require "mail"

class ReadingsMailer
    
  SSL_OPTS = {
                :openssl_verify_mode => OpenSSL::SSL::VERIFY_NONE,
  }  
  
  # IMAP_OPTS = { :address    => "mail.van-halteren.net",
                                # :port       => 993,
                                # :user_name  => 'aart@van-halteren.net',
                                # :password   => 'XXXXX',
                                # :openssl_verify_mode => OpenSSL::SSL::VERIFY_NONE,
                                # :enable_ssl => true
  # }
                              
  #
  # Class methods
  #
  class << self
    def deliver      
    # Read SMTP options from smtp.yml
    smtp_opts = YAML::load(File.open('config/smtp.yml')).symbolize_keys
    smtp_opts.merge!(SSL_OPTS) if smtp_opts[:ssl] && smtp_opts[:ssl_verify_mode].eql?("none")
    
    # Fetch today's usage
    usage_today = Reading.diff_on(Date.today)
    c = Cost.new
    oxxio_cost = c.oxxio_energy_cost(Date.today.to_s,usage_today[:total_kwh_consumed_high]-usage_today[:total_kwh_produced_high], usage_today[:total_kwh_consumed_low]-usage_today[:total_kwh_produced_low])
    easy_cost = c.easy_energy_cost_barplot(Date.today) # side effect: generates a PNG
    
    mail = Mail.new do
        delivery_method :smtp, smtp_opts
        to      'a.t.van.halteren@vu.nl'
        from    'SmartMeter <aart@van-halteren.net>'
        subject "SmartMeter report for #{Date.today}"

        text_part do
          body "Summary for #{Date.today}\n
                -------------------------------\n\n
                Total kWH electricity consumed: #{usage_today[:total_kwh_consumed_high] + usage_today[:total_kwh_consumed_low]}\n
                Total kWH electricity produced:  #{usage_today[:total_kwh_produced_high] + usage_today[:total_kwh_produced_low]}\n
                Total m3 gas consumed: #{usage_today[:total_m3_gas_consumed]}\n\n
                kWH cost (Oxxio): EUR #{ oxxio_cost }\n
                kWH cost (EasyEnergy): EUR #{ easy_cost }\n
               "
        end
      
        html_part do
          content_type 'text/html; charset=UTF-8'
          body "<h1>Summary for #{Date.today}</h1>" +
               "<p>Total kWH electricity consumed: #{usage_today[:total_kwh_consumed_high] + usage_today[:total_kwh_consumed_low]}</p>" +
               "<p>Total kWH electricity produced:  #{usage_today[:total_kwh_produced_high] + usage_today[:total_kwh_produced_low]}</p>" +
               "<p>Total m3 gas consumed: #{usage_today[:total_m3_gas_consumed]}</p>" +
               "</br>" +
               "<p>kWH cost (Oxxio): EUR #{ oxxio_cost} </p>" +
               "<p>kWH cost (EasyEnergy): EUR #{ easy_cost} </p>"
        end  
      end
      
      mail.deliver!
    end
  end   
end