import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:collection/collection.dart';
import 'package:flutter/material.dart';
import '../constants.dart';
import '../enumerations.dart';
import '../forms/corporate_culture_form.dart';
import '../services/auth/auth_service.dart';

class MatchingForm extends StatefulWidget {
  const MatchingForm({super.key, required this.isRegProcess});

  final bool isRegProcess;

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

class MatchingFormState extends State<MatchingForm> {
  Map<VisionOption, bool> selectedVisionOptions = {
    VisionOption.marketLeader: false,
    VisionOption.sustainableBusiness: false,
    VisionOption.innovativeProduct: false,
    VisionOption.exitStrategy: false,
  };
  AvailabilityOption? availability;

  // get instance of auth
  final AuthService _authService = AuthService();

  @override
  void initState() {
    super.initState();
    _loadDataFromFirebase();
  }

  Future<void> _loadDataFromFirebase() async {
    final userDoc = FirebaseFirestore.instance
        .collection(Constants.dbCollectionUsers)
        .doc(_authService.getCurrentUser()!.uid);
    final snapshot = await userDoc.get();

    if (snapshot.exists) {
      final data = snapshot.data();
      setState(() {
        // Load Vision options
        if (data?[Constants.dbFieldUsersVisions] != null) {
          for (var option in VisionOption.values) {
            selectedVisionOptions[option] = data?[Constants.dbFieldUsersVisions]
                .contains(option.toString());
          }
        }
        // Load Availability option
        if (data?[Constants.dbFieldUsersAvailability] != null) {
          availability = AvailabilityOption.values.firstWhereOrNull(
            (e) => e.toString() == data?[Constants.dbFieldUsersAvailability],
          );
        }
      });
    }
  }

  Future<void> _saveDataToFirebase() async {
    final userDoc = FirebaseFirestore.instance
        .collection(Constants.dbCollectionUsers)
        .doc(_authService.getCurrentUser()!.uid);

    await userDoc.set(
      {
        Constants.dbFieldUsersVisions: selectedVisionOptions.entries
            .where((entry) => entry.value)
            .map((entry) => entry.key.toString())
            .toList(),
        Constants.dbFieldUsersAvailability: availability?.toString(),
      },
      SetOptions(merge: true), // avoid overwriting existing data
    );
  }

  bool isVisionSelected() {
    return selectedVisionOptions.containsValue(true);
  }

  void handleSubmit() {
    if (!isVisionSelected()) {
      ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
        content: Text('Please select at least one long-term vision.'),
      ));
      return;
    }
    if (availability == null) {
      ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
        content: Text('Please select an availability option.'),
      ));
      return;
    }
    _saveDataToFirebase();
    // Handle the form submission logic here
    Navigator.push(
      context,
      MaterialPageRoute(
        //
        // set following registration page HERE
        //
        builder: (context) => CultureValuesFormPage(
          isRegProcess: widget.isRegProcess,
        ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Personal preferences'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: SingleChildScrollView(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              const Text(
                'Vision and goals',
                style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
              ),
              const Text('What is your long-term vision for a startup?'),
              ...VisionOption.values.map((option) {
                return CheckboxListTile(
                  title: Text(option.displayName),
                  value: selectedVisionOptions[option],
                  controlAffinity: ListTileControlAffinity.platform,
                  onChanged: (bool? value) {
                    if (value != null) {
                      setState(() {
                        selectedVisionOptions[option] = value;
                      });
                    }
                  },
                );
              }),
              const SizedBox(height: 40),
              const Text(
                'Availability and commitment',
                style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
              ),
              const Text(
                'How much time can you devote to the startup each week?',
              ),
              ...AvailabilityOption.values.map((option) {
                return RadioListTile(
                  title: Text(option.displayName),
                  value: option,
                  groupValue: availability,
                  onChanged: (AvailabilityOption? value) {
                    setState(() {
                      availability = value;
                    });
                  },
                );
              }),
              const SizedBox(height: 20),
              Center(
                child: ElevatedButton(
                  onPressed: handleSubmit,
                  child:
                      Text(widget.isRegProcess ? 'Save and continue' : 'Save'),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}