Trying this...

src/pages/api/invoices/[id]/items/add.ts

@@ -0,0 +1,88 @@
+import type { APIRoute } from "astro";
+import { db } from "../../../../../db";
+import { invoiceItems, invoices, members } from "../../../../../db/schema";
+import { eq, and } from "drizzle-orm";
+import { recalculateInvoiceTotals } from "../../../../../utils/invoice";
+
+export const POST: APIRoute = async ({
+  request,
+  redirect,
+  locals,
+  params,
+}) => {
+  const user = locals.user;
+  if (!user) {
+    return redirect("/login");
+  }
+
+  const { id: invoiceId } = params;
+  if (!invoiceId) {
+    return new Response("Invoice ID required", { status: 400 });
+  }
+
+  // Fetch invoice to verify existence and check status
+  const invoice = await db
+    .select()
+    .from(invoices)
+    .where(eq(invoices.id, invoiceId))
+    .get();
+
+  if (!invoice) {
+    return new Response("Invoice not found", { status: 404 });
+  }
+
+  // Verify membership
+  const membership = await db
+    .select()
+    .from(members)
+    .where(
+      and(
+        eq(members.userId, user.id),
+        eq(members.organizationId, invoice.organizationId)
+      )
+    )
+    .get();
+
+  if (!membership) {
+    return new Response("Unauthorized", { status: 401 });
+  }
+
+  // Only allow editing if draft
+  if (invoice.status !== "draft") {
+    return new Response("Cannot edit a finalized invoice", { status: 400 });
+  }
+
+  const formData = await request.formData();
+  const description = formData.get("description") as string;
+  const quantityStr = formData.get("quantity") as string;
+  const unitPriceStr = formData.get("unitPrice") as string;
+
+  if (!description || !quantityStr || !unitPriceStr) {
+    return new Response("Missing required fields", { status: 400 });
+  }
+
+  const quantity = parseFloat(quantityStr);
+  const unitPriceMajor = parseFloat(unitPriceStr);
+
+  // Convert to cents
+  const unitPrice = Math.round(unitPriceMajor * 100);
+  const amount = Math.round(quantity * unitPrice);
+
+  try {
+    await db.insert(invoiceItems).values({
+      invoiceId,
+      description,
+      quantity,
+      unitPrice,
+      amount,
+    });
+
+    // Update invoice totals
+    await recalculateInvoiceTotals(invoiceId);
+
+    return redirect(`/dashboard/invoices/${invoiceId}`);
+  } catch (error) {
+    console.error("Error adding invoice item:", error);
+    return new Response("Internal Server Error", { status: 500 });
+  }
+};