import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:responsive_builder/responsive_builder.dart';

import '../../widgets/custom_text_field.dart';
import '../../widgets/custom_text_itnerary_sub.dart';

class TrainScreen extends StatefulWidget {

  final Map<String, dynamic>? apiData;
  final Function(Map<String, dynamic>)onSavetrain;
  final Function(bool) onClose;
  final Map<String, dynamic>? selectedItem;
  final String? loginUser;

  TrainScreen({
    required this.onClose, this.apiData, required this.onSavetrain, required this.selectedItem, required this.loginUser});

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

class _TrainScreenState extends State<TrainScreen> {
  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();

  Map<String, String?> selectedValues = {};

  final FocusNode _trainNoFocusNode = FocusNode();
  final FocusNode _hotelNameFocusNode = FocusNode();
  final FocusNode _fromFocusNode = FocusNode();
  final FocusNode _toFocusNode = FocusNode();
  final FocusNode _dateFocusNode = FocusNode();
  final FocusNode _timeFocusNode = FocusNode();
  final FocusNode _commentsFocusNode = FocusNode();


  late TextEditingController _trainNoController = TextEditingController();
  late TextEditingController _hotelNameController = TextEditingController();
  late TextEditingController _fromController = TextEditingController();
  late TextEditingController _toController = TextEditingController();
  late TextEditingController _dateController = TextEditingController();
  late TextEditingController _timeController = TextEditingController();
  late TextEditingController _trainCommentsController = TextEditingController();

  bool _trainNoFocused = false;
  bool _isHotelNameFocused = false;
  bool _fromFocus = false;
  bool _toFocus = false;
  bool _dateFocus = false;
  bool _timeFocus = false;
  bool _commentsFocus = false;

  String? selectedClass;

  Map<String, String> errorMessages = {};

  Map<String , dynamic> get trainData {
    Map<String, dynamic> data ={

      "train_no":  _trainNoController.text,
      "class":  selectedClass,
      "from_station": _fromController.text,
      "to_station": _toController.text,
      "date": _dateController.text,
      "time": _timeController.text,
      "comments": _trainCommentsController.text,
      "created_by": widget.loginUser,
      "updated_by": widget.loginUser,
    };

    if (widget.selectedItem != null) {
      if (widget.selectedItem?["indx"] != null && widget.selectedItem?["indx"] != 0) {
        data["indx"] = widget.selectedItem!["indx"];
      } else if (widget.selectedItem?["train_id"] != null && widget.selectedItem?["train_id"] != 0) {
        data["train_id"] = widget.selectedItem!["train_id"];
      }
    }

    return data;
  }

  TextEditingController initController(String key) {
    return TextEditingController(text: widget.selectedItem?[key] ?? "");
  }


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

      _trainNoFocusNode.addListener(() {
      setState(() {
        _trainNoFocused = _trainNoFocusNode.hasFocus;
      });
    });
      _hotelNameFocusNode.addListener(() {
        setState(() {
          _isHotelNameFocused = _hotelNameFocusNode.hasFocus;
        });
      });
      _fromFocusNode.addListener(() {
        setState(() {
          _fromFocus = _fromFocusNode.hasFocus;
        });
      });
      _toFocusNode.addListener(() {
        setState(() {
          _toFocus = _toFocusNode.hasFocus;
        });
      });
      _dateFocusNode.addListener(() {
        setState(() {
          _dateFocus = _fromFocusNode.hasFocus;
        });
      });
      _timeFocusNode.addListener(() {
        setState(() {
          _timeFocus = _timeFocusNode.hasFocus;
        });
      });
      _commentsFocusNode.addListener(() {
        setState(() {
          _commentsFocus = _commentsFocusNode.hasFocus;
        });
      });


    _trainCommentsController = initController("comments");
    _trainNoController = initController("train_no");
    _fromController = initController("from_station");
    _toController = initController("to_station");
    _dateController = initController("date");
    _timeController = initController("time");

    // Set the selected value if available
    if (widget.selectedItem != null && widget.selectedItem!["class"] != null) {
    selectedClass = widget.selectedItem!["class"].toString();
    }

    _trainNoController.addListener(() => _clearError("train_no"));
    _fromController.addListener(() => _clearError("from_station"));
    _toController.addListener(() => _clearError("to_station"));
    _dateController.addListener(() => _clearError("date"));
    _timeController.addListener(() => _clearError("time"));

  }


  @override
  void dispose() {
    _trainNoFocusNode.dispose();
    _trainNoController.dispose();
    _hotelNameController.dispose();
    _fromController.dispose();
    _toController.dispose();
    _dateController.dispose();
    _timeController.dispose();
    _trainCommentsController.dispose();
    super.dispose();
  }


  void _clearError(String field) {
    if (mounted && errorMessages.containsKey(field)) {
      setState(() {
        errorMessages.remove(field);
      });
    }
  }


  bool isValidData(Map<String, dynamic> data) {
    errorMessages.clear(); // Reset errors

    // Required fields that must not be empty
    List<String> requiredFields = ["train_no", "class","from_station", "to_station","date","time"];

    // Check validation for each field
    for (String field in requiredFields) {
      if (data[field] == null || data[field].toString().trim().isEmpty) {
        errorMessages[field] = "Required";
      }
    }

    return errorMessages.isEmpty; // Valid if there are no errors
  }


  void handleSave(){

    print( "Handle Save accomadationData $trainData");

    Map<String,dynamic> data = trainData;

    if (!isValidData(data)) {
      print("Validation Failed: Required fields are missing.");
      setState(() {});
      return; // Stop execution if validation fails
    }else {
      widget.onSavetrain(trainData);
    }

    widget.onClose(false);// Close screen after saving
  }





  @override
  Widget build(BuildContext context) {
    return ResponsiveBuilder(builder: (context, sizingInfo) {
      bool isMobile = sizingInfo.isMobile;
      bool isDesktop = sizingInfo.deviceScreenType == DeviceScreenType.desktop;

      return Container(
        color: Color(0xFFF4F4FB),
        child: Form(
          key: _formKey,
          child: Padding(
            padding: const EdgeInsets.all(16.0),
            child: Column(
              children: [
                Align(
                  alignment: Alignment.centerRight,
                  child: InkWell(
                    onTap: () {
                      widget.onClose(false);
                    },
                    child: Icon(
                      Icons.close,
                      size: 18,
                      color: Color(0xFF575A74),
                    ),
                  ),
                ),
                Text("Train Booking List",
                    style:
                    TextStyle(fontSize: 18, fontWeight: FontWeight.bold,color: Color(0xFF575A74))),
                SizedBox(
                  height: 6,
                ),
                Padding(
                  padding: const EdgeInsets.all(28.0),
                  child: Center(
                    child: Column(children: _buildAccomadtionForm(isDesktop)),
                  ),
                )
              ],
            ),
          ),
        ),
      );
    });
  }

  List<Widget> _buildAccomadtionForm (bool isDesktop) {
    List<Widget> buildResponsiveRow(List<Widget> children) {
      return [
        isDesktop ? Row(children: children) : Column(children: children),
        SizedBox(height: 10),
      ];
    }

    List<List<Widget>> rowBuilders = [
      _builClassType(isDesktop),
      _buildSecondRow(isDesktop)
    ];

    return [

      ...buildResponsiveRow(_buildFirstRow(isDesktop)),

      // Iterate over rowBuilders and wrap each in a responsive container
      ...rowBuilders.expand((row) => buildResponsiveRow(row)),

      ...buildResponsiveRow(_buildThirdRow(isDesktop)),

      // Actions row remains a Row
      Row(
        mainAxisAlignment: MainAxisAlignment.end,
        children: _handleAction(isDesktop),
      ),
    ];
  }



  List<Widget> _buildFirstRow(isDesktop) {

    return [
      Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            "Train Number",
            style: TextStyle(
                fontSize: 12,
                fontWeight: FontWeight.w600,
                color: Color(0xFF575A74)),
          ),
          SizedBox(height: 5),

          isDesktop ? Row(children: _buildTripType(isDesktop)
          ) :
          Column(
              children: _buildTripType(isDesktop)
          ),
          if (errorMessages["train_no"] != null) ...[
  SizedBox(height: 5), // Space before error message
  Text(
  "Required",
  style: TextStyle(color: Colors.red, fontSize: 12),
  ),
  ],

        ],
      ),
      if (isDesktop)
        Spacer()
      else
        SizedBox(
          height: 8,
        ),

    ];
  }



  List<Widget> _buildTripType(bool isDesktop){

    List<dynamic> purposeList = widget.apiData?['flight_trip_type'] ?? [];

    List<DropdownMenuItem<String>> dropdownItems = purposeList
        .map((item)=>DropdownMenuItem<String>(
      value: item['dropdown_value'],
      child: Text(item['dropdown_value']),
    )).toList();

    if (dropdownItems.isEmpty) {
      dropdownItems.add(
        DropdownMenuItem<String>(
          value: null,
          child: Text("No options available", style: TextStyle(color: Colors.grey)),
        ),
      );
    }

    // Default selected value
    String? selectedPurpose = dropdownItems.isNotEmpty ? dropdownItems.first.value : null;


    return [
      CustomTextFieldWrapper(
        isFocused: _trainNoFocused,
        isDesktop: isDesktop,
        child: SizedBox(
          height: 40,
          child: TextField(
            focusNode: _trainNoFocusNode,
            controller: _trainNoController,
            style: TextStyle(fontSize: 12),
            decoration: InputDecoration(
              labelText: "Train number",
              labelStyle: TextStyle(fontSize: 12, color: Colors.grey),
              floatingLabelBehavior: FloatingLabelBehavior.never,
              border: InputBorder.none,
              contentPadding: EdgeInsets.symmetric(vertical: 16),
            ),
          ),



        ),
      ),
    ];
  }


  List<Widget> _builClassType(bool isDesktop){

    List<dynamic> purposeList = widget.apiData?['train_class'] ?? [];

    List<DropdownMenuItem<String>> dropdownItems = purposeList
        .map((item)=>DropdownMenuItem<String>(
      value: item['dropdown_key'],
      child: Text(item['dropdown_value']),
    )).toList();

    if (dropdownItems.isEmpty) {
      dropdownItems.add(
        DropdownMenuItem<String>(
          value: null,
          child: Text("No options available", style: TextStyle(color: Colors.grey)),
        ),
      );
    }

    // Default selected value
     selectedClass ??= dropdownItems.isNotEmpty ? dropdownItems.first.value : null;

    return [
      Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            "Class *",
            style: TextStyle(
                fontSize: 12,
                fontWeight: FontWeight.w600,
                color: Color(0xFF575A74)),
          ),
          SizedBox(height: 5),
          CustomTextFieldWrapper(
            isFocused: _isHotelNameFocused,
            isDesktop: isDesktop,
            child: SizedBox(
              height: 40,

              child: DropdownButtonFormField<String>(
                focusNode: _hotelNameFocusNode, // Assign the correct focus node
                // controller: _hotelNameController,
                value: selectedClass,
                style: TextStyle(fontSize: 12),
                decoration: InputDecoration(
                  border: InputBorder.none,
                  contentPadding: EdgeInsets.symmetric(
                      horizontal: 10), // Proper padding
                ),
                onChanged: purposeList.isNotEmpty
                    ? (newValue) {
                  setState(() {
                    selectedClass = newValue;
                  });
                }
                    : null,
                items: dropdownItems,
              ),


            ),
          ),
  if (errorMessages["class"] != null) ...[
  SizedBox(height: 5), // Space before error message
  Text(
  "Required",
  style: TextStyle(color: Colors.red, fontSize: 12),
  ),
  ],
  ],
      ),
    ];
  }


  List<Widget> _buildSecondRow(bool isDesktop) {


    DateTime? _selectedCheckOutDate;
    TimeOfDay? _selectedCheckOutTime;

    Future<void> _selectCheckOutDate(BuildContext context) async {
      DateTime now = DateTime.now();
      DateTime today = DateTime(now.year, now.month, now.day);

      DateTime? pickedDate = await showDatePicker(
        context: context,


        initialDate: _selectedCheckOutDate != null && _selectedCheckOutDate!.isAfter(today)
            ? _selectedCheckOutDate!
            : today,
        firstDate: today,
        lastDate: DateTime(2100),
      );

      if (pickedDate != null && pickedDate != _selectedCheckOutDate) {
        setState(() {
          _selectedCheckOutDate = pickedDate;
          _dateController.text = DateFormat('yyyy-MM-dd').format(pickedDate);
        });
      }
    }

    Future<void> _selectCheckOutTime(BuildContext context) async {
      TimeOfDay? pickedTime = await showTimePicker(
        context: context,
        initialTime: _selectedCheckOutTime ?? TimeOfDay.now(),
      );

      if (pickedTime != null && pickedTime != _selectedCheckOutTime) {
        setState(() {
          _selectedCheckOutTime = pickedTime;
          // Formatting time to HH:mm (24-hour format)
          final now = DateTime.now();
          final formattedTime = DateFormat('HH:mm').format(
            DateTime(now.year, now.month, now.day, pickedTime.hour,
                pickedTime.minute),
          );
          _timeController.text = formattedTime;
        });
      }
    }

    return [

      Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            "From",
            style: TextStyle(
                fontSize: 12,
                fontWeight: FontWeight.w600,
                color: Color(0xFF575A74)),
          ),
          SizedBox(height: 5),
          CustomTextFieldItnerarySubWrapper(
            isFocused: _fromFocus,
            isDesktop: isDesktop,
            child: SizedBox(
              height: 40,
              child:  TextField(
                focusNode: _fromFocusNode,
                controller: _fromController,
                style: const TextStyle(fontSize: 12),
                decoration: const InputDecoration(
                  labelText: "From",
                  labelStyle: TextStyle(fontSize: 12, color: Colors.grey),
                  floatingLabelBehavior: FloatingLabelBehavior.never,
                  border: InputBorder.none,
                  contentPadding: EdgeInsets.symmetric(vertical: 16),

                ),
              ),
            ),
          ),
  if (errorMessages["from_station"] != null) ...[
  SizedBox(height: 5), // Space before error message
  Text(
  "Required",
  style: TextStyle(color: Colors.red, fontSize: 12),
  ),
  ],
  ],
      ),
      if (isDesktop)
        Spacer()
      else
        SizedBox(
          height: 8,
        ),
      Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            "To",
            style: TextStyle(
                fontSize: 12,
                fontWeight: FontWeight.w600,
                color: Color(0xFF575A74)),
          ),
          SizedBox(height: 5),
          CustomTextFieldItnerarySubWrapper(
            isFocused: _toFocus,
            isDesktop: isDesktop,
            child: SizedBox(
              height: 40,

              child: TextField(
                focusNode: _toFocusNode,
                controller: _toController,
                style: const TextStyle(fontSize: 12),
                decoration: const InputDecoration(
                  labelText: "To",
                  labelStyle: TextStyle(fontSize: 12, color: Colors.grey),
                  floatingLabelBehavior: FloatingLabelBehavior.never,
                  border: InputBorder.none,
                  contentPadding: EdgeInsets.symmetric(vertical: 16),
                ),
              ),
            ),
          ),
  if (errorMessages["to_station"] != null) ...[
  SizedBox(height: 5), // Space before error message
  Text(
  "Required",
  style: TextStyle(color: Colors.red, fontSize: 12),
  ),
  ],
  ],
      ),
      if (isDesktop)
        Spacer()
      else
        SizedBox(
          height: 8,
        ),
      Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            "Date",
            style: TextStyle(
                fontSize: 12,
                fontWeight: FontWeight.w600,
                color: Color(0xFF575A74)),
          ),
          SizedBox(height: 5),
          CustomTextFieldItnerarySubWrapper(
            isFocused: _dateFocus,
            isDesktop: isDesktop,
            child: SizedBox(
              height: 40,

              child: GestureDetector(
                onTap: () => _selectCheckOutDate(context),
                child: AbsorbPointer(
                  child: TextField(
                    focusNode: _dateFocusNode,
                    controller: _dateController,
                    style: const TextStyle(fontSize: 12),
                    decoration: const InputDecoration(
                      labelText: "Select Date",
                      labelStyle: TextStyle(fontSize: 12, color: Colors.grey),
                      floatingLabelBehavior: FloatingLabelBehavior.never,
                      border: InputBorder.none,
                      contentPadding: EdgeInsets.symmetric(vertical: 16),
                      suffixIcon: Icon(Icons.calendar_today,
                          size: 16, color: Colors.grey),
                    ),
                  ),
                ),
              ),

            ),
          ),
                if (errorMessages["date"] != null) ...[
  SizedBox(height: 5), // Space before error message
  Text(
  "Required",
  style: TextStyle(color: Colors.red, fontSize: 12),
  ),
  ],
                ],
      ),
      if (isDesktop)
        Spacer()
      else
        SizedBox(
          height: 8,
        ),
      Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            "Time",
            style: TextStyle(
                fontSize: 12,
                fontWeight: FontWeight.w600,
                color: Color(0xFF575A74)),
          ),
          SizedBox(height: 5),
          CustomTextFieldItnerarySubWrapper(
            isFocused: _timeFocus,
            isDesktop: isDesktop,
            child: SizedBox(
              height: 40,
              child: GestureDetector(
                onTap: () => _selectCheckOutTime(context),
                child: AbsorbPointer(
                  child: TextField(
                    focusNode: _timeFocusNode,
                    controller: _timeController,
                    style: const TextStyle(fontSize: 12),
                    decoration: const InputDecoration(
                      labelText: "Select Time",
                      labelStyle: TextStyle(fontSize: 12, color: Colors.grey),
                      floatingLabelBehavior: FloatingLabelBehavior.never,
                      border: InputBorder.none,
                      contentPadding: EdgeInsets.symmetric(vertical: 16),
                      suffixIcon:
                      Icon(Icons.access_time, size: 16, color: Colors.grey),
                    ),
                  ),
                ),
              ),

            ),
          ),
          if (errorMessages["time"] != null) ...[
            SizedBox(height: 5), // Space before error message
            Text(
              "Required",
              style: TextStyle(color: Colors.red, fontSize: 12),
            ),
          ],
        ],
      ),


    ];
  }

  List<Widget> _buildThirdRow(bool isDesktop) {
    return [
      Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            "Comments",
            style: TextStyle(
                fontSize: 12,
                fontWeight: FontWeight.w600,
                color: Color(0xFF575A74)),
          ),
          SizedBox(height: 5),
          CustomTextFieldWrapper(
            isFocused: _commentsFocus, // Dropdown doesn't use focus
            isDesktop: isDesktop,
            width: isDesktop
                ? MediaQuery.of(context).size.width * 0.4
                : MediaQuery.of(context).size.width * 0.66,
            child: TextField(
              focusNode: _commentsFocusNode,
              controller: _trainCommentsController,
              maxLines: 6,
              keyboardType: TextInputType.multiline,
              style: TextStyle(fontSize: 12),
              decoration: InputDecoration(
                labelText: "Comments",
                labelStyle: TextStyle(fontSize: 12, color: Colors.grey),
                floatingLabelBehavior: FloatingLabelBehavior.never,
                border: InputBorder.none,
                contentPadding: EdgeInsets.symmetric(vertical: 4),
              ),
            ),
          ),
        ],
      )
    ];
  }

  List<Widget> _handleAction(bool isDesktop) {
    return [
      // Close Button
      ElevatedButton(
        onPressed: () {
          widget.onClose(false);
        },
        style: ElevatedButton.styleFrom(
          backgroundColor: Colors.grey[400], // Light grey color
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(8),
          ),
          padding: EdgeInsets.symmetric(horizontal: 20, vertical: 12),
        ),
        child: Text(
          "Close",
          style: TextStyle(color: Colors.white, fontSize: 14),
        ),
      ),
      SizedBox(width: 10), // Space between buttons

      // Save Changes Button
      ElevatedButton(
        onPressed: () {
          handleSave();
        },
        style: ElevatedButton.styleFrom(
          backgroundColor: Colors.blue, // Primary color for save
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(8),
          ),
          padding: EdgeInsets.symmetric(horizontal: 20, vertical: 12),
        ),
        child: Text(
          "Save Changes",
          style: TextStyle(color: Colors.white, fontSize: 14),
        ),
      ),
    ];
  }
}