import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:http/http.dart' as http;
import 'package:provider/provider.dart';
import 'package:pvt15/models/user_model.dart';
import 'package:pvt15/providers/user_provider.dart';
import 'navigation_controller_page.dart';
import 'package:pvt15/pages/add_user_credentials_page.dart';
import 'package:pvt15/services/auth/auth_service.dart';

class GoogleSignInPage extends StatefulWidget {
  const GoogleSignInPage({super.key});

  @override
  State<GoogleSignInPage> createState() => _GoogleSignInPageState();
}

class _GoogleSignInPageState extends State<GoogleSignInPage> {
  GoogleSignIn signInCredentials = GoogleSignIn(
    scopes: ['email', 'profile', 'openid'],
    serverClientId:
        "63395519979-robk2jog8rd89mi68466259r5arqufm1.apps.googleusercontent.com",
    hostedDomain: '',
  );
  final AuthService authService = AuthService();

  Future<bool> doesUserExist(String? googleID) async {
    if (googleID == null || googleID.isEmpty) {
      return false;
    }
    final url = Uri.parse(
      'https://group-1-15.pvt.dsv.su.se/api/users/$googleID',
    );

    try {
      final response = await http.get(url);

      if (response.statusCode == 200) {
        final jsonData = jsonDecode(response.body);

        return true;
      } else if (response.statusCode == 404) {
        return false;
      } else {
        print(
          'Fel vid anrop till backend: ${response.statusCode} Body: ${response.body}',
        );
        throw Exception(
          'Fel vid anrop till backend: ${response.statusCode} Body: ${response.body}',
        );
      }
    } catch (e) {
      print('Ett fel inträffade vid anrop till backend: $e');
      throw Exception('Ett fel inträffade vid anrop till backend: $e');
    }
  }

  void googleSignIn() async {
    try {
      final GoogleSignInAccount? googleUser = await signInCredentials.signIn();

      if (googleUser != null) {
        final GoogleSignInAuthentication googleAuth =
            await googleUser.authentication;

        final String? idToken = googleAuth.idToken;

        if (idToken != null) {
          final response = await http.post(
            Uri.parse('https://group-1-15.pvt.dsv.su.se/api/auth/google/login'),
            headers: <String, String>{
              'Content-Type': 'application/json; charset=UTF-8',
            },
            body: jsonEncode(<String, String>{'idToken': idToken}),
          );

          if (response.statusCode == 200) {
            final responseData = jsonDecode(response.body);
            final String applicationAccessToken = responseData['accessToken'];
            final String applicationRefreshToken = responseData['refreshToken'];
            final String? username = responseData['username'];

            await authService.saveTokens(
              applicationAccessToken,
              applicationRefreshToken,
            );

            if (username == null) {
              Navigator.push(
                context,
                MaterialPageRoute(
                  builder: (context) => AddUserCredentialPage(user: googleUser),
                ),
              );
            } else {
              final userProvider = Provider.of<UserProvider>(
                context,
                listen: false,
              );
              final String profilePicUrl = googleUser.photoUrl ?? '';
              userProvider.setUser(
                AppUser(
                  googleID: googleUser.id,
                  name: '${googleUser.displayName}',
                  username: username,
                  email: googleUser.email,
                  profilePicUrl: profilePicUrl,
                ),
              );

              Navigator.push(
                context,
                MaterialPageRoute(
                  builder:
                      (context) => NavigationControllerPage(user: googleUser),
                  settings: RouteSettings(name: '/gameCategory'),
                ),
              );
            }
          }
        }
      }
    } catch (e) {
      print('Fel vid Google Sign-In: $e');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        decoration: const BoxDecoration(
          gradient: LinearGradient(
            begin: Alignment.topCenter,
            end: Alignment.bottomCenter,
            colors: [Color(0xFF7A28A5), Color(0xFFF9377B)],
          ),
        ),
        child: Center(
          // Wrappa Column med Center
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              const SizedBox(height: 16),
              Row(
                mainAxisSize: MainAxisSize.min,
                children: [
                  Text(
                    'Hop',
                    textAlign: TextAlign.center,
                    style: TextStyle(
                      color: const Color(0xFFFF5394),
                      fontSize: 60,
                      fontFamily: 'Poppins',
                      fontWeight: FontWeight.w700,
                      height: 0.27,
                      letterSpacing: 0.50,
                      shadows: const [
                        Shadow(
                          offset: Offset(0, 6),
                          blurRadius: 8,
                          color: Color(0x3F000000),
                        ),
                      ],
                    ),
                  ),
                  const SizedBox(width: 0.50),
                  Text(
                    'Spot',
                    style: TextStyle(
                      color: const Color(0xFFFFC83B),
                      fontSize: 60,
                      fontFamily: 'Poppins',
                      fontWeight: FontWeight.w700,
                      height: 0.27,
                      letterSpacing: 0.50,
                      shadows: const [
                        Shadow(
                          offset: Offset(0, 6),
                          blurRadius: 8,
                          color: Color(0x3F000000),
                        ),
                      ],
                    ),
                  ),
                ],
              ),
              const SizedBox(height: 150),
              Image(
                image: AssetImage("assets/images/KMLogga.png"),
                height: 180,
              ),
              const SizedBox(height: 60),
              ElevatedButton(
                onPressed: () {
                  googleSignIn();
                },
                style: ElevatedButton.styleFrom(
                  padding: EdgeInsets.zero,
                  side: BorderSide.none,
                ),
                child: SizedBox(
                  width: 302,
                  height: 70,
                  child: Image.asset(
                    "assets/images/signInGoogleButton.png",
                    fit: BoxFit.cover,
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}