module Spinebox
  module Compiler
    
    require "digest"
    
    # Compiles the assets and the views into the public folder
    def self.compile
      Spinebox.config.concatenate = true
      create_directories
      compile_javascripts
      compile_stylesheets
      compile_views
      copy_images
    end
    
    private
    def self.create_directories
      Dir.mkdir "public"         unless File.directory?("public")
      Dir.mkdir "public/assets"  unless File.directory?("public/assets")
    end
    
    def self.compile_javascripts
      asset = Spinebox.assets["application.js"]
      path  = File.join("public/assets", asset.logical_path)
      
      write_asset!(asset, path) if asset_updated?(asset, path)
    end
    
    def self.compile_stylesheets
      asset = Spinebox.assets["application.css"]
      path  = File.join("public/assets", asset.logical_path)
      
      write_asset!(asset, path) if asset_updated?(asset, path)
    end
    
    def self.compile_views
      Spinebox.views.each_logical_path do |logical_path|
        next if logical_path.start_with?("_")
        asset = Spinebox.views[logical_path]
        path  = File.join("public", asset.logical_path)
        
        write_asset!(asset, path) if asset_updated?(asset, path)
      end      
    end
    
    def self.copy_images
      FileUtils.cp_r "app/assets/images/.", "public/assets", :preserve => true
    end
    
    def self.asset_updated?(asset, path)
      return true unless File.exists?(path)
      Digest::SHA2.file(path).hexdigest != Digest::SHA2.hexdigest(asset.to_s)
    end
    
    def self.write_asset!(asset, path)
      asset.write_to(path) 
      time = Time.now
      File.utime(time, time, path)
      puts path
    end
    
  end
end