module Hoptoad
  module V2
    def self.process_notice(parsed)
      for_errbit_api(
        normalize(
          rekey(parsed)))
    end

  private

    def self.rekey(node)
      case node
      when Hash
        if node.key?('var') && node.key?('key')
          { normalize_key(node['key']) => rekey(node['var']) }
        elsif node.key?('var')
          rekey(node['var'])
        elsif node.key?('__content__') && node.key?('key')
          { normalize_key(node['key']) => rekey(node['__content__']) }
        elsif node.key?('__content__')
          rekey(node['__content__'])
        elsif node.key?('key')
          { normalize_key(node['key']) => nil }
        else
          node.inject({}) do |rekeyed, (key, val)|
            rekeyed.merge(normalize_key(key) => rekey(val))
          end
        end
      when Array
        if node.first.key?('key')
          node.inject({}) do |rekeyed, keypair|
            rekeyed.merge(rekey(keypair))
          end
        else
          node.map { |n| rekey(n) }
        end
      else
        node
      end
    end

    def self.normalize_key(key)
      key.tr('.', '_')
    end

    def self.normalize(notice)
      error = notice['error']
      backtrace = error['backtrace']
      backtrace['line'] = [backtrace['line']] unless backtrace['line'].is_a?(Array)

      notice['request'] ||= {}
      notice['request']['component']  = 'unknown' if notice['request']['component'].blank?
      notice['request']['action']     = nil       if notice['request']['action'].blank?

      notice
    end

    def self.for_errbit_api(notice)
      {
        error_class:        notice['error']['class'] || notice['error']['key'],
        message:            notice['error']['message'],
        backtrace:          notice['error']['backtrace']['line'],

        request:            notice['request'],
        server_environment: notice['server-environment'],

        api_key:            notice['api-key'],
        notifier:           notice['notifier'],
        # 'current-user' from airbrake, 'user-attributes' from airbrake_user_attributes gem
        user_attributes:    notice['current-user'] || notice['user-attributes'] || {},
        framework:          notice['framework']
      }
    end
  end
end