require "cases/helper"
require "models/owner"
require "models/pet"
require "models/topic"

class TransactionCallbacksTest < ActiveRecord::TestCase
  fixtures :topics, :owners, :pets

  class ReplyWithCallbacks < ActiveRecord::Base
    self.table_name = :topics

    belongs_to :topic, foreign_key: "parent_id"

    validates_presence_of :content

    after_commit :do_after_commit, on: :create

    attr_accessor :save_on_after_create
    after_create do
      save! if save_on_after_create
    end

    def history
      @history ||= []
    end

    def do_after_commit
      history << :commit_on_create
    end
  end

  class TopicWithCallbacks < ActiveRecord::Base
    self.table_name = :topics

    has_many :replies, class_name: "ReplyWithCallbacks", foreign_key: "parent_id"

    before_commit { |record| record.do_before_commit(nil) }
    after_commit { |record| record.do_after_commit(nil) }
    after_create_commit { |record| record.do_after_commit(:create) }
    after_update_commit { |record| record.do_after_commit(:update) }
    after_destroy_commit { |record| record.do_after_commit(:destroy) }
    after_rollback { |record| record.do_after_rollback(nil) }
    after_rollback(on: :create) { |record| record.do_after_rollback(:create) }
    after_rollback(on: :update) { |record| record.do_after_rollback(:update) }
    after_rollback(on: :destroy) { |record| record.do_after_rollback(:destroy) }

    def history
      @history ||= []
    end

    def before_commit_block(on = nil, &block)
      @before_commit ||= {}
      @before_commit[on] ||= []
      @before_commit[on] << block
    end

    def after_commit_block(on = nil, &block)
      @after_commit ||= {}
      @after_commit[on] ||= []
      @after_commit[on] << block
    end

    def after_rollback_block(on = nil, &block)
      @after_rollback ||= {}
      @after_rollback[on] ||= []
      @after_rollback[on] << block
    end

    def do_before_commit(on)
      blocks = @before_commit[on] if defined?(@before_commit)
      blocks.each { |b| b.call(self) } if blocks
    end

    def do_after_commit(on)
      blocks = @after_commit[on] if defined?(@after_commit)
      blocks.each { |b| b.call(self) } if blocks
    end

    def do_after_rollback(on)
      blocks = @after_rollback[on] if defined?(@after_rollback)
      blocks.each { |b| b.call(self) } if blocks
    end
  end

  def setup
    @first = TopicWithCallbacks.find(1)
  end

  # FIXME: Test behavior, not implementation.
  def test_before_commit_exception_should_pop_transaction_stack
    @first.before_commit_block { raise "better pop this txn from the stack!" }

    original_txn = @first.class.connection.current_transaction

    begin
      @first.save!
      fail
    rescue
      assert_equal original_txn, @first.class.connection.current_transaction
    end
  end

  def test_call_after_commit_after_transaction_commits
    @first.after_commit_block { |r| r.history << :after_commit }
    @first.after_rollback_block { |r| r.history << :after_rollback }

    @first.save!
    assert_equal [:after_commit], @first.history
  end

  def test_only_call_after_commit_on_update_after_transaction_commits_for_existing_record
    add_transaction_execution_blocks @first

    @first.save!
    assert_equal [:commit_on_update], @first.history
  end

  def test_only_call_after_commit_on_destroy_after_transaction_commits_for_destroyed_record
    add_transaction_execution_blocks @first

    @first.destroy
    assert_equal [:commit_on_destroy], @first.history
  end

  def test_only_call_after_commit_on_create_after_transaction_commits_for_new_record
    new_record = TopicWithCallbacks.new(title: "New topic", written_on: Date.today)
    add_transaction_execution_blocks new_record

    new_record.save!
    assert_equal [:commit_on_create], new_record.history
  end

  def test_only_call_after_commit_on_create_after_transaction_commits_for_new_record_if_create_succeeds_creating_through_association
    topic = TopicWithCallbacks.create!(title: "New topic", written_on: Date.today)
    reply = topic.replies.create

    assert_equal [], reply.history
  end

  def test_only_call_after_commit_on_create_and_doesnt_leaky
    r = ReplyWithCallbacks.new(content: "foo")
    r.save_on_after_create = true
    r.save!
    r.content = "bar"
    r.save!
    r.save!
    assert_equal [:commit_on_create], r.history
  end

  def test_only_call_after_commit_on_update_after_transaction_commits_for_existing_record_on_touch
    add_transaction_execution_blocks @first

    @first.touch
    assert_equal [:commit_on_update], @first.history
  end

  def test_only_call_after_commit_on_top_level_transactions
    @first.after_commit_block { |r| r.history << :after_commit }
    assert @first.history.empty?

    @first.transaction do
      @first.transaction(requires_new: true) do
        @first.touch
      end
      assert @first.history.empty?
    end
    assert_equal [:after_commit], @first.history
  end

  def test_call_after_rollback_after_transaction_rollsback
    @first.after_commit_block { |r| r.history << :after_commit }
    @first.after_rollback_block { |r| r.history << :after_rollback }

    Topic.transaction do
      @first.save!
      raise ActiveRecord::Rollback
    end

    assert_equal [:after_rollback], @first.history
  end

  def test_only_call_after_rollback_on_update_after_transaction_rollsback_for_existing_record
    add_transaction_execution_blocks @first

    Topic.transaction do
      @first.save!
      raise ActiveRecord::Rollback
    end

    assert_equal [:rollback_on_update], @first.history
  end

  def test_only_call_after_rollback_on_update_after_transaction_rollsback_for_existing_record_on_touch
    add_transaction_execution_blocks @first

    Topic.transaction do
      @first.touch
      raise ActiveRecord::Rollback
    end

    assert_equal [:rollback_on_update], @first.history
  end

  def test_only_call_after_rollback_on_destroy_after_transaction_rollsback_for_destroyed_record
    add_transaction_execution_blocks @first

    Topic.transaction do
      @first.destroy
      raise ActiveRecord::Rollback
    end

    assert_equal [:rollback_on_destroy], @first.history
  end

  def test_only_call_after_rollback_on_create_after_transaction_rollsback_for_new_record
    new_record = TopicWithCallbacks.new(title: "New topic", written_on: Date.today)
    add_transaction_execution_blocks new_record

    Topic.transaction do
      new_record.save!
      raise ActiveRecord::Rollback
    end

    assert_equal [:rollback_on_create], new_record.history
  end

  def test_call_after_rollback_when_commit_fails
    @first.after_commit_block { |r| r.history << :after_commit }
    @first.after_rollback_block { |r| r.history << :after_rollback }

    assert_raises RuntimeError do
      @first.transaction do
        tx = @first.class.connection.transaction_manager.current_transaction
        def tx.commit
          raise
        end

        @first.save
      end
    end

    assert_equal [:after_rollback], @first.history
  end

  def test_only_call_after_rollback_on_records_rolled_back_to_a_savepoint
    def @first.rollbacks(i = 0); @rollbacks ||= 0; @rollbacks += i if i; end
    def @first.commits(i = 0); @commits ||= 0; @commits += i if i; end
    @first.after_rollback_block { |r| r.rollbacks(1) }
    @first.after_commit_block { |r| r.commits(1) }

    second = TopicWithCallbacks.find(3)
    def second.rollbacks(i = 0); @rollbacks ||= 0; @rollbacks += i if i; end
    def second.commits(i = 0); @commits ||= 0; @commits += i if i; end
    second.after_rollback_block { |r| r.rollbacks(1) }
    second.after_commit_block { |r| r.commits(1) }

    Topic.transaction do
      @first.save!
      Topic.transaction(requires_new: true) do
        second.save!
        raise ActiveRecord::Rollback
      end
    end

    assert_equal 1, @first.commits
    assert_equal 0, @first.rollbacks
    assert_equal 0, second.commits
    assert_equal 1, second.rollbacks
  end

  def test_only_call_after_rollback_on_records_rolled_back_to_a_savepoint_when_release_savepoint_fails
    def @first.rollbacks(i = 0); @rollbacks ||= 0; @rollbacks += i if i; end
    def @first.commits(i = 0); @commits ||= 0; @commits += i if i; end

    @first.after_rollback_block { |r| r.rollbacks(1) }
    @first.after_commit_block { |r| r.commits(1) }

    Topic.transaction do
      @first.save
      Topic.transaction(requires_new: true) do
        @first.save!
        raise ActiveRecord::Rollback
      end
      Topic.transaction(requires_new: true) do
        @first.save!
        raise ActiveRecord::Rollback
      end
    end

    assert_equal 1, @first.commits
    assert_equal 2, @first.rollbacks
  end

  def test_after_commit_callback_should_not_swallow_errors
    @first.after_commit_block { fail "boom" }
    assert_raises(RuntimeError) do
      Topic.transaction do
        @first.save!
      end
    end
  end

  def test_after_commit_callback_when_raise_should_not_restore_state
    first = TopicWithCallbacks.new
    second = TopicWithCallbacks.new
    first.after_commit_block { fail "boom" }
    second.after_commit_block { fail "boom" }

    begin
      Topic.transaction do
        first.save!
        assert_not_nil first.id
        second.save!
        assert_not_nil second.id
      end
    rescue
    end
    assert_not_nil first.id
    assert_not_nil second.id
    assert first.reload
  end

  def test_after_rollback_callback_should_not_swallow_errors_when_set_to_raise
    error_class = Class.new(StandardError)
    @first.after_rollback_block { raise error_class }
    assert_raises(error_class) do
      Topic.transaction do
        @first.save!
        raise ActiveRecord::Rollback
      end
    end
  end

  def test_after_rollback_callback_when_raise_should_restore_state
    error_class = Class.new(StandardError)

    first = TopicWithCallbacks.new
    second = TopicWithCallbacks.new
    first.after_rollback_block { raise error_class }
    second.after_rollback_block { raise error_class }

    begin
      Topic.transaction do
        first.save!
        assert_not_nil first.id
        second.save!
        assert_not_nil second.id
        raise ActiveRecord::Rollback
      end
    rescue error_class
    end
    assert_nil first.id
    assert_nil second.id
  end

  def test_after_rollback_callbacks_should_validate_on_condition
    assert_raise(ArgumentError) { Topic.after_rollback(on: :save) }
    e = assert_raise(ArgumentError) { Topic.after_rollback(on: "create") }
    assert_match(/:on conditions for after_commit and after_rollback callbacks have to be one of \[:create, :destroy, :update\]/, e.message)
  end

  def test_after_commit_callbacks_should_validate_on_condition
    assert_raise(ArgumentError) { Topic.after_commit(on: :save) }
    e = assert_raise(ArgumentError) { Topic.after_commit(on: "create") }
    assert_match(/:on conditions for after_commit and after_rollback callbacks have to be one of \[:create, :destroy, :update\]/, e.message)
  end

  def test_saving_a_record_with_a_belongs_to_that_specifies_touching_the_parent_should_call_callbacks_on_the_parent_object
    pet   = Pet.first
    owner = pet.owner
    flag = false

    owner.on_after_commit do
      flag = true
    end

    pet.name = "Fluffy the Third"
    pet.save

    assert flag
  end

  private

    def add_transaction_execution_blocks(record)
      record.after_commit_block(:create) { |r| r.history << :commit_on_create }
      record.after_commit_block(:update) { |r| r.history << :commit_on_update }
      record.after_commit_block(:destroy) { |r| r.history << :commit_on_destroy }
      record.after_rollback_block(:create) { |r| r.history << :rollback_on_create }
      record.after_rollback_block(:update) { |r| r.history << :rollback_on_update }
      record.after_rollback_block(:destroy) { |r| r.history << :rollback_on_destroy }
    end
end

class CallbacksOnMultipleActionsTest < ActiveRecord::TestCase
  self.use_transactional_tests = false

  class TopicWithCallbacksOnMultipleActions < ActiveRecord::Base
    self.table_name = :topics

    after_commit(on: [:create, :destroy]) { |record| record.history << :create_and_destroy }
    after_commit(on: [:create, :update]) { |record| record.history << :create_and_update }
    after_commit(on: [:update, :destroy]) { |record| record.history << :update_and_destroy }

    before_commit(if: :save_before_commit_history) { |record| record.history << :before_commit }
    before_commit(if: :update_title) { |record| record.update(title: "before commit title") }

    def clear_history
      @history = []
    end

    def history
      @history ||= []
    end

    attr_accessor :save_before_commit_history, :update_title
  end

  def test_after_commit_on_multiple_actions
    topic = TopicWithCallbacksOnMultipleActions.new
    topic.save
    assert_equal [:create_and_update, :create_and_destroy], topic.history

    topic.clear_history
    topic.approved = true
    topic.save
    assert_equal [:update_and_destroy, :create_and_update], topic.history

    topic.clear_history
    topic.destroy
    assert_equal [:update_and_destroy, :create_and_destroy], topic.history
  end

  def test_before_commit_actions
    topic = TopicWithCallbacksOnMultipleActions.new
    topic.save_before_commit_history = true
    topic.save

    assert_equal [:before_commit, :create_and_update, :create_and_destroy], topic.history
  end

  def test_before_commit_update_in_same_transaction
    topic = TopicWithCallbacksOnMultipleActions.new
    topic.update_title = true
    topic.save

    assert_equal "before commit title", topic.title
    assert_equal "before commit title", topic.reload.title
  end
end

class TransactionEnrollmentCallbacksTest < ActiveRecord::TestCase
  class TopicWithoutTransactionalEnrollmentCallbacks < ActiveRecord::Base
    self.table_name = :topics

    before_commit_without_transaction_enrollment { |r| r.history << :before_commit }
    after_commit_without_transaction_enrollment { |r| r.history << :after_commit }
    after_rollback_without_transaction_enrollment { |r| r.history << :rollback }

    def history
      @history ||= []
    end
  end

  def setup
    @topic = TopicWithoutTransactionalEnrollmentCallbacks.create!
  end

  def test_commit_does_not_run_transactions_callbacks_without_enrollment
    @topic.transaction do
      @topic.content = "foo"
      @topic.save!
    end
    assert @topic.history.empty?
  end

  def test_commit_run_transactions_callbacks_with_explicit_enrollment
    @topic.transaction do
      2.times do
        @topic.content = "foo"
        @topic.save!
      end
      @topic.class.connection.add_transaction_record(@topic)
    end
    assert_equal [:before_commit, :after_commit], @topic.history
  end

  def test_rollback_does_not_run_transactions_callbacks_without_enrollment
    @topic.transaction do
      @topic.content = "foo"
      @topic.save!
      raise ActiveRecord::Rollback
    end
    assert @topic.history.empty?
  end

  def test_rollback_run_transactions_callbacks_with_explicit_enrollment
    @topic.transaction do
      2.times do
        @topic.content = "foo"
        @topic.save!
      end
      @topic.class.connection.add_transaction_record(@topic)
      raise ActiveRecord::Rollback
    end
    assert_equal [:rollback], @topic.history
  end
end