class ViewComponent::Collection

def collection_variable(object)
  if object.respond_to?(:to_ary)
    object.to_ary
  else
    raise ArgumentError.new("The value of the argument isn't a valid collection. Make sure it responds to to_ary: #{object.inspect}")
  end
end

def component_options(item, iterator)
  item_options = { @component.collection_parameter => item }
  item_options[@component.collection_counter_parameter] = iterator.index + 1 if @component.counter_argument_present?
  @options.merge(item_options)
end

def initialize(component, object, **options)
  @component = component
  @collection = collection_variable(object || [])
  @options = options
end

def render_in(view_context, &block)
  iterator = ActionView::PartialIteration.new(@collection.size)
  @component.compile(raise_errors: true)
  @component.validate_collection_parameter!(validate_default: true)
  @collection.map do |item|
    content = @component.new(**component_options(item, iterator)).render_in(view_context, &block)
    iterator.iterate!
    content
  end.join.html_safe
end