# frozen_string_literal: true

module Bullet
  module SaveWithBulletSupport
    def _create_record(*)
      super do
        Bullet::Detector::NPlusOneQuery.update_inversed_object(self)
        Bullet::Detector::NPlusOneQuery.add_impossible_object(self)
        yield(self) if block_given?
      end
    end
  end

  module ActiveRecord
    def self.enable
      require 'active_record'
      ::ActiveRecord::Base.extend(
        Module.new do
          def find_by_sql(*args, **kwargs, &block)
            result = super(*args, **kwargs, &block)
            if Bullet.start?
              if result.is_a? Array
                if result.size > 1
                  Bullet::Detector::NPlusOneQuery.add_possible_objects(result)
                  Bullet::Detector::CounterCache.add_possible_objects(result)
                elsif result.size == 1
                  Bullet::Detector::NPlusOneQuery.add_impossible_object(result.first)
                  Bullet::Detector::CounterCache.add_impossible_object(result.first)
                end
              elsif result.is_a? ::ActiveRecord::Base
                Bullet::Detector::NPlusOneQuery.add_impossible_object(result)
                Bullet::Detector::CounterCache.add_impossible_object(result)
              end
            end
            result
          end
        end
      )

      ::ActiveRecord::Base.prepend(SaveWithBulletSupport)

      ::ActiveRecord::Relation.prepend(
        Module.new do
          # if select a collection of objects, then these objects have possible to cause N+1 query.
          # if select only one object, then the only one object has impossible to cause N+1 query.
          def records
            result = super
            if Bullet.start?
              if result.first.class.name !~ /^HABTM_/
                if result.size > 1
                  Bullet::Detector::NPlusOneQuery.add_possible_objects(result)
                  Bullet::Detector::CounterCache.add_possible_objects(result)
                elsif result.size == 1
                  Bullet::Detector::NPlusOneQuery.add_impossible_object(result.first)
                  Bullet::Detector::CounterCache.add_impossible_object(result.first)
                end
              end
            end
            result
          end
        end
      )

      ::ActiveRecord::Associations::Preloader::Batch.prepend(
        Module.new do
          def call
            if Bullet.start?
              @preloaders.each do |preloader|
                preloader.records.each { |record|
                  Bullet::Detector::Association.add_object_associations(record, preloader.associations)
                }
                Bullet::Detector::UnusedEagerLoading.add_eager_loadings(preloader.records, preloader.associations)
              end
            end
            super
          end
        end
      )

      ::ActiveRecord::Associations::Preloader::Branch.prepend(
        Module.new do
          def preloaders_for_reflection(reflection, reflection_records)
            if Bullet.start?
              reflection_records.compact!
              if reflection_records.first.class.name !~ /^HABTM_/
                reflection_records.each { |record|
                  Bullet::Detector::Association.add_object_associations(record, reflection.name)
                }
                Bullet::Detector::UnusedEagerLoading.add_eager_loadings(reflection_records, reflection.name)
              end
            end
            super
          end
        end
      )

      ::ActiveRecord::Associations::Preloader::ThroughAssociation.prepend(
        Module.new do
          def source_preloaders
            if Bullet.start? && !defined?(@source_preloaders)
              preloaders = super
              preloaders.each do |preloader|
                reflection_name = preloader.send(:reflection).name
                preloader.send(:owners).each do |owner|
                  Bullet::Detector::NPlusOneQuery.call_association(owner, reflection_name)
                end
              end
            else
              super
            end
          end

          def through_preloaders
            if Bullet.start? && !defined?(@through_preloaders)
              preloaders = super
              preloaders.each do |preloader|
                reflection_name = preloader.send(:reflection).name
                preloader.send(:owners).each do |owner|
                  Bullet::Detector::NPlusOneQuery.call_association(owner, reflection_name)
                end
              end
            else
              super
            end
          end
        end
      )

      ::ActiveRecord::Associations::JoinDependency.prepend(
        Module.new do
          def instantiate(*args, **kwargs, &block)
            @bullet_eager_loadings = {}
            records = super(*args, **kwargs, &block)

            if Bullet.start?
              @bullet_eager_loadings.each do |_klazz, eager_loadings_hash|
                objects = eager_loadings_hash.keys
                Bullet::Detector::UnusedEagerLoading.add_eager_loadings(
                  objects,
                  eager_loadings_hash[objects.first].to_a
                )
              end
            end
            records
          end

          def construct(*args, **kwargs, &block)
            ar_parent, parent, row = args
            if Bullet.start?
              unless ar_parent.nil?
                parent.children.each do |node|
                  key = aliases.column_alias(node, node.primary_key)
                  id = row[key]
                  next unless id.nil?

                  associations = [node.reflection.name]
                  if node.reflection.through_reflection?
                    associations << node.reflection.through_reflection.name
                  end
                  associations.each do |association|
                    Bullet::Detector::Association.add_object_associations(ar_parent, association)
                    Bullet::Detector::NPlusOneQuery.call_association(ar_parent, association)
                    @bullet_eager_loadings[ar_parent.class] ||= {}
                    @bullet_eager_loadings[ar_parent.class][ar_parent] ||= Set.new
                    @bullet_eager_loadings[ar_parent.class][ar_parent] << association
                  end
                end
              end
            end

            super(*args, **kwargs, &block)
          end

          # call join associations
          def construct_model(*args, **kwargs, &block)
            record, node = args
            result = super(*args, **kwargs, &block)

            if Bullet.start?
              associations = [node.reflection.name]
              if node.reflection.through_reflection?
                associations << node.reflection.through_reflection.name
              end
              associations.each do |association|
                Bullet::Detector::Association.add_object_associations(record, association)
                Bullet::Detector::NPlusOneQuery.call_association(record, association)
                @bullet_eager_loadings[record.class] ||= {}
                @bullet_eager_loadings[record.class][record] ||= Set.new
                @bullet_eager_loadings[record.class][record] << association
              end
            end

            result
          end
        end
      )

      ::ActiveRecord::Associations::Association.prepend(
        Module.new do
          def inversed_from(record)
            if Bullet.start?
              Bullet::Detector::NPlusOneQuery.add_inversed_object(owner, reflection.name)
            end
            super
          end

          def inversed_from_queries(record)
            if Bullet.start? && inversable?(record)
              Bullet::Detector::NPlusOneQuery.add_inversed_object(owner, reflection.name)
            end
            super
          end
        end
      )

      ::ActiveRecord::Associations::CollectionAssociation.prepend(
        Module.new do
          def load_target
            records = super

            if Bullet.start?
              if is_a? ::ActiveRecord::Associations::ThroughAssociation
                association = owner.association(reflection.through_reflection.name)
                if association.loaded?
                  Bullet::Detector::NPlusOneQuery.call_association(owner, reflection.through_reflection.name)
                  Array.wrap(association.target).each do |through_record|
                    Bullet::Detector::NPlusOneQuery.call_association(through_record, source_reflection.name)
                  end

                  if reflection.through_reflection != through_reflection
                    Bullet::Detector::NPlusOneQuery.call_association(owner, through_reflection.name)
                  end
                end
              end
              Bullet::Detector::NPlusOneQuery.call_association(owner, reflection.name)
              if records.first.class.name !~ /^HABTM_/
                if records.size > 1
                  Bullet::Detector::NPlusOneQuery.add_possible_objects(records)
                  Bullet::Detector::CounterCache.add_possible_objects(records)
                elsif records.size == 1
                  Bullet::Detector::NPlusOneQuery.add_impossible_object(records.first)
                  Bullet::Detector::CounterCache.add_impossible_object(records.first)
                end
              end
            end
            records
          end

          def empty?
            if Bullet.start? && !reflection.has_cached_counter?
              Bullet::Detector::NPlusOneQuery.call_association(owner, reflection.name, caller_locations)
            end
            super
          end

          def include?(object)
            Bullet::Detector::NPlusOneQuery.call_association(owner, reflection.name, caller_locations) if Bullet.start?
            super
          end
        end
      )

      ::ActiveRecord::Associations::SingularAssociation.prepend(
        Module.new do
          # call has_one and belongs_to associations
          def reader
            result = super

            if Bullet.start?
              if owner.class.name !~ /^HABTM_/
                if is_a? ::ActiveRecord::Associations::ThroughAssociation
                  Bullet::Detector::NPlusOneQuery.call_association(owner, reflection.through_reflection.name)
                  association = owner.association(reflection.through_reflection.name)
                  Array.wrap(association.target).each do |through_record|
                    Bullet::Detector::NPlusOneQuery.call_association(through_record, source_reflection.name)
                  end

                  if reflection.through_reflection != through_reflection
                    Bullet::Detector::NPlusOneQuery.call_association(owner, through_reflection.name)
                  end
                end
                Bullet::Detector::NPlusOneQuery.call_association(owner, reflection.name)

                if Bullet::Detector::NPlusOneQuery.impossible?(owner)
                  Bullet::Detector::NPlusOneQuery.add_impossible_object(result) if result
                else
                  Bullet::Detector::NPlusOneQuery.add_possible_objects(result) if result
                end
              end
            end
            result
          end
        end
      )

      ::ActiveRecord::Associations::HasManyAssociation.prepend(
        Module.new do
          def empty?
            if Bullet.start? && !reflection.has_cached_counter?
              Bullet::Detector::NPlusOneQuery.call_association(owner, reflection.name, caller_locations)
            end
            super
          end

          def count_records
            result = reflection.has_cached_counter?
            if Bullet.start? && !result && !is_a?(::ActiveRecord::Associations::ThroughAssociation)
              Bullet::Detector::CounterCache.add_counter_cache(owner, reflection.name)
            end
            super
          end
        end
      )

      ::ActiveRecord::Associations::CollectionProxy.prepend(
        Module.new do
          def count(column_name = nil)
            if Bullet.start? && !proxy_association.is_a?(::ActiveRecord::Associations::ThroughAssociation)
              Bullet::Detector::CounterCache.add_counter_cache(
                proxy_association.owner,
                proxy_association.reflection.name
              )
              Bullet::Detector::NPlusOneQuery.call_association(
                proxy_association.owner,
                proxy_association.reflection.name,
                caller_locations
              )
            end
            super(column_name)
          end
        end
      )
    end
  end
end