Added discounts to invoices

src/db/schema.ts

@@ -277,6 +277,9 @@ export const invoices = sqliteTable(
     notes: text("notes"),
     currency: text("currency").default("USD").notNull(),
     subtotal: integer("subtotal").notNull().default(0), // in cents
+    discountValue: real("discount_value").default(0),
+    discountType: text("discount_type").default("percentage"), // 'percentage' or 'fixed'
+    discountAmount: integer("discount_amount").default(0), // in cents
     taxRate: real("tax_rate").default(0), // percentage
     taxAmount: integer("tax_amount").notNull().default(0), // in cents
     total: integer("total").notNull().default(0), // in cents

src/pages/api/invoices/[id]/update.ts

@@ -4,12 +4,7 @@ import { 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,
-}) => {
+export const POST: APIRoute = async ({ request, redirect, locals, params }) => {
   const user = locals.user;
   if (!user) {
     return redirect("/login");
@@ -38,8 +33,8 @@ export const POST: APIRoute = async ({
     .where(
       and(
         eq(members.userId, user.id),
-        eq(members.organizationId, invoice.organizationId)
-      )
+        eq(members.organizationId, invoice.organizationId),
+      ),
     )
     .get();
 
@@ -53,6 +48,8 @@ export const POST: APIRoute = async ({
   const issueDateStr = formData.get("issueDate") as string;
   const dueDateStr = formData.get("dueDate") as string;
   const taxRateStr = formData.get("taxRate") as string;
+  const discountType = (formData.get("discountType") as string) || "percentage";
+  const discountValueStr = formData.get("discountValue") as string;
   const notes = formData.get("notes") as string;
 
   if (!number || !currency || !issueDateStr || !dueDateStr) {
@@ -64,6 +61,11 @@ export const POST: APIRoute = async ({
     const dueDate = new Date(dueDateStr);
     const taxRate = taxRateStr ? parseFloat(taxRateStr) : 0;
 
+    let discountValue = discountValueStr ? parseFloat(discountValueStr) : 0;
+    if (discountType === "fixed") {
+      discountValue = Math.round(discountValue * 100);
+    }
+
     await db
       .update(invoices)
       .set({
@@ -72,6 +74,8 @@ export const POST: APIRoute = async ({
         issueDate,
         dueDate,
         taxRate,
+        discountType: discountType as "percentage" | "fixed",
+        discountValue,
         notes: notes || null,
       })
       .where(eq(invoices.id, invoiceId));

src/pages/dashboard/invoices/[id].astro

@@ -294,6 +294,15 @@ const isDraft = invoice.status === 'draft';
               <span class="text-base-content/60">Subtotal</span>
               <span class="font-medium">{formatCurrency(invoice.subtotal)}</span>
             </div>
+            {(invoice.discountAmount > 0) && (
+              <div class="flex justify-between text-sm">
+                <span class="text-base-content/60">
+                  Discount
+                  {invoice.discountType === 'percentage' && ` (${invoice.discountValue}%)`}
+                </span>
+                <span class="font-medium text-success">-{formatCurrency(invoice.discountAmount)}</span>
+              </div>
+            )}
             {((invoice.taxRate ?? 0) > 0 || isDraft) && (
               <div class="flex justify-between text-sm items-center group">
                 <span class="text-base-content/60 flex items-center gap-2">

src/pages/dashboard/invoices/[id]/edit.astro

@@ -38,6 +38,10 @@ if (!membership) {
 // Format dates for input[type="date"]
 const issueDateStr = invoice.issueDate.toISOString().split('T')[0];
 const dueDateStr = invoice.dueDate.toISOString().split('T')[0];
+
+const discountValueDisplay = invoice.discountType === 'fixed'
+  ? (invoice.discountValue || 0) / 100
+  : (invoice.discountValue || 0);
 ---
 
 <DashboardLayout title={`Edit ${invoice.number} - Chronus`}>
@@ -112,6 +116,27 @@ const dueDateStr = invoice.dueDate.toISOString().split('T')[0];
             />
           </div>
 
+          <!-- Discount -->
+          <div class="form-control">
+            <label class="label">
+              <span class="label-text font-semibold">Discount</span>
+            </label>
+            <div class="join w-full">
+              <select name="discountType" class="select select-bordered join-item">
+                <option value="percentage" selected={!invoice.discountType || invoice.discountType === 'percentage'}>%</option>
+                <option value="fixed" selected={invoice.discountType === 'fixed'}>Fixed</option>
+              </select>
+              <input
+                type="number"
+                name="discountValue"
+                step="0.01"
+                min="0"
+                class="input input-bordered join-item w-full"
+                value={discountValueDisplay}
+              />
+            </div>
+          </div>
+
            <!-- Tax Rate -->
           <div class="form-control">
             <label class="label">

src/pdf/generateInvoicePDF.ts

@@ -40,6 +40,9 @@ interface Invoice {
   dueDate: Date;
   currency: string;
   subtotal: number;
+  discountValue: number | null;
+  discountType: string | null;
+  discountAmount: number | null;
   taxRate: number | null;
   taxAmount: number;
   total: number;
@@ -503,6 +506,24 @@ export function createInvoiceDocument(props: InvoiceDocumentProps) {
                   formatCurrency(invoice.subtotal),
                 ),
               ]),
+              (invoice.discountAmount ?? 0) > 0
+                ? h(View, { style: styles.totalRow }, [
+                    h(
+                      Text,
+                      { style: styles.totalLabel },
+                      `Discount${
+                        invoice.discountType === "percentage"
+                          ? ` (${invoice.discountValue}%)`
+                          : ""
+                      }`,
+                    ),
+                    h(
+                      Text,
+                      { style: styles.totalValue },
+                      `-${formatCurrency(invoice.discountAmount ?? 0)}`,
+                    ),
+                  ])
+                : null,
               (invoice.taxRate ?? 0) > 0
                 ? h(View, { style: styles.totalRow }, [
                     h(

src/utils/invoice.ts

@@ -27,16 +27,34 @@ export async function recalculateInvoiceTotals(invoiceId: string) {
   // Note: amounts are in cents
   const subtotal = items.reduce((acc, item) => acc + item.amount, 0);
 
-  const taxRate = invoice.taxRate || 0;
-  const taxAmount = Math.round(subtotal * (taxRate / 100));
+  // Calculate discount
+  const discountType = invoice.discountType || "percentage";
+  const discountValue = invoice.discountValue || 0;
+  let discountAmount = 0;
 
-  const total = subtotal + taxAmount;
+  if (discountType === "percentage") {
+    discountAmount = Math.round(subtotal * (discountValue / 100));
+  } else {
+    // Fixed amount is assumed to be in cents
+    discountAmount = Math.round(discountValue);
+  }
+
+  // Ensure discount doesn't exceed subtotal
+  discountAmount = Math.max(0, Math.min(discountAmount, subtotal));
+
+  const taxableAmount = subtotal - discountAmount;
+
+  const taxRate = invoice.taxRate || 0;
+  const taxAmount = Math.round(taxableAmount * (taxRate / 100));
+
+  const total = taxableAmount + taxAmount;
 
   // Update invoice
   await db
     .update(invoices)
     .set({
       subtotal,
+      discountAmount,
       taxAmount,
       total,
     })