require 'fileutils'
require 'less'

module Bonsai
  class Exporter
    @@path = "output"
    
    class << self
      def path; @@path; end
      def path=(path); @@path = path; end
      
      def process!
        setup
        copy_public
        copy_assets
        cleanup
      end
      
      def publish!
        teardown
        setup
        copy_assets
        copy_public
        compress_assets
        write_index
        write_pages
        cleanup
      end
      
      protected 
      def teardown
        FileUtils.rm_rf path
      end

      def setup
        FileUtils.mkdir_p path
      end
      
      def cleanup
        remove_less_from_public
      end
      
      def write_index
        Bonsai.log "Writing index"
        File.open("#{path}/index.html", "w") {|file| file.write(Page.find("index").render)}
      end
      
      def write_pages
        Bonsai.log "Writing pages"
        Page.all.each do |page|
          Bonsai.log "\t Writing page - #{page.permalink}"
          FileUtils.mkdir_p("#{path}#{page.permalink}")
          File.open("#{path}#{page.write_path}", "w"){|file| file.write(page.render) }
        end
      end
      
      def copy_assets
        Bonsai.log "Copying page assets"
        Page.all.each do |page|
          page.assets.each do |asset|      
            # Create the path to the asset by the export path of the page + File.dirname(asset permalink)
            FileUtils.mkdir_p "#{path}#{File.dirname(asset[:path])}"
            
            # Copy the the asset from its disk path to File.dirname(asset permalink)
            FileUtils.cp asset[:disk_path], "#{path}#{asset[:path]}"            
          end
        end
      end
      
      def copy_public
        generate_css_from_less
        
        Bonsai.log "Copying public files"
        # Using system call because fileutils is inadequate
        system("cp -fR '#{Bonsai.root_dir}/public/' '#{path}'")
      end
      
      def compress_assets
        yui_compressor = File.expand_path("#{File.dirname(__FILE__)}/../../vendor/yui-compressor/yuicompressor-2.4.2.jar")
        
        Bonsai.log "Compressing javascript and stylesheets"
        Dir["#{path}/**/*.{js,css}"].each do |asset|
          system "java -jar #{yui_compressor} #{File.expand_path(asset)} -o #{File.expand_path(asset)}"
        end
      end
      
      def generate_css_from_less
        Dir["#{Bonsai.root_dir}/public/**/*.less"].each do |lessfile|
          css = File.open(lessfile) {|f| Less::Engine.new(f) }.to_css
          path = "#{File.dirname(lessfile)}/#{File.basename(lessfile, ".less")}.css"
          
          File.open(path, "w") {|file| file.write(css) }
        end
      rescue Less::SyntaxError => exception
        Bonsai.log "LessCSS Syntax error\n\n#{exception.message}"
      end
      
      def remove_less_from_public
        Dir["#{path}/**/*.less"].each{|f| FileUtils.rm(f) }
      end
    end
  end
end