added support in forms and views for sending email on change from member to admin

src/registrar/forms/portfolio.py

@@ -293,6 +293,32 @@ class BasePortfolioMemberForm(forms.ModelForm):
             selected_domain_permission = next((perm for perm in domain_perms if perm in perms), "no_access")
             self.initial["domain_request_permission_member"] = selected_domain_permission
 
+    def is_change_from_member_to_admin(self) -> bool:
+        """
+        Checks if the roles have changed from not containing ORGANIZATION_ADMIN
+        to containing ORGANIZATION_ADMIN.
+        """
+        previous_roles = set(self.initial.get("roles", []))  # Initial roles before change
+        new_roles = set(self.cleaned_data.get("roles", []))  # New roles after change
+
+        return (
+            UserPortfolioRoleChoices.ORGANIZATION_ADMIN not in previous_roles
+            and UserPortfolioRoleChoices.ORGANIZATION_ADMIN in new_roles
+        )
+
+    def is_change_from_admin_to_member(self) -> bool:
+        """
+        Checks if the roles have changed from containing ORGANIZATION_ADMIN
+        to not containing ORGANIZATION_ADMIN.
+        """
+        previous_roles = set(self.initial.get("roles", []))  # Initial roles before change
+        new_roles = set(self.cleaned_data.get("roles", []))  # New roles after change
+
+        return (
+            UserPortfolioRoleChoices.ORGANIZATION_ADMIN in previous_roles
+            and UserPortfolioRoleChoices.ORGANIZATION_ADMIN not in new_roles
+        )
+
 
 class PortfolioMemberForm(BasePortfolioMemberForm):
     """

src/registrar/utility/email_invitations.py

@@ -40,7 +40,7 @@ def send_domain_invitation_email(
         EmailSendingError: If there is an error while sending the email.
     """
     domains = normalize_domains(domains)
-    requestor_email = get_requestor_email(requestor, domains)
+    requestor_email = get_requestor_email(requestor, domains=domains)
 
     _validate_invitation(email, requested_user, domains, requestor, is_member_of_different_org)
 
@@ -99,17 +99,22 @@ def normalize_domains(domains: Domain | list[Domain]) -> list[Domain]:
     return [domains] if isinstance(domains, Domain) else domains
 
 
-def get_requestor_email(requestor, domains):
+def get_requestor_email(requestor, domains=None, portfolio=None):
     """Get the requestor's email or raise an error if it's missing.
 
     If the requestor is staff, default email is returned.
+
+    Raises:
+        MissingEmailError
     """
     if requestor.is_staff:
         return settings.DEFAULT_FROM_EMAIL
 
     if not requestor.email or requestor.email.strip() == "":
-        domain_names = ", ".join([domain.name for domain in domains])
-        raise MissingEmailError(email=requestor.email, domain=domain_names)
+        domain_names = None
+        if domains:
+            domain_names = ", ".join([domain.name for domain in domains])
+        raise MissingEmailError(email=requestor.email, domain=domain_names, portfolio=portfolio)
 
     return requestor.email
 
@@ -191,15 +196,7 @@ def send_portfolio_invitation_email(email: str, requestor, portfolio, is_admin_i
         EmailSendingError: If there is an error while sending the email.
     """
 
-    # Default email address for staff
-    requestor_email = settings.DEFAULT_FROM_EMAIL
-
-    # Check if the requestor is staff and has an email
-    if not requestor.is_staff:
-        if not requestor.email or requestor.email.strip() == "":
-            raise MissingEmailError(email=email, portfolio=portfolio)
-        else:
-            requestor_email = requestor.email
+    requestor_email = get_requestor_email(requestor, portfolio=portfolio)
 
     try:
         send_templated_email(

src/registrar/views/portfolios.py

@@ -15,7 +15,7 @@ from registrar.models.user_domain_role import UserDomainRole
 from registrar.models.user_portfolio_permission import UserPortfolioPermission
 from registrar.models.utility.portfolio_helper import UserPortfolioPermissionChoices, UserPortfolioRoleChoices
 from registrar.utility.email import EmailSendingError
-from registrar.utility.email_invitations import send_domain_invitation_email, send_portfolio_invitation_email
+from registrar.utility.email_invitations import send_domain_invitation_email, send_portfolio_admin_addition_emails, send_portfolio_invitation_email
 from registrar.utility.errors import MissingEmailError
 from registrar.utility.enums import DefaultUserValues
 from registrar.views.utility.mixins import PortfolioMemberPermission
@@ -405,6 +405,19 @@ class PortfolioInvitedMemberEditView(PortfolioMemberEditPermissionView, View):
         portfolio_invitation = get_object_or_404(PortfolioInvitation, pk=pk)
         form = self.form_class(request.POST, instance=portfolio_invitation)
         if form.is_valid():
+            try:
+                if form.is_change_from_member_to_admin():
+                    if not send_portfolio_admin_addition_emails(
+                        email=portfolio_invitation.email,
+                        requestor=request.user,
+                        portfolio=portfolio_invitation.portfolio
+                    ):
+                        messages.warning(self.request, "Could not send email notification to existing organization admins.")
+                elif form.is_change_from_admin_to_member():
+                    # NOTE: need to add portfolio_admin_removal_emails when ready
+                    pass
+            except Exception as e:
+                self._handle_exceptions(e)
             form.save()
             messages.success(self.request, "The member access and permission changes have been saved.")
             return redirect("invitedmember", pk=pk)
@@ -418,6 +431,18 @@ class PortfolioInvitedMemberEditView(PortfolioMemberEditPermissionView, View):
             },
         )
 
+    def _handle_exceptions(self, exception):
+        """Handle exceptions raised during the process."""
+        if isinstance(exception, MissingEmailError):
+            messages.warning(self.request, "Could not send email notification to existing organization admins.")
+            logger.warning(
+                f"Could not send email notification to existing organization admins.",
+                exc_info=True,
+            )
+        else:
+            logger.warning("Could not send email notification to existing organization admins.", exc_info=True)
+            messages.warning(self.request, "Could not send email notification to existing organization admins.")
+
 
 class PortfolioInvitedMemberDomainsView(PortfolioMemberDomainsPermissionView, View):