;;; jabber-register.el --- registration according to JEP-0077  -*- lexical-binding: t; -*-

;; Copyright (C) 2003, 2004, 2007 - Magnus Henoch - mange@freemail.hu
;; Copyright (C) 2002, 2003, 2004 - tom berger - object@intelectronica.net
;; Copyright (C) 2026  Thanos Apollo

;; Maintainer: Thanos Apollo <public@thanosapollo.org>

;; This file is a part of jabber.el.

;; 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 2 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, write to the Free Software
;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

;;; Commentary:
;;

;;; Code:

(require 'jabber-core)
(require 'jabber-iq)
(require 'jabber-lifecycle)
(require 'jabber-widget)
(require 'jabber-xdata)

;; Global reference declarations

(declare-function jabber-submit-search "jabber-search.el" (&rest _ignore))
(defvar jabber-buffer-connection)       ; jabber-chatbuffer.el
(defvar jabber-silent-mode)             ; jabber.el
(defvar jabber-xdata-xmlns)            ; jabber-xml.el
(defvar jabber-search-xmlns)           ; jabber-search.el

;; Namespace constants

(defconst jabber-register-xmlns "jabber:iq:register"
  "XEP-0077 In-Band Registration namespace.")

;;

(defun jabber-get-register (jc to)
  "Send IQ get request to TO in namespace \"jabber:iq:register\".

JC is the Jabber connection."
  (interactive (list (jabber-read-account)
		     (jabber-read-jid-completing "Register with: ")))
  (jabber-send-iq jc to
		  "get"
		  `(query ((xmlns . ,jabber-register-xmlns)))
		  #'jabber-process-data #'jabber-process-register-or-search
		  #'jabber-report-success "Registration"))

(defun jabber-register--start-account-registration (jc)
  "Start in-band account registration on JC."
  (jabber-get-register jc nil))

(add-hook 'jabber-lifecycle-registration-functions
          #'jabber-register--start-account-registration)

(defun jabber-process-register-or-search (jc xml-data)
  "Display results from jabber:iq:{register,search} query as a form.

JC is the Jabber connection.
XML-DATA is the parsed tree data from the stream (stanzas)
obtained from `xml-parse-region'."

  (let ((query (jabber-iq-query xml-data))
	(have-xdata nil)
	(type (cond
	       ((string= (jabber-iq-xmlns xml-data) jabber-register-xmlns)
		'register)
	       ((string= (jabber-iq-xmlns xml-data) jabber-search-xmlns)
		'search)
	       (t
		(error "Namespace %s not handled by jabber-process-register-or-search" (jabber-iq-xmlns xml-data)))))
	(register-account
	 (plist-get (fsm-get-state-data jc) :registerp))
	(username
	 (plist-get (fsm-get-state-data jc) :username))
	(server
	 (plist-get (fsm-get-state-data jc) :server)))

    (cond
     ((eq type 'register)
      ;; If there is no `from' attribute, we are registering with the server
      (jabber-widget-init-buffer (or (jabber-xml-get-attribute xml-data 'from)
				     server)))

     ((eq type 'search)
      ;; no such thing here
      (jabber-widget-init-buffer (jabber-xml-get-attribute xml-data 'from))))

    (setq jabber-buffer-connection jc)

    (widget-insert (if (eq type 'register) "Register with " "Search ") jabber-widget-submit-to "\n\n")

    (dolist (x (jabber-xml-get-children query 'x))
      (when (string= (jabber-xml-get-attribute x 'xmlns) jabber-xdata-xmlns)
	(setq have-xdata t)
	;; If the registration form obeys XEP-0068, we know
	;; for sure how to put a default username in it.
	(jabber-widget-render-xdata-form x
					 (if (and register-account
						  (string= (jabber-xdata-form-type x) jabber-register-xmlns))
					     (list (cons "username" username))
					   nil))))
    (if (not have-xdata)
	(jabber-widget-render-register-form query
					    (when register-account
					      username)))

    (widget-create 'push-button :notify (if (eq type 'register)
					    #'jabber-submit-register
					  #'jabber-submit-search) "Submit")
    (when (eq type 'register)
      (widget-insert "\t")
      (widget-create 'push-button :notify #'jabber-remove-register "Cancel registration"))
    (widget-insert "\n")
    (widget-setup)
    (widget-minor-mode 1)))

(defun jabber-submit-register (&rest _ignore)
  "Submit registration input.  See `jabber-process-register-or-search'."
  (let* ((registerp (plist-get (fsm-get-state-data jabber-buffer-connection) :registerp))
	 (handler (if registerp
		      #'jabber-process-register-secondtime
		    #'jabber-report-success))
	 (text (concat "Registration with " jabber-widget-submit-to)))
    (jabber-send-iq jabber-buffer-connection jabber-widget-submit-to
		    "set"

		    (cond
		     ((eq jabber-widget-form-type 'register)
		      `(query ((xmlns . ,jabber-register-xmlns))
			      ,@(jabber-widget-parse-register-form)))
		     ((eq jabber-widget-form-type 'xdata)
		      `(query ((xmlns . ,jabber-register-xmlns))
			      ,(jabber-widget-parse-xdata-form)))
		     (t
		      (error "Unknown form type: %s" jabber-widget-form-type)))
		    handler (if registerp 'success text)
		    handler (if registerp 'failure text)))

  (message "Registration sent"))

(defun jabber-process-register-secondtime (jc xml-data closure-data)
  "Receive registration success or failure.
CLOSURE-DATA is either `success' or `error'.

JC is the Jabber connection.
XML-DATA is the parsed tree data from the stream (stanzas)
obtained from `xml-parse-region'."
  (cond
   ((eq closure-data 'success)
    (message "Registration successful.  You may now connect to the server."))
   (t
    (jabber-report-success jc xml-data "Account registration")))
  (sit-for 3)
  (jabber-disconnect-one jc))

(defun jabber-remove-register (&rest _ignore)
  "Cancel registration.  See `jabber-process-register-or-search'."

  (if (or jabber-silent-mode (yes-or-no-p (concat "Are you sure that you want to cancel your registration to " jabber-widget-submit-to "? ")))
      (jabber-send-iq jabber-buffer-connection jabber-widget-submit-to
		      "set"
		      `(query ((xmlns . ,jabber-register-xmlns))
			      (remove))
		      #'jabber-report-success "Unregistration"
		      #'jabber-report-success "Unregistration")))

(provide 'jabber-register)

;;; jabber-register.el ends here
