module Stack
  module Template
    attr_accessor :generator
    
    attr_accessor :basename
    attr_accessor :path
    attr_accessor :original_extension
    attr_accessor :extension
    
    attr_accessor :raw
    
    def initialize(path, generator = nil)
      self.generator = generator
      self.path = path
      self.original_extension = "html"
      
      if File.file?(path)
        self.basename = File.basename(path)
        ext = File.extname(path)

        self.original_extension = ext[1, ext.length]
        self.extension = self.original_extension
        
        read
      end
    end
    
    def read
      f = File.open(self.path)
      self.raw = f.read
      f.close
    end
    
    def render(_payload = { }, do_layout = true)
      _payload = template_payload.deep_merge(_payload)
      
      layout_name = _payload[:layout]
      
      if (layout_name and do_layout)
        if !self.generator.layouts[layout_name]
          puts "The layout `#{layout_name}` does not exist in `_layouts`."
          exit
        end
        
        # get layout 
        _tpl_payload = self.generator.layouts[layout_name].template_payload
        _tpl_payload.delete(:layout)
        _tpl_payload.delete(:template)
        _tpl_payload.delete(:generator)
        
        #puts _tpl_payload.inspect
        #puts "\n"
        
        _payload = _payload.merge(_tpl_payload)
      end
      
      # here we have the payload
      # look for the permalink?
      permalink = _payload[:permalink]
      
      if (permalink)
        self.path = permalink
      end
      
      #puts _payload.inspect
      #puts "\n\n"
      
      content = Liquid::Template.parse(self.raw).render(Mash.new(_payload), Stack::Filters::Register.extensions)
      content = self.transform(content)
      
      if (layout_name and do_layout)
        _payload.delete(:layout)
        begin
          _payload = _payload.merge({ :content => content })

          content = self.generator.layouts[layout_name].render(_payload)
        rescue => e
          STDERR.puts e.to_str
        end
      end
      
      return content
    end
    
    def template_payload
      {
        :template => self.to_hash,
        :generator => self.generator.to_hash
      }.merge(self.payload)
    end
    
    def payload
      raise InterfaceNotProvided
    end
    
    def to_hash
      {
        
      }.merge(self.payload)
    end
    
    def transform(content = self.raw)
      case self.basename
      when /\.textile/
        self.extension = "html"
        RedCloth.new(content).to_html
      when /\.(mdown|markdown|mkdn|md)/
        self.extension = "html"
        Maruku.new(content).to_html
      when /\.(less)/
        self.extension = "css"
        Less::Engine.new(content).to_css
      when /\.(liquid|liq)/
        self.extension = "html"
      else
        content
      end
    end
    
    def write!(content = self.render)
      FileUtils.mkdir_p(File.dirname(write_path))
      out = File.open(write_path, "w+")
      out.rewind
      out.write(content)
      out.close
    end
    
    def write_path
      File.join(self.generator.target, self.write_filename)
    end
    
    def write_basename
      if self.basename
        self.basename.gsub(".#{self.original_extension}", "")
      else
        @write_basename ||= Digest::MD5.hexdigest(self.raw)
      end
    end
    
    def write_filename
      "#{write_basename}.#{self.extension}"
    end
  end
end