import 'package:fcs/helpers/theme.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_icons_null_safety/flutter_icons_null_safety.dart';
import 'package:provider/provider.dart';

import '../../domain/entities/cargo_type.dart';
import '../../domain/entities/user.dart';
import '../main/util.dart';
import '../rates/model/shipment_rate_model.dart';
import '../widgets/continue_button.dart';
import '../widgets/display_text.dart';
import '../widgets/local_title.dart';
import '../widgets/previous_button.dart';
import 'cargo_type_addition.dart';
import 'surcharge_item_addition.dart';

typedef OnPrevious = Function(
    List<CargoType> cargoTypes, List<CargoType> customDuties);
typedef OnContinue = Function(
    List<CargoType> cargoTypes, List<CargoType> customDuties);

class CargoWidget extends StatefulWidget {
  final User sender;
  final User consignee;
  final List<CargoType> cargoTypes;
  final List<CargoType> surchargeItems;
  final OnPrevious? onPrevious;
  final OnContinue? onContinue;

  const CargoWidget({
    Key? key,
    required this.cargoTypes,
    required this.surchargeItems,
    this.onPrevious,
    this.onContinue,
    required this.sender,
    required this.consignee,
  }) : super(key: key);

  @override
  State<CargoWidget> createState() => _CargoWidgetState();
}

class _CargoWidgetState extends State<CargoWidget> {
  List<CargoType> _cargoTypes = [];
  List<CargoType> _surchareItems = [];
  TextEditingController _totalCtl = TextEditingController();
  List<TextEditingController> _cargoTypeControllers = [];
  List<TextEditingController> _surchargeControllers = [];

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

  _init() {
    // for cargo types
    if (widget.cargoTypes.isNotEmpty) {
      _cargoTypes = List.from(widget.cargoTypes);
      _cargoTypes.forEach((e) {
        var editor = new TextEditingController();
        editor.text = removeTrailingZeros(e.weight);
        editor.addListener(inputChangeListener);
        _cargoTypeControllers.add(editor);
      });
      _calculateTotalWeght();
    } else {
      var model = context.read<ShipmentRateModel>();
      var cargoes = model.rate.cargoTypes.map((e) => e.clone()).toList();

      _cargoTypes = cargoes.where((e) => e.isDefault).toList();
      _cargoTypes.forEach((e) {
        var editor = new TextEditingController();
        editor.text = '';
        editor.addListener(inputChangeListener);
        _cargoTypeControllers.add(editor);
      });
    }

    //for surcharge items

    if (widget.surchargeItems.isNotEmpty) {
      _surchareItems = List.from(widget.surchargeItems);
      _surchareItems.forEach((e) {
        var editor = new TextEditingController();
        editor.text = e.qty.toString();
        editor.addListener(inputChangeListener);
        _surchargeControllers.add(editor);
      });
    }

    if (mounted) {
      setState(() {});
    }
  }

  _calculateTotalWeght() {
    double total = _cargoTypes.fold(0, (sum, value) => sum + value.weight);
    _totalCtl.text = removeTrailingZeros(total);
  }

  bool isFieldEmpty(int index) {
    return _cargoTypeControllers[index].text.isEmpty;
  }

  List<int> getEmptyFields() {
    List<int> emptyFields = [];
    for (int i = 0; i < _cargoTypeControllers.length; i++) {
      if (isFieldEmpty(i)) {
        emptyFields.add(i);
      }
    }
    return emptyFields;
  }

  inputChangeListener() {
    List<int> emptyFields = getEmptyFields();

    if (emptyFields.isEmpty) {
      _cargoTypes.asMap().entries.forEach((e) {
        _cargoTypes[e.key].weight =
            double.tryParse(_cargoTypeControllers[e.key].text) ?? 0;
      });
      double total = _cargoTypes.fold(0, (sum, value) => sum + value.weight);
      setState(() {
        _totalCtl.text = removeTrailingZeros(total);
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    final senderBox = DisplayText(
      text: widget.sender.name,
      labelTextKey: "box.sender.title",
      iconData: MaterialCommunityIcons.account_arrow_right,
      subText: Text(widget.sender.fcsID!,
          style: TextStyle(fontSize: 13, color: labelColor)),
    );

    final consigneeBox = DisplayText(
      text: widget.consignee.name,
      labelTextKey: "box.consignee.title",
      iconData: MaterialCommunityIcons.account_arrow_left,
      subText: Text(widget.consignee.fcsID!,
          style: TextStyle(fontSize: 13, color: labelColor)),
    );

    final userRow = Row(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Expanded(child: senderBox, flex: 2),
        Flexible(child: consigneeBox)
      ],
    );

    final cargoTitle = LocalTitle(
      textKey: "box.input_cargo_weight",
      topPadding: 0,
      trailing: IconButton(
          icon: Icon(
            Icons.add_circle,
            color: primaryColor,
          ),
          onPressed: () async {
            CargoType? cargoType = await Navigator.push(
                context,
                CupertinoPageRoute(
                    builder: (context) =>
                        CargoTypeAddition(cargoTypes: _cargoTypes)));
            if (cargoType == null) return;
            _cargoTypes.add(cargoType);

            _cargoTypeControllers.clear();

            _cargoTypes.forEach((e) {
              var editor = new TextEditingController();
              editor.text = removeTrailingZeros(e.weight);
              editor.addListener(inputChangeListener);
              _cargoTypeControllers.add(editor);
            });

            _calculateTotalWeght();
            if (mounted) {
              setState(() {});
            }
          }),
    );

    final cargosBox = Wrap(
        alignment: WrapAlignment.spaceBetween,
        runSpacing: 15,
        children: _cargoTypes.asMap().entries.map((e) {
          var key = e.key;
          var c = e.value;
          return SizedBox(
            width: MediaQuery.of(context).size.width / 2.3,
            child: Row(
              children: [
                InkResponse(
                    radius: 25,
                    onTap: () {
                      _cargoTypes.removeAt(key);

                      double totalWeight = double.tryParse(_totalCtl.text) ?? 0;
                      double removeWeight =
                          (double.tryParse(_cargoTypeControllers[key].text) ??
                              0);

                      if (totalWeight >= removeWeight) {
                        double result = totalWeight - removeWeight;
                        _totalCtl.text = removeTrailingZeros(result);
                      }

                      _cargoTypeControllers[key].clear();

                      if (mounted) {
                        setState(() {});
                      }
                    },
                    child: Icon(Feather.minus_circle, color: labelColor)),
                const SizedBox(width: 10),
                Flexible(
                  child: inputTextFieldWidget(context,
                      lableText: c.name ?? "",
                      controller: _cargoTypeControllers[key]),
                ),
              ],
            ),
          );
        }).toList());

    final totalWeightBox = Row(
      mainAxisAlignment: MainAxisAlignment.end,
      children: [
        SizedBox(
            width: MediaQuery.of(context).size.width / 2.3,
            child: Row(
              children: [
                InkResponse(
                    radius: 25,
                    onTap: () {
                      setState(() {
                        _totalCtl.clear();
                      });
                    },
                    child: Icon(MaterialIcons.clear, color: labelColor)),
                const SizedBox(width: 10),
                Flexible(
                  child: inputTextFieldWidget(context,
                      lableText: "Total",
                      controller: _totalCtl,
                      readOnly: getEmptyFields().isEmpty, onChanged: (neValue) {
                    List<int> emptyFields = getEmptyFields();
                    if (emptyFields.length == 1) {
                      double totalWeight = double.tryParse(neValue) ?? 0;

                      _cargoTypes.asMap().entries.forEach((e) {
                        _cargoTypes[e.key].weight = double.tryParse(
                                _cargoTypeControllers[e.key].text) ??
                            0;
                      });
                      double result = _cargoTypes.fold(
                          0, (sum, value) => sum + value.weight);

                      if (totalWeight >= result) {
                        double remaining = totalWeight - result;
                        setState(() {
                          _cargoTypeControllers[emptyFields.first].text =
                              removeTrailingZeros(remaining);
                        });
                      }
                    }
                  }),
                ),
              ],
            )),
      ],
    );

    final subchargeItemTitleBox = LocalTitle(
      textKey: "box.input_surcharge_item",
      trailing: IconButton(
          icon: Icon(
            Icons.add_circle,
            color: primaryColor,
          ),
          onPressed: () async {
            CargoType? surchargeItem = await Navigator.push(
                context,
                CupertinoPageRoute(
                    builder: (context) =>
                        SurchargeItemAddition(items: _surchareItems)));
            if (surchargeItem == null) return;

            _surchareItems.add(surchargeItem);

            _surchargeControllers.clear();
            _surchareItems.asMap().entries.forEach((e) {
              var editor = new TextEditingController();
              editor.text = e.value.qty.toString();
              _surchargeControllers.add(editor);
            });

            if (mounted) {
              setState(() {});
            }
          }),
    );

    final subChargeItemsBox = Wrap(
        alignment: WrapAlignment.spaceBetween,
        runSpacing: 15,
        children: _surchareItems.asMap().entries.map((e) {
          var key = e.key;
          var c = e.value;
          return SizedBox(
            width: MediaQuery.of(context).size.width / 2.3,
            child: Row(
              children: [
                InkResponse(
                    radius: 25,
                    onTap: () {
                      setState(() {
                        _surchareItems.removeAt(key);
                      });
                    },
                    child: Icon(Feather.minus_circle, color: labelColor)),
                const SizedBox(width: 10),
                Flexible(
                  child: inputTextFieldWidget(
                    context,
                    lableText: c.name ?? "",
                    controller: _surchargeControllers[key],
                    onChanged: (newValue) {
                      setState(() {
                        _surchareItems[key].qty = int.tryParse(newValue) ?? 0;
                      });
                    },
                  ),
                ),
              ],
            ),
          );
        }).toList());

    final continueBtn = ContinueButton(
      onTap: () {
        if (widget.onContinue != null) {
          if (_surchareItems.isNotEmpty &&
              _surchareItems.any((item) => item.qty == 0)) {
            showMsgDialog(
                context, "Error", "Please insert surcharge item quantity");
            return;
          }

          widget.onContinue!(_cargoTypes, _surchareItems);
        }
      },
    );

    final previousBtn = PreviousButton(onTap: () {
      if (widget.onPrevious != null) {
        widget.onPrevious!(_cargoTypes, _surchareItems);
      }
    });

    return Column(
      children: [
        Expanded(
          child: Padding(
            padding: EdgeInsets.only(left: 10, right: 10),
            child: ListView(
              children: [
                const SizedBox(height: 8),
                userRow,
                cargoTitle,
                cargosBox,
                const SizedBox(height: 15),
                Divider(),
                const SizedBox(height: 5),
                totalWeightBox,
                subchargeItemTitleBox,
                subChargeItemsBox,
                const SizedBox(height: 30),
              ],
            ),
          ),
        ),
        widget.onContinue != null
            ? Padding(
                padding: const EdgeInsets.only(left: 15, right: 15, top: 10),
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    previousBtn,
                    continueBtn,
                  ],
                ),
              )
            : const SizedBox(),
        const SizedBox(height: 20)
      ],
    );
  }

  Widget inputTextFieldWidget(BuildContext context,
      {required String lableText,
      TextEditingController? controller,
      Function(String)? onChanged,
      bool readOnly = false}) {
    return TextFormField(
      controller: controller,
      style: textStyle,
      cursorColor: primaryColor,
      keyboardType: TextInputType.number,
      onChanged: onChanged,
      readOnly: readOnly,
      decoration: new InputDecoration(
        contentPadding: EdgeInsets.all(0),
        labelText: lableText,
        labelStyle: newLabelStyle(color: Colors.black54, fontSize: 17),
        enabledBorder: UnderlineInputBorder(
            borderSide: BorderSide(color: primaryColor, width: 1.0)),
        focusedBorder: UnderlineInputBorder(
            borderSide: BorderSide(color: primaryColor, width: 1.0)),
        disabledBorder: UnderlineInputBorder(
            borderSide: BorderSide(color: primaryColor, width: 1.0)),
      ),
    );
  }
}