# frozen_string_literal: true

class Admin::SessionsController < ApplicationController
  include AuthenticatesWithTwoFactorForAdminMode
  include InternalRedirect
  include RendersLdapServers

  before_action :user_is_admin!

  feature_category :system_access

  def new
    if current_user_mode.admin_mode?
      redirect_to redirect_path, notice: _('Admin mode is already active.')
    else
      current_user_mode.request_admin_mode! unless current_user_mode.admin_mode_requested?
      store_location_for(:redirect, redirect_path)
    end
  end

  def create
    if two_factor_enabled_for_user?
      admin_mode_authenticate_with_two_factor
    elsif current_user_mode.enable_admin_mode!(password: user_params[:password])
      redirect_to redirect_path, notice: _('Admin mode is active.')
    else
      flash.now[:alert] = _('Invalid login or password')
      render :new
    end
  rescue Gitlab::Auth::CurrentUserMode::NotRequestedError
    redirect_to new_admin_session_path,
      alert: _('Re-authentication period expired or never requested. Please try again')
  end

  def destroy
    current_user_mode.disable_admin_mode!

    if Feature.enabled?(:omniauth_step_up_auth_for_admin_mode, current_user)
      ::Gitlab::Auth::Oidc::StepUpAuthentication.disable_step_up_authentication!(session: session, scope: :admin_mode)
    end

    redirect_to root_path, status: :found, notice: _('Admin mode is inactive.')
  end

  private

  def user_is_admin!
    render_404 unless current_user&.can_access_admin_area?
  end

  def two_factor_enabled_for_user?
    current_user&.two_factor_enabled?
  end

  def redirect_path
    redirect_to_path = safe_redirect_path(stored_location_for(:redirect)) || safe_redirect_path_for_url(request.referer)

    if redirect_to_path &&
        excluded_redirect_paths.none? { |excluded| redirect_to_path.include?(excluded) }
      redirect_to_path
    else
      admin_root_path
    end
  end

  def excluded_redirect_paths
    [new_admin_session_path, admin_session_path]
  end

  def user_params
    params.fetch(:user, {}).permit(:password, :otp_attempt, :device_response) # rubocop:disable Rails/StrongParams -- fetch is safely followed by permit
  end

  def valid_otp_attempt?(user)
    otp_validation_result =
      ::Users::ValidateManualOtpService.new(user).execute(user_params[:otp_attempt])
    valid_otp_attempt = otp_validation_result[:status] == :success

    return valid_otp_attempt if Gitlab::Database.read_only?

    valid_otp_attempt || user.invalidate_otp_backup_code!(user_params[:otp_attempt])
  end
end
