// * Shared widget for text input fields with database integration
// * Features:
// * - Customizable text input field
// * - Database value suggestions
// * - Required field validation
// * - Default value support
// * - Visual feedback for validation state
// * - Dropdown for previous entries

import 'package:fforte/enums/databases.dart';
import 'package:fforte/methods/excursion_db_helper.dart';
import 'package:fforte/methods/place_db_helper.dart';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';

/// Widget for managing text input with database integration
/// Provides suggestions from previous entries and validation
class VarTextField extends StatefulWidget {
  /// Controller for the text input
  final TextEditingController textController;
  /// Localized label/hint text
  final String localization;
  /// Database type (place or excursion)
  final DatabasesEnum dbDesignation;
  /// Database field name
  final String dbName;
  /// Default value key for preferences
  final String? defaultValue;
  /// Whether the field is required
  final bool required;

  const VarTextField({
    super.key,
    required this.textController,
    required this.localization,
    required this.dbName,
    required this.required,
    required this.dbDesignation,
    this.defaultValue,
  });

  @override
  State<VarTextField> createState() => _VarTextFieldState();
}

/// State class for the variable text field widget
class _VarTextFieldState extends State<VarTextField> {
  /// List of previous values from database
  List<String> dbVar = [];

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

    // Load default value if field is empty
    if (widget.textController.text == "" && widget.defaultValue != null) {
      _loadPref();
    }

    // Load previous values from database
    _loadData().then((e) => dbVar = e);
  }

  /// Load previous values from the appropriate database
  /// @return Future[List[String]] List of previous values
  Future<List<String>> _loadData() async {
    List<Map<String, dynamic>> entries = [];
    List<Map<String, dynamic>> templatesEntries = [];

    // Get entries from appropriate database
    if (widget.dbDesignation == DatabasesEnum.place) {
      entries = await PlaceDBHelper().getAllMainEntries();
      templatesEntries = await PlaceDBHelper().getAllTemplates();
    } else if (widget.dbDesignation == DatabasesEnum.excursion) {
      entries = await ExcursionDBHelper().getAllMainEntries();
      templatesEntries = await ExcursionDBHelper().getAllTemplates();
    }

    List<String> erg = [];

    // Extract values for this field from entries
    for (var element in entries) {
      for (var key in element.keys) {
        if (key == widget.dbName && element[key].toString() != "") {
          erg.add(element[key].toString());
        }
      }
    }

    // Extract values from templates
    for (var element in templatesEntries) {
      for (var key in element.keys) {
        if (key == widget.dbName && element[key].toString() != "") {
          erg.add(element[key].toString());
        }
      }
    }

    return erg;
  }

  /// Load default value from preferences
  void _loadPref() {
    Future.delayed(Duration.zero, () async {
      SharedPreferences prefs = await SharedPreferences.getInstance();
      String bLand = prefs.getString(widget.defaultValue!) ?? "";
      setState(() {
        widget.textController.text = bLand;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        // Text input field
        Expanded(
          flex: 5,
          child: TextField(
            controller: widget.textController,
            keyboardType: TextInputType.multiline,
            maxLines: null,
            onChanged: (value) {
              setState(() {
                widget.textController.text = value;
              });
            },
            decoration: InputDecoration(
              hintText: widget.localization,
              // Border color based on required status and value
              enabledBorder:
                  widget.required
                      ? (widget.textController.text.isEmpty
                          ? const UnderlineInputBorder(
                            borderSide: BorderSide(color: Colors.red),
                          )
                          : const UnderlineInputBorder(
                            borderSide: BorderSide(color: Colors.green),
                          ))
                      : const UnderlineInputBorder(
                        borderSide: BorderSide(color: Colors.grey),
                      ),
              focusedBorder:
                  widget.required
                      ? (widget.textController.text.isEmpty
                          ? const UnderlineInputBorder(
                            borderSide: BorderSide(color: Colors.red),
                          )
                          : const UnderlineInputBorder(
                            borderSide: BorderSide(color: Colors.green),
                          ))
                      : const UnderlineInputBorder(
                        borderSide: BorderSide(color: Colors.grey),
                      ),
            ),
          ),
        ),
        const Expanded(child: SizedBox(width: 15)),
        // Dropdown for previous values
        Expanded(
          flex: 1,
          child: Align(
            alignment: Alignment.bottomLeft,
            child: PopupMenuButton<String>(
              onSelected: (String value) {
                setState(() {
                  widget.textController.text = value;
                });
              },
              itemBuilder: (BuildContext context) {
                return dbVar.map((String item) {
                  return PopupMenuItem<String>(value: item, child: Text(item));
                }).toList();
              },
              child: const Icon(Icons.arrow_drop_down),
            ),
          ),
        ),
      ],
    );
  }
}