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require "cases/helper"

class CallbackDeveloper < ActiveRecord::Base
  self.table_name = 'developers'

  class << self
    def callback_string(callback_method)
      "history << [#{callback_method.to_sym.inspect}, :string]"
    end

    def callback_proc(callback_method)
      Proc.new { |model| model.history << [callback_method, :proc] }
    end

    def define_callback_method(callback_method)
      define_method(callback_method) do
        self.history << [callback_method, :method]
      end
      send(callback_method, :"#{callback_method}")
    end

    def callback_object(callback_method)
      klass = Class.new
      klass.send(:define_method, callback_method) do |model|
        model.history << [callback_method, :object]
      end
      klass.new
    end
  end

  ActiveRecord::Callbacks::CALLBACKS.each do |callback_method|
    next if callback_method.to_s =~ /^around_/
    define_callback_method(callback_method)
    send(callback_method, callback_string(callback_method))
    send(callback_method, callback_proc(callback_method))
    send(callback_method, callback_object(callback_method))
    send(callback_method) { |model| model.history << [callback_method, :block] }
  end

  def history
    @history ||= []
  end
end

class CallbackDeveloperWithFalseValidation < CallbackDeveloper
  before_validation proc { |model| model.history << [:before_validation, :returning_false]; return false }
  before_validation proc { |model| model.history << [:before_validation, :should_never_get_here] }
end

class ParentDeveloper < ActiveRecord::Base
  self.table_name = 'developers'
  attr_accessor :after_save_called
  before_validation {|record| record.after_save_called = true}
end

class ChildDeveloper < ParentDeveloper

end

class RecursiveCallbackDeveloper < ActiveRecord::Base
  self.table_name = 'developers'

  before_save :on_before_save
  after_save :on_after_save

  attr_reader :on_before_save_called, :on_after_save_called

  def on_before_save
    @on_before_save_called ||= 0
    @on_before_save_called += 1
    save unless @on_before_save_called > 1
  end

  def on_after_save
    @on_after_save_called ||= 0
    @on_after_save_called += 1
    save unless @on_after_save_called > 1
  end
end

class ImmutableDeveloper < ActiveRecord::Base
  self.table_name = 'developers'

  validates_inclusion_of :salary, :in => 50000..200000

  before_save :cancel
  before_destroy :cancel

  def cancelled?
    @cancelled == true
  end

  private
    def cancel
      @cancelled = true
      false
    end
end

class ImmutableMethodDeveloper < ActiveRecord::Base
  self.table_name = 'developers'

  validates_inclusion_of :salary, :in => 50000..200000

  def cancelled?
    @cancelled == true
  end

  before_save do
    @cancelled = true
    false
  end

  before_destroy do
    @cancelled = true
    false
  end
end

class OnCallbacksDeveloper < ActiveRecord::Base
  self.table_name = 'developers'

  before_validation { history << :before_validation }
  before_validation(:on => :create){ history << :before_validation_on_create }
  before_validation(:on => :update){ history << :before_validation_on_update }

  validate do
    history << :validate
  end

  after_validation { history << :after_validation }
  after_validation(:on => :create){ history << :after_validation_on_create }
  after_validation(:on => :update){ history << :after_validation_on_update }

  def history
    @history ||= []
  end
end

class CallbackCancellationDeveloper < ActiveRecord::Base
  self.table_name = 'developers'

  attr_reader :after_save_called, :after_create_called, :after_update_called, :after_destroy_called
  attr_accessor :cancel_before_save, :cancel_before_create, :cancel_before_update, :cancel_before_destroy

  before_save {defined?(@cancel_before_save) ? !@cancel_before_save : false}
  before_create { !@cancel_before_create }
  before_update { !@cancel_before_update }
  before_destroy { !@cancel_before_destroy }

  after_save { @after_save_called = true }
  after_update { @after_update_called = true }
  after_create { @after_create_called = true }
  after_destroy { @after_destroy_called = true }
end

class CallbacksTest < ActiveRecord::TestCase
  fixtures :developers

  def test_initialize
    david = CallbackDeveloper.new
    assert_equal [
      [ :after_initialize, :method ],
      [ :after_initialize, :string ],
      [ :after_initialize, :proc ],
      [ :after_initialize, :object ],
      [ :after_initialize, :block ],
    ], david.history
  end

  def test_find
    david = CallbackDeveloper.find(1)
    assert_equal [
      [ :after_find, :method ],
      [ :after_find, :string ],
      [ :after_find, :proc ],
      [ :after_find, :object ],
      [ :after_find, :block ],
      [ :after_initialize, :method ],
      [ :after_initialize, :string ],
      [ :after_initialize, :proc ],
      [ :after_initialize, :object ],
      [ :after_initialize, :block ],
    ], david.history
  end

  def test_new_valid?
    david = CallbackDeveloper.new
    david.valid?
    assert_equal [
      [ :after_initialize, :method ],
      [ :after_initialize, :string ],
      [ :after_initialize, :proc ],
      [ :after_initialize, :object ],
      [ :after_initialize, :block ],
      [ :before_validation, :method ],
      [ :before_validation, :string ],
      [ :before_validation, :proc ],
      [ :before_validation, :object ],
      [ :before_validation, :block ],
      [ :after_validation, :method ],
      [ :after_validation, :string ],
      [ :after_validation, :proc ],
      [ :after_validation, :object ],
      [ :after_validation, :block ],
    ], david.history
  end

  def test_existing_valid?
    david = CallbackDeveloper.find(1)
    david.valid?
    assert_equal [
      [ :after_find, :method ],
      [ :after_find, :string ],
      [ :after_find, :proc ],
      [ :after_find, :object ],
      [ :after_find, :block ],
      [ :after_initialize, :method ],
      [ :after_initialize, :string ],
      [ :after_initialize, :proc ],
      [ :after_initialize, :object ],
      [ :after_initialize, :block ],
      [ :before_validation, :method ],
      [ :before_validation, :string ],
      [ :before_validation, :proc ],
      [ :before_validation, :object ],
      [ :before_validation, :block ],
      [ :after_validation, :method ],
      [ :after_validation, :string ],
      [ :after_validation, :proc ],
      [ :after_validation, :object ],
      [ :after_validation, :block ],
    ], david.history
  end

  def test_create
    david = CallbackDeveloper.create('name' => 'David', 'salary' => 1000000)
    assert_equal [
      [ :after_initialize, :method ],
      [ :after_initialize, :string ],
      [ :after_initialize, :proc ],
      [ :after_initialize, :object ],
      [ :after_initialize, :block ],
      [ :before_validation, :method ],
      [ :before_validation, :string ],
      [ :before_validation, :proc ],
      [ :before_validation, :object ],
      [ :before_validation, :block ],
      [ :after_validation, :method ],
      [ :after_validation, :string ],
      [ :after_validation, :proc ],
      [ :after_validation, :object ],
      [ :after_validation, :block ],
      [ :before_save, :method ],
      [ :before_save, :string ],
      [ :before_save, :proc ],
      [ :before_save, :object ],
      [ :before_save, :block ],
      [ :before_create, :method ],
      [ :before_create, :string ],
      [ :before_create, :proc ],
      [ :before_create, :object ],
      [ :before_create, :block ],
      [ :after_create, :method ],
      [ :after_create, :string ],
      [ :after_create, :proc ],
      [ :after_create, :object ],
      [ :after_create, :block ],
      [ :after_save, :method ],
      [ :after_save, :string ],
      [ :after_save, :proc ],
      [ :after_save, :object ],
      [ :after_save, :block ]
    ], david.history
  end

  def test_validate_on_create
    david = OnCallbacksDeveloper.create('name' => 'David', 'salary' => 1000000)
    assert_equal [
      :before_validation,
      :before_validation_on_create,
      :validate,
      :after_validation,
      :after_validation_on_create
    ], david.history
  end

  def test_update
    david = CallbackDeveloper.find(1)
    david.save
    assert_equal [
      [ :after_find, :method ],
      [ :after_find, :string ],
      [ :after_find, :proc ],
      [ :after_find, :object ],
      [ :after_find, :block ],
      [ :after_initialize, :method ],
      [ :after_initialize, :string ],
      [ :after_initialize, :proc ],
      [ :after_initialize, :object ],
      [ :after_initialize, :block ],
      [ :before_validation, :method ],
      [ :before_validation, :string ],
      [ :before_validation, :proc ],
      [ :before_validation, :object ],
      [ :before_validation, :block ],
      [ :after_validation, :method ],
      [ :after_validation, :string ],
      [ :after_validation, :proc ],
      [ :after_validation, :object ],
      [ :after_validation, :block ],
      [ :before_save, :method ],
      [ :before_save, :string ],
      [ :before_save, :proc ],
      [ :before_save, :object ],
      [ :before_save, :block ],
      [ :before_update, :method ],
      [ :before_update, :string ],
      [ :before_update, :proc ],
      [ :before_update, :object ],
      [ :before_update, :block ],
      [ :after_update, :method ],
      [ :after_update, :string ],
      [ :after_update, :proc ],
      [ :after_update, :object ],
      [ :after_update, :block ],
      [ :after_save, :method ],
      [ :after_save, :string ],
      [ :after_save, :proc ],
      [ :after_save, :object ],
      [ :after_save, :block ]
    ], david.history
  end

  def test_validate_on_update
    david = OnCallbacksDeveloper.find(1)
    david.save
    assert_equal [
      :before_validation,
      :before_validation_on_update,
      :validate,
      :after_validation,
      :after_validation_on_update
    ], david.history
  end

  def test_destroy
    david = CallbackDeveloper.find(1)
    david.destroy
    assert_equal [
      [ :after_find, :method ],
      [ :after_find, :string ],
      [ :after_find, :proc ],
      [ :after_find, :object ],
      [ :after_find, :block ],
      [ :after_initialize, :method ],
      [ :after_initialize, :string ],
      [ :after_initialize, :proc ],
      [ :after_initialize, :object ],
      [ :after_initialize, :block ],
      [ :before_destroy, :method ],
      [ :before_destroy, :string ],
      [ :before_destroy, :proc ],
      [ :before_destroy, :object ],
      [ :before_destroy, :block ],
      [ :after_destroy, :method ],
      [ :after_destroy, :string ],
      [ :after_destroy, :proc ],
      [ :after_destroy, :object ],
      [ :after_destroy, :block ]
    ], david.history
  end

  def test_delete
    david = CallbackDeveloper.find(1)
    CallbackDeveloper.delete(david.id)
    assert_equal [
      [ :after_find, :method ],
      [ :after_find, :string ],
      [ :after_find, :proc ],
      [ :after_find, :object ],
      [ :after_find, :block ],
      [ :after_initialize, :method ],
      [ :after_initialize, :string ],
      [ :after_initialize, :proc ],
      [ :after_initialize, :object ],
      [ :after_initialize, :block ],
    ], david.history
  end

  def test_before_save_returning_false
    david = ImmutableDeveloper.find(1)
    assert david.valid?
    assert !david.save
    assert_raise(ActiveRecord::RecordNotSaved) { david.save! }

    david = ImmutableDeveloper.find(1)
    david.salary = 10_000_000
    assert !david.valid?
    assert !david.save
    assert_raise(ActiveRecord::RecordInvalid) { david.save! }

    someone = CallbackCancellationDeveloper.find(1)
    someone.cancel_before_save = true
    assert someone.valid?
    assert !someone.save
    assert_save_callbacks_not_called(someone)
  end

  def test_before_create_returning_false
    someone = CallbackCancellationDeveloper.new
    someone.cancel_before_create = true
    assert someone.valid?
    assert !someone.save
    assert_save_callbacks_not_called(someone)
  end

  def test_before_update_returning_false
    someone = CallbackCancellationDeveloper.find(1)
    someone.cancel_before_update = true
    assert someone.valid?
    assert !someone.save
    assert_save_callbacks_not_called(someone)
  end

  def test_before_destroy_returning_false
    david = ImmutableDeveloper.find(1)
    assert !david.destroy
    assert_raise(ActiveRecord::RecordNotDestroyed) { david.destroy! }
    assert_not_nil ImmutableDeveloper.find_by_id(1)

    someone = CallbackCancellationDeveloper.find(1)
    someone.cancel_before_destroy = true
    assert !someone.destroy
    assert_raise(ActiveRecord::RecordNotDestroyed) { someone.destroy! }
    assert !someone.after_destroy_called
  end

  def assert_save_callbacks_not_called(someone)
    assert !someone.after_save_called
    assert !someone.after_create_called
    assert !someone.after_update_called
  end
  private :assert_save_callbacks_not_called

  def test_callback_returning_false
    david = CallbackDeveloperWithFalseValidation.find(1)
    david.save
    assert_equal [
      [ :after_find, :method ],
      [ :after_find, :string ],
      [ :after_find, :proc ],
      [ :after_find, :object ],
      [ :after_find, :block ],
      [ :after_initialize, :method ],
      [ :after_initialize, :string ],
      [ :after_initialize, :proc ],
      [ :after_initialize, :object ],
      [ :after_initialize, :block ],
      [ :before_validation, :method ],
      [ :before_validation, :string ],
      [ :before_validation, :proc ],
      [ :before_validation, :object ],
      [ :before_validation, :block ],
      [ :before_validation, :returning_false ],
      [ :after_rollback, :block ],
      [ :after_rollback, :object ],
      [ :after_rollback, :proc ],
      [ :after_rollback, :string ],
      [ :after_rollback, :method ],
    ], david.history
  end

  def test_inheritence_of_callbacks
    parent = ParentDeveloper.new
    assert !parent.after_save_called
    parent.save
    assert parent.after_save_called

    child = ChildDeveloper.new
    assert !child.after_save_called
    child.save
    assert child.after_save_called
  end

end
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