Feat: Entwurf bearbeiten (PATCH), erneut senden; SW by-v968

backend/routes/invoices.py

@@ -444,6 +444,58 @@ def get_invoice(invoice_id: int, admin=Depends(require_admin)):
     return result
 
 
+@router.patch("/{invoice_id}")
+def update_invoice(invoice_id: int, data: InvoiceCreate, admin=Depends(require_admin)):
+    with db() as conn:
+        row = conn.execute("SELECT * FROM invoices WHERE id=?", (invoice_id,)).fetchone()
+        if not row:
+            raise HTTPException(404, "Rechnung nicht gefunden.")
+        if row["status"] != "draft":
+            raise HTTPException(400, "Nur Entwürfe können bearbeitet werden.")
+        if not data.items:
+            raise HTTPException(400, "Mindestens eine Position erforderlich.")
+
+        KLEINUNTERNEHMER = os.getenv("KLEINUNTERNEHMER", "true").lower() == "true"
+        TAX_RATE = 0.0 if KLEINUNTERNEHMER else float(os.getenv("RECHNUNG_MWST", "19"))
+
+        amount_net = round(sum(i.quantity * i.unit_price for i in data.items), 2)
+        discount_pct = data.discount_pct or 0.0
+        discount_amount = round(amount_net * discount_pct / 100, 2)
+        amount_after_discount = round(amount_net - discount_amount, 2)
+        tax_amount = round(amount_after_discount * TAX_RATE / 100, 2)
+        amount_gross = round(amount_after_discount + tax_amount, 2)
+        description = data.items[0].description if len(data.items) == 1 else f"{len(data.items)} Positionen"
+
+        conn.execute("""
+            UPDATE invoices SET
+                recipient_name=?, recipient_email=?, recipient_address=?,
+                description=?, service_period=?,
+                amount_net=?, discount_pct=?, discount_amount=?,
+                amount_after_discount=?, tax_rate=?, tax_amount=?, amount_gross=?,
+                notes=?
+            WHERE id=?
+        """, (
+            data.recipient_name, data.recipient_email, data.recipient_address,
+            description, data.service_period,
+            amount_net, discount_pct, discount_amount,
+            amount_after_discount, TAX_RATE, tax_amount, amount_gross,
+            data.notes, invoice_id,
+        ))
+        conn.execute("DELETE FROM invoice_items WHERE invoice_id=?", (invoice_id,))
+        for item in data.items:
+            total = round(item.quantity * item.unit_price, 2)
+            conn.execute(
+                "INSERT INTO invoice_items (invoice_id, description, quantity, unit_price, total) VALUES (?,?,?,?,?)",
+                (invoice_id, item.description, item.quantity, item.unit_price, total)
+            )
+        row = conn.execute("SELECT * FROM invoices WHERE id=?", (invoice_id,)).fetchone()
+        items = _fetch_items(conn, invoice_id)
+
+    result = _row_to_dict(row)
+    result["items"] = items
+    return result
+
+
 @router.post("", status_code=201)
 def create_invoice(data: InvoiceCreate, admin=Depends(require_admin)):
     if not data.items:
@@ -501,6 +553,8 @@ async def send_invoice(invoice_id: int, admin=Depends(require_admin)):
             raise HTTPException(404, "Rechnung nicht gefunden.")
         if row["status"] == "cancelled":
             raise HTTPException(400, "Stornierte Rechnung kann nicht gesendet werden.")
+        if row["status"] == "paid":
+            raise HTTPException(400, "Bezahlte Rechnung kann nicht erneut gesendet werden.")
         items = _fetch_items(conn, invoice_id)
 
     invoice = _row_to_dict(row)