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+;; SPDX-License-Identifier: EUPL-1.2
+;; SPDX-FileCopyrightText: 2025 Uko Kokņevičs <perkontevs@gmail.com>
+(defpackage :ukkoclot/bot/impl
+  (:use :c2cl :iterate :ukkoclot/config :ukkoclot/log)
+  (:import-from :anaphora :aand :acond :it)
+  (:import-from :dex)
+  (:import-from :ukkoclot/strings :lisp->snake-case)
+  (:local-nicknames
+   (:jzon :com.inuoe.jzon))
+  (:export
+   :arg-encode :bot :bot-p :make-bot :do-call
+
+   :bot-config :bot-db :bot-base-uri :bot-power-on :bot-username% :bot-id%))
+(in-package :ukkoclot/bot/impl)
+
+(defgeneric will-arg-encode (object)
+  (:documentation "Whether the OBJECT has any transformation done to it by arg-encode")
+  (:method (obj)
+    nil)
+  (:method ((obj cons))
+    (or (will-arg-encode (car obj))
+        (will-arg-encode (cdr obj)))))
+
+(defgeneric arg-encode (object)
+  (:documentation "Encode the OBJECT to a form that our HTTP code is happy about.")
+  (:method (obj)
+    obj)
+  (:method ((obj cons))
+    (if (not (will-arg-encode obj))
+        obj
+        (cons (arg-encode (car obj))
+              (arg-encode (cdr obj))))))
+
+(defgeneric fixup-arg (value)
+  (:documentation "Make sure Telegram & QURI & whatever like the arg")
+  (:method (value)
+    (error "Unsupported argument type ~S (~S)" (class-name (class-of value)) value))
+  (:method ((value null))
+    value)
+  (:method ((value number))
+    value)
+  (:method ((value string))
+    value)
+  (:method ((value hash-table))
+    (jzon:stringify value)))
+
+(defstruct (bot (:constructor make-bot%))
+  (config (error "No value given for config") :read-only t)
+  (db (error "No value given for DB") :read-only t)
+  (base-uri (error "No value given for base-uri") :read-only t)
+  (power-on t :type boolean)
+  (username% nil :type (or string null))
+  (id% nil :type (or integer null)))
+
+(defun make-bot (config db)
+  (let ((base-uri (concatenate 'string
+                               "https://api.telegram.org/bot"
+                               (config-bot-token config) "/")))
+    (make-bot% :config config :db db :base-uri base-uri)))
+
+(defun args-plist->alist (args-plist)
+  (iter (for (old-key value) on args-plist by #'cddr)
+    (collect
+        (let ((new-key (string-downcase (lisp->snake-case (symbol-name old-key)))))
+          (cons new-key value)))))
+
+(defun fixup-args (args-alist)
+  (iter (for (name . value) in args-alist)
+    (collecting (cons name (fixup-arg (arg-encode value))))))
+
+(defun req (uri method content)
+  ;; We deal with this manually
+  (handler-bind ((dex:http-request-too-many-requests #'dex:ignore-and-continue))
+    (dex:request uri :method method :content content)))
+
+(defun do-call% (bot method uri mapfn args-encoded)
+  (let ((body (req uri method args-encoded)))
+    (let ((hash (jzon:parse body)))
+      (acond
+        ((gethash "ok" hash) (funcall mapfn (gethash "result" hash)))
+        ((aand (gethash "parameters" hash)
+               (gethash "retry_after" it))
+         (log-info "Should sleep for ~A seconds" it)
+         (sleep it)
+         (log-info "Good morning!")
+         (do-call% bot method uri mapfn args-encoded))
+        (t (error "TG error ~A: ~A ~:A"
+                  (gethash "error_code" hash)
+                  (gethash "description" hash)
+                  (gethash "parameters" hash)))))))
+
+(defun do-call (bot method path mapfn args-plist)
+  (let ((uri (concatenate 'string (bot-base-uri bot) path))
+        (args-encoded (fixup-args (args-plist->alist args-plist))))
+    (log-debug "~A .../~A ~S" method path args-encoded)
+    (do-call% bot method uri mapfn args-encoded)))