Add human-readable form of a government domain

This makes it easier to write a good message in the request to go live
submission. And encapsulating it in the `GovernmentDomain` class keeps
the view nice and clean.

app/domains.yml

@@ -53,6 +53,8 @@ innovateuk.gov.uk:
 ncsc.gov.uk:
   owner: National Cyber Security Center
   agreement_signed: true
+nhs.net:
+  owner: NHS
 nhsdigital.nhs.uk: digital.nhs.uk
 digital.nhs.uk:
   owner: NHS Digital

app/main/views/service_settings.py

@@ -172,7 +172,6 @@ def request_to_go_live(service_id):
 @user_has_permissions('manage_service')
 def submit_request_to_go_live(service_id):
     form = RequestToGoLiveForm()
-    agreement_info = GovernmentDomain.from_current_user()
 
     if form.validate_on_submit():
         try:
@@ -182,7 +181,7 @@ def submit_request_to_go_live(service_id):
                     'On behalf of {} ({})\n'
                     '\n---'
                     '\nOrganisation type: {}'
-                    '\nAgreement signed: {} ({})'
+                    '\nAgreement signed: {}'
                     '\nMOU in place: {}'
                     '\nChannel: {}\nStart date: {}\nStart volume: {}'
                     '\nPeak volume: {}'
@@ -191,7 +190,7 @@ def submit_request_to_go_live(service_id):
                     current_service['name'],
                     url_for('main.service_dashboard', service_id=current_service['id'], _external=True),
                     current_service['organisation_type'],
-                    agreement_info.agreement_signed, agreement_info.owner,
+                    GovernmentDomain.from_current_user().as_human_readable,
                     form.mou.data,
                     formatted_list(filter(None, (
                         'email' if form.channel_email.data else None,

app/utils.py

@@ -470,6 +470,26 @@ class GovernmentDomain:
     def from_current_user(cls):
         return cls.from_user(current_user)
 
+    @property
+    def as_human_readable(self):
+        if self.agreement_signed:
+            return 'Yes, on behalf of {}'.format(self.owner)
+        elif self.owner:
+            return '{} (organisation is {}, {})'.format(
+                {
+                    False: 'No',
+                    None: 'Can’t tell',
+                }.get(self.agreement_signed),
+                self.owner,
+                {
+                    True: 'a crown body',
+                    False: 'a non-crown body',
+                    None: 'crown status unknown',
+                }.get(self.crown_status),
+            )
+        else:
+            return 'Can’t tell'
+
     @staticmethod
     def get_matching_function(email_address_or_domain):