# Sign-In Redirect Fix - ChooseServiceScreen

## Issue
After successful sign-in, users should be redirected to `ChooseServiceScreen` instead of other screens.

## Changes Made

### 1. Updated MAIN Graph Start Destination
**File**: `MainNavGraph.kt`

Changed the start destination of MAIN graph to `ChooseServiceScreen`:
```kotlin
navigation(
    route = Graph.MAIN,
    startDestination = AppScreen.chooseService("1") // ✅ ChooseServiceScreen
)
```

### 2. Simplified Sign-In Navigation
**File**: `AuthNavGraph.kt`

Simplified the `onSuccess` callback to navigate directly to `Graph.MAIN`, which automatically uses the start destination (`ChooseServiceScreen`):

**Before**:
```kotlin
onSuccess = { 
    // Complex navigation with delays and multiple steps
    navController.navigate(Graph.MAIN) { ... }
    // Then navigate to ChooseServiceScreen after delay
    CoroutineScope(Dispatchers.Main).launch {
        delay(200)
        navController.navigate(AppScreen.chooseService("1")) { ... }
    }
}
```

**After**:
```kotlin
onSuccess = { 
    // Simple navigation - MAIN graph starts at ChooseServiceScreen
    navController.navigate(Graph.MAIN) {
        popUpTo(Graph.AUTH) { inclusive = true }
        launchSingleTop = true
    }
}
```

### 3. Updated Sign-In Flow Comments
**File**: `OTPScreen.kt`

Updated comments to clarify that sign-in navigates to ChooseServiceScreen:
```kotlin
if (isSignInFlow) {
    // For existing users (sign-in), navigate to ChooseServiceScreen
    android.util.Log.d("OTPScreen", "Existing user - navigating to ChooseServiceScreen")
    onSuccess() // This navigates to ChooseServiceScreen
}
```

## Navigation Flow

### Sign-In Flow:
1. User enters phone number → `SignInScreen`
2. User enters OTP → `OTPScreen`
3. OTP verified → `authManager.login()` succeeds
4. Tokens saved → `mainViewModel.refreshAuthStatus()` called
5. `onSuccess()` callback triggered
6. Navigate to `Graph.MAIN` → **ChooseServiceScreen** ✅

### Sign-Up Flow:
1. User fills signup form → `SignUpScreen`
2. User enters OTP → `OTPScreen`
3. OTP verified → User created/updated
4. Signup API called → Profile updated
5. Navigate to `Graph.MAIN` → **ChooseServiceScreen** ✅

### App Startup Flow:
1. App opens → `MainViewModel` checks tokens
2. If tokens valid → `authState = Authenticated`
3. `AppNavigation` sets `startDestination = Graph.MAIN`
4. `Graph.MAIN` starts at **ChooseServiceScreen** ✅

## Route Structure

### MAIN Graph:
- **Start Destination**: `choose_service/1` (ChooseServiceScreen)
- **Other Routes**: 
  - `buy_animals` (BuyScreen)
  - `create_profile/{name}` (CreateProfileScreen)
  - etc.

### AUTH Graph:
- **Start Destination**: `landing` (LandingScreen)
- **Other Routes**:
  - `sign_in` (SignInScreen)
  - `sign_up` (SignUpScreen)
  - `otp/{phoneNumber}/{name}` (OTPScreen)
  - etc.

## Testing

### ✅ Test Sign-In:
1. Open app → Landing screen
2. Click "Sign In"
3. Enter phone number
4. Enter OTP
5. After successful verification → Should navigate to **ChooseServiceScreen** ✅

### ✅ Test Sign-Up:
1. Open app → Landing screen
2. Click "Sign Up"
3. Fill form and enter OTP
4. After successful signup → Should navigate to **ChooseServiceScreen** ✅

### ✅ Test App Reopen (Logged In):
1. Sign in to app
2. Close app completely
3. Reopen app
4. Should open directly to **ChooseServiceScreen** ✅

## Summary

✅ **Sign-in redirect fixed**:
- After successful sign-in → Navigates to **ChooseServiceScreen**
- After successful sign-up → Navigates to **ChooseServiceScreen**
- App reopen (logged in) → Opens to **ChooseServiceScreen**

✅ **Navigation simplified**:
- Removed complex navigation with delays
- Uses graph start destination automatically
- Cleaner, more maintainable code

✅ **Consistent routing**:
- All authenticated users go to ChooseServiceScreen
- All unauthenticated users go to LandingScreen
- No navigation inconsistencies

The sign-in flow now correctly redirects users to ChooseServiceScreen after successful authentication.