// ignore_for_file: prefer_const_constructors, prefer_const_literals_to_create_immutables, file_names, use_build_context_synchronously, library_private_types_in_public_api

import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:smilet/SignUpPage/CreateUserPass.dart';
import 'dart:async';
import 'package:http/http.dart' as http;

bool schoolExists = false;
bool userExists = false;
Map schoolDetails = {};

// "Future is a core Dart class for working with async operations."
// Kolla om en skola är registrerad och hämta dess information
Future<void> checkSchool(String code) async {
  var response = await http
      .get(Uri.parse('https://group-15-3.pvt.dsv.su.se/school?code=$code'));

  if (response.statusCode == 200) {
    // If the server did return a 200 OK response,
    // then parse the JSON.
    schoolExists = true;
    schoolDetails =
        jsonDecode(utf8.decode(response.bodyBytes)) as Map<String, dynamic>;
  } else {
    // If the server did not return a 200 OK response,
    // then throw an exception.
    schoolExists = false;
    schoolDetails =
        jsonDecode(utf8.decode(response.bodyBytes)) as Map<String, dynamic>;
  }
}

// Kolla om en användare redan är registrerad med anmälningskoden
Future<void> checkUser(String id) async {
  var response =
      await http.get(Uri.parse('https://group-15-3.pvt.dsv.su.se/user/$id'));

  if (response.statusCode == 200) {
    // If the server did return a 200 OK response,
    // then parse the JSON.
    userExists = true;
  } else {
    // If the server did not return a 200 OK response,
    // then throw an exception.
    userExists = false;
  }
}

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

  @override
  _SignUpPageState createState() => _SignUpPageState();
}

class _SignUpPageState extends State<SignUpPage> {
  final _formKey = GlobalKey<FormState>();
  TextEditingController regNumController = TextEditingController();
  TextEditingController schoolCodeController = TextEditingController();

  int regNumber = 0;
  String schoolCode = "";

  @override
  Widget build(BuildContext context) {
    final textHeadStyle =
        TextStyle(fontSize: 40.0, fontWeight: FontWeight.bold);

    return Scaffold(
        appBar: AppBar(
          centerTitle: true,
          title: Image.asset(
            'assets/images/ml_logo.png',
            height: 40,
          ),
        ),
        // Form för att kunna använda TextFormField
        body: Form(
            key: _formKey,
            child: SingleChildScrollView(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Padding(
                    padding: const EdgeInsets.only(bottom: 20.0),
                    child: Text('Skapa konto',
                        textAlign: TextAlign.center, style: textHeadStyle),
                  ),
                  Padding(
                    padding: const EdgeInsets.all(8.0),
                    child: Container(
                      alignment: Alignment.center,
                      child: SizedBox(
                        width: 300,
                        height: 100,
                        child: TextFormField(
                          maxLength: 8,
                          onChanged: checkUser,
                          controller: regNumController,
                          keyboardType: TextInputType.number,
                          decoration: const InputDecoration(
                            border: OutlineInputBorder(),
                            labelText: 'Midnattsloppet anmälningskod',
                            hintText: 'Ange Midnattsloppet anmälningskod',
                          ),
                          // Kolla numrets giltighet
                          validator: (String? value) {
                            if (value == null) {
                              return "Anmälningskod får inte vara tom!";
                            } else if (!isValidRegNumber(value)) {
                              return 'Ogiltig anmälningskod!';
                            } else if (userExists) {
                              return 'Användare med kod $value finns redan!';
                            } else {
                              return null;
                            }
                          },
                        ),
                      ),
                    ),
                  ),
                  Padding(
                    padding: const EdgeInsets.all(8.0),
                    child: Container(
                      alignment: Alignment.center,
                      child: SizedBox(
                        width: 300,
                        height: 100,
                        child: TextFormField(
                          maxLength: 16,
                          onChanged: checkSchool,
                          controller: schoolCodeController,
                          keyboardType: TextInputType.text,
                          decoration: InputDecoration(
                            border: OutlineInputBorder(),
                            labelText: 'Skolinstitutionskod',
                            hintText: 'Ange skolinstitutionskod',
                          ),
                          validator: (String? value) {
                            return (value != null && isValidSchoolCode(value))
                                ? null
                                : 'Skola ej registrerad!';
                          },
                        ),
                      ),
                    ),
                  ),
                  Padding(
                    padding: const EdgeInsets.all(10.0),
                    child: ElevatedButton(
                        style: TextButton.styleFrom(
                          backgroundColor: Color.fromARGB(255, 10, 179, 74),
                        ),
                        onPressed: () {
                          if (_formKey.currentState!.validate()) {
                            // Spara uppgifterna
                            regNumber = int.parse(regNumController.text);
                            schoolCode = schoolCodeController.text;

                            ScaffoldMessenger.of(context).showSnackBar(
                              SnackBar(
                                  duration: Duration(seconds: 1),
                                  behavior: SnackBarBehavior.floating,
                                  backgroundColor:
                                      Color.fromARGB(255, 12, 148, 64),
                                  content: Text(
                                    "Uppgifter giltiga!",
                                    style: TextStyle(color: Colors.white),
                                  )),
                            );
                            Navigator.push(
                                context,
                                MaterialPageRoute(
                                    builder: (context) => CreateLoginPage(
                                          regNumber: regNumber,
                                          schoolCode: schoolCode,
                                          schoolDetails: schoolDetails,
                                        )));
                          }
                        },
                        child: const Text('Fortsätt',
                            style: TextStyle(color: Colors.white))),
                  ),
                ],
              ),
            )));
  }

  // Hjälparmetod för att avgöra om ett anmälningsnummer är giltigt
  bool isValidRegNumber(String value) {
    try {
      int number = int.parse(value);
      checkUser(value);
      return (number > 1000);
    } on Exception {
      return false;
    }
  }

  // Hjälparmetod för att avgöra om en skolkod är giltig
  bool isValidSchoolCode(String code) {
    try {
      checkSchool(code);
      // Om skola ej finns, ej valid kod
      return schoolExists;
    } on Exception {
      return false;
    }
  }
}