namespace :okei do

  def app
    @app ||= (
      Rake::Task.task_defined?("railties:install:migrations") ? "" : "app:"
    )
  end

  desc "Installs the units gem into rails application"
  task install: %w(dependencies:install db:migrate) do
    system "rake routes:mount" if app.blank?
  end

  namespace :db do

    desc "Copies and runs db migrations from okei gem"
    task migrate: %w(install:migrations environment) do
      system "rake db:migrate SCOPE=okei RAILS_ENV=#{ Rails.env }"
    end
  end

  namespace :install do

    desc "Copies migrations from okei gem to application"
    task :migrations do
      Rake::Task["#{ app }railties:install:migrations"].reenable
      Rake::Task["#{ app }okei:install:migrations"].invoke
    end
  end

  namespace :dependencies do

    desc "Installs gem dependencies"
    task :install do
      system "rake #{ app }corrector:install"
      Rake::Task["#{ app }railties:install:migrations"].reenable
      system "rake #{ app }uuids:install"
    end
  end

  namespace :routes do

    desc "Mounts units API routes"
    task :mount do
      insert_into_file(
        "config/routes.rb",
        before: "\nend",
        line:   "\n\n  mount Okei::Engine => \"/okei\"",
        engine: "Okei::Engine"
      )
    end

    def insert_into_file(name, before:, line:, engine:)
      text = File.read(name)
      return if text[engine]
      File.write name, text.gsub(before, line << before)
    end
  end

  namespace :test do

    desc "Prepares spec environment"
    task prepare: %w(cache:prepare) do
      system "rake db:migrate RAILS_ENV=test"
    end
  end

  namespace :cache do

    desc "Creates spec/dummy/temp/cache folder"
    task :prepare do
      system "mkdir spec/dummy/tmp/cache -p -v"
    end
  end
end