# frozen_string_literal: true

module Mcp
  module Tools
    module CreateTemplate
      SCHEMA = {
        name: 'create_template',
        title: 'Create Template',
        description: 'Create a document template. Provide a URL to upload a PDF/DOCX file, or provide only a name ' \
                     'to create an empty template and receive an edit URL where the file can be uploaded via the UI.',
        inputSchema: {
          type: 'object',
          properties: {
            name: {
              type: 'string',
              description: 'Template name (used as the template name and required when url is not provided)'
            },
            url: {
              type: 'string',
              description: 'Optional URL of a PDF or DOCX file to upload. If omitted, an empty template is ' \
                           'created and the returned edit_url can be used to upload a file via the UI.'
            }
          },
          required: %w[name]
        },
        annotations: {
          readOnlyHint: false,
          destructiveHint: false,
          idempotentHint: false,
          openWorldHint: false
        }
      }.freeze

      module_function

      # rubocop:disable Metrics/AbcSize, Metrics/MethodLength
      def call(arguments, current_user, current_ability)
        current_ability.authorize!(:create, Template.new(account_id: current_user.account_id, author: current_user))

        account = current_user.account

        template = Template.new(
          account:,
          author: current_user,
          folder: account.default_template_folder,
          name: arguments['name'].to_s.presence || 'New Template',
          fields: [],
          schema: []
        )

        if arguments['url'].present?
          tempfile = Tempfile.new
          tempfile.binmode
          tempfile.write(DownloadUtils.call(arguments['url'], validate: true).body)
          tempfile.rewind

          filename = File.basename(URI.decode_www_form_component(arguments['url']))

          file = ActionDispatch::Http::UploadedFile.new(
            tempfile:,
            filename:,
            type: Marcel::MimeType.for(tempfile)
          )

          template.name = arguments['name'].presence || File.basename(filename, '.*')
          template.save!

          documents, = Templates::CreateAttachments.call(template, { files: [file] }, extract_fields: true)
          schema = documents.map { |doc| { attachment_uuid: doc.uuid, name: doc.filename.base } }

          if template.fields.blank?
            template.fields = Templates::ProcessDocument.normalize_attachment_fields(template, documents)
          end

          template.update!(schema:)
        else
          template.save!
        end

        WebhookUrls.enqueue_events(template, 'template.created')

        SearchEntries.enqueue_reindex(template)

        {
          content: [
            {
              type: 'text',
              text: {
                id: template.id,
                name: template.name,
                edit_url: Rails.application.routes.url_helpers.edit_template_url(template,
                                                                                 **Docuseal.default_url_options)
              }.to_json
            }
          ]
        }
      end
      # rubocop:enable Metrics/AbcSize, Metrics/MethodLength
    end
  end
end