From c87db85815d84ddf907d0a1d26226a2ab911181b Mon Sep 17 00:00:00 2001
From: MohamedBassem <me@mbassem.com>
Date: Mon, 11 Mar 2024 12:24:51 +0000
Subject: mobile: An ugly yet functional signin workflow

---
 packages/mobile/app/_layout.tsx      |  4 +-
 packages/mobile/app/dashboard.tsx    | 35 +++++++++++++++
 packages/mobile/app/index.tsx        |  7 ++-
 packages/mobile/app/signin.tsx       | 83 ++++++++++++++++++++++++++++++++++--
 packages/mobile/lib/providers.tsx    |  5 ++-
 packages/mobile/lib/settings.ts      | 28 ++++--------
 packages/mobile/lib/storage-state.ts | 50 ++++++++++++++++++++++
 7 files changed, 182 insertions(+), 30 deletions(-)
 create mode 100644 packages/mobile/app/dashboard.tsx
 create mode 100644 packages/mobile/lib/storage-state.ts

diff --git a/packages/mobile/app/_layout.tsx b/packages/mobile/app/_layout.tsx
index b37585e2..d3cbbee1 100644
--- a/packages/mobile/app/_layout.tsx
+++ b/packages/mobile/app/_layout.tsx
@@ -11,9 +11,7 @@ import { Providers } from "@/lib/providers";
 
 export default function RootLayout() {
   const router = useRouter();
-  const { hasShareIntent, shareIntent, resetShareIntent } = useShareIntent({
-    debug: true,
-  });
+  const { hasShareIntent, shareIntent, resetShareIntent } = useShareIntent();
 
   useEffect(() => {
     if (hasShareIntent) {
diff --git a/packages/mobile/app/dashboard.tsx b/packages/mobile/app/dashboard.tsx
new file mode 100644
index 00000000..8be57615
--- /dev/null
+++ b/packages/mobile/app/dashboard.tsx
@@ -0,0 +1,35 @@
+import { useRouter } from "expo-router";
+import { useEffect } from "react";
+import { Text, View } from "react-native";
+
+import Logo from "@/components/Logo";
+import { Button } from "@/components/ui/Button";
+import useAppSettings from "@/lib/settings";
+import { api } from "@/lib/trpc";
+
+export default function Main() {
+  const router = useRouter();
+  const { settings, setSettings, isLoading } = useAppSettings();
+
+  useEffect(() => {
+    if (!isLoading && !settings.apiKey) {
+      router.replace("signin");
+    }
+  }, [settings, isLoading]);
+
+  const onLogout = () => {
+    setSettings({ ...settings, apiKey: undefined });
+  };
+
+  const { data } = api.users.whoami.useQuery();
+
+  return (
+    <View className="flex h-full items-center justify-center gap-4 px-4">
+      <Logo />
+      <Text className="justify-center">
+        Logged in as: {isLoading ? "Loading ..." : data?.email}
+      </Text>
+      <Button label="Log Out" onPress={onLogout} />
+    </View>
+  );
+}
diff --git a/packages/mobile/app/index.tsx b/packages/mobile/app/index.tsx
index e352ba54..557417d7 100644
--- a/packages/mobile/app/index.tsx
+++ b/packages/mobile/app/index.tsx
@@ -3,10 +3,9 @@ import { View } from "react-native";
 
 export default function App() {
   return (
-    <View className="flex-1 items-center justify-center bg-white">
-      <Link href="/signin" className="">
-        Signin
-      </Link>
+    <View className="flex-1 items-center justify-center gap-4 bg-white">
+      <Link href="signin">Signin</Link>
+      <Link href="dashboard">Dashboard</Link>
     </View>
   );
 }
diff --git a/packages/mobile/app/signin.tsx b/packages/mobile/app/signin.tsx
index 95a1cf48..a89b0087 100644
--- a/packages/mobile/app/signin.tsx
+++ b/packages/mobile/app/signin.tsx
@@ -1,24 +1,101 @@
+import { useRouter } from "expo-router";
+import { useEffect, useState } from "react";
 import { View, Text } from "react-native";
 
 import Logo from "@/components/Logo";
 import { Button } from "@/components/ui/Button";
 import { Input } from "@/components/ui/Input";
+import useAppSettings from "@/lib/settings";
+import { api } from "@/lib/trpc";
 
 export default function Signin() {
+  const router = useRouter();
+
+  const { settings, setSettings } = useAppSettings();
+
+  const [error, setError] = useState<string | undefined>();
+
+  const { mutate: login, isPending } = api.apiKeys.exchange.useMutation({
+    onSuccess: (resp) => {
+      setSettings({ ...settings, apiKey: resp.key });
+      router.replace("dashboard");
+    },
+    onError: (e) => {
+      if (e.data?.code === "UNAUTHORIZED") {
+        setError("Wrong username or password");
+      } else {
+        setError(`${e.message}`);
+      }
+    },
+  });
+
+  const [formData, setFormData] = useState<{
+    email: string;
+    password: string;
+  }>({
+    email: "",
+    password: "",
+  });
+
+  useEffect(() => {
+    if (settings.apiKey) {
+      router.navigate("dashboard");
+    }
+  }, [settings]);
+
+  const onSignin = () => {
+    const randStr = (Math.random() + 1).toString(36).substring(5);
+    login({ ...formData, keyName: `Mobile App: (${randStr})` });
+  };
+
   return (
     <View className="flex h-full flex-col justify-center gap-2 px-4">
       <View className="items-center">
         <Logo />
       </View>
+      {error && (
+        <Text className="w-full text-center text-red-500">{error}</Text>
+      )}
+      <View className="gap-2">
+        <Text className="font-bold">Server Address</Text>
+        <Input
+          className="w-full"
+          placeholder="Server Address"
+          value={settings.address}
+          autoCapitalize="none"
+          keyboardType="url"
+          onEndEditing={(e) =>
+            setSettings({ ...settings, address: e.nativeEvent.text })
+          }
+        />
+      </View>
       <View className="gap-2">
         <Text className="font-bold">Email</Text>
-        <Input className="w-full" placeholder="Email" />
+        <Input
+          className="w-full"
+          placeholder="Email"
+          keyboardType="email-address"
+          autoCapitalize="none"
+          value={formData.email}
+          onChangeText={(e) => setFormData((s) => ({ ...s, email: e }))}
+        />
       </View>
       <View className="gap-2">
         <Text className="font-bold">Password</Text>
-        <Input className="w-full" placeholder="Password" secureTextEntry />
+        <Input
+          className="w-full"
+          placeholder="Password"
+          secureTextEntry
+          value={formData.password}
+          onChangeText={(e) => setFormData((s) => ({ ...s, password: e }))}
+        />
       </View>
-      <Button className="w-full" label="Sign In" />
+      <Button
+        className="w-full"
+        label="Sign In"
+        onPress={onSignin}
+        disabled={isPending}
+      />
     </View>
   );
 }
diff --git a/packages/mobile/lib/providers.tsx b/packages/mobile/lib/providers.tsx
index d5638da8..394bad28 100644
--- a/packages/mobile/lib/providers.tsx
+++ b/packages/mobile/lib/providers.tsx
@@ -14,7 +14,10 @@ function getTRPCClient(address: string) {
         async headers() {
           const settings = await getAppSettings();
           return {
-            Authorization: settings ? `Bearer ${settings.apiKey}` : undefined,
+            Authorization:
+              settings && settings.apiKey
+                ? `Bearer ${settings.apiKey}`
+                : undefined,
           };
         },
         transformer: superjson,
diff --git a/packages/mobile/lib/settings.ts b/packages/mobile/lib/settings.ts
index 85296cfa..21f40528 100644
--- a/packages/mobile/lib/settings.ts
+++ b/packages/mobile/lib/settings.ts
@@ -1,33 +1,23 @@
 import * as SecureStore from "expo-secure-store";
-import { useEffect, useState } from "react";
+
+import { useStorageState } from "./storage-state";
 
 const SETTING_NAME = "settings";
 
 export type Settings = {
-  apiKey: string;
+  apiKey?: string;
   address: string;
 };
 
 export default function useAppSettings() {
-  const [settings, setSettings] = useState<Settings>({
-    apiKey: "",
-    address: "",
-  });
-
-  useEffect(() => {
-    SecureStore.setItemAsync(SETTING_NAME, JSON.stringify(settings));
-  }, [settings]);
+  let [[isLoading, settings], setSettings] =
+    useStorageState<Settings>(SETTING_NAME);
 
-  useEffect(() => {
-    SecureStore.getItemAsync(SETTING_NAME).then((val) => {
-      if (!val) {
-        return;
-      }
-      setSettings(JSON.parse(val));
-    });
-  }, []);
+  settings ||= {
+    address: "https://demo.hoarder.app",
+  };
 
-  return { settings, setSettings };
+  return { settings, setSettings, isLoading };
 }
 
 export async function getAppSettings() {
diff --git a/packages/mobile/lib/storage-state.ts b/packages/mobile/lib/storage-state.ts
new file mode 100644
index 00000000..09917c79
--- /dev/null
+++ b/packages/mobile/lib/storage-state.ts
@@ -0,0 +1,50 @@
+import * as SecureStore from "expo-secure-store";
+import * as React from "react";
+
+type UseStateHook<T> = [[boolean, T | null], (value: T | null) => void];
+
+function useAsyncState<T>(
+  initialValue: [boolean, T | null] = [true, null],
+): UseStateHook<T> {
+  return React.useReducer(
+    (
+      state: [boolean, T | null],
+      action: T | null = null,
+    ): [boolean, T | null] => [false, action],
+    initialValue,
+  ) as UseStateHook<T>;
+}
+
+export async function setStorageItemAsync(key: string, value: string | null) {
+  if (value == null) {
+    await SecureStore.deleteItemAsync(key);
+  } else {
+    await SecureStore.setItemAsync(key, value);
+  }
+}
+
+export function useStorageState<T>(key: string): UseStateHook<T> {
+  // Public
+  const [state, setState] = useAsyncState<T>();
+
+  // Get
+  React.useEffect(() => {
+    SecureStore.getItemAsync(key).then((value) => {
+      if (!value) {
+        return null;
+      }
+      setState(JSON.parse(value));
+    });
+  }, [key]);
+
+  // Set
+  const setValue = React.useCallback(
+    (value: T | null) => {
+      setState(value);
+      setStorageItemAsync(key, JSON.stringify(value));
+    },
+    [key],
+  );
+
+  return [state, setValue];
+}
-- 
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