Add logging, templatize SUMMARY in email templates, templatize complete_application in tests, to integrate FSM inspect the status change that was made in the admin view here and call the transition method that's now defined in the model

src/registrar/models/domain_application.py

@@ -484,6 +484,9 @@ class DomainApplication(TimeStampedModel):
             )
             return
         try:
+            logger.info(
+                f"Submission confirmation email sent to: {self.submitter.email}"
+            )
             send_templated_email(
                 "emails/submission_confirmation.txt",
                 "emails/submission_confirmation_subject.txt",
@@ -493,6 +496,32 @@ class DomainApplication(TimeStampedModel):
         except EmailSendingError:
             logger.warning("Failed to send confirmation email", exc_info=True)
 
+    def _send_in_review_email(self):
+        """Send an email that this application is now in review.
+
+        The email goes to the email address that the submitter gave as their
+        contact information. If there is not submitter information, then do
+        nothing.
+        """
+        if self.submitter is None or self.submitter.email is None:
+            logger.warning(
+                "Cannot send status change (in review) email,"
+                "no submitter email address."
+            )
+            return
+        try:
+            logging.info(f"In review email sent to: {self.submitter.email}")
+            send_templated_email(
+                "emails/status_change_in_review.txt",
+                "emails/status_change_in_review_subject.txt",
+                self.submitter.email,
+                context={"application": self},
+            )
+        except EmailSendingError:
+            logger.warning(
+                "Failed to send status change (in review) email", exc_info=True
+            )
+
     @transition(field="status", source=[STARTED, WITHDRAWN], target=SUBMITTED)
     def submit(self):
         """Submit an application that is started."""
@@ -541,6 +570,14 @@ class DomainApplication(TimeStampedModel):
             user=self.creator, domain=created_domain, role=UserDomainRole.Roles.ADMIN
         )
 
+    @transition(field="status", source=SUBMITTED, target=INVESTIGATING)
+    def in_review(self, updated_domain_application):
+        """Investigate an application that has been submitted."""
+
+        # When an application is moved to in review, we need to send a
+        # confirmation email. This is a side-effect of the state transition
+        updated_domain_application._send_in_review_email()
+
     # ## Form policies ###
     #
     # These methods control what questions need to be answered by applicants