require 'rails/generators/base'
require 'securerandom'
module CamaleonCms
  module Generators
    class ThemeGenerator < Rails::Generators::Base
      source_root File.expand_path('theme_template', __dir__)
      argument :theme_name, type: :string, default: 'my_theme'
      desc 'This generator create basic theme structure'

      def create_initializer_file
        theme_folder = Rails.root.join('app', 'apps', 'themes', get_theme_name)
        if behavior == :revoke
          if Dir.exist?(theme_folder)
            FileUtils.rm_rf(theme_folder)
            puts 'Theme destroyed successfully'
          else
            puts "This theme doesn't exist"
          end

        elsif Dir.exist?(theme_folder)

          puts 'This theme already exist'
        else

          theme_folder = Rails.root.join('app', 'apps', 'themes', get_theme_name)
          return puts("There is already a theme with the same name in: #{theme_folder}") if Dir.exist?(theme_folder)

          # tmp copy
          FileUtils.mkdir_p(theme_folder)
          FileUtils.copy_entry(File.join($camaleon_engine_dir, 'lib', 'generators', 'camaleon_cms', 'theme_template'),
                               theme_folder)

          # configuration
          t = fix_text(File.read(File.join(theme_folder, 'config', 'config.json')))
          File.open(File.join(theme_folder, 'config', 'config.json'), 'w') { |f| f << t }

          # helper
          t = fix_text(File.read(File.join(theme_folder, 'main_helper.rb')))
          File.open(File.join(theme_folder, 'main_helper.rb'), 'w') { |f| f << t }
          puts "Theme successfully created in: #{theme_folder}"
        end
      end

      def fix_text(text = '')
        text.gsub('themeTitle', get_theme_title).gsub('ThemeClass', get_theme_class).gsub('themeKey', get_theme_name)
      end

      def self.next_migration_number(_dir)
        Time.now.utc.strftime('%Y%m%d%H%M%S')
      end

      private

      def get_theme_name
        theme_name.underscore.singularize
      end

      def get_theme_title
        theme_name.titleize
      end

      def get_theme_class
        get_theme_name.classify
      end
    end
  end
end