(in-package #:chatikbot)

;; Load config file
(alexandria:when-let (file (probe-file
                            (merge-pathnames "config.lisp"
                                             (asdf:component-pathname
                                              (asdf:find-system '#:chatikbot)))))
  (load file))


(defvar *telegram-last-update* nil "Telegram last update_id")

(defun process-updates ()
  (loop for update in (telegram-get-updates :offset (and *telegram-last-update*
                                                         (1+ *telegram-last-update*))
                                            :timeout 300)
     do (handle-message (aget "message" update))
     do (setf *telegram-last-update*
              (max (or *telegram-last-update* 0)
                   (aget "update_id" update)))))

(defvar *responses*
  '("И чё?" "Сам-то понял?" "Ну хуй знает" "Бля..." "В душе не ебу" "Мне похуй")
  "Unknown command respond strings")

(defun send-dont-understand (chat-id &optional text reply-id)
  (telegram-send-message chat-id
                         (if (and text (zerop (random 5)))
                             (format nil "Сам ~A"
                                     (replace-all text "@chatikbot" ""))
                             (nth (random (length *responses*)) *responses*))
                         :reply-to reply-id))

(defun handle-message (message)
  (let ((id (aget "message_id" message))
        (chat-id (aget "id" (aget "chat" message)))
        (text (aget "text" message)))
    (log:info "handle-message" message)
    (when text
      (if (equal #\/ (char text 0))
          (let ((cmd (intern (string-upcase
                              (subseq text 1 (position #\Space text)))
                             "KEYWORD"))
                (args (when (position #\Space text)
                        (split-sequence:split-sequence
                         #\Space (subseq text (1+ (position #\Space text)))))))
            (case cmd
              (:postakb (handle-cmd-post-akb chat-id id args))
              (:akb (handle-cmd-akb chat-id id args))
              (otherwise (send-dont-understand chat-id text))))
          (send-dont-understand chat-id text)))))

(defparameter +akb-vk-domain+ "baneks" "VK.com username of 'B-category anekdotes'")
(defvar *akb-send-to* nil "List of chat-id's to send AKBs to")

(defun handle-cmd-post-akb (chat-id message-id args)
  (log:info "handle-cmd-post-akb" chat-id message-id args)
  (let ((message "Хуярим аники"))
    (if (member chat-id *akb-send-to*)
        (setf message "Не хуярим больше аники"
              *akb-send-to* (set-difference *akb-send-to*
                                            (list chat-id)))
        (setf *akb-send-to* (cons chat-id *akb-send-to*)))
    (telegram-send-message chat-id message)))

(defvar *akb-max-count* 5 "Max number of tweets to return per run")
(defvar *akb-last-id* 0 "id of last AKB tweet")

(defun format-akb (post)
  (let* ((id (aget "id" post))
         (url (format nil "https://vk.com/~A?w=wall~A_~A"
                      +akb-vk-domain+ (aget "from_id" post) id)))
    (format nil "~A~%~A" (aget "text" post) url)))

(defun process-latest-akb ()
  (log:info "Getting latest AKBs")
  (dolist (post (reverse (aget "items" (vk-wall-get :domain +akb-vk-domain+
                                                    :count *akb-max-count*))))
    (let ((id (aget "id" post)))
      (when (> id *akb-last-id*)
        (send-akb (format-akb post))
        (setf *akb-last-id* id)))))

(defun send-akb (text)
  (log:info "send-akb: ~A" text)
  (dolist (chat-id *akb-send-to*)
    (handler-case
        (telegram-send-message chat-id text
                               :disable-web-preview 1)
      (error (e) (log:error e)))))

(defun handle-cmd-akb (chat-id message-id args)
  (log:info "handle-cmd-akb" chat-id message-id args)
  (let ((total-aneks
         (aget "count" (vk-wall-get :domain +akb-vk-domain+ :count 1 :offset 10000000))))
    (dolist (post (aget "items" (vk-wall-get :domain +akb-vk-domain+
                                             :count (or (ignore-errors (parse-integer (car args))) 1)
                                             :offset (random total-aneks))))
      (handler-case
          (telegram-send-message chat-id
                                 (format-akb post)
                                 :disable-web-preview 1)
        (error (e) (log:error e))))))


(defun start ()
  (mapc #'sb-ext:unschedule-timer (trivial-timers:list-all-timers))
  (clon:schedule-function
   (lambda () (process-latest-akb))
   (clon:make-scheduler
    (clon:make-typed-cron-schedule :minute '* :hour '*)
    :allow-now-p t)
   :thread t)
  (bordeaux-threads:make-thread
   (lambda ()
     (loop
        do (process-updates)))
   :name "process-updates"))