# POS Loyalty Safe Coupon Patch

This custom Odoo module resolves critical Point of Sale (POS) Loyalty bugs in Odoo 19 that cause the POS UI to crash or render as a blank screen.

## Unsafe Coupon Access Fix
When an order is restored (e.g., during table switching in a restaurant) and references a coupon that is not yet fully loaded in the local client registry, Odoo leaves `coupon_id` as `undefined`. Accessing `.id` on this undefined object crashes the POS UI.

**How it works:**
* Dynamically patches `PosOrder.getLoyaltyPoints()`, `OrderPaymentValidation.validateOrder()`, and `PosStore.postProcessLoyalty()`.
* Temporarily mocks any missing `coupon_id` references with `{ id: 0 }`.
* Intercepts `this.data.call` during `postProcessLoyalty` to strip out dummy coupon records with ID `0` before communicating with the backend.

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## Invalid/Archived Rewards & program_id Fix
During startup or draft order restoration, if an existing order contains a reward line whose corresponding `reward_id` or `reward_id.program_id` is missing or archived (and therefore not loaded in the client registry), Odoo attempts to read `program_type` from it. This triggers a `TypeError: Cannot read properties of undefined (reading 'program_id')` or `(reading 'program_type')` and leaves a blank screen.

**How it works:**
* Dynamically patches `PosOrder._updateRewardLines()` and `PosStore.orderUpdateLoyaltyPrograms()`.
* Automatically filters and deletes reward lines that are missing a valid `reward_id` or its associated `program_id`.
* Restores non-corrupted order lines, safely healing the order state and allowing the POS session to load successfully.

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This ensures zero side effects, maximum stability, and clean compatibility with standard/custom addons.