feat: Add action and dialog to copy/transfer modules between products

shop/lib/actions/products.ts

@@ -148,3 +148,61 @@ export async function deleteProduct(id: string) {
   revalidatePath('/admin/products')
   revalidatePath('/order')
 }
+
+export async function transferModules(
+  sourceProductId: string,
+  targetProductId: string,
+  mode: 'overwrite' | 'append'
+) {
+  const supabase = await createClient()
+
+  // 1. Fetch modules of source product
+  const { data: sourceModules, error: fetchError } = await supabase
+    .from('product_modules')
+    .select('*')
+    .eq('product_id', sourceProductId)
+
+  if (fetchError) throw fetchError
+  if (!sourceModules || sourceModules.length === 0) return
+
+  // 2. If overwrite, delete existing modules of target product
+  if (mode === 'overwrite') {
+    const { error: deleteError } = await supabase
+      .from('product_modules')
+      .delete()
+      .eq('product_id', targetProductId)
+    if (deleteError) throw deleteError
+  }
+
+  // 3. Map IDs to new UUIDs and fix requirements/exclusions
+  const idMap: Record<string, string> = {}
+  sourceModules.forEach(m => {
+    idMap[m.id] = randomUUID()
+  })
+
+  const newModules = sourceModules.map(m => {
+    const newId = idMap[m.id]
+    const requirements = (m.requirements || []).map((id: string) => idMap[id] || id)
+    const exclusions = (m.exclusions || []).map((id: string) => idMap[id] || id)
+    return {
+      id: newId,
+      product_id: targetProductId,
+      name: m.name,
+      description: m.description,
+      price: m.price,
+      requirements,
+      exclusions,
+      has_quantity: m.has_quantity ?? false,
+    }
+  })
+
+  // 4. Insert into DB
+  const { error: insertError } = await supabase
+    .from('product_modules')
+    .insert(newModules)
+
+  if (insertError) throw insertError
+
+  revalidatePath('/admin/products')
+  revalidatePath('/order')
+}