module DiscourseChat
  module Provider
    module GitterProvider
      PROVIDER_NAME = 'gitter'.freeze
      PROVIDER_ENABLED_SETTING = :chat_integration_gitter_enabled
      CHANNEL_PARAMETERS = [
        { key: "name", regex: '^\S+$', unique: true },
        { key: "webhook_url", regex: '^https://webhooks\.gitter\.im/e/\S+$', unique: true, hidden: true }
      ]

      def self.trigger_notification(post, channel)
        message = gitter_message(post)
        response = Net::HTTP.post_form(URI(channel.data['webhook_url']), message: message)
        unless response.kind_of? Net::HTTPSuccess
          error_key = nil
          raise ::DiscourseChat::ProviderError.new info: { error_key: error_key, message: message, response_body: response.body }
        end
      end

      def self.gitter_message(post)
        display_name = post.user.username
        topic = post.topic
        parent_category = topic.category.try :parent_category
        category_name = parent_category ? "[#{parent_category.name}/#{topic.category.name}]" : "[#{topic.category.name}]"

        "[__#{display_name}__ - #{topic.title} - #{category_name}](#{post.full_url})"
      end
    end
  end
end