class Jekyll::PluginManager

def self.gemfile_exists?
  File.file?("Gemfile") || (ENV["BUNDLE_GEMFILE"] && File.file?(ENV["BUNDLE_GEMFILE"]))
end

def self.require_from_bundler
  if !ENV["JEKYLL_NO_BUNDLER_REQUIRE"] && gemfile_exists?
    require "bundler"
    Bundler.setup
    required_gems = Bundler.require(:jekyll_plugins)
    message = "Required #{required_gems.map(&:name).join(", ")}"
    Jekyll.logger.debug("PluginManager:", message)
    ENV["JEKYLL_NO_BUNDLER_REQUIRE"] = "true"
    true
  else
    false
  end
end

def conscientious_require
  require_theme_deps if site.theme
  require_plugin_files
  require_gems
  deprecation_checks
end

def deprecation_checks
  pagination_included = (site.config["plugins"] || []).include?("jekyll-paginate") ||
    defined?(Jekyll::Paginate)
  if site.config["paginate"] && !pagination_included
    Jekyll::Deprecator.deprecation_message <<~MSG
      You appear to have pagination turned on, but you haven't included the `jekyll-paginate`
      gem. Ensure you have `plugins: [jekyll-paginate]` in your configuration file.
    MSG
  end
end

def initialize(site)
  @site = site
end

def plugin_allowed?(plugin_name)
  !site.safe || whitelist.include?(plugin_name)
end

def plugins_path
  if site.config["plugins_dir"].eql? Jekyll::Configuration::DEFAULTS["plugins_dir"]
    [site.in_source_dir(site.config["plugins_dir"])]
  else
    Array(site.config["plugins_dir"]).map { |d| File.expand_path(d) }
  end
end

def require_gems
  Jekyll::External.require_with_graceful_fail(
    site.gems.select { |plugin| plugin_allowed?(plugin) }
  )
end

def require_plugin_files
  unless site.safe
    plugins_path.each do |plugin_search_path|
      plugin_files = Utils.safe_glob(plugin_search_path, File.join("**", "*.rb"))
      Jekyll::External.require_with_graceful_fail(plugin_files)
    end
  end
end

def require_theme_deps
  return false unless site.theme.runtime_dependencies
  site.theme.runtime_dependencies.each do |dep|
    next if dep.name == "jekyll"
    External.require_with_graceful_fail(dep.name) if plugin_allowed?(dep.name)
  end
end

def whitelist
  @whitelist ||= Array[site.config["whitelist"]].flatten
end