Adding Flat Tax support with fixed amount (#253)

* Possibility to set a fixed amount on tax types settings

* Pint and manage flat taxes on items

* Fix display errors and handle global taxes

* Tests

* Pint with PHP 8.2 cause with PHP 8.3 version it cause workflow error

* Merging percent and fixed amount into one column

* Now display the currency on SelectTaxPopup on fixed taxes

resources/scripts/admin/components/estimate-invoice-common/CreateTotal.vue

@@ -50,7 +50,12 @@
         v-else-if="store[storeProp].tax_per_item === 'YES'"
         class="m-0 text-sm font-semibold leading-5 text-gray-500 uppercase"
       >
-        {{ tax.name }} - {{ tax.percent }}%
+        <template v-if="tax.calculation_type === 'percentage'">
+          {{ tax.name }} - {{ tax.percent }}%
+        </template>
+        <template v-else>
+          {{ tax.name }} - <BaseFormatMoney :amount="tax.fixed_amount" :currency="defaultCurrency" />
+        </template>
       </label>
 
       <BaseContentPlaceholders v-if="isLoading">
@@ -269,6 +274,8 @@ const itemWiseTaxes = computed(() => {
             amount: Math.round(tax.amount),
             percent: tax.percent,
             name: tax.name,
+            calculation_type: tax.calculation_type,
+            fixed_amount: tax.fixed_amount
           })
         }
       })
@@ -323,10 +330,12 @@ function selectPercentage() {
 
 function onSelectTax(selectedTax) {
   let amount = 0
-  if (props.store.getSubtotalWithDiscount && selectedTax.percent) {
+  if (selectedTax.calculation_type === 'percentage' && props.store.getSubtotalWithDiscount && selectedTax.percent) {
     amount = Math.round(
       (props.store.getSubtotalWithDiscount * selectedTax.percent) / 100
     )
+  } else if (selectedTax.calculation_type === 'fixed') {
+    amount = selectedTax.fixed_amount
   }
 
   let data = {
@@ -336,6 +345,8 @@ function onSelectTax(selectedTax) {
     percent: selectedTax.percent,
     tax_type_id: selectedTax.id,
     amount,
+    calculation_type: selectedTax.calculation_type,
+    fixed_amount: selectedTax.fixed_amount
   }
   props.store.$patch((state) => {
     state[props.storeProp].taxes.push({ ...data })