;; disfluid, implementation of the Solid specification
;; Copyright (C) 2021  Vivien Kraus

;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU Affero 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 Affero General Public License for more details.

;; You should have received a copy of the GNU Affero General Public License
;; along with this program.  If not, see <https://www.gnu.org/licenses/>.

(define-module (webid-oidc client gui authorization-prompt)
  #:use-module (gi)
  #:use-module (gi types)
  #:use-module (gi util)
  #:use-module (ice-9 match)
  #:use-module (ice-9 exceptions)
  #:use-module (ice-9 i18n)
  #:use-module (ice-9 receive)
  #:use-module (ice-9 optargs)
  #:use-module (ice-9 pretty-print)
  #:use-module (srfi srfi-9)
  #:use-module (srfi srfi-19)
  #:use-module (srfi srfi-26)
  #:use-module (webid-oidc errors)
  #:use-module ((webid-oidc stubs) #:prefix stubs:)
  #:use-module (webid-oidc web-i18n)
  #:use-module ((webid-oidc config) #:prefix config:)
  #:use-module (webid-oidc client client)
  #:use-module (webid-oidc client accounts)
  #:use-module (webid-oidc jwk)
  #:use-module (webid-oidc oidc-id-token)
  #:use-module (web uri)
  #:use-module (web response)
  #:use-module (rnrs bytevectors)
  #:use-module (oop goops)
  #:declarative? #t
  #:duplicates (merge-generics)
  #:export
  (
   make-authorization-prompt
   ))

(push-duplicate-handler! 'merge-generics)

;; This avoids a crash when compiling the module
(use-typelibs ("GdkPixbuf" "2.0")
              ("Gtk" "3.0"))

(define (make-authorization-prompt uri)
  ;; Return 3 values:
  ;; - the builder
  ;; - the whole widget
  ;; - a 2-value function (reason, continuation) to add a handler
  (let ((builder
         (builder:new-from-file
          (string-append config:uidir "/authorization-prompt.glade"))))
    (let ((whole-widget
           (builder:get-object builder "authorization_prompt"))
          (reason-label
           (builder:get-object builder "reason"))
          (link-button
           (builder:get-object builder "authorization_link"))
          (entry
           (builder:get-object builder "authorization_code_entry"))
          (ok
           (builder:get-object builder "ok_button"))
          (reasons '())
          (handlers '()))
      (let ((handle (lambda (reason continuation)
                      (label:set-text reason-label
                                      ((@ (ice-9 format) format) #f
                                       (G_ "Your authorization is required: ~a")
                                       (if (null? reasons)
                                           reason
                                           (format #f (G_ "~a, and ~a")
                                                   (string-join (reverse reasons) ", ")
                                                   reason))))
                      (set! reasons `(,reason ,@reasons))
                      (set! handlers `(,continuation ,@handlers)))))
        (link-button:set-uri link-button (uri->string uri))
        ((@ (gi) connect) entry activate
         (lambda _
           (button:clicked ok)))
        ((@ (gi) connect) ok clicked
         (lambda _
           (let ((code (entry:get-text entry)))
             ((@ (srfi srfi-1) for-each) (cute <> code) (reverse handlers)))))
        (values builder whole-widget handle)))))