module Plutonium
  module SimpleForm
    module AttachmentComponent
      def attachment(_wrapper_options = nil)
        maybe_setup_direct_uploads

        template.content_tag :div, class: "attachment-input-previews" do
          # This is a hack to support the removal of has_one_attached attachments
          # Usually, no hidden field is inserted for these
          # By inserting one, with a value of nil, when the form is submitted,
          # the autogenerated setter will remove the attachment for us.
          template.concat @builder.hidden_field(attribute_name, value: nil, multiple: multiple?)

          next if value.nil?

          template.concat begin
            template.display_attachment_value value, identity_class: input_class, caption: caption? do |attachment|
              [
                # These hidden fields allow us to preserve the already uploaded files.
                # For has_one_attached, it overrides the hidden field previously added
                #   (if the same input exists, the more recent one wins)
                #
                # For has_many_attached, the generated setter replaces all the existing files when the form is submitted
                # By adding hidden fields for the existing files, it allows us to append the new files
                @builder.hidden_field(attribute_name, multiple: multiple?, value: attachment.signed_id),

                # By removing this component, the hidden field is gone, which allows us to remove the files from active storage
                template.content_tag(:p, class: "text-danger m-0", role: :button,
                  data: {action: "click->attachment-preview#remove"}) do
                  template.content_tag :span, " Delete", class: "bi bi-trash"
                end
              ]
            end
          end
        end
      end

      private

      def value
        @value ||= object.send(attribute_name) if object&.respond_to?(attribute_name)
      end

      def multiple?
        options[:input_html] && options[:input_html][:multiple]
      end

      def caption?
        options.key?(:caption) ? options[:caption] : true
      end

      def maybe_setup_direct_uploads
        return unless options[:direct_upload]

        direct_upload_options = {
          data: {
            controller: :"attachment-input",
            attachment_input_identifier_value: input_class,
            attachment_input_attachment_preview_outlet: ".#{input_class}.attachment-preview",
            attachment_input_attachment_preview_container_outlet: ".#{input_class}.attachment-preview-container"
          }
        }

        {
          max_file_size: nil,
          min_file_size: nil,
          max_total_size: nil,
          max_file_num: multiple? ? nil : 1,
          min_file_num: nil,
          allowed_file_types: nil,
          required_meta_fields: nil
        }.each do |key, default_value|
          value = options.key?(key) ? options.delete(key) : default_value
          direct_upload_options[:data][:"attachment_input_#{key}_value"] = value
        end

        input_html_options.merge! direct_upload_options
      end
    end
  end
end
# Register with simple_form
SimpleForm.include_component(Plutonium::SimpleForm::AttachmentComponent)