["rubygems","builder","yaml", "fileutils", "redcloth", "erb","uri"].each { |l| require l }

class Blaag    
  TITLE            = "Majestic Sea Creature"
  DOMAIN           = "blog.majesticseacreature.com"    
  AUTHOR           = "Gregory Brown"             
  DESCRIPTION      = "Technical Ramblings from #{AUTHOR}" 
  BASEDIR          = File.dirname(File.expand_path(__FILE__)) + "/../" 
        
  def self.generate  
    entries = Dir["#{Blaag::BASEDIR}/entries/**/*"].
                reject { |f| File.directory?(f) }          
                
    entries.map! { |e| Entry.load(e) }     
        
    @blaag = Blaag.new(entries)      
    
    File.open("#{Blaag::BASEDIR}/www/index.html","w") { |f|
      f << layout { @blaag.to_html }
    }        
    
    File.open("#{Blaag::BASEDIR}/www/rss.xml","w") { |f|
      f << @blaag.to_rss
    }     
          
    @blaag.entries.each do |e|
      FileUtils.mkdir_p "#{Blaag::BASEDIR}/www/archives/#{e.archive}"
      File.open("#{Blaag::BASEDIR}/www/archives/#{e.archive}/#{e.file}.html","w") { |f|
        f << layout { e.to_html }
      }                                           
    end  
    
    build_archive_indices(@blaag.entries)
    
  end                    
  
  def self.build_archive_indices(entries)
    archives = Hash.new { |h,k| h[k] = [] }
    entries.each do |e|
      archives[e.archive] << e
    end
    archives.each do |arch, entries|
      @top_entries = entries.sort_by { |e| e.published_date }.reverse 
      File.open("#{Blaag::BASEDIR}/www/archives/#{arch}/index.html","w") { |f|
        f << layout { ProcessTemplate("blog") }
      }
    end
  end
  
  attr_reader :entries
  
  def initialize(entries)
    @entries = entries 
    @top_entries = entries.sort_by { |e| e.published_date }.reverse[0..14]  
  end   
  
  def to_html
     ProcessTemplate("blog")
  end
  
  def to_rss
    xml = Builder::XmlMarkup.new
    xml.instruct!
    xml.rss :version => "2.0" do
      xml.channel do
        xml.title       TITLE
        xml.link        "http://#{DOMAIN}/"
        xml.description  DESCRIPTION
        xml.language    "en-us"

        @entries.each do |entry|
          xml.item do
            xml.title       entry.title
            xml.description entry.description
            xml.author      AUTHOR
            xml.pubDate     entry.published_date
            xml.link        entry.url
            xml.guid        entry.url
          end
        end
      end
    end
  end       
  
  class Entry      
    
    def self.registry
      @registry ||= YAML.load_file("#{Blaag::BASEDIR}/data/registry.yml")     
    end 
    
    def self.update_registry(filename,mtime) 
      registry[filename] ||= mtime
      File.open("#{Blaag::BASEDIR}/data/registry.yml","w") do |f|
        f << @registry.to_yaml    
      end
    end
         
    def self.load(filename)          
      file = File.open(filename)
      update_registry(filename,file.mtime)        
      
      options = parse(file.read)       
      options[:published_date] = registry[filename]       
      options[:archive] = File.dirname(filename) =~ /.*\/(.*)\/?.*/ && $1
      options[:url]     = "http://#{Blaag::DOMAIN}/archives/#{options[:archive]}/#{File.basename(filename)}.html"   
      options[:file]    = File.basename(filename)
      
      entry = Entry.new(options)   
    end                                 
    
    def self.parse(entry)
      entry =~ /=title(.*)=description(.*)=entry(.*)/m   
      { :title => $1.strip, :description => $2.strip, :entry => $3.strip }
    end
    
    def initialize(options={})   
      @title          = options[:title]
      @description    = options[:description]
      @entry          = RedCloth.new(options[:entry]).to_html
      @archive        = options[:archive]
      @published_date = options[:published_date]
      @url            = options[:url] 
      @file           = options[:file]          
    end      
    
    attr_reader :title, :description, :entry, :archive, :published_date, :url,
                :file  
    
    def to_html
      ProcessTemplate("entry") 
    end    
    
    def related                                                            
      link = URI.escape(url)    
      "<a href='http://blogsearch.google.com/blogsearch?hl=en&q=link%3A#{link}&btnG=Search+Blogs'>" +
      "Responses</a>" 
    end
        
  end  
  
  def self.layout(&block)
    ProcessTemplate("layout",&block) 
  end
  
end  

def ProcessTemplate(file)
  ERB.new(File.read("#{Blaag::BASEDIR}/templates/#{file}.html.erb")).result(binding)  
end