MakeYourLaws/MakeYourLaws

class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
  User.omniauth_providers.each do |kind|
    define_method kind do
      # unless User.omniauth_providers.include? kind
      #   flash[:error] = "#{kind} is not a supported identification method."
      #   redirect_to login_path and return
      # end

      auth = request.env['omniauth.auth'] # 1. Get the Omniauth response

      id = Identity.by_omniauth(auth)

      unless id # 2. Update or create an Identity to go with it
        flash[:error] = I18n.t 'devise.omniauth_callbacks.failure', kind: kind # TODO: add reason
        redirect_to login_path && return
      end

      if user_signed_in? # 3a. Add this identity to the logged in user
        @user = current_user
        @user.identities << id
        if @user.save
          flash[:notice] = "#{OmniAuth::Utils.camelize kind} identity successfully added!"
        else
          flash[:error] = "Error adding your #{OmniAuth::Utils.camelize kind} identity. \
Please try again."
        end
        redirect_to edit_user_registration_path
      elsif id.user # 3b. Log them in if they're already a user
        @user = id.user
        flash[:notice] = I18n.t 'devise.omniauth_callbacks.success', kind: kind

        # or back to request.env["omniauth.origin"]
        sign_in_and_redirect @user, event: :authentication
      else
        session['devise.identity'] = id.id # 3c. Validate info & create user account
        redirect_to signup_from_id_path
      end
    end
  end
end