# Capistrano tasks for the initial setup

namespace :deploy do

  desc 'Creates and initialises a new foodsoft instance'
  task :initial do
    before 'deploy:check:linked_files', 'deploy:initial:touch_shared'
    before 'deploy:symlink:linked_files', 'deploy:initial:copy_shared'
    before 'deploy:updated', 'deploy:initial:secret_token'
    before 'deploy:updated', 'deploy:initial:app_config'
    before 'deploy:updated', 'deploy:initial:db:config'
    before 'deploy:updated', 'deploy:initial:db:create'
    before 'deploy:migrate', 'deploy:initial:db:load'
  end
  after :initial, :deploy


  namespace :initial do

    namespace :db do

      desc 'Generate new database.yml with random password'
      task :config => ['deploy:set_rails_env'] do
        require 'securerandom'
        on roles(:app), in: :groups do
          db_name = (fetch(:db_user) or fetch(:application))
          db_passwd = SecureRandom.urlsafe_base64(24).to_s
          db_yaml = {
            fetch(:rails_env).to_s => {
              'adapter' => 'mysql2',
              'encoding' => 'utf8',
              'database' => db_name,
              'username' => db_name,
              'password' => db_passwd,
            }
          }
          execute :mkdir, '-p', shared_path.join("config")
          upload! StringIO.new(db_yaml.to_yaml), shared_path.join("config/database.yml")
        end
      end

      # assumes mysql access setup (~/.my.cnf), with permissions
      desc 'Create database new database'
      task :create => ['deploy:set_rails_env'] do
        on roles(:app), in: :sequence do
          config = capture :cat, shared_path.join("config/database.yml")
          config = YAML.load(config)[fetch(:rails_env).to_s]
          # http://www.grahambrooks.com/blog/create-mysql-database-with-capistrano/
          execute :mysql, "--execute='CREATE DATABASE IF NOT EXISTS `#{config['database']}`';"
          execute :mysql, "--execute='GRANT ALL ON `#{config['database']}`.* TO \"#{config['username']}\" IDENTIFIED BY \"#{config['password']}\";'"
        end
      end

      desc 'Load database schema'
      task :load => ['deploy:set_rails_env'] do
        on roles(:app), in: :groups do
          # workaround nonexistent release_path on first deploy
          path = releases_path.join(capture(:ls, releases_path).split("\n").sort.last)
          within path do
            with rails_env: fetch(:rails_env) do
              execute :rake, 'db:schema:load'
            end
          end
        end
      end
    end

    desc 'Writes a new secret token'
    task :secret_token do
      require 'securerandom'
      on roles(:app), in: :groups do
        secret = SecureRandom.hex(64)
        text = "Foodsoft::Application.config.secret_key_base = \"#{secret}\""
        execute :mkdir, '-p', shared_path.join("config/initializers")
        upload! StringIO.new(text), shared_path.join("config/initializers/secret_token.rb")
      end
    end

    desc 'Creates a default app_config.yml'
    task :app_config do
      on roles(:app), in: :groups do
        execute :mkdir, '-p', shared_path.join("config")
        # workaround nonexistent release_path on first deploy
        path = releases_path.join(capture(:ls, releases_path).split("\n").sort.last)
        execute :cp, path.join("config/app_config.yml.SAMPLE"), shared_path.join("config/app_config.yml")
      end
    end

    desc 'Touches the shared configuration files (for initial deploy)'
    task :touch_shared do
      on roles(:app), in: :groups do
        fetch(:linked_files).each do |file|
          execute :touch, shared_path.join(file)
        end
      end
    end

    desc 'Copies existing shared configuration files'
    task :copy_shared do
      on roles(:app), in: :groups do
        # workaround nonexistent release_path on first deploy
        path = releases_path.join(capture(:ls, releases_path).split("\n").sort.last)
        fetch(:linked_files).each do |file|
          # TODO copy only if existing destination has zero length
          execute "if [ -e '#{path.join(file)}' ]; then cp '#{path.join(file)}' '#{shared_path.join(file)}'; fi"
        end
      end
    end

  end

end