require 'rails/generators'
require 'rails/generators/migration'

module Blacklight
  class UserGenerator < Rails::Generators::Base
    include Rails::Generators::Migration

    source_root File.expand_path('../templates', __FILE__)

    argument     :model_name, :type => :string , :default => "user"
    class_option :devise    , :type => :boolean, :default => false, :aliases => "-d", :desc => "Use Devise as authentication logic (this is default)."

    desc <<-EOS
      This generator makes the following changes to your application:
       1. Creates a devise-based user model
       2. Injects blacklight-specific behavior into your user model
    EOS
    # Install Devise?
    def generate_devise_assets
      if options[:devise]
        if ENV['RAILS_VERSION'] =~ /^5\.0/ || ENV['RAILS_VERSION'] == 'edge'
          gem 'devise', github: 'plataformatec/devise' # Need > 3.5.3
        else
          gem "devise"
        end
        gem "devise-guests", "~> 0.5"

        Bundler.with_clean_env do
          run "bundle install"
        end

        generate "devise:install"
        generate "devise", model_name.classify
        generate "devise_guests", model_name.classify

        # add the #to_s to the model.
        insert_into_file("app/models/#{model_name}.rb", before: /end(\n| )*$/) do
          "\n  # Method added by Blacklight; Blacklight uses #to_s on your\n" \
          "  # user class to get a user-displayable login/identifier for\n" \
          "  # the account.\n" \
          "  def to_s\n" \
          "    email\n" \
          "  end\n"
        end
        gsub_file("config/initializers/devise.rb", "config.sign_out_via = :delete", "config.sign_out_via = :get")
      end
    end

    # Add Blacklight to the user model
    def inject_blacklight_user_behavior
      file_path = "app/models/#{model_name.underscore}.rb"
      if File.exist?(file_path)
        inject_into_class file_path, model_name.classify do
          "\n  if Blacklight::Utils.needs_attr_accessible?" \
          "\n    attr_accessible :email, :password, :password_confirmation" \
          "\n  end" \
          "\n  # Connects this user object to Blacklights Bookmarks." \
          "\n  include Blacklight::User\n"
        end
      else
        say_status "warning", <<-EOS.strip_heredoc, :yellow
          Blacklight authenticated user functionality not installed, as a user model
          could not be found at /app/models/user.rb. If you used a different name, 
          please re-run the migration and provide that name as an argument. E.g.:

            `rails -g blacklight:user client`
        EOS
      end
    end
  end
end