fix formula condition

app/javascript/submission_form/payment_step.vue

@@ -92,10 +92,20 @@ export default {
       type: Object,
       required: true
     },
+    readonlyValues: {
+      type: Object,
+      required: false,
+      default: () => ({})
+    },
     values: {
       type: Object,
       required: true
     },
+    fields: {
+      type: Array,
+      required: false,
+      default: () => []
+    },
     submitterSlug: {
       type: String,
       required: true
@@ -109,6 +119,13 @@ export default {
     }
   },
   computed: {
+    fieldsUuidIndex () {
+      return this.fields.reduce((acc, field) => {
+        acc[field.uuid] = field
+
+        return acc
+      }, {})
+    },
     queryParams () {
       return new URLSearchParams(window.location.search)
     },
@@ -182,12 +199,23 @@ export default {
   },
   methods: {
     calculateFormula () {
-      const transformedFormula = this.field.preferences.formula.replace(/{{(.*?)}}/g, (match, uuid) => {
-        return this.values[uuid] || 0.0
+      const transformedFormula = this.normalizeFormula(this.field.preferences.formula).replace(/{{(.*?)}}/g, (match, uuid) => {
+        return this.readonlyValues[uuid] || this.values[uuid] || 0.0
       })
 
       return this.math.evaluate(transformedFormula.toLowerCase())
     },
+    normalizeFormula (formula, depth = 0) {
+      if (depth > 10) return formula
+
+      return formula.replace(/{{(.*?)}}/g, (match, uuid) => {
+        if (this.fieldsUuidIndex[uuid]) {
+          return `(${this.normalizeFormula(this.fieldsUuidIndex[uuid].preferences.formula, depth + 1)})`
+        } else {
+          return match
+        }
+      })
+    },
     async submit () {
       if (this.sessionId) {
         return fetch(this.baseUrl + '/api/stripe_payments/' + this.sessionId, {