chore: flip UI and backend validation for project env disabling (#9395)

frontend/src/component/project/ProjectEnvironment/ProjectEnvironment.tsx

@@ -148,8 +148,26 @@ const ProjectEnvironmentList = () => {
         }
     };
 
-    const envIsDisabled = (projectName: string) => {
+    const envIsDisabled = (env: IProjectEnvironment) => {
-        return isOss() && projectName === 'default';
+        return (
+            (isOss() && env.name === 'default') ||
+            (env.projectVisible && onlyOneEnvEnabled())
+        );
+    };
+
+    const onlyOneEnvEnabled = (): boolean => {
+        return (
+            projectEnvironments.filter((env) => env.projectVisible).length === 1
+        );
+    };
+
+    const buildToolTip = (env: IProjectEnvironment): string => {
+        if (env.projectVisible && onlyOneEnvEnabled()) {
+            return 'Cannot disable, at least one environment must be visible in the project';
+        }
+        return env.projectVisible
+            ? 'Hide environment and disable feature flags'
+            : 'Make it visible';
     };
 
     const COLUMNS = useMemo(
@@ -182,13 +200,9 @@ const ProjectEnvironmentList = () => {
                 Cell: ({ row: { original } }: any) => (
                     <ActionCell>
                         <PermissionSwitch
-                            tooltip={
+                            tooltip={buildToolTip(original)}
-                                original.projectVisible
-                                    ? 'Hide environment and disable feature flags'
-                                    : 'Make it visible'
-                            }
                             size='medium'
-                            disabled={envIsDisabled(original.name)}
+                            disabled={envIsDisabled(original)}
                             projectId={projectId}
                             permission={UPDATE_PROJECT}
                             checked={original.projectVisible}

src/lib/features/project/project-service.e2e.test.ts

@@ -2853,13 +2853,6 @@ describe('create project with environments', () => {
         expect(created).toMatchObject(allEnabledEnvs);
     });
 
-    test('an empty list throws an error', async () => {
-        // You shouldn't be allowed to pass an empty list via the API.
-        // This test checks what happens in the event that an empty
-        // list manages to sneak in.
-        await expect(createProjectWithEnvs([])).rejects.toThrow(BadDataError);
-    });
-
     test('it only enables the envs it is asked to enable', async () => {
         const selectedEnvs = ['development', 'production'];
         const created = await createProjectWithEnvs(selectedEnvs);

src/lib/features/project/project-service.ts

@@ -315,12 +315,6 @@ export default class ProjectService {
 
     async validateProjectEnvironments(environments: string[] | undefined) {
         if (environments) {
-            if (environments.length === 0) {
-                throw new BadDataError(
-                    'A project must always have at least one environment.',
-                );
-            }
-
             await this.validateEnvironmentsExist(environments);
         }
     }
@@ -383,7 +377,7 @@ export default class ProjectService {
 
         await this.projectStore.create(data);
 
-        const envsToEnable = newProject.environments?.length
+        const envsToEnable = newProject.environments
             ? newProject.environments
             : (
                   await this.environmentStore.getAll({