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

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;

        rootDict.SetString("GIDClientID", GameConstants.iOS_ClientID);

        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("✅ Patched Info.plist with GIDClientID and URL scheme.");

        // === Modify UnityAppController.mm ===
        string appControllerPath = Path.Combine(pathToBuiltProject, "Classes", "UnityAppController.mm");

        if (!File.Exists(appControllerPath))
        {
            Debug.LogWarning("⚠️ UnityAppController.mm not found.");
            return;
        }

        string content = File.ReadAllText(appControllerPath);

        // 1. Inject #import if missing
        string importLine = "#import <GoogleSignIn/GoogleSignIn.h>";
        if (!content.Contains(importLine))
        {
            int importInsertIndex = content.IndexOf("#import");
            if (importInsertIndex >= 0)
            {
                int endOfLine = content.IndexOf("\n", importInsertIndex);
                content = content.Insert(endOfLine + 1, importLine + "\n");
            }
        }

        // 2. Inject GIDSignIn client ID line
        string injection = $"[GIDSignIn sharedInstance].clientID = @\"{GameConstants.iOS_ClientID}\";";
        if (!content.Contains(injection))
        {
            string marker = "didFinishLaunchingWithOptions:(NSDictionary*)launchOptions";
            int markerIndex = content.IndexOf(marker);
            if (markerIndex >= 0)
            {
                int braceIndex = content.IndexOf("{", markerIndex);
                if (braceIndex >= 0)
                {
                    content = content.Insert(braceIndex + 1, "\n    " + injection);
                }
            }
        }

        File.WriteAllText(appControllerPath, content);
        Debug.Log("✅ Patched UnityAppController.mm with GIDSignIn setup.");
    }
}
#endif