module Fog
  module Storage

    def self.[](provider)
      self.new(:provider => provider)
    end

    def self.new(attributes)
      attributes = attributes.dup # prevent delete from having side effects
      case provider = attributes.delete(:provider).to_s.downcase.to_sym
      when :aws
        require 'fog/storage/aws'
        Fog::Storage::AWS.new(attributes)
      when :google
        require 'fog/storage/google'
        Fog::Storage::Google.new(attributes)
      when :local
        require 'fog/storage/local'
        Fog::Storage::Local.new(attributes)
      when :ninefold
        require 'fog/storage/ninefold'
        Fog::Storage::Ninefold.new(attributes)
      when :rackspace
        require 'fog/storage/rackspace'
        Fog::Storage::Rackspace.new(attributes)
      else
        raise ArgumentError.new("#{provider} is not a recognized storage provider")
      end
    end

    def self.directories
      directories = []
      for provider in [:aws, :google, :local, :ninefold, :rackspace]
        begin
          directories.concat(self[provider].directories)
        rescue # ignore any missing credentials/etc
        end
      end
      directories
    end

    def self.get_body_size(body)
      if body.respond_to?(:force_encoding)
        body.force_encoding('BINARY')
      end
      if body.respond_to?(:bytesize)
        body.bytesize
      elsif body.respond_to?(:size)
        body.size
      elsif body.respond_to?(:stat)
        body.stat.size
      else
        0
      end
    end

    def self.parse_data(data)
      metadata = {
        :body => nil,
        :headers => {}
      }

      metadata[:body] = data
      metadata[:headers]['Content-Length'] = get_body_size(data)

      if data.respond_to?(:path) and !data.path.nil?
        filename = ::File.basename(data.path)
        unless (mime_types = MIME::Types.of(filename)).empty?
          metadata[:headers]['Content-Type'] = mime_types.first.content_type
        end
      end
      # metadata[:headers]['Content-MD5'] = Base64.encode64(Digest::MD5.digest(metadata[:body])).strip
      metadata
    end

  end
end