Feature/date range validations (#406)

* added ability to compare date field against a date range field start or end

* added a couple of comments

---------

Co-authored-by: jasquat <jasquat@users.noreply.github.com>

spiffworkflow-frontend/src/routes/TaskShow.tsx

@@ -275,13 +275,46 @@ export default function TaskShow() {
     errors: any,
     jsonSchema: any
   ) => {
-    const fieldIdentifierToCompareWith = minimumDateCheck.replace(
+    // field format:
-      /^field:/,
+    //    field:[field_name_to_use]
-      ''
+    //
+    // if field is a range:
+    //    field:[field_name_to_use]:[start or end]
+    //
+    // defaults to "start" in all cases
+    const [_, fieldIdentifierToCompareWith, startOrEnd] =
+      minimumDateCheck.split(':');
+    if (!(fieldIdentifierToCompareWith in formData)) {
+      errors[propertyKey].addError(
+        `was supposed to be compared against '${fieldIdentifierToCompareWith}' but it either doesn't have a value or does not exist`
       );
-    if (fieldIdentifierToCompareWith in formData) {
+      return;
-      const dateToCompareWith = formData[fieldIdentifierToCompareWith];
+    }
-      if (dateToCompareWith) {
+
+    const rawDateToCompareWith = formData[fieldIdentifierToCompareWith];
+    if (!rawDateToCompareWith) {
+      errors[propertyKey].addError(
+        `was supposed to be compared against '${fieldIdentifierToCompareWith}' but that field did not have a value`
+      );
+      return;
+    }
+
+    const [startDate, endDate] =
+      rawDateToCompareWith.split(DATE_RANGE_DELIMITER);
+    let dateToCompareWith = startDate;
+    if (startOrEnd && startOrEnd === 'end') {
+      dateToCompareWith = endDate;
+    }
+
+    if (!dateToCompareWith) {
+      const errorMessage = `was supposed to be compared against '${[
+        fieldIdentifierToCompareWith,
+        startOrEnd,
+      ].join(':')}' but that field did not have a value`;
+      errors[propertyKey].addError(errorMessage);
+      return;
+    }
+
     const dateStringToCompareWith = formatDateString(dateToCompareWith);
     if (dateStringToCompareWith > formattedDateString) {
       let fieldToCompareWithTitle = fieldIdentifierToCompareWith;
@@ -296,16 +329,6 @@ export default function TaskShow() {
         `must be equal to or greater than '${fieldToCompareWithTitle}'`
       );
     }
-      } else {
-        errors[propertyKey].addError(
-          `was supposed to be compared against '${fieldIdentifierToCompareWith}' but that field did not have a value`
-        );
-      }
-    } else {
-      errors[propertyKey].addError(
-        `was supposed to be compared against '${fieldIdentifierToCompareWith}' but it either doesn't have a value or does not exist`
-      );
-    }
   };
 
   const checkMinimumDate = (
@@ -315,6 +338,7 @@ export default function TaskShow() {
     errors: any,
     jsonSchema: any
   ) => {
+    // can be either "today" or another field
     let dateString = formData[propertyKey];
     if (dateString) {
       if (typeof dateString === 'string') {