require 'digest/md5'

class Post < ActiveRecord::Base
  belongs_to :discussion
#  belongs_to :parent, :class_name => "Post", :foreign_key => "parent"

  def to_html
    "<p>" + linkify(CGI.escapeHTML(content)).gsub(/\r?(\n\r?){2,}/, "</p>\n<p>") + "</p>"
  end

  def linkify(str)
    urlprotocols = "http|https|ftp|news|nntp|irc|gopher"
    
    str.gsub(/((?:(?:#{urlprotocols}):[^\]\s\"<>]+))/) { 
      "<a rel='nofollow' href='#{$&}'>#{$&}</a>"
    }.gsub(/[\w\d.+=-]+@[\w\d.-]+\.[\w\d]+/) {
      "<a rel='nofollow' href='mailto:#{$&}'>#{$&}</a>"
    }      
  end

  def tripcode=(password)
    if author? && !password.empty?
      self[:tripcode] = Digest::MD5.new(author + SALT + password).
        to_s.to_i(16).to_s(36)[-6..-1]
    else
      self[:tripcode] = nil
    end
  end

  def self.last_post_id
    Integer(Post.find_by_sql("select max(id) as last_post from posts")[0]["last_post"])
  end
end