require "active_support/core_ext/kernel/reporting"
require "active_support/file_update_checker"
require "rails/engine/configuration"
require "rails/source_annotation_extractor"

module Rails
  class Application
    class Configuration < ::Rails::Engine::Configuration
      attr_accessor :allow_concurrency, :asset_host, :autoflush_log,
                    :cache_classes, :cache_store, :consider_all_requests_local, :console,
                    :eager_load, :exceptions_app, :file_watcher, :filter_parameters,
                    :force_ssl, :helpers_paths, :logger, :log_formatter, :log_tags,
                    :railties_order, :relative_url_root, :secret_key_base, :secret_token,
                    :ssl_options, :public_file_server,
                    :session_options, :time_zone, :reload_classes_only_on_change,
                    :beginning_of_week, :filter_redirect, :x, :enable_dependency_loading,
                    :read_encrypted_secrets, :log_level

      attr_reader :encoding, :api_only

      def initialize(*)
        super
        self.encoding                    = Encoding::UTF_8
        @allow_concurrency               = nil
        @consider_all_requests_local     = false
        @filter_parameters               = []
        @filter_redirect                 = []
        @helpers_paths                   = []
        @public_file_server              = ActiveSupport::OrderedOptions.new
        @public_file_server.enabled      = true
        @public_file_server.index_name   = "index"
        @force_ssl                       = false
        @ssl_options                     = {}
        @session_store                   = nil
        @time_zone                       = "UTC"
        @beginning_of_week               = :monday
        @log_level                       = :debug
        @generators                      = app_generators
        @cache_store                     = [ :file_store, "#{root}/tmp/cache/" ]
        @railties_order                  = [:all]
        @relative_url_root               = ENV["RAILS_RELATIVE_URL_ROOT"]
        @reload_classes_only_on_change   = true
        @file_watcher                    = ActiveSupport::FileUpdateChecker
        @exceptions_app                  = nil
        @autoflush_log                   = true
        @log_formatter                   = ActiveSupport::Logger::SimpleFormatter.new
        @eager_load                      = nil
        @secret_token                    = nil
        @secret_key_base                 = nil
        @api_only                        = false
        @debug_exception_response_format = nil
        @x                               = Custom.new
        @enable_dependency_loading       = false
        @read_encrypted_secrets          = false
      end

      def load_defaults(target_version)
        case target_version.to_s
        when "5.0"
          if respond_to?(:action_controller)
            action_controller.per_form_csrf_tokens = true
            action_controller.forgery_protection_origin_check = true
          end

          ActiveSupport.to_time_preserves_timezone = true

          if respond_to?(:active_record)
            active_record.belongs_to_required_by_default = true
          end

          self.ssl_options = { hsts: { subdomains: true } }

        when "5.1"
          load_defaults "5.0"

          if respond_to?(:assets)
            assets.unknown_asset_fallback = false
          end

          if respond_to?(:action_view)
            action_view.form_with_generates_remote_forms = true
          end

        when "5.2"
          load_defaults "5.1"

          if respond_to?(:active_record)
            active_record.cache_versioning = true
          end

          if respond_to?(:action_dispatch)
            action_dispatch.use_authenticated_cookie_encryption = true
          end

        else
          raise "Unknown version #{target_version.to_s.inspect}"
        end
      end

      def encoding=(value)
        @encoding = value
        silence_warnings do
          Encoding.default_external = value
          Encoding.default_internal = value
        end
      end

      def api_only=(value)
        @api_only = value
        generators.api_only = value

        @debug_exception_response_format ||= :api
      end

      def debug_exception_response_format
        @debug_exception_response_format || :default
      end

      def debug_exception_response_format=(value)
        @debug_exception_response_format = value
      end

      def paths
        @paths ||= begin
          paths = super
          paths.add "config/database",    with: "config/database.yml"
          paths.add "config/secrets",     with: "config", glob: "secrets.yml{,.enc}"
          paths.add "config/environment", with: "config/environment.rb"
          paths.add "lib/templates"
          paths.add "log",                with: "log/#{Rails.env}.log"
          paths.add "public"
          paths.add "public/javascripts"
          paths.add "public/stylesheets"
          paths.add "tmp"
          paths
        end
      end

      # Loads and returns the entire raw configuration of database from
      # values stored in `config/database.yml`.
      def database_configuration
        path = paths["config/database"].existent.first
        yaml = Pathname.new(path) if path

        config = if yaml && yaml.exist?
          require "yaml"
          require "erb"
          loaded_yaml = YAML.load(ERB.new(yaml.read).result) || {}
          shared = loaded_yaml.delete("shared")
          if shared
            loaded_yaml.each do |_k, values|
              values.reverse_merge!(shared)
            end
          end
          Hash.new(shared).merge(loaded_yaml)
        elsif ENV["DATABASE_URL"]
          # Value from ENV['DATABASE_URL'] is set to default database connection
          # by Active Record.
          {}
        else
          raise "Could not load database configuration. No such file - #{paths["config/database"].instance_variable_get(:@paths)}"
        end

        config
      rescue Psych::SyntaxError => e
        raise "YAML syntax error occurred while parsing #{paths["config/database"].first}. " \
              "Please note that YAML must be consistently indented using spaces. Tabs are not allowed. " \
              "Error: #{e.message}"
      rescue => e
        raise e, "Cannot load `Rails.application.database_configuration`:\n#{e.message}", e.backtrace
      end

      def colorize_logging
        ActiveSupport::LogSubscriber.colorize_logging
      end

      def colorize_logging=(val)
        ActiveSupport::LogSubscriber.colorize_logging = val
        generators.colorize_logging = val
      end

      def session_store(new_session_store = nil, **options)
        if new_session_store
          if new_session_store == :active_record_store
            begin
              ActionDispatch::Session::ActiveRecordStore
            rescue NameError
              raise "`ActiveRecord::SessionStore` is extracted out of Rails into a gem. " \
                "Please add `activerecord-session_store` to your Gemfile to use it."
            end
          end

          @session_store = new_session_store
          @session_options = options || {}
        else
          case @session_store
          when :disabled
            nil
          when :active_record_store
            ActionDispatch::Session::ActiveRecordStore
          when Symbol
            ActionDispatch::Session.const_get(@session_store.to_s.camelize)
          else
            @session_store
          end
        end
      end

      def session_store? #:nodoc:
        @session_store
      end

      def annotations
        SourceAnnotationExtractor::Annotation
      end

      class Custom #:nodoc:
        def initialize
          @configurations = Hash.new
        end

        def method_missing(method, *args)
          if method =~ /=$/
            @configurations[$`.to_sym] = args.first
          else
            @configurations.fetch(method) {
              @configurations[method] = ActiveSupport::OrderedOptions.new
            }
          end
        end

        def respond_to_missing?(symbol, *)
          true
        end
      end
    end
  end
end