import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
import 'home.dart';


class LoginPage extends StatefulWidget {
  @override
  _LoginPageState createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();
  final _displayNameController = TextEditingController();

  bool _isLogin = true;
  bool _isLoading = false;

  final String baseUrl = 'http://api.dthpp.mercurio.moe';

  Future<void> _handleAuth() async {
    final email = _emailController.text.trim();
    final password = _passwordController.text.trim();

    setState(() {
      _isLoading = true;
    });

    try {
      if (_isLogin) {
        final token = await _login(email, password);
        if (token != null) {
          final prefs = await SharedPreferences.getInstance();
          await prefs.setString('token', token);
          Navigator.pushReplacement(
              context, MaterialPageRoute(builder: (context) => HomePage()));
        }
      } else {
        final uid = await _register(email, password, _displayNameController.text.trim());
        if (uid != null) {
          setState(() {
            _isLogin = true;
          });
          ScaffoldMessenger.of(context).showSnackBar(
              SnackBar(content: Text('Registration successful! Please login.')));
        }
      }
    } catch (e) {
      ScaffoldMessenger.of(context)
          .showSnackBar(SnackBar(content: Text(e.toString())));
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  Future<String?> _login(String email, String password) async {
    final url = Uri.parse('$baseUrl/login');
    final response = await http.post(
      url,
      headers: {'Content-Type': 'application/json'},
      body: json.encode({'email': email, 'password': password}),
    );

    if (response.statusCode == 200) {
      final body = json.decode(response.body);
      return body['uid'];
    } else {
      throw Exception('Login failed: ${response.body}');
    }
  }

  Future<String?> _register(String email, String password, String displayName) async {
    final url = Uri.parse('$baseUrl/register');
    final response = await http.post(
      url,
      headers: {'Content-Type': 'application/json'},
      body: json.encode({
        'email': email,
        'password': password,
        'display_name': displayName,
      }),
    );

    if (response.statusCode == 200) {
      final body = json.decode(response.body);
      return body['uid'];
    } else {
      throw Exception('Registration failed: ${response.body}');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(_isLogin ? 'Login' : 'Register'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          children: [
            TextField(
              controller: _emailController,
              decoration: InputDecoration(labelText: 'Email'),
            ),
            TextField(
              controller: _passwordController,
              decoration: InputDecoration(labelText: 'Password'),
              obscureText: true,
            ),
            if (!_isLogin)
              TextField(
                controller: _displayNameController,
                decoration: InputDecoration(labelText: 'Display Name'),
              ),
            const SizedBox(height: 20),
            _isLoading
                ? CircularProgressIndicator()
                : ElevatedButton(
              onPressed: _handleAuth,
              child: Text(_isLogin ? 'Login' : 'Register'),
            ),
            TextButton(
              onPressed: () {
                setState(() {
                  _isLogin = !_isLogin;
                });
              },
              child: Text(_isLogin
                  ? 'Don\'t have an account? Register'
                  : 'Already have an account? Login'),
            ),
          ],
        ),
      ),
    );
  }
}