module ShopifyApp::EnsureInstalled

def check_shop_domain
  redirect_to(ShopifyApp.configuration.login_url) unless current_shopify_domain
end

def check_shop_known
  @shop = installed_shop_session
  unless @shop
    if embedded_param?
      redirect_for_embedded
    else
      redirect_to(shop_login)
    end
  end
end

def current_shopify_domain
  if params[:shop].blank?
    ShopifyApp::Logger.info("Could not identify installed store from current_shopify_domain")
    return
  end
  @shopify_domain ||= ShopifyApp::Utils.sanitize_shop_domain(params[:shop])
  ShopifyApp::Logger.info("Installed store:  #{@shopify_domain} - deduced from Shopify Admin params")
  @shopify_domain
end

def installed_shop_session
  @installed_shop_session ||= SessionRepository.retrieve_shop_session_by_shopify_domain(current_shopify_domain)
end

def shop_login
  url = URI(ShopifyApp.configuration.login_url)
  url.query = URI.encode_www_form(
    shop: params[:shop],
    host: params[:host],
    return_to: request.fullpath,
  )
  url.to_s
end

def validate_non_embedded_session
  return if loaded_directly_from_admin?
  client = ShopifyAPI::Clients::Rest::Admin.new(session: installed_shop_session)
  client.get(path: "shop")
rescue ShopifyAPI::Errors::HttpResponseError => error
  ShopifyApp::Logger.info("Shop offline session no longer valid. Redirecting to OAuth install")
  redirect_to(shop_login) if error.code == 401
  raise error if error.code != 401
end