feat: add loyalty point earning and redemption in POS

src/pages/POS/LoyaltyprogramModal.vue

@@ -27,6 +27,7 @@
       :border="true"
       :value="sinvDoc.loyaltyPoints"
       :df="sinvDoc.fieldMap.loyaltyPoints"
+      @change="updateLoyaltyPoints"
     />
 
     <div class="row-start-6 grid grid-cols-2 gap-4 mt-auto mb-2 px-10">
@@ -34,6 +35,7 @@
         <Button
           class="w-full bg-green-500"
           style="padding: 1.35rem"
+          @click="setLoyaltyPoints()"
           :disabled="validationError"
         >
           <slot>
@@ -110,7 +112,56 @@ export default defineComponent({
     };
   },
   methods: {
+    async updateLoyaltyPoints(newValue: number) {
+      try {
+        if (this.loyaltyPoints >= newValue) {
+          this.sinvDoc.loyaltyPoints = newValue;
+        } else {
+          throw new Error(
+            `${this.sinvDoc.party as string} only has ${
+              this.loyaltyPoints as number
+            } points`
+          );
+        }
 
+        const loyaltyProgramDoc = await this.fyo.db.getAll(
+          ModelNameEnum.LoyaltyProgram,
+          {
+            fields: ['conversionFactor'],
+            filters: { name: this.loyaltyProgram as string },
+          }
+        );
+
+        const loyaltyPoint =
+          newValue * ((loyaltyProgramDoc[0]?.conversionFactor as number) || 0);
+
+        if (this.sinvDoc.baseGrandTotal?.lt(loyaltyPoint)) {
+          throw new Error(
+            t`no need ${newValue as number} points to purchase this item`
+          );
+        }
+        this.validationError = false;
+      } catch (error) {
+        this.validationError = true;
+        showToast({
+          type: 'error',
+          message: t`${error as string}`,
+        });
+
+        return;
+      }
+    },
+    setLoyaltyPoints() {
+      if (
+        !this.sinvDoc.loyaltyPoints ||
+        this.sinvDoc.loyaltyPoints > this.loyaltyPoints
+      ) {
+        return;
+      }
+
+      this.$emit('setLoyaltyPoints', this.sinvDoc.loyaltyPoints);
+      this.$emit('toggleModal', 'LoyaltyProgram');
+    },
   },
 });
 </script>

src/pages/POS/POS.vue

@@ -27,6 +27,7 @@
       :sinvDoc="sinvDoc"
       :loyalty-points="loyaltyPoints"
       :loyalty-program="loyaltyProgram"
+      @set-loyalty-points="setLoyaltyPoints"
       @toggle-modal="toggleModal"
     />
 
@@ -553,6 +554,23 @@ export default defineComponent({
     setTotalTaxedAmount() {
       this.totalTaxedAmount = getTotalTaxedAmount(this.sinvDoc as SalesInvoice);
     },
+    async setLoyaltyPoints(value: number) {
+      this.appliedLoyaltyPoints = value;
+
+      this.sinvDoc.redeemLoyaltyPoints = true;
+
+      const totalLotaltyAmount = await getAddedLPWithGrandTotal(
+        this.fyo,
+        this.loyaltyProgram as string,
+        value as number
+      );
+
+      const total = totalLotaltyAmount
+        .sub(this.sinvDoc.baseGrandTotal as Money)
+        .abs();
+
+      this.sinvDoc.grandTotal = total;
+    },
     setTransferAmount(amount: Money = fyo.pesa(0)) {
       this.transferAmount = amount;
     },