require 'clothesline'

class Nukumi2::Entry
  DEFAULT_ENCODING = "BlueCloth RubyPants"

  attr_accessor :title
  attr_accessor :time
  attr_accessor :gmtime
  attr_accessor :change_time
  attr_accessor :encoding

  attr_accessor :content
  attr_accessor :summary

  attr_accessor :backend
  attr_accessor :backend_data

  attr_reader :fields
  attr_reader :categories

  def initialize(title="", content="", time=Time.now, change_time=nil)
    self.title = title
    self.time = time
    self.change_time = change_time || self.time

    @fields = {}
    @categories = []

    self.encoding = DEFAULT_ENCODING
    self.content = self.summary = content

    @cache = nil
  end

  def outdated?
    @backend.outdated? self
  end

  def update!
    replace @backend.load(self)
  end

  def replace(new)
    delete_from_topictree

    # XXX icky
    self.title = new.title
    self.time = new.time
    self.gmtime = new.gmtime
    self.change_time = new.change_time
    self.encoding = new.encoding
    self.content = new.content
    self.summary = new.summary
    @fields = new.fields
    @categories = new.categories

    insert_into_topictree @topictree  if @topictree
  end

  def insert_into_topictree(topictree)
    @topictree = topictree

    topictree.create permalink, title
    topictree.add permalink, self

    categories.each { |category|
      topictree.add "/category/**/" + category.downcase, self
    }
    
    if fields["page"]
      path = "/static/" + fields["page"].gsub(/\/index$/, '')
      
      unless topictree.name(path)
        topictree.create path, title
      end
      
      topictree.add path, self
    end

    if fields["topic"]
      unless topictree.name(fields["topic"])
        topictree.create fields["topic"], title
      end
      
      topictree.add fields["topic"], self
    end
  end

  def delete_from_topictree
    @topictree.delete self  if @topictree
  end

  def to_html
    if outdated?
      update!
      @cache = nil
    end

    begin
      @cache ||= ClothesLine.parse(encoding).new(content).to_html
    rescue
      @cache = nil
      return <<-EOF
        <div class="html-conversion-error">
          <strong>Error during HTML conversion:</strong>
          <pre>#{CGI.escapeHTML($!.to_s)}</pre>
        </div>
      EOF
    end

    @cache
  end

  def summary_html
    ClothesLine.parse(encoding).new(summary).to_html
  end
  
  def anchor
    # Ick.
    time.dup.gmtime.strftime "x-%Y%m%d-%H%M%S"
  end

  # This is used to create the filename.
  def basename
    title.downcase.strip.gsub(/[^a-z0-9]/, '-').
      squeeze('-').gsub(/^-*/, '').gsub(/-*$/, '')
  end

  def permalink
    time.strftime "/archive/%Y/%m/#{basename}"
  end
end