feat: support user-related placeholders in submission templates and standardize display time to Asia/Bangkok timezone

app/actions/submissions.ts

@@ -113,8 +113,15 @@ export async function submitForm(
       }, {} as Record<string, string>);
 
       let message = templateToUse;
-      // Replace {1}, {2}, etc. with value
+      // Replace {1}, {2}, etc. with value, and new variables
       message = message.replace(/\{([^}]+)\}/g, (match: string, p1: string) => {
+        const key = p1.toLowerCase();
+        if (key === "username" || key === "displayname") {
+          return session.user?.name || "Unknown User";
+        }
+        if (key === "id") {
+          return discordId || "Unknown ID";
+        }
         return answersDict[p1] || "Not Provided";
       });
 

app/admin/form/[id]/extra/client.tsx

@@ -73,7 +73,7 @@ export default function FormExtraClient({ form }: FormExtraClientProps) {
               className="min-h-24"
             />
             <p className="text-sm text-muted-foreground">
-              Use <code>{`{1}`}</code>, <code>{`{2}`}</code> to insert answers according to question order. Example: <code>{`{1}`}</code> for the first question.
+              Use <code>{`{1}`}</code>, <code>{`{2}`}</code> to insert answers according to question order, and <code>{`{username}`}</code>, <code>{`{displayname}`}</code>, <code>{`{id}`}</code> for user info.
             </p>
           </div>
           <div className="space-y-2">
@@ -86,7 +86,7 @@ export default function FormExtraClient({ form }: FormExtraClientProps) {
               className="min-h-24"
             />
             <p className="text-sm text-muted-foreground">
-              Used when a user updates their existing submission. Use <code>{`{1}`}</code>, <code>{`{2}`}</code> to insert answers.
+              Used when a user updates their existing submission. Use <code>{`{1}`}</code>, <code>{`{2}`}</code> for answers, and <code>{`{username}`}</code>, <code>{`{displayname}`}</code>, <code>{`{id}`}</code> for user info.
             </p>
           </div>
           <div className="flex justify-end pt-2">

app/admin/form/[id]/result/[submissionId]/client.tsx

@@ -77,14 +77,14 @@ export default function SubmissionDetailClient({
           <div className="flex items-center gap-2 text-muted-foreground">
             <Calendar className="w-4 h-4 shrink-0" />
             <span className="font-semibold text-foreground">Initial Submission:</span>
-            <span>{new Date(submission.submittedAt).toLocaleString(undefined, { hour12: false })}</span>
+            <span>{new Date(submission.submittedAt).toLocaleString("en-US", { timeZone: "Asia/Bangkok", hour12: false })}</span>
           </div>
           {editHistory.length > 0 && (
             <div className="flex flex-col mt-2 pt-2 border-t">
               <span className="font-semibold text-foreground mb-1">Edit History:</span>
               <ul className="list-disc list-inside text-xs text-muted-foreground space-y-1">
                 {editHistory.map((edit, idx) => (
-                  <li key={idx}>Edited at {new Date(edit.editedAt).toLocaleString(undefined, { hour12: false })}</li>
+                  <li key={idx}>Edited at {new Date(edit.editedAt).toLocaleString("en-US", { timeZone: "Asia/Bangkok", hour12: false })}</li>
                 ))}
               </ul>
             </div>
@@ -197,7 +197,7 @@ export default function SubmissionDetailClient({
                           >
                             <div className="flex items-center gap-1 text-xs text-muted-foreground">
                               <Clock className="w-3 h-3 shrink-0" />
-                              <span>{new Date(entry.editedAt).toLocaleString()}</span>
+                              <span>{new Date(entry.editedAt).toLocaleString("en-US", { timeZone: "Asia/Bangkok", hour12: false })}</span>
                             </div>
                             <span className="text-sm text-foreground/80 whitespace-pre-wrap leading-relaxed">
                               {entry.answer || <span className="italic text-muted-foreground">No response</span>}

app/admin/form/[id]/result/page.tsx

@@ -81,7 +81,7 @@ export default async function ResultsListPage(
                       </TableCell>
                       <TableCell className="p-0 text-muted-foreground">
                         <Link href={`/admin/form/${params.id}/result/${sub.id}`} className="flex items-center p-4 w-full h-full">
-                          {new Date(sub.submittedAt).toLocaleString()}
+                          {new Date(sub.submittedAt).toLocaleString("en-US", { timeZone: "Asia/Bangkok", hour12: false })}
                         </Link>
                       </TableCell>
                       <TableCell className="text-right p-4">