require 'erb'

module OEHClient

	module Helper

		module Request

			ONE_PROTOCOL 			= "https://"
			THUNDERHEAD_DOMAIN 		= ".thunderhead.com"
			ONE_URI_PART 			= "/one/oauth1"

			API_URI_PART 			= "/rt/api"
			API_VERSION 			= "/2.0"

			POST_METHOD				= "post"
			PUT_METHOD				= "put"

			# request_url builds the target request URL with the passed parameters, URL encoding the parameters
			#  as necessary to create a valid request
			def self.format_url(url, params)

				# for each of the parameters, build a single query parameter string
				parameter_part = ""
				params.each do |key, value|
					# if there is more than one argument, add the apppropriate separator (&) between 
					#  query parameters
					parameter_part << "&" if (parameter_part.length > 0)
					# URL Encode the value of the property
					parameter_part << "#{key.to_s}=#{ERB::Util.url_encode(value)}"

				end
				# return the fully-qualified URL with parameters (if passsed)
				(parameter_part.length > 0 ? "#{url}?#{parameter_part}" : "#{url}")

			end

			# default_JSON_header is the default header that is passed to any OEH Request if not provided explicitly by the 
			#  calling methods
			def self.default_JSON_header()
				{'Accept' => 'application/json' , 'Content-Type' =>'application/json', 'X-Requested-With' => 'XMLHttpRequest' }
			end


		end  # module Request

		module Response

			# determine if the string that was passed is valid JSON syntax and can be parsed by the the 
			# ActiveSupport::JSON.decode method
			def self.valid_json?(json)
  				valid_indicator = true
  				begin
    				ActiveSupport::JSON.decode(json)
  				rescue ActiveSupport::JSON.parse_error
    				valid_indicator = false
  				end
  			end


			def self.handle(rest_response)

				valid_response_codes = [100, 200, 204, 302]
				# raise a generic HTTPRequestException if the the status code is not 100 (Continue) or 200 (OK)
				raise OEHClient::Exception::HTTPRequestException.new("HTTP Request Exception with code #{rest_response.code}", rest_response.code) unless (valid_response_codes.include?(rest_response.code))

				api_response = Hash.new

				api_response[:body] 	= (rest_response.code == 204 ? {} : (OEHClient::Helper::Response.valid_json?(rest_response.body) ? ActiveSupport::JSON.decode(rest_response.body) : rest_response.body))
				api_response[:cookies] 	= rest_response.cookies

				api_response

			end

		end # module Response


		module Timestamp

			# convert the time value from a Time, DateTime, String, or Integer to a proper ONE timestamp value
			# format (UTC Milliseconds)
			def self.to_one_timestamp(timevalue)

				one_timestamp = timevalue												if (timevalue.is_a?(Integer))
				one_timestamp = timevalue.utc.strftime("%s%L").to_i 					if (timevalue.is_a?(Time) || timevalue.is_a?(DateTime))
				one_timestamp = Time.parse(timevalue).utc.strftime("%s%L").to_i 		if (timevalue.is_a?(String))

				one_timestamp

			end

		end

	end

end