def app_name_from_environment(env)
  case env.downcase
  when "production"
    ENV['HEROKU_APPNAME_PRODUCTION'] || "#{Rails.application.class.parent_name.underscore.gsub('_','-')}-production"
  when "staging"
    ENV['HEROKU_APPNAME_STAGING'] || "#{Rails.application.class.parent_name.underscore.gsub('_','-')}-staging"
  end
end

def push_command_from_env(env)
  case env
  when "production"
    "git push #{env} master"
  when "staging"
    # heroku requires that deployes be pushed to the master branch on heroku git repo
    "git push #{env} staging:master"
  end
end


desc 'Deploy Safely to Heroku'
task :deploy do
  env = ENV['ENV']

  abort "Please specify ENV={production|staging}" unless env

  app_name = app_name_from_environment(env)

  #take db backup first
  sh "heroku pg:backups capture --app #{app_name}"

  #push up new code release
  sh push_command_from_env(env)

  #migrate database and ensure seed values are present always (Settings, ContentMgmts)
  sh "heroku run rake db:migrate db:seed --app #{app_name}"

  #restart dynos to ensure all users get the new released version immediately
  sh "heroku restart --app #{app_name}"

  #warm up the Heroku dynos
  sh "curl -o /dev/null http://#{app_name}.herokuapp.com"
end

namespace :deploy do
  desc "Deploy to Heroku's Staging Environment"

  desc "Deploy to Heroku's Production Environment"
  task :production do
    ENV['ENV'] = "production"
    sh "git push origin master"
    Rake::Task["deploy"].invoke
  end

  task :staging do
    ENV['ENV'] = "staging"
    sh "git push origin staging"
    Rake::Task["deploy"].invoke
  end

  namespace :production do
    desc 'Quick Deploy to Production, without running migrations.'
    task :quick do
      ENV['ENV'] = "production"
      env = ENV['ENV']
      app_name = app_name_from_environment(env)
      Bundler.with_clean_env do
        puts `git push origin master`
        puts `git push production master`
        puts `heroku restart --app app_name`
      end
    end
  end

  namespace :staging do
    desc 'Quick Deploy to Staging, without running migrations.'
    task :quick do
      ENV['ENV'] = "staging"
      env = ENV['ENV']
      app_name = app_name_from_environment(env)
      Bundler.with_clean_env do
        puts `git push origin staging`
        puts `git push staging staging:master`
        puts `heroku restart --app app_name`
      end
    end
  end
end