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

class SkillsForm extends StatelessWidget {
  SkillsForm({
    super.key,
    required this.isRegProcess,
    required this.skillsSought,
  });

  // get instance of firestore and auth
  final FirebaseFirestore _firestore = FirebaseFirestore.instance;
  final AuthService _authService = AuthService();

  final bool isRegProcess;
  final bool skillsSought; // flag to toggle offered and sought skills

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<List<SkillOption>>(
      future: getSkillsFromFirebase(), // Fetch skills from Firebase
      builder: (context, snapshot) {
        if (snapshot.connectionState == ConnectionState.waiting) {
          // Show loading indicator while fetching data
          return const CircularProgressIndicator();
        } else if (snapshot.hasError) {
          return Text('Error: ${snapshot.error}');
        } else {
          List<SkillOption>? userSkills = snapshot.data;
          return ProfileCategoryForm(
            title: 'Skills',
            header:
                skillsSought ? 'Skills you are looking for' : 'Your own skills',
            description: skillsSought
                ? 'Choose up to 3 areas you are looking for in a co-founder'
                : 'Select up to 3 areas in which you are skilled',
            saveButtonText: isRegProcess ? 'Save and continue' : 'Save',
            options: SkillOption.values.toList(), // Convert enum values to list
            minSelections: 1,
            maxSelections: 3,
            preSelectedOptions:
                userSkills ?? [], // Pass pre-selected skills to the form
            onSave: (selectedOptions) async {
              // Handle saving selected options
              bool success = await saveSkillsToFirebase(
                  selectedOptions.cast<SkillOption>());

              // Then navigate to another screen or perform any other action???
              if (context.mounted) {
                if (success) {
                  Navigator.push(
                    context,
                    MaterialPageRoute(
                      builder: (context) => SkillsForm(
                        isRegProcess: isRegProcess,
                        skillsSought: true,
                      ),
                    ),
                  );
                } else {
                  ScaffoldMessenger.of(context).showSnackBar(
                    const SnackBar(
                      content: Text('Failed to save user skills.'),
                    ),
                  );
                }
              }
            },
          );
        }
      },
    );
  }

  Future<List<SkillOption>> getSkillsFromFirebase() async {
    // Fetch skills from Firestore
    String currentUserId = _authService.getCurrentUser()!.uid;
    DocumentSnapshot userDoc = await _firestore
        .collection(Constants.dbCollectionUsers)
        .doc(currentUserId)
        .get();

    if (userDoc.exists && userDoc.data() != null) {
      Map<String, dynamic> userData =
          userDoc.data()! as Map<String, dynamic>; // Explicit cast

      List<dynamic>? skills;
      if (skillsSought) {
        skills = userData[Constants.dbFieldUsersSkillsSought];
      } else {
        skills = userData[
            Constants.dbFieldUsersSkills]; //as List<dynamic>?; // Explicit cast
      }

      if (skills != null && skills.isNotEmpty) {
        // Convert skills from strings to enum values
        List<SkillOption> userSkills = skills
            .map((skill) => SkillOption.values
                .firstWhere((x) => x.toString() == 'SkillOption.$skill'))
            .toList();
        return userSkills;
      }
    }

    return [];
  }

  Future<bool> saveSkillsToFirebase(List<SkillOption> selectedOptions) async {
    try {
      String currentUserId = _authService.getCurrentUser()!.uid;

      // Convert enum values to strings, removing leading EnumType with split
      List<String> skills = selectedOptions
          .map((option) => option.toString().split('.').last)
          .toList();

      // Update the corresponding 'skills' field in the user's document
      String keyToUpdate = skillsSought
          ? Constants.dbFieldUsersSkillsSought
          : Constants.dbFieldUsersSkills;

      _firestore
          .collection(Constants.dbCollectionUsers)
          .doc(currentUserId)
          .update({
        keyToUpdate: skills,
      }).then((_) {
        print('$keyToUpdate saved to Firebase: $skills');
      }).catchError((error) {
        print('Failed to save $keyToUpdate: $error');
      });

      return true;
    } catch (e) {
      return false;
    }
  }
}