first android multiplayer edits

Author: Demonofpower

src/Multiplayer/Multiplayer.cs

@@ -8,6 +8,7 @@
 using PolytopiaBackendBase.Game.BindingModels;
 using UnityEngine;
 using Newtonsoft.Json;
+using PolytopiaBackendBase.Auth;
 
 namespace PolyMod.Multiplayer;
 
@@ -27,10 +28,53 @@ internal static void Init()
         Harmony.CreateAndPatchAll(typeof(Client));
         BuildConfig buildConfig = BuildConfigHelper.GetSelectedBuildConfig();
         buildConfig.buildServerURL = BuildServerURL.Custom;
-        buildConfig.customServerURL = LOCAL_SERVER_URL;
+        buildConfig.customServerURL = Plugin.config.backendUrl;
+
+        // Update BackendUri and HttpClient.BaseAddress since PolytopiaBackendAdapter.Instance
+        // was statically initialized before plugins load, so it still points to polytopia-prod.net
+        var uri = new Il2CppSystem.Uri(Plugin.config.backendUrl);
+        PolytopiaBackendAdapter.Instance.UseBackendUri(uri);
+        PolytopiaBackendAdapter.Instance.BackendHttpClient.BaseAddress = uri;
 
         Plugin.logger.LogInfo($"Multiplayer> Server URL set to: {Plugin.config.backendUrl}");
-        Plugin.logger.LogInfo("Multiplayer> GLD patches applied");
+    }
+
+    /// <summary>
+    /// On Android, bypass multiplayer requirements that depend on
+    /// Google Play login, push notifications, and purchases — none of which work
+    /// when running as a wrapper app with a different package identity.
+    /// </summary>
+    [HarmonyPrefix]
+    [HarmonyPatch(typeof(GameManager), nameof(GameManager.IsMultiplayerEnabled), MethodType.Getter)]
+    public static bool GameManager_IsMultiplayerEnabled(ref bool __result)
+    {
+        if (Application.platform != RuntimePlatform.Android) return true;
+        __result = true;
+        return false;
+    }
+
+    /// <summary>
+    /// Replace the Android login flow to skip Google Play Games SDK entirely.
+    /// Uses deviceUniqueIdentifier as the auth code for the Polydystopia backend.
+    /// </summary>
+    [HarmonyPrefix]
+    [HarmonyPatch(typeof(PolytopiaBackendAdapter), "LoginPlatformAndroid")]
+    public static bool LoginPlatformAndroid_Prefix(
+        ref Il2CppSystem.Threading.Tasks.Task<ServerResponse<PolytopiaToken>> __result,
+        PolytopiaBackendAdapter __instance)
+    {
+        if (Application.platform != RuntimePlatform.Android) return true;
+
+        // Mark social login as cached so the post-login flow doesn't bail out
+        __instance.HasSocialLoginCached = true;
+
+        var model = new LoginGooglePlayBindingModel();
+        model.AuthCode = SystemInfo.deviceUniqueIdentifier;
+        model.DeviceId = SystemInfo.deviceUniqueIdentifier;
+
+        Plugin.logger.LogInfo($"Multiplayer> Android login with DeviceId: {model.DeviceId}");
+        __result = __instance.LoginGooglePlay(model);
+        return false;
     }
 
     [HarmonyPostfix]
@@ -192,6 +236,9 @@ private static bool BackendAdapter_StartLobbyGame_Modded(
         BackendAdapter __instance,
         StartLobbyBindingModel model)
     {
+        // On Android, let the game's original StartLobbyGame handle it
+        if (Application.platform == RuntimePlatform.Android) return true;
+
         Plugin.logger.LogInfo("Multiplayer> BackendAdapter_StartLobbyGame_Modded");
         var taskCompletionSource = new Il2CppSystem.Threading.Tasks.TaskCompletionSource<ServerResponse<LobbyGameViewModel>>();