feet/lib/pages/login.dart

import 'package:feet/api/api.dart';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';

class LoginPage extends StatefulWidget {
  final FeverAPI api;
  const LoginPage({ super.key, required this.api });

  @override
  State<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  bool? _validAPI;

  final _urlController = TextEditingController();
  final _usernameController = TextEditingController();
  final _passwordController = TextEditingController();

  final _urlFocus = FocusNode();

  Future<bool> checkUrl() async {
    if (_urlController.text.isNotEmpty) {
      var value = await FeverAPI.isValidAPI(_urlController.text);
      setState(() {
        _validAPI = value;
      });

      return value;
    }

    return false;
  }

  @override
  void initState() {
    super.initState();
    _urlFocus.addListener(() {
      if (!_urlFocus.hasFocus) {
        checkUrl();
      }
    });
  }

  @override
  void dispose() {
    _urlController.dispose();
    _usernameController.dispose();
    _passwordController.dispose();
    _urlFocus.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Log in'),
      ),
      body: Column(
        children: [
          Container(
            padding: const EdgeInsets.all(8.0),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                const Text("Fever compatible API URL"),
                TextField(
                  controller: _urlController,
                  focusNode: _urlFocus,
                  decoration: InputDecoration(
                    border: const OutlineInputBorder(),
                    contentPadding: const EdgeInsets.all(8.0),
                    hintText: 'https://among-us.morbius.sus/api/fever.php',
                    errorText: _validAPI == false ? 'Invalid or unsupported API' : null,
                  )
                ),
              ],
            ),
          ),
          Container(
            padding: const EdgeInsets.all(8.0),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                const Text("Authentication"),
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                  children: [
                    Flexible(child: TextField(
                      controller: _usernameController,
                      decoration: const InputDecoration(
                        border: OutlineInputBorder(),
                        contentPadding: EdgeInsets.all(8.0),
                        hintText: 'Username',
                      ),
                    )),
                    const SizedBox(width: 8),
                    Flexible(child: TextField(
                      controller: _passwordController,
                      decoration: const InputDecoration(
                        border: OutlineInputBorder(),
                        contentPadding: EdgeInsets.all(8.0),
                        hintText: 'Password',
                      ),
                      obscureText: true,
                    )),
                  ],
                ),
              ],
            ),
          ),
          ElevatedButton(
            onPressed: () async {
              if (_urlController.text.isEmpty) return;
              _validAPI ??= await checkUrl();
              if (_validAPI != true || _usernameController.text.isEmpty || _passwordController.text.isEmpty) return;

              var apiKey = FeverAPI.generateApiKey(_usernameController.text, _passwordController.text);
              var isAuthenticated = await FeverAPI.isAuthenticated(_urlController.text, apiKey);

              if (!isAuthenticated) {
                // ignore: use_build_context_synchronously
                showDialog(
                  context: context,
                  builder: (BuildContext context) {
                    return AlertDialog(
                      title: const Text('Authentication failed'),
                      content: const Text('The API URL seems to be valid, but the provided credentials appear to be incorrect.'),
                      actions: [
                        TextButton(onPressed: () => Navigator.of(context).pop(), child: const Text('Got it!')),
                      ],
                    );
                  }
                );

                return;
              }

              final prefs = await SharedPreferences.getInstance();
              await prefs.setString('apiUrl', _urlController.text);
              await prefs.setString('apiKey', apiKey);

              widget.api.apiUrl = _urlController.text;
              widget.api.apiKey = apiKey;
              // ignore: use_build_context_synchronously
              Navigator.of(context).pop();
            },
            child: const Text('Continue'),
          ),
        ],
      ),
    );
  }
}