[WEB-1657] dev: admin application code structuring. (#4867)

* [WEB-1657] dev: admin application code structuring.

* chore: update mobx-react-lite import to mobx-react.

admin/core/lib/instance-provider.tsx

@@ -0,0 +1,55 @@
+import { FC, ReactNode } from "react";
+import { observer } from "mobx-react";
+import useSWR from "swr";
+// components
+import { LogoSpinner } from "@/components/common";
+import { InstanceSetupForm, InstanceFailureView } from "@/components/instance";
+// hooks
+import { useInstance } from "@/hooks/store";
+// layout
+import { DefaultLayout } from "@/layouts/default-layout";
+
+type InstanceProviderProps = {
+  children: ReactNode;
+};
+
+export const InstanceProvider: FC<InstanceProviderProps> = observer((props) => {
+  const { children } = props;
+  // store hooks
+  const { instance, error, fetchInstanceInfo } = useInstance();
+  // fetching instance details
+  useSWR("INSTANCE_DETAILS", () => fetchInstanceInfo(), {
+    revalidateOnFocus: false,
+    revalidateIfStale: false,
+    errorRetryCount: 0,
+  });
+
+  if (!instance && !error)
+    return (
+      <div className="flex h-screen min-h-[500px] w-full justify-center items-center">
+        <LogoSpinner />
+      </div>
+    );
+
+  if (error) {
+    return (
+      <DefaultLayout>
+        <div className="relative h-full w-full overflow-y-auto px-6 py-10 mx-auto flex justify-center items-center">
+          <InstanceFailureView />
+        </div>
+      </DefaultLayout>
+    );
+  }
+
+  if (!instance?.is_setup_done) {
+    return (
+      <DefaultLayout>
+        <div className="relative h-full w-full overflow-y-auto px-6 py-10 mx-auto flex justify-center items-center">
+          <InstanceSetupForm />
+        </div>
+      </DefaultLayout>
+    );
+  }
+
+  return <>{children}</>;
+});