(in-package :cl-user)
(defpackage chatikbot.bot
  (:use :cl :chatikbot.utils :chatikbot.macros)
  (:import-from :chatikbot.db
                :set-setting)
  (:import-from :chatikbot.telegram
                :telegram-get-updates
                :bot-send-message)
  (:export :handle-update
           :*bot-user-id*
           :on-next-message))
(in-package :chatikbot.bot)

(defvar *bot-user-id* nil "Bot user_id")
(defvar *telegram-last-update* 0 "Telegram last update_id")

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

(defun handle-update (update)
  (log:info update)
  (let ((update-id (aget "update_id" update))
        (reply-to (agets update "message" "reply_to_message" "from" "id")))
    (if (> update-id *telegram-last-update*)
        (progn
          (if (and reply-to (not (equal reply-to *bot-user-id*)))
              (log:info "Reply not to bot")
              (loop for (key . value) in update
                 unless (equal "update_id" key)
                 do (run-hooks (keyify (format nil "update-~A" key)) value)))
          (setf *telegram-last-update* update-id))
        (log:warn "Out-of-order update" update-id))))

(defvar *start-message* "Hello" "Welcome message. Override it")
(def-message-cmd-handler handle-start (:start)
  (bot-send-message chat-id *start-message*))

(def-message-admin-cmd-handler handle-admin-settings (:settings)
  (bot-send-message chat-id
                    (format nil "~{~{~A~@[ (~A)~]: ~A~}~^~%~}"
                            (loop for symbol in *settings*
                               collect (list symbol (documentation symbol 'variable) (symbol-value symbol))))))

(def-message-admin-cmd-handler handle-admin-setsetting (:setsetting)
  (let* ((*package* (find-package :chatikbot))
         (var (read-from-string (car args)))
         (val (read-from-string (format nil "~{~A~^ ~}" (rest args)))))
    (bot-send-message chat-id (format nil "OK, ~A" (set-setting var val)))))

(defvar *chat-next-message-handlers* (make-hash-table) "Out-of-order chat message handler")
(defmacro on-next-message (chat-id &body body)
  `(setf (gethash ,chat-id *chat-next-message-handlers*)
         (lambda (message)
           (with-parsed-message message
             ,@body))))

(def-message-handler chat-next-message-handler (message 1000)
  (let ((handler (gethash chat-id *chat-next-message-handlers*)))
    (when handler
      (remhash chat-id *chat-next-message-handlers*)
      (handler-case (funcall handler message)
        (error (e)
          (log:error "~A" e)
          (bot-send-message chat-id
                            (format nil "Ошибочка вышла~@[: ~A~]"
                                    (when (member chat-id *admins*) e))))))))