require 'rails/generators'

class ZenboxGenerator < Rails::Generators::Base

  class_option :api_key, :aliases => "-k", :type => :string, :desc => "Your Zenbox API key"
  class_option :heroku, :type => :boolean, :desc => "Use the Heroku addon to provide your Zenbox API key"
  class_option :app, :aliases => "-a", :type => :string, :desc => "Your Heroku app name (only required if deploying to >1 Heroku app)"

  def self.source_root
    @_zenbox_source_root ||= File.expand_path("../../../../../generators/zenbox/templates", __FILE__)
  end

  def install
    ensure_api_key_was_configured
    ensure_plugin_is_not_present
    append_capistrano_hook
    generate_initializer unless api_key_configured?
    determine_api_key if heroku?
    test_zenbox
  end

  private

  def ensure_api_key_was_configured
    if !options[:api_key] && !options[:heroku] && !api_key_configured?
      puts "Must pass --api-key or --heroku or create config/initializers/zenbox.rb"
      exit
    end
  end

  def ensure_plugin_is_not_present
    if plugin_is_present?
      puts "You must first remove the zenbox plugin. Please run: script/plugin remove zenbox"
      exit
    end
  end

  def append_capistrano_hook
    if File.exists?('config/deploy.rb') && File.exists?('Capfile')
      append_file('config/deploy.rb', <<-HOOK)

        require './config/boot'
        require 'zenbox/capistrano'
      HOOK
    end
  end

  def api_key_expression
    s = if options[:api_key]
      "'#{options[:api_key]}'"
    elsif options[:heroku]
      "ENV['ZENBOX_API_KEY']"
    end
  end

  def generate_initializer
    template 'initializer.rb', 'config/initializers/zenbox.rb'
  end

  def determine_api_key
    puts "Attempting to determine your API key from Heroku..."
    ENV['ZENBOX_API_KEY'] = heroku_api_key
    if ENV['ZENBOX_API_KEY'].blank?
      puts "... Failed."
      puts "WARNING: We were unable to detect the Zenbox API key from your Heroku environment."
      puts "Your Heroku application environment may not be configured correctly."
      exit 1
    else
      puts "... Done."
      puts "Heroku's Zenbox API key is '#{ENV['ZENBOX_API_KEY']}'"
    end
  end

  def heroku_var(var,app_name = nil)
    app = app_name ? "--app #{app_name}" : ''
    `heroku config #{app} | grep -E "#{var.upcase}" | awk '{ print $3; }'`.strip
  end

  def heroku_api_key
    heroku_var("zenbox_api_key",options[:app]).split.find {|x| x unless x.blank?}
  end

  def heroku?
    options[:heroku] ||
      system("grep ZENBOX_API_KEY config/initializers/zenbox.rb") ||
      system("grep ZENBOX_API_KEY config/environment.rb")
  end

  def api_key_configured?
    File.exists?('config/initializers/zenbox.rb')
  end

  def test_zenbox
    run("rake zenbox:test --trace")
  end

  def plugin_is_present?
    File.exists?('vendor/plugins/zenbox')
  end
end