;;; dependencies --- System library of FG42 -*- lexical-binding: t; -*-
;;
;; Copyright (c) 2010-2021 Sameer Rahmani & Contributors
;;
;; Author: Sameer Rahmani <lxsameer@gnu.org>
;; URL: https://gitlab.com/FG42/FG42
;; Version: 3.0.0
;;
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
;;
;;; Commentary:
;; `System' is just a state monad which holds the state of the editor.
;; Each system has to have a `start' function to start the setup process.
;;
;;; Code:
(require 'seq)
(require 'fg42/system/core)


(defun fg42/system-merge-keys (system cube-name keys)
  "Retun an updated SYSTEM with the given keys KEYS for CUBE-NAME.
It converts the `:keys' of the cube to the following format and adds
them to the system. (cube-nam mode (key f)s...)."
  (let ((keyset :good))
    (if keys
        ;; TODO: Validate the deps here
        (fg42/system-cons-to system
                             :keys
                             (car
                              (seq-reduce
                               (lambda (bindings keys)
                                 (let ((mode (car keys))
                                       (pair-list (plist-get (cdr keys) keyset)))
                                   (cons
                                    (list cube-name mode pair-list)
                                    bindings)))
                               keys
                               '())))

      system)))

;; (defun fg42/system-merge-keys (system cube-name keys)
;;   "Retun an updated SYSTEM with the given keys KEYS for CUBE-NAME.
;; It converts the `:keys' of the cube to the following format and adds
;; them to the system. (cube-nam mode (key f)s...)."
;;   (let ((keyset :good))
;;     (if keys
;;         ;; TODO: Validate the deps here
;;         (fg42/system-cons-to system
;;                              :keys
;;                              (car
;;                               (seq-reduce
;;                                (lambda (bindings keys)
;;                                  (let ((mode (car keys))
;;                                        (pair-list (plist-get (cdr keys) keyset)))
;;                                    (cons
;;                                     (list cube-name mode pair-list)
;;                                     bindings)))
;;                                keys
;;                                (assoc))))

;;       system)))


;; (defun fg42/system-setup-keys (system)
;;   "Setup the key binding through out the SYSTEM."
;;   (message "#$$$$$########### %s" (fg42/system-get system :keys))
;;   (let ((keyset :good))
;;     (mapcar
;;      (lambda (key-desc)
;;        (let ((cube-name (car key-desc))
;;              (map (cadr key-desc))
;;              (binding (caddr key-desc))
;;              (f       (cadddr key-desc)))
;;          (message "Set keybinding %s" key-desc)
;;          (if (eq keyset :good)
;;              (define-in-keymap map binding f)
;;            (define-evil-in-keymap map binding f))))
;;      (fg42/system-get system :keys)))
;;   system)

(defun fg42/system-setup-keys (system)
  "Setup the key binding through out the SYSTEM."
  (let ((keyset :good))
    (mapcar
     (lambda (key-desc)
       (let ((cube-name (car key-desc))
             (map (cadr key-desc))
             (binding (caddr key-desc))
             (f       (cadddr key-desc)))
         (message "Set keybinding %s" key-desc)
         (if (eq keyset :good)
             (define-in-keymap map binding f)
           (define-evil-in-keymap map binding f))))
     (fg42/system-get system :keys)))
  system)


(defmacro define-in-keymap (map binding f)
  "Set the given key BINDING in the given MAP to F."
  (if (eq map :global)
      `(global-set-key (kbd ,binding) ,f)
      `(define-key ,map (kbd ,binding) ,f)))


(defmacro define-evil-in-keymap (map binding f)
  "Set the given key BINDING in the given MAP to F (evil mode only)."
  (message "TBD")
  nil)


(provide 'fg42/system/keys)
;;; keys.el ends here