module HexTokenBot
  module ChannelApi
    module Bter
      module Request
        extend self
        PUBLIC_URL = 'https://data.bter.com/api2/1'
        TRADE_URL  = 'https://bter.com/api2/1/private'

        private
        def public_request(method, pair='', tid=nil)
          pair = pair + "/#{tid}" if tid.nil? == false
          response = HTTParty.get("#{PUBLIC_URL}/#{method}/#{pair}").body
          make_hash(response)
        end

        def trade_request(method, params=nil)
          if params.nil?
            @params = {:method => method}
          else
            @params = {:method => method}
            params.each do |param|
              @params.merge!(param)
            end
          end
          response = HTTParty.post(
              "#{TRADE_URL}/#{method}",
              :body => @params,
              :headers => {
                  'KEY' => @key,
                  'Sign' => sign,
                  "Content-type" => "application/x-www-form-urlencoded",
                  "Accept" => "application/x-www-form-urlencoded"
              }
          ).body
          make_hash(response)
        end

        def sign
          hmac = OpenSSL::HMAC.new(@secret,OpenSSL::Digest::SHA512.new)
          @params = @params.collect {|k,v| "#{k}=#{v}"}.join('&')
          hmac.update(@params).to_s
        end

        def make_hash(json_object)
          JSON.parse(json_object, {:symbolize_names => true})
        end
      end
    end
  end
end