require 'find'
require 'fileutils'

class Wrongdoc::Final
  include Wrongdoc::ParseXML
  include Wrongdoc::NewsAtom
  SE_URL = 'http://kernel.org/pub/software/scm/git/docs/git-send-email.html'

  def run
    Find.find('doc') { |path| /\.html\z/ =~ path and fix(path) }
    FileUtils.rm_rf('doc/js')
    news_atom
  end

  def initialize(opts, git_tag = nil)
    @cgit_uri = URI.parse(opts[:cgit_url])
    @rdoc_uri = URI.parse(opts[:rdoc_url])
    ml_url = opts[:ml_url] and @ml_uri = URI.parse(ml_url)
    @public_email = opts[:public_email] or warn ":public_email unset"
    @private_email = opts[:private_email] or warn ":private_email unset"
    @git_tag = git_tag
  end

  # returns a cgit URI for the given +path+ and +lineno+
  def path_uri(path, lineno)
    uri = @cgit_uri.dup
    uri.path += "/tree/#{URI.escape(path)}"
    uri.fragment = "n#{lineno}"
    uri.query = "id=#{URI.escape(@git_tag)}" if @git_tag
    uri
  end

  # delete all the stuff that offends us
  def killkillkill!(doc)
    unlink = proc { |node| node.unlink }

    # JavaScript is dangerous
    doc.search("script").each(&unlink)

    # if your project's big enough to need JS search, it's too bloated
    doc.search('span.search-toggle').each(&unlink)
    doc.search('form').each(&unlink)

    # remove W3C validator link, we use tidy instead
    doc.search('div#validator-badges p').each { |x|
      /Validate/i =~ x.content and x.unlink
    }

    # this shows up in browsers that don't do stylesheets
    doc.search('div#no-class-search-results').each(&unlink)
  end

  # since we killed off JavaScript, viewing source isn't possible with
  # RDoc anymore, so link people to the web source viewer
  def source_linkify!(doc)
    doc.search('div.method-detail').each { |mdetail|
      path = lineno = nil
      mdetail.search('div.method-source-code').each { |src|
        src.search('span.ruby-comment').each { |x|
          if x.content =~ /File\s+(\S+),\s+line\s+(\d+)/s
            path, lineno = $1, $2
          end
        }
        src.unlink if path && lineno
      }
      mdetail.search('span.method-click-advice').each { |x|
        x.content = ''
        a = Nokogiri::XML::Node.new('a', doc)
        a['href'] = (path && lineno ? path_uri(path, lineno) : @cgit_uri).to_s
        a.content = 'view method source'
        x.add_child(a)
      }
    }
  end

  # Don't give the original Darkfish a bad name, and advertise ourselves :)
  def advertise!(doc)
    doc.search('div#validator-badges p small').each { |x|
      if /\AGenerated/ =~ x.content
        first = x.children.first
        first.content = first.content.gsub(/\AG/, "Originally g")
        last = x.children.last
        last.content = "#{last.content}, modified by "

        a = Nokogiri::XML::Node.new('a', doc)
        a["href"] = "http://bogomips.org/wrongdoc/"
        a.content = "wrongdoc"
        last.add_next_sibling(a)

        @public_email && @private_email or return
        txt = <<-EOF
        We love to hear from you!<br />
        Email patches (with <a href="#{SE_URL}">git send-email</a>),
        pull requests, questions, bug reports, suggestions, etc.
        to us publically at:
        <a href="mailto:#@public_email">#@public_email</a><br />
        EOF

        case @public_email
        when /@librelist\.(?:com|org)\z/
          txt << <<-EOF
          To subscribe, just send any email to
          <a href="mailto:#@public_email">#@public_email</a>,
          and respond to the automated confirmation message.
          EOF
        when /\A(.+)@(rubyforge\.org)\z/ # Mailman
          requests = "#$1-request@#$2"
          txt << <<-EOF
          No subscription to the mailing list is necessary,
          just let us know to <b>Cc:</b> you if you're unsubscribed.<br />
          To subscribe, email
          <a href="mailto:#{requests}?subject=subscribe">#{requests}</a>
          with \"subscribe\" in the Subject
          and respond to the automated confirmation message.
          EOF
        when /public/
          txt << <<-EOF
          This is a <a href="http://public-inbox.org/">public-inbox</a> with no sign up.<br />
          Please Cc: all recipients on replies, as not everybody subscribes
          with <a href="http://ssoma.public-inbox.org/">ssoma</a>.<br />
          See <a href="#@ml_uri">#@ml_uri</a> for archives and more information.
          EOF
        end

        txt << <<-EOF
        <br />
        <b>
        Do not waste bandwidth with HTML, HTML mail will not be read.<br />
        Quote only parts you're responding to and do not
        <a href="http://catb.org/jargon/html/T/top-post.html">top post</a>.
        <br />
        </b>
        For sensitive topics, email us privately at:
        <a href="mailto:#@private_email">#@private_email</a>
        EOF
        para = Nokogiri::XML.fragment(txt)

        last.parent.parent.add_next_sibling(para)
      end
    }
  end

  def fix(file)
    File.open(file, "a+") do |fp|
      buf = process(fp.read)
      fp.truncate 0
      fp.write buf
    end
  end

  # the main entry point, this does all the require processing on any
  # given String buffer.
  def process(str)
    doc = parse_xml(str)
    killkillkill!(doc)
    source_linkify!(doc)
    advertise!(doc)
    doc.to_xhtml(:indent => 0)
  end
end