require 'fog/core/collection'
require 'fog/rackspace/models/storage/file'

module Fog
  module Storage
    class Rackspace

      class Files < Fog::Collection

        attribute :directory
        attribute :limit
        attribute :marker
        attribute :path
        attribute :prefix

        model Fog::Storage::Rackspace::File

        def all(options = {})
          requires :directory
          options = {
            'limit'   => limit,
            'marker'  => marker,
            'path'    => path,
            'prefix'  => prefix
          }.merge!(options)
          merge_attributes(options)
          parent = directory.collection.get(
            directory.key,
            options
          )
          if parent
            load(parent.files.map {|file| file.attributes})
          else
            nil
          end
        end

        alias :each_file_this_page :each
        def each
          if !block_given?
            self
          else
            subset = dup.all

            subset.each_file_this_page {|f| yield f}
            while subset.length == (subset.limit || 10000)
              subset = subset.all(:marker => subset.last.key)
              subset.each_file_this_page {|f| yield f}
            end

            self
          end
        end

        def get(key, &block)
          requires :directory
          data = service.get_object(directory.key, key, &block)
          metadata = Metadata.from_headers(data.headers)  
          file_data = data.headers.merge({
            :body => data.body,
            :key  => key,
            :metadata => metadata
          })
          
          new(file_data)
        rescue Fog::Storage::Rackspace::NotFound
          nil
        end

        def get_url(key)
          requires :directory
          if self.directory.public_url
            Files::file_url directory.public_url, key
          end
        end
        
        def head(key, options = {})
          requires :directory
          data = service.head_object(directory.key, key)
          file_data = data.headers.merge({
            :key => key
          })
          new(file_data)
        rescue Fog::Storage::Rackspace::NotFound
          nil
        end

        def new(attributes = {})
          requires :directory
          super({ :directory => directory }.merge!(attributes))
        end

        def self.file_url(path, key)
          return nil unless path
          "#{path}/#{Fog::Rackspace.escape(key, '/')}"
        end

      end
    end
  end
end