# A representation of a Neopets::CustomPets viewer data response, translated
# to DTI's database models!
class Pet::ModelingSnapshot
  def initialize(viewer_data_hash)
    @custom_pet = viewer_data_hash[:custom_pet]
    @object_info_registry = viewer_data_hash[:object_info_registry]
    @object_asset_registry = viewer_data_hash[:object_asset_registry]
  end

  def pet_type
    @pet_type ||= begin
      raise Pet::UnexpectedDataFormat unless @custom_pet[:species_id]
      raise Pet::UnexpectedDataFormat unless @custom_pet[:color_id]
      raise Pet::UnexpectedDataFormat unless @custom_pet[:body_id]

      @custom_pet => {species_id:, color_id:}
      PetType.find_or_initialize_by(species_id:, color_id:).tap do |pet_type|
        # Apply the pet's body ID to the pet type, unless it's wearing an alt
        # style, in which case ignore it, because it's the *alt style*'s body ID.
        # (This can theoretically cause a problem saving a new pet type when
        # there's an alt style too!)
        pet_type.body_id = @custom_pet[:body_id] unless @custom_pet[:alt_style]
        if pet_type.body_id.nil?
          raise Pet::UnexpectedDataFormat,
            "can't process alt style on first occurrence of pet type"
        end

        # Try using this pet for the pet type's thumbnail, but don't worry
        # if it fails.
        begin
          pet_type.consider_pet_image(@custom_pet[:name])
        rescue => error
          Rails.logger.warn "Failed to load pet image: #{error.full_message}"
        end
      end
    end
  end

  def pet_state
    @pet_state ||= begin
      swf_asset_ids = biology_assets.map(&:remote_id)
      pet_type.pet_states.find_or_initialize_by(swf_asset_ids:).tap do |pet_state|
        pet_state.swf_assets = biology_assets
      end
    end
  end

  def alt_style
    @alt_style ||= begin
      return nil unless @custom_pet[:alt_style]
      raise Pet::UnexpectedDataFormat unless @custom_pet[:alt_color]

      id = @custom_pet[:alt_style].to_i
      AltStyle.find_or_initialize_by(id:).tap do |alt_style|
        alt_style.assign_attributes(
          color_id: @custom_pet[:alt_color].to_i,
          species_id: @custom_pet[:species_id].to_i,
          body_id: @custom_pet[:body_id].to_i,
          swf_assets: alt_style_assets,
        )
      end
    end
  end

  def items
    @items ||= @object_info_registry.map do |id, item_data|
      Item.find_or_initialize_by(id:).tap do |item|
        item.add_origin_registry_info item_data
        item.swf_assets = item_assets_for id
      end
    end
  end

  private

  def biology_assets
    @biology_assets ||= begin
      biology = @custom_pet[:alt_style].present? ?
        @custom_pet[:original_biology] :
        @custom_pet[:biology_by_zone]
      assets_from_biology(biology)
    end
  end

  def item_assets_for(item_id)
    all_infos = @object_asset_registry.values
    infos = all_infos.select { |a| a[:obj_info_id].to_i == item_id.to_i }
    infos.map do |asset_data|
      SwfAsset.from_object_data(@custom_pet[:body_id], asset_data)
    end
  end

  def alt_style_assets
    raise Pet::UnexpectedDataFormat if @custom_pet[:biology_by_zone].empty?
    @alt_style_assets ||= assets_from_biology(@custom_pet[:biology_by_zone])
  end

  def assets_from_biology(biology)
    raise Pet::UnexpectedDataFormat if biology.empty?
    body_id = @custom_pet[:body_id].to_i
    biology.values.map { |b| SwfAsset.from_biology_data(body_id, b) }
  end
end