refactor(infra): split provider usage

src/infra/provider-usage.fetch.gemini.ts

@@ -0,0 +1,81 @@
+import { fetchJson } from "./provider-usage.fetch.shared.js";
+import { clampPercent, PROVIDER_LABELS } from "./provider-usage.shared.js";
+import type {
+  ProviderUsageSnapshot,
+  UsageProviderId,
+  UsageWindow,
+} from "./provider-usage.types.js";
+
+type GeminiUsageResponse = {
+  buckets?: Array<{ modelId?: string; remainingFraction?: number }>;
+};
+
+export async function fetchGeminiUsage(
+  token: string,
+  timeoutMs: number,
+  fetchFn: typeof fetch,
+  provider: UsageProviderId,
+): Promise<ProviderUsageSnapshot> {
+  const res = await fetchJson(
+    "https://cloudcode-pa.googleapis.com/v1internal:retrieveUserQuota",
+    {
+      method: "POST",
+      headers: {
+        Authorization: `Bearer ${token}`,
+        "Content-Type": "application/json",
+      },
+      body: "{}",
+    },
+    timeoutMs,
+    fetchFn,
+  );
+
+  if (!res.ok) {
+    return {
+      provider,
+      displayName: PROVIDER_LABELS[provider],
+      windows: [],
+      error: `HTTP ${res.status}`,
+    };
+  }
+
+  const data = (await res.json()) as GeminiUsageResponse;
+  const quotas: Record<string, number> = {};
+
+  for (const bucket of data.buckets || []) {
+    const model = bucket.modelId || "unknown";
+    const frac = bucket.remainingFraction ?? 1;
+    if (!quotas[model] || frac < quotas[model]) quotas[model] = frac;
+  }
+
+  const windows: UsageWindow[] = [];
+  let proMin = 1;
+  let flashMin = 1;
+  let hasPro = false;
+  let hasFlash = false;
+
+  for (const [model, frac] of Object.entries(quotas)) {
+    const lower = model.toLowerCase();
+    if (lower.includes("pro")) {
+      hasPro = true;
+      if (frac < proMin) proMin = frac;
+    }
+    if (lower.includes("flash")) {
+      hasFlash = true;
+      if (frac < flashMin) flashMin = frac;
+    }
+  }
+
+  if (hasPro)
+    windows.push({
+      label: "Pro",
+      usedPercent: clampPercent((1 - proMin) * 100),
+    });
+  if (hasFlash)
+    windows.push({
+      label: "Flash",
+      usedPercent: clampPercent((1 - flashMin) * 100),
+    });
+
+  return { provider, displayName: PROVIDER_LABELS[provider], windows };
+}