From 822ef78e5880de93e2b82952a39630539609e306 Mon Sep 17 00:00:00 2001
From: Thomas Hallock <thomas@evolutioniq.com>
Date: Fri, 5 Dec 2025 10:03:40 -0600
Subject: [PATCH] fix(worksheets): sync preview and download problem generation
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Fix parameter mismatch in generatePreview.ts that caused preview to
show different problems than downloaded PDF:

- Addition: fix parameter order (was digitRange first, should be pAnyStart)
- Addition: add missing interpolate parameter
- Subtraction: add missing interpolate parameter
- Mixed: add missing interpolate parameter

Now preview and download use identical parameters, generating the same
problem set for the same seed.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
---
 apps/web/src/app/create/worksheets/generatePreview.ts | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/apps/web/src/app/create/worksheets/generatePreview.ts b/apps/web/src/app/create/worksheets/generatePreview.ts
index 8a1393a0..b02d72b3 100644
--- a/apps/web/src/app/create/worksheets/generatePreview.ts
+++ b/apps/web/src/app/create/worksheets/generatePreview.ts
@@ -10,8 +10,8 @@ import {
 } from './problemGenerator'
 import { getSkillById } from './skills'
 import { generateTypstSource } from './typstGenerator'
-import { validateWorksheetConfig } from './validation'
 import { validateProblemSpace } from './utils/validateProblemSpace'
+import { validateWorksheetConfig } from './validation'
 
 export interface PreviewResult {
   success: boolean
@@ -321,6 +321,7 @@ export function generateSinglePage(
         validatedConfig.digitRange,
         validatedConfig.pAnyStart,
         validatedConfig.pAllStart,
+        validatedConfig.interpolate,
         validatedConfig.seed
       )
     } else if (operator === 'subtraction') {
@@ -329,15 +330,18 @@ export function generateSinglePage(
         validatedConfig.digitRange,
         validatedConfig.pAnyStart,
         validatedConfig.pAllStart,
+        validatedConfig.interpolate,
         validatedConfig.seed
       )
     } else {
+      // Addition
       problems = generateProblems(
         validatedConfig.total,
-        validatedConfig.digitRange,
         validatedConfig.pAnyStart,
         validatedConfig.pAllStart,
-        validatedConfig.seed
+        validatedConfig.interpolate,
+        validatedConfig.seed,
+        validatedConfig.digitRange
       )
     }