class Integrations::Slack::ChannelBuilder
  attr_reader :params, :channel

  def initialize(params)
    @params = params
  end

  def perform
    find_or_create_channel
    update_reference_id
  end

  private

  def hook
    @hook ||= params[:hook]
  end

  def slack_client
    Slack.configure do |config|
      config.token = hook.access_token
    end
    Slack::Web::Client.new
  end

  def find_or_create_channel
    exisiting_channel = slack_client.conversations_list.channels.find { |channel| channel['name'] == params[:channel] }
    @channel = exisiting_channel || slack_client.conversations_create(name: params[:channel])['channel']
  end

  def update_reference_id
    @hook.update(reference_id: channel['id'])
  end
end