module RequestSessionPersistable

# File app/models/concerns/request_session_persistable.rb, line 11
def initialize(request_session:, **attributes)
  @request_session = request_session

  stored_attributes = @request_session[request_session_key] || {}

  super({})

  assign_attributes(stored_attributes.slice(*attribute_names))
  assign_attributes(attributes)

  clear_changes_information

  # When we call `clear_changes_information` we seem to lose time zone
  # information. This happens somewhere in the Rails internals, and
  # it seems to be easier to undo this here.

  self.attributes.each do |key, value|
    self[key] = value.in_time_zone if value.is_a?(Time)
  end
end

# File app/models/concerns/request_session_persistable.rb, line 86
def [](attr)
  public_send(attr)
end

# File app/models/concerns/request_session_persistable.rb, line 90
def []=(attr, value)
  public_send("#{attr}=", value)
end

# File app/models/concerns/request_session_persistable.rb, line 32
def assign_attributes(new_attributes)
  super(new_attributes)

  # When assigning multi-parameter dates, time zone information is lost and
  # the date ends up being assigned with the right values but in UTC. This
  # converts the time to local time (Europe/London) but keeping the time
  # components the same. For example: 12:00 UTC -> 12:00 BST.

  attributes.each do |key, value|
    self[key] = Time.zone.local_to_utc(value).in_time_zone if value.is_a?(
      Time
    )
  end
end

# File app/models/concerns/request_session_persistable.rb, line 98
def clear!
  clear_attributes
  save!(context: :create)
end

# File app/models/concerns/request_session_persistable.rb, line 94
def clear_attributes
  attribute_names.each { |attribute| self[attribute] = nil }
end

# File app/models/concerns/request_session_persistable.rb, line 47
def reset_unused_attributes
  # This can be overridden to provide a before_save callback which can be
  # used to clear any responses from branching questions where the user has
  # gone back and edited their answers meaning they're no longer relevant.
end

# File app/models/concerns/request_session_persistable.rb, line 53
def save(context: :update)
  reset_unused_attributes
  return false if invalid?(context)

  @request_session[request_session_key] = attributes.each_with_object(
    {}
  ) do |(key, value), hash|
    type = self.class.type_for_attribute(key)

    hash[key] = if type.is_a?(ActiveRecord::Type::Serialized)
      type.coder.dump(value)
    else
      value
    end
  end

  true
end

# File app/models/concerns/request_session_persistable.rb, line 72
def save!(context: :update)
  raise RecordInvalid unless save(context:)
end

# File app/models/concerns/request_session_persistable.rb, line 76
def update(...)
  assign_attributes(...)
  save(context: :update) # rubocop:disable Rails/SaveBang
end

# File app/models/concerns/request_session_persistable.rb, line 81
def update!(...)
  assign_attributes(...)
  save!(context: :update)
end