From fda05f8ce638987d332c8aff4043afa74e52523f Mon Sep 17 00:00:00 2001
From: Colin Okay <colin@cicadas.surf>
Date: Thu, 27 Oct 2022 10:40:58 -0500
Subject: Add: invite code redeeming logic

---
 model.lisp       | 36 ++++++++++++++++++++++++++++++------
 new-account.lisp |  5 +----
 2 files changed, 31 insertions(+), 10 deletions(-)

diff --git a/model.lisp b/model.lisp
index b88bd91..cc87453 100644
--- a/model.lisp
+++ b/model.lisp
@@ -3,17 +3,21 @@
 (in-package :vampire)
 
 (defclass/bknr keyed ()
-  ((key
-    :r :std (nuid)
-       :index-type string-unique-index
-       :index-reader object-with-key)))
+  ((key :r :std (nuid)
+           :index-type string-unique-index
+           :index-reader object-with-key)))
 
 (defclass/bknr user (keyed)
   ((name :with
          :index-type string-unique-index
          :index-reader user-with-name)
    (playlists :with :std (list))
-   (pwsalt pwhash :with)))
+   (pwsalt :with :std (nuid))
+   (pwhash :with)))
+
+(defclass/bknr invite (keyed)
+  ((maker :r :std nil)
+   (uses-remaining :std nil)))
 
 (defclass/bknr playlist (keyed)
   ((title :with :std (default-name "playlist"))
@@ -25,7 +29,6 @@
 (defmethod initialize-instance :after ((pl playlist) &key)
   (pushnew pl (user-playlists (playlist-user pl)) :test #'eq))
 
-
 (defclass/bknr track (keyed)
   ((source file title artist album thumb-url duration codec :with)
    (playlists :with :std (list) :doc "A list of playlists in which this track appears")))
@@ -33,6 +36,15 @@
 
 ;;; MODEL OPERATIONS
 
+(defun invite-by-code (code)
+  "Returns NIL if CODE is an invalid invite code. Returns the INVITE
+   instance otherwise"
+  (when-let (obj (object-with-key code))
+    (and (typep obj 'invite)
+         (or (null (uses-remaining obj))
+             (plusp (uses-remaining obj)))
+         obj)))
+
 (defun user-with-key (key)
   (when-let (obj (object-with-key key))
     (when (typep obj 'user)
@@ -70,6 +82,18 @@
   (with-transaction ()
     (make-instance 'user :name name)))
 
+(defun use-invite-with-code (code username pw)
+  (with-transaction ()
+    (when-let (invite (invite-by-code code))
+      (when (uses-remaining invite)
+        (decf (uses-remaining invite))
+        (unless (plusp (uses-remaining invite))
+          (bknr.datastore:delete-object invite))
+        (let ((user (make-instance 'user :name username)))
+          (setf (user-pwhash user)
+                (hash-string pw (user-pwsalt user)))
+          user)))))
+
 (defun append-track (pl tr)
   (with-transaction ()
     (add-track tr pl)))
diff --git a/new-account.lisp b/new-account.lisp
index 10311af..93cf122 100644
--- a/new-account.lisp
+++ b/new-account.lisp
@@ -2,9 +2,6 @@
 
 (in-package :vampire)
 
-(defun valid-invite-code-p (arg) arg)
-(defun use-invite-with-code (code username pw))
-
 (defun new-accout-page (body)
   (with-clog-create body
       (div ()
@@ -32,7 +29,7 @@
      invite
      (thunk*
          (setf (inner-html invite-status)
-               (if (valid-invite-code-p (value invite))
+               (if (invite-by-code (value invite))
                    "✔"
                    "Bad Invite Code"))))
     (set-on-blur
-- 
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