class LLMS_Controller_Admin_Quiz_Attempts {

	public function __construct() {

		add_action( 'admin_init', array( $this, 'maybe_run_actions' ) );
	}

	/**
	 * Run actions on form submission.
	 *
	 * @since 3.16.0
	 * @since 3.16.9 Unknown.
	 * @since 3.35.0 Sanitize `$_POST` data.
	 * @since 4.4.4 Made sure to exit after redirecting on attempt deletion.
	 * @since 5.9.0 Stop using deprecated `FILTER_SANITIZE_STRING`.
	 * @since 7.8.0 Added `llms_quiz_resumable_attempt_action` action and single resumable attempt delete.
	 *
	 * @return void
	 */
	public function maybe_run_actions() {

		if ( ! isset( $_REQUEST['_llms_quiz_attempt_nonce'] ) ) {
			return;
		}
		if ( ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_REQUEST['_llms_quiz_attempt_nonce'] ) ), 'llms_quiz_attempt_actions' ) ) {
			return;
		}

		if ( isset( $_POST['llms_quiz_attempt_action'] ) && isset( $_POST['llms_attempt_id'] ) ) {

			$action  = llms_filter_input( INPUT_POST, 'llms_quiz_attempt_action' );
			$attempt = new LLMS_Quiz_Attempt( absint( $_POST['llms_attempt_id'] ) );

			if ( ! current_user_can( 'edit_post', $attempt->get( 'quiz_id' ) ) ) {
				return;
			}

			if ( 'llms_attempt_delete' === $action ) {
				$url = add_query_arg(
					array(
						'page'    => 'llms-reporting',
						'tab'     => 'quizzes',
						'quiz_id' => $attempt->get( 'quiz_id' ),
						'stab'    => 'attempts',
					),
					admin_url( 'admin.php' )
				);
				$attempt->delete();
				wp_safe_redirect( $url );
				exit();
			} elseif ( 'llms_attempt_grade' === $action && ( isset( $_POST['remarks'] ) || isset( $_POST['points'] ) ) ) {
				$this->save_grade( $attempt );
			} elseif ( 'llms_disable_resume_attempt' === $action ) {
				$attempt->set( 'can_be_resumed', false );
				$attempt->save();
				$attempt->end();
			}
		}

		if ( isset( $_POST['llms_quiz_resumable_attempt_action'] ) ) {

			$action = llms_filter_input( INPUT_POST, 'llms_quiz_resumable_attempt_action' );

			if ( 'llms_clear_resumable_attempts' === $action ) {

				$quiz_id = llms_filter_input( INPUT_POST, 'llms_quiz_id' );

				if ( ! current_user_can( 'edit_post', $quiz_id ) ) {
					return;
				}

				$resumable_attempts = $this->get_resumable_attempts( $quiz_id );

				foreach ( $resumable_attempts as $attempt_id ) {
					$attempt = new LLMS_Quiz_Attempt( $attempt_id );
					$attempt->set( 'can_be_resumed', false );
					$attempt->save();

					$attempt->end();
				}
			}
		}
	}

	/**
	 * Get resumable attempts for a quiz.
	 *
	 * @since 7.8.0
	 *
	 * @param int $quiz_id Quiz ID.
	 */
	public function get_resumable_attempts( $quiz_id ) {

		// Query to get all resumable attempts.
		$query = new LLMS_Query_Quiz_Attempt(
			array(
				'quiz_id'        => $quiz_id,
				'can_be_resumed' => true,
				'status'         => 'incomplete',
			)
		);

		return wp_list_pluck( $query->get_results(), 'id' );
	}

	/**
	 * Saves changes to a quiz
	 *