#if UNITY_IOS
using System.IO;
using UnityEditor;
using UnityEditor.Callbacks;
using UnityEditor.iOS.Xcode;
using UnityEngine;

public class GoogleSignInIOSBuildPatch
{
    [PostProcessBuild(100)]
    public static void OnPostProcessBuild(BuildTarget buildTarget, string pathToBuiltProject)
    {
        if (buildTarget != BuildTarget.iOS) return;

        string plistPath = Path.Combine(pathToBuiltProject, "Info.plist");

        // === Modify Info.plist ===
        PlistDocument plist = new PlistDocument();
        plist.ReadFromFile(plistPath);
        PlistElementDict rootDict = plist.root;

        // 1. Add GIDClientID
        rootDict.SetString("GIDClientID", GameConstants.iOS_ClientID);

        // 2. Add custom URL scheme
        PlistElementArray urlTypes = rootDict.CreateArray("CFBundleURLTypes");
        PlistElementDict urlDict = urlTypes.AddDict();
        PlistElementArray schemes = urlDict.CreateArray("CFBundleURLSchemes");
        schemes.AddString(GameConstants.iOS_URL_Scheme);

        plist.WriteToFile(plistPath);
        Debug.Log("✅ Info.plist patched with GIDClientID and CFBundleURLSchemes.");

        // === Modify UnityAppController.mm ===
        string appControllerPath = Path.Combine(pathToBuiltProject, "Classes", "UnityAppController.mm");
        if (!File.Exists(appControllerPath))
        {
            Debug.LogWarning("⚠️ UnityAppController.mm not found. Skipping patch.");
            return;
        }

        string content = File.ReadAllText(appControllerPath);
        string injection = $"[GIDSignIn sharedInstance].clientID = @\"{GameConstants.iOS_ClientID}\";";

        if (!content.Contains(injection))
        {
            string marker = "didFinishLaunchingWithOptions:(NSDictionary*)launchOptions";
            int index = content.IndexOf(marker);
            if (index > -1)
            {
                int insertAfter = content.IndexOf("{", index) + 1;
                content = content.Insert(insertAfter, "\n    " + injection);
                File.WriteAllText(appControllerPath, content);
                Debug.Log("✅ UnityAppController.mm patched with GIDClientID.");
            }
            else
            {
                Debug.LogWarning("⚠️ didFinishLaunchingWithOptions not found in UnityAppController.mm");
            }
        }
    }
}
#endif