namespace :slack do
  desc 'Notify Slack of a deployment via the incoming webhooks integration - ' \
       ':slack_subdomain and :slack_token must be set'
  task :notify_started do
    run_locally do
      info 'Notifying Slack of deploy starting'
      set :time_started, Time.now.to_i
      execute :curl, '-X POST', '--data-urlencode',
        Slackify::Payload.build(self, fetch(:slack_deploy_starting_text)),
        fetch(:slack_url)
    end
  end
  before 'deploy:starting', 'slack:notify_started'

  desc 'Notify Slack of a deployment via the incoming webhooks integration - ' \
       ':slack_subdomain and :slack_token must be set'
  task :notify_finished do
    run_locally do
      info 'Notifying Slack of deploy finished'
      set :time_finished, Time.now.to_i
      execute :curl, '-X POST', '--data-urlencode',
        Slackify::Payload.build(self, fetch(:slack_text)),
        fetch(:slack_url)
    end
  end
  after 'deploy:finished', 'slack:notify_finished'

  desc 'Notify Slack of a deployment failure via the incoming webhooks ' \
       'integration - :slack_subdomain and :slack_token must be set'
  task :notify_failed do
    run_locally do
      info 'Notifying Slack of deploy failed'
      set :time_finished, Time.now.to_i
      execute :curl, '-X POST', '--data-urlencode',
        Slackify::Payload.build(self, fetch(:slack_deploy_failed_text)),
        fetch(:slack_url)
    end
  end
  after 'deploy:failed', 'slack:notify_failed'
end

namespace :load do
  task :defaults do
    set :slack_channel, '#general'
    set :slack_username, 'Capistrano'
    set :slack_emoji, ':ghost:'
    set :slack_parse, 'default'
    set :slack_user, -> { local_user.strip }
    set :slack_url, -> { fail ':slack_url is not set' }
    set :slack_text, lambda {
      time_elapsed = Integer(fetch(:time_finished) - fetch(:time_started))
      "Revision #{fetch(:current_revision, fetch(:branch))} of " \
      "#{fetch(:application)} deployed to #{fetch(:stage)} by #{fetch(:slack_user)} " \
      "in #{time_elapsed} seconds."
    }
    set :slack_deploy_starting_text, -> {
      "#{fetch(:stage)} deploy starting with revision/branch #{fetch(:current_revision, fetch(:branch))} for #{fetch(:application)}"
    }
    set :slack_deploy_failed_text, -> {
      "#{fetch(:stage)} deploy of #{fetch(:application)} with revision/branch #{fetch(:current_revision, fetch(:branch))} failed"
    }
  end
end