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.skillsSought});

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

  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',
            description: skillsSought
                ? 'Choose up to 3 areas you are looking for in a cofounder'
                : 'Select up to 3 areas in which you are skilled',
            options: SkillOption.values.toList(), // Convert enum values to list
            minSelections: 1,
            maxSelections: 3,
            preSelectedOptions:
                userSkills ?? [], // Pass pre-selected skills to the form
            onSave: (selectedOptions) {
              // Handle saving selected options
              saveSkillsToFirebase(selectedOptions.cast<SkillOption>());
              // Then navigate to another screen or perform any other action???
            },
          );
        }
      },
    );
  }

  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 [];
  }

  void saveSkillsToFirebase(List<SkillOption> selectedOptions) {
    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');
    });
  }
}