#
# Obtain energy prices from Entsoe (transparancy platform)
# See https://transparency.entsoe.eu/content/static_content/Static%20content/web%20api/Guide.html
#

require 'open-uri'
require 'nokogiri'

class Entsoe 
  
  URL = 'https://transparency.entsoe.eu'

  def initialize(api_key)
    @api_key = api_key
  end
  
  def day_ahead_prices(date)
    start_date = date.beginning_of_day
    end_date = date.end_of_day
    
    # A44 - Document type => Price Document
    # A01 - Process type => Day Ahead
    # NL =  '10YNL----------L'
    
    domain = '10YNL----------L'      
    url = URL + "/api?securityToken=%s&documentType=A44&processType=A01&in_Domain=%s&out_Domain=%s&periodStart=%s&periodEnd=%s" % [@api_key, domain, domain, start_date.iso8601, end_date.iso8601]
    p url
  end
  
  private
  
    def base_request(url)
      doc = Nokogiri::XML(URI.open(url))
    end 
end