import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../providers/settings_provider.dart';
import '../services/api_service.dart';

class RegisterPage extends StatefulWidget {
  @override
  _RegisterPageState createState() => _RegisterPageState();
}

class _RegisterPageState extends State<RegisterPage> {
  final _usernameController = TextEditingController();
  final _passwordController = TextEditingController();
  bool _isLoading = false;

  void _handleRegister() async {
    if (_usernameController.text.isEmpty || _passwordController.text.isEmpty) {
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text("Please fill in all fields")));
      return;
    }

    setState(() => _isLoading = true);
    final settings = context.read<SettingsProvider>();
    final api = ApiService(settings, null);

    try {
      final response = await api.register(_usernameController.text, _passwordController.text);
      if (response.statusCode == 201) {
        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text("Account created! Please login.")));
        Navigator.pop(context);
      } else {
        final error = jsonDecode(response.body)['error'] ?? "Registration Failed";
        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(error)));
      }
    } catch (e) {
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text("Network Error")));
    } finally {
      if (mounted) setState(() => _isLoading = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("Create Account")),
      body: Center(
        child: SingleChildScrollView(
          padding: const EdgeInsets.symmetric(horizontal: 32.0),
          child: ConstrainedBox(
            constraints: BoxConstraints(maxWidth: 400),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Icon(Icons.person_add_outlined, size: 64, color: Theme.of(context).colorScheme.primary),
                SizedBox(height: 24),
                Text(
                  "Join Hightube",
                  style: Theme.of(context).textTheme.headlineMedium?.copyWith(fontWeight: FontWeight.bold),
                ),
                SizedBox(height: 48),
                TextField(
                  controller: _usernameController,
                  decoration: InputDecoration(
                    labelText: "Desired Username",
                    prefixIcon: Icon(Icons.person),
                    border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
                  ),
                ),
                SizedBox(height: 16),
                TextField(
                  controller: _passwordController,
                  obscureText: true,
                  decoration: InputDecoration(
                    labelText: "Password",
                    prefixIcon: Icon(Icons.lock),
                    border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
                  ),
                ),
                SizedBox(height: 32),
                SizedBox(
                  width: double.infinity,
                  height: 50,
                  child: ElevatedButton(
                    onPressed: _isLoading ? null : _handleRegister,
                    style: ElevatedButton.styleFrom(
                      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
                    ),
                    child: _isLoading ? CircularProgressIndicator() : Text("REGISTER", style: TextStyle(fontWeight: FontWeight.bold)),
                  ),
                ),
                SizedBox(height: 16),
                TextButton(
                  onPressed: () => Navigator.pop(context),
                  child: Text("Already have an account? Login here"),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}