namespace :okei do

  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

    desc "Dismounts units API routes"
    task :dismount do
      remove_from_file "config/routes.rb", "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

    def remove_from_file(name, text)
      temp = File.read(name).split("\n").reject { |line| line[text] }.join("\n")
      File.write(name, temp)
    end
  end

  namespace :db do

    desc "Creates and runs units API migrations"
    task :add do
      sh "rake okei:install:migrations"
      sh "rake db:migrate SCOPE=okei"
    end

    desc "Rolls back units API migrations"
    task :rollback do
      sh "rake db:rollback SCOPE=okei STEP=4"
    end

    desc "Removes units API db tables and migrations"
    task drop: :rollback do
      sh "rm db/migrate/*.okei.rb"
    end
  end

  desc "Mounts the units gem into rails application"
  task install: %w(db:migrate routes:mount)

  desc "Uninstalls the units gem from rails application"
  task uninstall: %w(routes:dismount db:drop)
end