module EasyPost::Util

# File lib/easypost/util.rb, line 9
def self.get_lowest_object_rate(easypost_object, carriers = [], services = [], rates_key = 'rates')
  lowest_rate = nil

  carriers = EasyPost::InternalUtilities.normalize_string_list(carriers)
  negative_carriers = []
  carriers_copy = carriers.clone
  carriers_copy.each do |carrier|
    if carrier[0, 1] == '!'
      negative_carriers << carrier[1..]
      carriers.delete(carrier)
    end
  end

  services = EasyPost::InternalUtilities.normalize_string_list(services)
  negative_services = []
  services_copy = services.clone
  services_copy.each do |service|
    if service[0, 1] == '!'
      negative_services << service[1..]
      services.delete(service)
    end
  end

  easypost_object.send(rates_key).each do |rate|
    rate_carrier = rate.carrier.downcase
    if carriers.size.positive? && !carriers.include?(rate_carrier)
      next
    end
    if negative_carriers.size.positive? && negative_carriers.include?(rate_carrier)
      next
    end

    rate_service = rate.service.downcase
    if services.size.positive? && !services.include?(rate_service)
      next
    end
    if negative_services.size.positive? && negative_services.include?(rate_service)
      next
    end

    if lowest_rate.nil? || rate.rate.to_f < lowest_rate.rate.to_f
      lowest_rate = rate
    end
  end

  if lowest_rate.nil?
    raise EasyPost::Errors::FilteringError.new(EasyPost::Constants::NO_MATCHING_RATES)
  end

  lowest_rate
end

# File lib/easypost/util.rb, line 121
def self.get_lowest_smart_rate(smart_rates, delivery_days, delivery_accuracy)
  valid_delivery_accuracy_values = Set[
    'percentile_50',
    'percentile_75',
    'percentile_85',
    'percentile_90',
    'percentile_95',
    'percentile_97',
    'percentile_99',
  ]
  lowest_smart_rate = nil

  unless valid_delivery_accuracy_values.include?(delivery_accuracy.downcase)
    raise EasyPost::Errors::InvalidParameterError.new(
      'delivery_accuracy',
      "Must be one of: #{valid_delivery_accuracy_values}",
    )
  end

  smart_rates.each do |rate|
    next if rate['time_in_transit'][delivery_accuracy] > delivery_days.to_i

    if lowest_smart_rate.nil? || rate['rate'].to_f < lowest_smart_rate['rate'].to_f
      lowest_smart_rate = rate
    end
  end

  if lowest_smart_rate.nil?
    raise EasyPost::Errors::FilteringError.new(EasyPost::Constants::NO_MATCHING_RATES)
  end

  lowest_smart_rate
end

# File lib/easypost/util.rb, line 63
def self.get_lowest_stateless_rate(stateless_rates, carriers = [], services = [])
  lowest_rate = nil

  carriers = EasyPost::InternalUtilities.normalize_string_list(carriers)
  negative_carriers = []
  carriers_copy = carriers.clone
  carriers_copy.each do |carrier|
    if carrier[0, 1] == '!'
      negative_carriers << carrier[1..]
      carriers.delete(carrier)
    end
  end

  services = EasyPost::InternalUtilities.normalize_string_list(services)
  negative_services = []
  services_copy = services.clone
  services_copy.each do |service|
    if service[0, 1] == '!'
      negative_services << service[1..]
      services.delete(service)
    end
  end

  stateless_rates.each do |rate|
    rate_carrier = rate.carrier.downcase
    if carriers.size.positive? && !carriers.include?(rate_carrier)
      next
    end
    if negative_carriers.size.positive? && negative_carriers.include?(rate_carrier)
      next
    end

    rate_service = rate.service.downcase
    if services.size.positive? && !services.include?(rate_service)
      next
    end
    if negative_services.size.positive? && negative_services.include?(rate_service)
      next
    end

    if lowest_rate.nil? || rate.rate.to_f < lowest_rate.rate.to_f
      lowest_rate = rate
    end
  end

  if lowest_rate.nil?
    raise EasyPost::Errors::FilteringError.new(EasyPost::Constants::NO_MATCHING_RATES)
  end

  lowest_rate
end

# File lib/easypost/util.rb, line 116
def self.receive_event(raw_input)
  EasyPost::InternalUtilities::Json.convert_json_to_object(JSON.parse(raw_input), EasyPost::Models::EasyPostObject)
end

# File lib/easypost/util.rb, line 159
def self.validate_webhook(event_body, headers, webhook_secret)
  easypost_hmac_signature = headers['X-Hmac-Signature']

  if easypost_hmac_signature.nil?
    raise EasyPost::Errors::SignatureVerificationError.new(EasyPost::Constants::WEBHOOK_MISSING_SIGNATURE)
  end

  encoded_webhook_secret = webhook_secret.unicode_normalize(:nfkd).encode('utf-8')

  expected_signature = OpenSSL::HMAC.hexdigest('sha256', encoded_webhook_secret, event_body)
  digest = "hmac-sha256-hex=#{expected_signature}"
  unless digest == easypost_hmac_signature
    raise EasyPost::Errors::SignatureVerificationError.new(EasyPost::Constants::WEBHOOK_SIGNATURE_MISMATCH)
  end

  JSON.parse(event_body)
end