[skip ci] Initial commit — CodexBar Mobile Expo app

hooks/useCodexUsage.ts

@@ -0,0 +1,65 @@
+import { useState, useCallback, useEffect } from "react";
+import { fetchCodexUsage } from "@/lib/api/codexApi";
+import { loadCodexAuth, saveCodexAuth, clearCodexAuth } from "@/lib/storage";
+import { pickAndReadCodexAuth } from "@/lib/fileReader";
+import type { CodexUsageResponse, CodexAuth } from "@/types/codex";
+
+type Status = "idle" | "loading" | "success" | "error";
+
+export function useCodexUsage() {
+  const [auth, setAuth] = useState<CodexAuth | null>(null);
+  const [usage, setUsage] = useState<CodexUsageResponse | null>(null);
+  const [status, setStatus] = useState<Status>("idle");
+  const [error, setError] = useState<string | null>(null);
+
+  useEffect(() => {
+    loadCodexAuth().then((stored) => {
+      if (stored) setAuth(stored);
+    });
+  }, []);
+
+  const importAuthFile = useCallback(async () => {
+    try {
+      const parsed = await pickAndReadCodexAuth();
+      await saveCodexAuth(parsed);
+      setAuth(parsed);
+      setError(null);
+    } catch (e: unknown) {
+      const msg = e instanceof Error ? e.message : "UNKNOWN_ERROR";
+      if (msg !== "PICKER_CANCELLED") setError(msg);
+    }
+  }, []);
+
+  const refresh = useCallback(async () => {
+    if (!auth) return;
+    setStatus("loading");
+    setError(null);
+    try {
+      const data = await fetchCodexUsage(auth);
+      setUsage(data);
+      setStatus("success");
+    } catch (e: unknown) {
+      const msg = e instanceof Error ? e.message : "UNKNOWN_ERROR";
+      setError(msg);
+      setStatus("error");
+      if (msg === "TOKEN_EXPIRED") {
+        await clearCodexAuth();
+        setAuth(null);
+      }
+    }
+  }, [auth]);
+
+  useEffect(() => {
+    if (auth) void refresh();
+  }, [auth]);
+
+  const clearAuth = useCallback(async () => {
+    await clearCodexAuth();
+    setAuth(null);
+    setUsage(null);
+    setStatus("idle");
+    setError(null);
+  }, []);
+
+  return { auth, usage, status, error, importAuthFile, refresh, clearAuth };
+}