######################################################################
#                         ENVIRONMENT CHECKS
#
# Sets up a first-pass environment check for the deployment.
#
# First, an environment MUST be present in order for any deployment
# to happen.  It's a safety measure that this is explicitly stated.
#
# It also checks to make sure that the :application environment
# variable has been set.
#
# This happens before any of the capabilities have been added to the
# deployment and therefore that is all we know to check for at this
# point.
#
######################################################################
Capistrano::Configuration.instance(:must_exist).load do
  on      :start,                         'environment:variable:check',  :except => ['staging', 'production']
  before  'deploy',                       'environment:deployment:check'
  before  'deploy:cold',                  'environment:deployment:check'
  before  'deploy:subzero',               'environment:deployment:check'

  after   'environment:variable:check',   'capabilities:variable:check',    'notifiers:variable:check'
  after   'environment:deployment:check', 'capabilities:deployment:check',  'notifiers:deployment:check'

  namespace :environment do
    namespace :variable do
      desc "[internal] Checks for environment variables shared among all deployment types."
      task :check do
        abort "You need to specify staging or production when you deploy. ie 'cap staging db:backup'" unless exists?(:rails_env)
        abort "You need to specify a deployment type in your application's 'deploy.rb' file. ie 'set :deployment_type, :heroku'" unless exists?(:deployment_type)

        required_variables = [
          :application
        ]

        verify_variables(required_variables)
      end
    end

    namespace :deployment do
      desc "[internal] Attempts to ensure the deployment will be successful prior to attempting it."
      task :check do
        # Empty
      end
    end
  end
end