refactor: improve error handling in safeApiCall

This commit improves error handling in the `safeApiCall` function:

- Handles `HttpException` specifically
 to provide more informative error messages based on HTTP status codes (401, 403, 404).
- Removes unnecessary empty block in `Resource.Loading`.
- Adds logging of access and refresh tokens in `TokenManager`.

app/src/main/java/com/samuelokello/kazihub/utils/Resource.kt

@@ -3,7 +3,5 @@ package com.samuelokello.kazihub.utils
 sealed class Resource <T>(val data: T? = null, val message: String? = null) {
     class Success<T>(data: T) : Resource<T>(data)
     class Error<T>(message: String, data: T? = null) : Resource<T>(data, message)
-    class Loading<T> : Resource<T>() {
-
-    }
+    class Loading<T> : Resource<T>()
 }

app/src/main/java/com/samuelokello/kazihub/utils/TokenManager.kt

@@ -1,5 +1,6 @@
 package com.samuelokello.kazihub.utils
 
+import android.util.Log
 import javax.inject.Inject
 
 // TokenManager.kt
@@ -10,6 +11,8 @@ class TokenManager @Inject constructor() {
     fun setToken(access: String, refresh: String) {
         accessToken = access
         refreshToken = refresh
+        Log.d("TokenManager", "Access Token: $accessToken")
+        Log.d("TokenManager", "Refresh Token: $refreshToken")
     }
 
     fun getAccessToken(): String = accessToken

app/src/main/java/com/samuelokello/kazihub/utils/safeApiCall.kt

@@ -2,13 +2,21 @@ package com.samuelokello.kazihub.utils
 
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
+import retrofit2.HttpException
 
 suspend fun <T> safeApiCall(apiCall: suspend () -> T): Resource<T> {
-        return withContext(Dispatchers.IO) {
-            try {
-                Resource.Success(apiCall.invoke())
-            } catch (throwable: Throwable) {
-                Resource.Error(throwable.localizedMessage ?: "An unexpected error occurred")
+    return withContext(Dispatchers.IO) {
+        try {
+            Resource.Success(apiCall.invoke())
+        } catch (throwable: HttpException) {
+            when (throwable.code()) {
+                401 -> Resource.Error("Unauthorized. Please log in again.")
+                403 -> Resource.Error("Forbidden. You don't have permission to access this resource.")
+                404 -> Resource.Error("Resource not found.")
+                else -> Resource.Error("An error occurred: ${throwable.message()}")
             }
+        } catch (throwable: Throwable) {
+            Resource.Error(throwable.localizedMessage ?: "An unexpected error occurred")
         }
-    }
+    }
+}