# frozen_string_literal: true

require 'active_support/inflector'

module InjectEnterpriseEditionModule
  def prepend_mod_with(constant_name, namespace: Object, with_descendants: false)
    each_extension_for(constant_name, namespace) do |constant|
      prepend_module(constant, with_descendants)
    end
  end

  def extend_mod_with(constant_name, namespace: Object)
    each_extension_for(constant_name, namespace) do |constant|
      extend constant
    end
  end

  def include_mod_with(constant_name, namespace: Object)
    each_extension_for(constant_name, namespace) do |constant|
      include constant
    end
  end

  def prepend_mod(with_descendants: false)
    prepend_mod_with(name, with_descendants: with_descendants) # rubocop: disable Cop/InjectEnterpriseEditionModule
  end

  def extend_mod
    extend_mod_with(name) # rubocop: disable Cop/InjectEnterpriseEditionModule
  end

  def include_mod
    include_mod_with(name) # rubocop: disable Cop/InjectEnterpriseEditionModule
  end

  def gitlab_extensions
    extensions = [self]
    each_extension_for(name, Object) { |c| extensions << c }
    extensions
  end

  private

  def prepend_module(mod, with_descendants)
    prepend(mod)

    if with_descendants
      descendants.each { |descendant| descendant.prepend(mod) }
    end
  end

  def each_extension_for(constant_name, namespace)
    GitlabEdition.extensions.each do |extension_name|
      extension_namespace =
        const_get_maybe_false(namespace, extension_name.upcase)

      extension_module =
        const_get_maybe_false(extension_namespace, constant_name)

      yield(extension_module) if extension_module
    end
  end

  def const_get_maybe_false(mod, name)
    mod && mod.const_defined?(name, false) && mod.const_get(name, false)
  end
end

Module.prepend(InjectEnterpriseEditionModule)