import 'package:collection/collection.dart';
import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import '../components/my_elevated_button.dart';
import '../components/text_bold.dart';
import '../constants.dart';
import '../enumerations.dart';
import '../pages/registration_complete_page.dart';
import '../services/auth/auth_service.dart';
import '../utils/helper_dialogs.dart';

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

  final bool isRegProcess;
  final bool isEditMode;

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

class RisksFormPageState extends State<RisksFormPage> {
  AvailabilityOption? availability;
  RiskTolerance? riskPreference;

  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(() {
        if (data != null) {
          // Load Availability option
          if (data[Constants.dbFieldUsersAvailability] != null) {
            availability = AvailabilityOption.values.firstWhereOrNull(
              (x) => x.toString() == data[Constants.dbFieldUsersAvailability],
            );
          }
          // Load Risk Tolerance
          if (data[Constants.dbFieldUsersRiskTolerance] != null) {
            riskPreference = RiskTolerance.values.firstWhereOrNull((x) =>
                x.toString() == data[Constants.dbFieldUsersRiskTolerance]);
          }
        }
      });
    }
  }

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

      await userDoc.set(
        {
          Constants.dbFieldUsersAvailability: availability.toString(),
          Constants.dbFieldUsersRiskTolerance: riskPreference?.toString(),
        },
        SetOptions(merge: true), // avoid overwriting existing data
      );
      return true;
    } catch (e) {
      _showSnackBar(e.toString());
      return false;
    }
  }

  void _showSnackBar(String message) {
    showErrorSnackBar(context, message);
  }

  Future<void> handleSubmit() async {
    if (availability == null) {
      _showSnackBar('Please select an availability option.');
      return;
    }
    if (riskPreference == null) {
      showErrorSnackBar(context, 'Please select a willingness to take risks.');
      return;
    }
    // Handle the form submission logic here
    bool success = await _saveDataToFirebase();
    if (success) {
      _navigate();
    } else {
      _showSnackBar('Failed to save data.');
    }
  }

  void _navigate() {
    if (widget.isRegProcess) {
      Navigator.push(
        context,
        MaterialPageRoute(
          //
          // TODO set following registration page HERE
          //
          builder: (context) => const RegistrationCompletePage(),
        ),
      );
    } else {
      if (widget.isEditMode == true) {
        // pass selectedOptions data back to caller
        Navigator.pop(context, {
          Constants.dbFieldUsersAvailability: availability,
          Constants.dbFieldUsersRiskTolerance: riskPreference,
        });
      } else {
        Navigator.pop(context);
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Personal preferences'),
        actions: [
          if (widget.isEditMode && !widget.isRegProcess)
            IconButton(
              onPressed: handleSubmit,
              icon: const Icon(Icons.save),
            )
        ],
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: SingleChildScrollView(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              const TextBold(text: 'Availability and commitment'),
              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: 40),
              const TextBold(text: 'Risk tolerance'),
              const Text('How do you deal with uncertainty and risk?'),
              ...RiskTolerance.values.map((option) {
                return RadioListTile(
                  title: Text(option.displayName),
                  value: option,
                  groupValue: riskPreference,
                  onChanged: (RiskTolerance? value) {
                    setState(() {
                      riskPreference = value;
                    });
                  },
                );
              }),
              const SizedBox(height: 20),
              Center(
                child: MyElevatedButton(
                  onPressed: handleSubmit,
                  child:
                      Text(widget.isRegProcess ? 'Save and continue' : 'Save'),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}