module ChocTop
  module Appcast
    def make_build
      if skip_build
        puts "Skipping build task..."
      else
        sh "xcodebuild -configuration #{build_type} -target #{build_target} #{build_opts}"
      end
    end

    def make_appcast
      FileUtils.mkdir_p(build_path)
      appcast = File.open("#{build_path}/#{appcast_filename}", 'w') do |f|
        xml = Builder::XmlMarkup.new(:indent => 2)
        xml.instruct!
        xml_string = xml.rss('xmlns:atom' => "http://www.w3.org/2005/Atom",
                             'xmlns:sparkle' => "http://www.andymatuschak.org/xml-namespaces/sparkle",
                             :version => "2.0") do
          xml.channel do
            xml.title(@name)
            xml.description("#{@name} updates")
            xml.link(base_url)
            xml.language('en')
            xml.pubDate( Time.now.strftime("%a, %d %b %Y %H:%M:%S %z") )
            # xml.lastBuildDate(Time.now.rfc822)
            xml.atom(:link, :href => "#{base_url}/#{appcast_filename}",
                     :rel => "self", :type => "application/rss+xml")

            xml.item do
              xml.title("#{name} #{version}")
              xml.tag! "sparkle:releaseNotesLink", "#{base_url}/#{release_notes}"
              xml.pubDate Time.now.strftime("%a, %d %b %Y %H:%M:%S %z")
              xml.guid("#{name}-#{version}", :isPermaLink => "false")
              xml.enclosure(:url => "#{base_url}/#{pkg_name}",
                            :length => "#{File.size(pkg)}",
                            :type => "application/dmg",
                            :"sparkle:version" => version,
                            :"sparkle:dsaSignature" => dsa_signature)
            end
          end
        end
        f << xml_string
      end
    end

    def make_dmg_symlink
      FileUtils.chdir(build_path) do
        `rm '#{versionless_pkg_name}'`
        `ln -s '#{pkg_name}' '#{versionless_pkg_name}'`
      end
    end

    def make_index_redirect
      File.open("#{build_path}/index.php", 'w') do |f|
        f << %Q{<?php header("Location: #{pkg_relative_url}"); ?>}
      end
    end

    def skip_build
      return true if ENV['NO_BUILD']
      return false if File.exists?('Info.plist')
      return false if Dir['*.xcodeproj'].size > 0
      true
    end

    def make_release_notes
      File.open("#{build_path}/#{release_notes}", "w") do |f|
        template = File.read(release_notes_template)
        f << ERB.new(template).result(binding)
      end
    end

    def release_notes_content
      if File.exists?("release_notes.txt")
        File.read("release_notes.txt")
      else
        <<-TEXTILE.gsub(/^      /, '')
        h1. #{version} #{Date.today}

        h2. Another awesome release!
        TEXTILE
      end
    end

    def release_notes_html
      RedCloth.new(release_notes_content).to_html
    end

    def upload_appcast
      _host = host.nil? ? "" : host
      _user = user.nil? ? "" : "#{user}@"
      case transport
      when :scp
        # this is whack, really, work out your rsync options
        sh %{scp #{scp_args} #{build_path}/* #{_user}#{_host}:#{remote_dir}}
      else # default to rsync as per original
        sh %{rsync #{rsync_args} #{build_path}/ #{_user}#{_host}:#{remote_dir}}
      end
    end

    # Returns a file path to the dsa_priv.pem file
    # If private key + public key haven't been generated yet then
    # generate them
    def private_key
      unless File.exists?('dsa_priv.pem')
        puts "Creating new private and public keys for signing the DMG..."
        `openssl dsaparam 2048 < /dev/urandom > dsaparam.pem`
        `openssl gendsa dsaparam.pem -out dsa_priv.pem`
        `openssl dsa -in dsa_priv.pem -pubout -out dsa_pub.pem`
        `rm dsaparam.pem`
        puts <<-EOS.gsub(/^      /, '')

        WARNING: DO NOT PUT dsa_priv.pem IN YOUR SOURCE CONTROL
                 Remember to add it to your ignore list

        EOS
      end
      File.expand_path('dsa_priv.pem')
    end

    def dsa_signature
      @dsa_signature ||= `openssl dgst -sha1 -binary < "#{pkg}" | openssl dgst -dss1 -sign "#{private_key}" | openssl enc -base64`
    end
  end
end