From 2b58ecd82eaef0fc2c23b7454ba5f3602b0c3ce3 Mon Sep 17 00:00:00 2001
From: Fabien O'Carroll <fabien@allou.is>
Date: Thu, 7 Oct 2021 17:33:26 +0200
Subject: [PATCH] Added support for creating fixed offers with currency

refs https://github.com/TryGhost/Team/issues/1083

We now allow creating offers for a fixed amount, rather than a
percentage. These require a currency to be passed as a fixed amount is
meaningless without one.
---
 ghost/offers/lib/OfferRepository.js            |  6 +++++-
 ghost/offers/lib/domain/models/Offer.js        | 14 ++++++++------
 .../offers/lib/domain/models/OfferCurrency.js  | 18 ++++++++++++++++++
 3 files changed, 31 insertions(+), 7 deletions(-)
 create mode 100644 ghost/offers/lib/domain/models/OfferCurrency.js

diff --git a/ghost/offers/lib/OfferRepository.js b/ghost/offers/lib/OfferRepository.js
index ccdcf3f02e..ef1d4583a7 100644
--- a/ghost/offers/lib/OfferRepository.js
+++ b/ghost/offers/lib/OfferRepository.js
@@ -122,7 +122,8 @@ class OfferRepository {
             discount_amount: offer.amount.value,
             interval: offer.cadence.value,
             product_id: offer.tier.id,
-            duration: offer.duration.value
+            duration: offer.duration.value,
+            currency: offer.currency.value
         });
 
         if (offer.codeChanged || offer.isNew) {
@@ -143,6 +144,9 @@ class OfferRepository {
 
             if (offer.type.value === 'percent') {
                 coupon.percent_off = offer.amount.value;
+            } else {
+                coupon.amount_off = offer.amount.value;
+                coupon.currency = offer.currency.value;
             }
 
             const couponData = await this.stripeAPIService.createCoupon(coupon);
diff --git a/ghost/offers/lib/domain/models/Offer.js b/ghost/offers/lib/domain/models/Offer.js
index c1fd30c870..8c956bcd1e 100644
--- a/ghost/offers/lib/domain/models/Offer.js
+++ b/ghost/offers/lib/domain/models/Offer.js
@@ -9,6 +9,7 @@ const OfferDescription = require('./OfferDescription');
 const OfferCadence = require('./OfferCadence');
 const OfferType = require('./OfferType');
 const OfferDuration = require('./OfferDuration');
+const OfferCurrency = require('./OfferCurrency');
 
 /**
  * @typedef {object} OfferProps
@@ -21,7 +22,7 @@ const OfferDuration = require('./OfferDuration');
  * @prop {OfferType} type
  * @prop {OfferAmount} amount
  * @prop {OfferDuration} duration
- * @prop {string} currency
+ * @prop {OfferCurrency} currency
  * @prop {string} [stripe_coupon_id]
  * @prop {OfferTier} tier
  */
@@ -226,11 +227,14 @@ class Offer {
         const type = OfferType.create(data.type);
         const cadence = OfferCadence.create(data.cadence);
         const duration = OfferDuration.create(data.duration);
+
+        let currency = null;
         let amount;
-        if (type.equals(OfferType.Percent)) {
+        if (type.equals(OfferType.Percentage)) {
             amount = OfferAmount.OfferPercentageAmount.create(data.amount);
-        } else {
-            amount = OfferAmount.OfferAbsoluteAmount.create(data.amount);
+        } else if (type.equals(OfferType.Fixed)) {
+            amount = OfferAmount.OfferFixedAmount.create(data.amount);
+            currency = OfferCurrency.create(data.currency);
         }
 
         if (isNew) {
@@ -255,8 +259,6 @@ class Offer {
             });
         }
 
-        const currency = data.currency;
-
         if (isNew && data.stripe_coupon_id) {
             throw new errors.InvalidOfferCoupon({
                 message: 'Cannot supply a stripe_coupon_id for new Offers.'
diff --git a/ghost/offers/lib/domain/models/OfferCurrency.js b/ghost/offers/lib/domain/models/OfferCurrency.js
new file mode 100644
index 0000000000..4f5cc2026a
--- /dev/null
+++ b/ghost/offers/lib/domain/models/OfferCurrency.js
@@ -0,0 +1,18 @@
+const ValueObject = require('../../shared/ValueObject');
+const InvalidOfferCurrency = require('../../errors').InvalidOfferCurrency;
+
+/** @extends ValueObject<string> */
+class OfferCurrency extends ValueObject {
+    /** @param {unknown} currency */
+    static create(currency) {
+        if (typeof currency !== 'string') {
+            throw new InvalidOfferCurrency({
+                message: 'Offer `currency` must be a string.'
+            });
+        }
+        // TODO: Validate it is a country code we support?
+        return new OfferCurrency(currency);
+    }
+}
+
+module.exports = OfferCurrency;