# frozen_string_literal: true

module Qonfig
  # @api public
  # @since 0.2.0
  module Configurable
    class << self
      # @param base_klass [Class]
      # @return [void]
      #
      # @api private
      # @since 0.2.0
      def included(base_klass)
        base_klass.instance_variable_set(:@__qonfig_access_lock__, Mutex.new)
        base_klass.instance_variable_set(:@__qonfig_definition_lock__, Mutex.new)
        base_klass.instance_variable_set(:@__qonfig_config_klass__, Class.new(Qonfig::DataSet))
        base_klass.instance_variable_set(:@__qonfig_config__, nil)

        base_klass.extend(ClassMethods)
        base_klass.include(InstanceMethods)
        base_klass.singleton_class.prepend(ClassInheritance)

        super
      end
    end

    # @api private
    # @since 0.2.0
    module ClassInheritance
      # @param child_klass [Class]
      # @return [void]
      #
      # @api private
      # @since 0.2.0
      def inherited(child_klass)
        inherited_config_klass = Class.new(@__qonfig_config_klass__)

        child_klass.instance_variable_set(:@__qonfig_definition_lock__, Mutex.new)
        child_klass.instance_variable_set(:@__qonfig_access_lock__, Mutex.new)
        child_klass.instance_variable_set(:@__qonfig_config_klass__, inherited_config_klass)
        child_klass.instance_variable_set(:@__qonfig_config__, nil)

        super
      end
    end

    # @api private
    # @since 0.2.0
    module ClassMethods
      # @param block [Proc]
      # @return [void]
      #
      # @api public
      # @since 0.2.0
      def configuration(&block)
        @__qonfig_definition_lock__.synchronize do
          @__qonfig_config_klass__.instance_eval(&block) if block_given?
        end
      end

      # @param options_map [Hash]
      # @param block [Proc]
      # @return [void]
      #
      # @api public
      # @since 0.2.0
      def configure(options_map = {}, &block)
        @__qonfig_access_lock__.synchronize do
          config.configure(options_map, &block)
        end
      end

      # @return [Qonfig::DataSet]
      #
      # @api public
      # @since 0.2.0
      def config
        @__qonfig_definition_lock__.synchronize do
          @__qonfig_config__ ||= @__qonfig_config_klass__.new
        end
      end
    end

    # @api private
    # @since 0.2.0
    module InstanceMethods
      # @return [Qonfig::DataSet]
      #
      # @api public
      # @since 0.2.0
      def config
        self.class.instance_variable_get(:@__qonfig_definition_lock__).synchronize do
          @__qonfig_config__ ||= self.class.instance_variable_get(:@__qonfig_config_klass__).new
        end
      end

      # @return [Qonfig::DataSet]
      #
      # @api public
      # @since 0.6.0
      def shared_config
        self.class.config
      end

      # @param options_map [Hash]
      # @param block [Proc]
      # @return [void]
      #
      # @api public
      # @since 0.2.0
      def configure(options_map = {}, &block)
        self.class.instance_variable_get(:@__qonfig_access_lock__).synchronize do
          config.configure(options_map, &block)
        end
      end
    end
  end
end