require "middleman-core/sitemap/extensions/traversal"

module Middleman

  # Sitemap namespace  
  module Sitemap
  
    # Sitemap Resource class
    class Resource
      include Middleman::Sitemap::Extensions::Traversal
        
      # @return [Middleman::Application]
      attr_reader :app
    
      # @return [Middleman::Sitemap::Store]
      attr_reader :store
    
      # The source path of this resource (relative to the source directory,
      # without template extensions)
      # @return [String]
      attr_reader :path
    
      # Set the on-disk source file for this resource
      # @return [String]
      # attr_reader :source_file
    
      def source_file
        @source_file || get_source_file
      end
    
      # Initialize resource with parent store and URL
      # @param [Middleman::Sitemap::Store] store
      # @param [String] path
      # @param [String] source_file
      def initialize(store, path, source_file=nil)
        @store       = store
        @app         = @store.app
        @path        = path
        @source_file = source_file
      
        @destination_paths = [@path]

        @local_metadata = { :options => {}, :locals => {}, :page => {}, :blocks => [] }
      end
    
      # Whether this resource has a template file
      # @return [Boolean]
      def template?
        return false if source_file.nil?
        !::Tilt[source_file].nil?
      end
    
      # Get the metadata for both the current source_file and the current path
      # @return [Hash]
      def metadata
        result = store.metadata_for_file(source_file).dup

        path_meta = store.metadata_for_path(path).dup
        if path_meta.has_key?(:blocks)
          result[:blocks] << path_meta[:blocks]
          path_meta.delete(:blocks)
        end
        result.deep_merge!(path_meta)

        local_meta = @local_metadata.dup
        if local_meta.has_key?(:blocks)
          result[:blocks] << local_meta[:blocks]
          local_meta.delete(:blocks)
        end
        result.deep_merge!(local_meta)

        result[:blocks] = result[:blocks].flatten.compact
        
        result
      end

      # Merge in new metadata specific to this resource.
      # @param [Hash] metadata A metadata block like provides_metadata_for_path takes
      def add_metadata(metadata={}, &block)
        if metadata.has_key?(:blocks)
          @local_metadata[:blocks] << metadata[:blocks]
          metadata.delete(:blocks)
        end
        @local_metadata.deep_merge!(metadata)
        @local_metadata[:blocks] << block if block_given?
      end
    
      # Get the output/preview URL for this resource
      # @return [String]
      def destination_path
        @destination_paths.last
      end
    
      # Set the output/preview URL for this resource
      # @param [String] path
      # @return [void]
      def destination_path=(path)
        @destination_paths << path
      end
    
      # Extension of the path (i.e. '.js')
      # @return [String]
      def ext
        File.extname(path)
      end
    
      # Mime type of the path
      # @return [String]
      def mime_type
        app.mime_type ext
      end
    
      # Render this resource
      # @return [String]
      def render(opts={}, locs={}, &block)
        return File.open(source_file).read unless template?
      
        start_time = Time.now
        puts "== Render Start: #{source_file}" if app.logging?

        md   = metadata.dup
        opts = md[:options].deep_merge(opts)
        locs = md[:locals].deep_merge(locs)

        # Forward remaining data to helpers
        if md.has_key?(:page)
          app.data.store("page", md[:page])
        end

        md[:blocks].each do |aBlock|
          app.instance_eval(&aBlock)
        end
      
        app.instance_eval(&block) if block_given?
        
        app.current_path ||= self.destination_path
        result = app.render_template(source_file, locs, opts)

        puts "== Render End: #{source_file} (#{(Time.now - start_time).round(2)}s)" if app.logging?
        result
      end
    
      # A path without the directory index - so foo/index.html becomes
      # just foo. Best for linking.
      # @return [String]
      def url
        ('/' + destination_path).sub(/\/#{Regexp.escape(app.index_file)}$/, '/')
      end
    end
  end
end