module Fog
  module Brightbox
    class Storage
      class File < Fog::Model
        identity :key, aliases: "name"

        attribute :content_length,  aliases: %w[bytes Content-Length], type: :integer
        attribute :content_type,    aliases: %w[content_type Content-Type]
        attribute :content_disposition, aliases: %w[content_disposition Content-Disposition]
        attribute :etag,            aliases: %w[hash Etag]
        attribute :last_modified,   aliases: %w[last_modified Last-Modified], type: :time
        attribute :access_control_allow_origin, aliases: ["Access-Control-Allow-Origin"]
        attribute :origin, aliases: ["Origin"]

        def body
          attributes[:body] ||= if last_modified
                                  collection.get(identity).body
                                else
                                  ""
                                end
        end

        def body=(new_body)
          attributes[:body] = new_body
        end

        attr_reader :directory

        def copy(target_directory_key, target_file_key, options = {})
          requires :directory, :key
          options["Content-Type"] ||= content_type if content_type
          options["Access-Control-Allow-Origin"] ||= access_control_allow_origin if access_control_allow_origin
          options["Origin"] ||= origin if origin
          service.copy_object(directory.key, key, target_directory_key, target_file_key, options)
          target_directory = service.directories.new(key: target_directory_key)
          target_directory.files.get(target_file_key)
        end

        def destroy
          requires :directory, :key
          service.delete_object(directory.key, key)
          true
        end

        def metadata
          @metadata ||= headers_to_metadata
        end

        def owner=(new_owner)
          if new_owner
            attributes[:owner] = {
              display_name: new_owner["DisplayName"],
              id: new_owner["ID"]
            }
          end
        end

        def public=(new_public)
          new_public
        end

        # Get a url for file.
        #
        #     required attributes: key
        #
        # @param expires [String] number of seconds (since 1970-01-01 00:00) before url expires
        # @param options [Hash]
        # @return [String] url
        #
        def url(expires, options = {})
          requires :directory, :key
          service.create_temp_url(directory.key, key, expires, "GET", options)
        end

        def public_url
          requires :key
          collection.get_url(key)
        end

        def save(options = {})
          requires :body, :directory, :key
          options["Content-Type"] = content_type if content_type
          options["Content-Disposition"] = content_disposition if content_disposition
          options["Access-Control-Allow-Origin"] = access_control_allow_origin if access_control_allow_origin
          options["Origin"] = origin if origin
          options.merge!(metadata_to_headers)

          data = service.put_object(directory.key, key, body, options)
          update_attributes_from(data)
          refresh_metadata

          self.content_length = Fog::Storage.get_body_size(body)
          self.content_type ||= Fog::Storage.get_content_type(body)
          true
        end

        private

        attr_writer :directory

        def refresh_metadata
          metadata.reject! { |_k, v| v.nil? }
        end

        def headers_to_metadata
          key_map = key_mapping
          Hash[metadata_attributes.map { |k, v| [key_map[k], v] }]
        end

        def key_mapping
          key_map = metadata_attributes
          key_map.each_pair { |k, _v| key_map[k] = header_to_key(k) }
        end

        def header_to_key(opt)
          opt.gsub(metadata_prefix, "").split("-").map { |k| k[0, 1].downcase + k[1..-1] }.join("_").to_sym
        end

        def metadata_to_headers
          header_map = header_mapping
          Hash[metadata.map { |k, v| [header_map[k], v] }]
        end

        def header_mapping
          header_map = metadata.dup
          header_map.each_pair { |k, _v| header_map[k] = key_to_header(k) }
        end

        def key_to_header(key)
          metadata_prefix + key.to_s.split(/[-_]/).map(&:capitalize).join("-")
        end

        def metadata_attributes
          if last_modified
            headers = service.head_object(directory.key, key).headers
            headers.select! { |k, _v| metadata_attribute?(k) }
          else
            {}
          end
        end

        def metadata_attribute?(key)
          key.to_s =~ /^#{metadata_prefix}/
        end

        def metadata_prefix
          "X-Object-Meta-"
        end

        def update_attributes_from(data)
          merge_attributes(data.headers.reject { |key, _value| %w[Content-Length Content-Type].include?(key) })
        end
      end
    end
  end
end
