize_html node.content}
      actual_doc.search('//text()').each {|node| node.content = normalize_html node.content}

      ignore_changes = {"+" => Regexp.union(/^\s*id=".*"\s*$/), "-" => nil}
      expected_doc.diff(actual_doc) do |change, node|
        if change != ' ' && !node.blank? then
          break unless node.to_html =~ ignore_changes[change]
        end
      end
    end
    assert(assertion.call, msg)
end

class MarkupTest < Minitest::Test
  class MarkupFilter < HTML::Pipeline::Filter
    def call
      filename = context[:filename]
      GitHub::Markup.render(filename, File.read(filename)).strip.force_encoding("utf-8")
    end
  end

  Pipeline = HTML::Pipeline.new [
    MarkupFilter,
    HTML::Pipeline::SanitizationFilter
  ]

  Dir['test/markups/README.*'].each do |readme|
    next if readme =~ /html$/
    markup = readme.split('/').last.gsub(/^README\./, '')

    define_method "test_#{markup}" do
      skip "Skipping MediaWiki test because wikicloth is currently not compatible with JRuby." if markup == "mediawiki" && RUBY_PLATFORM == "java"

      source = File.read(readme)
      expected_file = "#{readme}.html"
      expected = File.read(expected_file).rstrip
      actual = Pipeline.to_html(nil, :filename => readme)

      if source != expected
        assert(source != actual, "#{markup} did not render anything")
      end

      diff = IO.popen("diff -u - #{expected_file}", 'r+') do |f|
        f.write actual
        f.close_write
        f.read
      end

      assert_html_equal expected, actual, <<message
#{File.basename expected_file}'s contents are not html equal to output:
#{diff}
message
    end
  end

  def test_knows_what_it_can_and_cannot_render
    assert_equal false, GitHub::Markup.can_render?('README.html')
    assert_equal true, GitHub::Markup.can_render?('README.markdown')
    assert_equal true, GitHub::Markup.can_render?('README.rmd')
    assert_equal true, GitHub::Markup.can_render?('README.Rmd')
    assert_equal false, GitHub::Markup.can_render?('README.cmd')
    assert_equal true, GitHub::Markup.can_render?('README.litcoffee')
  end

  def test_raises_error_if_command_exits_non_zero
    GitHub::Markup.command('test/fixtures/fail.sh', /fail/)
    assert GitHub::Markup.can_render?('README.fail')
    begin
      GitHub::Markup.render('README.fail', "stop swallowing errors")
    rescue GitHub::Markup::CommandError => e
      assert_equal "failure message", e.message
    else
      fail "an exception was expected but was not raised"
    end
  end

  def test_preserve_markup
    content = "Noël"
    assert_equal content.encoding.name, GitHub::Markup.render('Foo.rst', content).encoding.name
  end
end
