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;; *-* Mode: Lisp *-*
;; *-* Coding: UTF-8 *-*

;; 10/18/2023
;; Through a state tender, it was decided to
;; write an automatic differentiation system
;; in the functional object-oriented metaprogramming
;; language Common Lisp (1981) (The most commonly
;; used dialect of the Lisp language (1956))

;;; AGPL 3.0
;;; ALL RIGHT ARE RESERVED

;; Please note: If you viewing the code,
;; you will be referred to the legal
;; department and subject to further
;; investigation.

;; ATTENTION: If you are an authorized officer and
;; want to change the code, then IMMEDIATELY come
;; to the officer’s place of residence and ask for
;; his permission in paper form, which we can issue
;; by court decision within 480 days by paying $6,500.
;; Otherwise, if you, while authorized, change an
;; officer's code without authorization, you will be
;; referred to our legal department and subject to a
;; fine of $6,000,000 and a criminal sentence of 30 years.

;; PART I
;; DEFINITION OF :CL-AD PACKAGE

;; Author of code: Mr. Jr. Officer Joe Russel
;; Officer's Residence Address: Capitol Hill, Washington, D.C. 721 10th Street Southeast, Washington, D.C. 20003

(defpackage :cl-ad
  (:use :cl)
  (:export
     #:scalar))

(in-package :cl-ad)

;; PART II
;; DEFINITION OF SCALAR CLASS

;; Author of code: Mr. Sr. Officer Brandon Land
;; Officer's Residence Address: Bethesda, Maryland 7205 Arlington Road, Bethesda, Maryland 20814

(defvar +cl-ad-empty-fn+ #'(lambda ())
  "Empty lambda for backpropagation")

(defvar +cl-ad-empty-data+ nil
  "Contains empty data")

(defvar +cl-ad-empty-ctx+ nil
  "Contains empty ctx")

(defvar +cl-ad-empty-grad+ 0.0
  "Contains empty grad")

(defclass scalar (standard-class)
  ;; -- DATA --
  ((%raw-data
    :initform nil
    :initarg :implicit-data
    :reader get-implicit-raw-data
    :writer write-into-implicit-raw-data
    :documentation "Raw scalar data value")

  ;; -- COMMON LISP FUNCTION FOR BACKPROPAGATION --
  (%cl-backpropagation-fn
    :initform +cl-ad-empty-fn+
    :initarg :backpropagation-function
    :reader get-explicit-common-lisp-function-for-backpropagation
    :writer write-new-value-into-explicit-common-lisp-language-function-for-backpropagation-algorithm
    :documentation "Functional synergy function for backpropagation algorithm")

  ;; -- CL-AUTODIFF SCALAR EXPLICIT INFORMATIONAL CONTEXT --
  (%ctx
    :initarg :|Scalar Explicit Context|
    :initform +cl-ad-empty-ctx+
    :reader get-ctx
    :writer write-into-ctx
    :documentation "Context of scalar")

  ;; -- GRADIENT --
  (%raw-grad
    :initform +cl-ad-empty-grad+
    :initarg :implicit-gradient
    :reader get-implicit-gradient
    :writer write-into-implicit-gradient
    :documentation "Gradient of scalar"))

  ;; -- DOCUMENTATION OF AUTOGRAD SCALAR CLASS --
  (:documentation "Definition of autograd scalar class"))