fix(properties): harden diagnostic visual states

src/utils/propertiesDiagnostics.ts

@@ -0,0 +1,41 @@
+import type { TorrentPeerDiagnostics } from '../bindings/TorrentPeerDiagnostics';
+import type { TorrentAvailabilitySnapshot } from '../bindings/TorrentAvailabilitySnapshot';
+import type { PropertiesDiagnosticPhase } from '../propertiesBridge';
+
+export type PropertiesDiagnosticValueState = 'live' | 'loading' | 'stale' | 'error' | 'unavailable';
+
+const getPropertiesDiagnosticValueState = (
+  hasValue: boolean,
+  diagnosticsLoading: boolean,
+  diagnosticPhase: PropertiesDiagnosticPhase,
+): PropertiesDiagnosticValueState => {
+  if (hasValue) {
+    if (diagnosticPhase === 'error') return 'error';
+    if (diagnosticPhase === 'stale') return 'stale';
+    return 'live';
+  }
+  if (diagnosticsLoading) return 'loading';
+  if (diagnosticPhase === 'error') return 'error';
+  if (diagnosticPhase === 'stale') return 'stale';
+  return 'unavailable';
+};
+
+export type PropertiesPeerDiagnosticState = PropertiesDiagnosticValueState;
+
+export const getPropertiesPeerDiagnosticState = (
+  peers: TorrentPeerDiagnostics | null,
+  diagnosticsLoading: boolean,
+  diagnosticPhase: PropertiesDiagnosticPhase,
+): PropertiesPeerDiagnosticState => {
+  return getPropertiesDiagnosticValueState(peers !== null, diagnosticsLoading, diagnosticPhase);
+};
+
+export const getPropertiesAvailabilityDiagnosticState = (
+  availability: TorrentAvailabilitySnapshot | null,
+  diagnosticsLoading: boolean,
+  diagnosticPhase: PropertiesDiagnosticPhase,
+): PropertiesDiagnosticValueState => getPropertiesDiagnosticValueState(
+  availability !== null,
+  diagnosticsLoading,
+  diagnosticPhase,
+);