require 'json'

module Sinatra
  module Resin
    module Helpers
      def self.append_js_file(filename, to_array)
        filename = File.basename(filename)

        if Sinatra::Resin.development?
          unless filename.include? 'deploy'
            to_array << filename
          end
          return
        end

        if (filename.include? 'deploy') && !(filename.include? '-Tests')
          to_array << filename
        end
      end

      def development?
        Sinatra::Resin.development?
      end

      def javascript_files
        files = []

        # First our project's files take precedence
        Dir.glob("#{Dir.pwd}/js/*.js") do |filename|
          Sinatra::Resin::Helpers.append_js_file(filename, files)
        end

        # Then our drops get loaded
        drops.each do |drop|
          unless drop[:meta]
            next
          end

          if drop[:js]
            drop[:js].each do |filename|
              Sinatra::Resin::Helpers.append_js_file(filename, files)
            end
          end
        end

        files
      end

      def find_template(views, name, engine, &block)
        Array(views).each do |view|
          super(view, name, engine, &block)
        end
      end

      def embed_amber(options={})
        deploy_line = ''
        unless development?
          deploy_line = "deploy: true,"
        end

        on_ready_function = options[:on_ready] || ''

        return <<-END
          <script type="text/javascript" src="/js/amber.js"></script>
          <script type="text/javascript">
            loadAmber({
              #{deploy_line}
              files : #{JSON.dump(javascript_files)},
              prefix : 'js',
              ready : function() { #{on_ready_function} }
            });
          </script>
        END
      end

      def load_resource(prefix, filename)
        # A file in our working directory will take precedence over the
        # Amber-bundled files. This should allow custom Kernel-Objects.js files
        # for example.
        local_file = File.join(Dir.pwd, "#{prefix}/", filename)
        amber_file = File.join(Sinatra::Resin::AMBER_PATH, "/#{prefix}/", filename)

        if File.exists? local_file
          File.open(local_file, 'r').read
        elsif File.exists? amber_file
          File.open(amber_file, 'r').read
        else
          nil
        end
      end

      def load_drop_resource(filename)
        drops.each do |drop|
          if drop.nil? or drop.empty? or drop[:js].empty?
            next
          end

          drop[:js].each do |drop_filepath|
            drop_filename = File.basename(drop_filepath)
            if filename == drop_filename
              return File.open(drop_filepath).read
            end
          end
        end
        nil
      end

      def content_type_for_ext(filename)
        if File.extname(filename) == '.js'
          content_type 'application/javascript'
        elsif File.extname(filename) == '.css'
          content_type 'text/css'
        else
          content_type 'text/plain'
        end
      end

      def load_drop_file(filepath)
        YAML::load(File.open(filepath).read)
      end

      def self.flush_drops
        @@drops = nil
        @@drops_map = {}
        @@drops_filemap = {}
      end

      def drops_map
        @@drops_map
      end

      def drops_filemap
        @@drops_filemap
      end

      def drops
        @@drops ||= begin
          @@drops_map ||= {}
          @@drops_filemap ||= {}
          drops_path = File.join(Dir.pwd, 'drops')
          loaded = []
          Dir.glob("#{drops_path}/*/drop.yml") do |filename|
            drop = load_drop_file(filename)
            if drop.nil? or drop.empty?
              next
            end
            drop_dir = File.dirname(filename)
            name = drop['drop']['name']
            puts ">>> Loading Resin Drop: #{name}"

            data = {:meta => drop['drop'],
                      :js => Dir[File.join(drop_dir, 'js', '*.js')],
                      :st => Dir[File.join(drop_dir, 'st', '*.st')]
                      }
            loaded << data

            @@drops_map[name] = drop_dir

            data[:js].each do |js|
              @@drops_filemap[File.basename(js)] = name
            end
            data[:st].each do |st|
              @@drops_filemap[File.basename(st)] = name
            end
          end
          loaded
        end
      end
    end
  end
end