fcs/lib/pages/rates/shipment_rates_calculate.dart

import 'package:fcs/domain/entities/carton.dart';
import 'package:fcs/domain/entities/cargo_type.dart';
import 'package:fcs/domain/entities/rate.dart';
import 'package:fcs/helpers/theme.dart';
import 'package:fcs/pages/rates/model/shipment_rate_model.dart';
import 'package:fcs/pages/widgets/display_text.dart';
import 'package:fcs/pages/widgets/input_text.dart';
import 'package:fcs/pages/widgets/length_picker.dart';
import 'package:fcs/pages/widgets/local_dropdown.dart';
import 'package:fcs/pages/widgets/local_text.dart';
import 'package:fcs/pages/widgets/progress.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';

class ShipmentRatesCal extends StatefulWidget {
  ShipmentRatesCal();

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

class _ShipmentRatesCalState extends State<ShipmentRatesCal> {
  bool _isLoading = false;
  late CargoType _cargoType;
  TextEditingController _widthController = new TextEditingController();
  TextEditingController _heightController = new TextEditingController();
  TextEditingController _lengthController = new TextEditingController();
  TextEditingController _actualWeightCtl = new TextEditingController();
  double _shipmentWeight = 0;
  double _amount = 0;
  double _deliveryFee = 0;

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

    //for shipment weight
    Rate rate = Provider.of<ShipmentRateModel>(context, listen: false).rate;
    _lengthController.addListener(_calShipmentWeight);
    _widthController.addListener(_calShipmentWeight);
    _heightController.addListener(_calShipmentWeight);
    _actualWeightCtl.addListener(_calShipmentWeight);
    _cargoType = rate.defaultCargoType;
    _lengthController.text = '12';
    _widthController.text = '12';
    _heightController.text = '12';
    _actualWeightCtl.text = "10.00";
    _calShipmentWeight();
  }

  _calShipmentWeight() {
    Rate rate = Provider.of<ShipmentRateModel>(context, listen: false).rate;

    double l = double.parse(_lengthController.text, (s) => 0);
    double w = double.parse(_widthController.text, (s) => 0);
    double h = double.parse(_heightController.text, (s) => 0);
    _cargoType.weight = double.tryParse(_actualWeightCtl.text) ?? 0;
    Carton box =
        Carton(cargoTypes: [_cargoType], length: l, width: w, height: h);
    var amount = box.calAmount(rate);
    var shipmentWeight = box.getShipmentWeight(rate.volumetricRatio);
    var effectiveWeight =
        _cargoType.weight! > shipmentWeight ? _cargoType.weight : shipmentWeight;

    setState(() {
      _deliveryFee =
          effectiveWeight! > rate.freeDeliveryWeight ? 0 : rate.deliveryFee;
      _amount = amount == null ? 0 : amount + _deliveryFee;
      _shipmentWeight = shipmentWeight.toDouble();
    });
  }

  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    var shipmentRateModel = Provider.of<ShipmentRateModel>(context);
    List<CargoType> cargos = shipmentRateModel.rate.cargoTypes;

    final lengthBox = LengthPicker(
      controller: _lengthController,
      lableKey: "box.length",
    );
    final widthBox = LengthPicker(
      controller: _widthController,
      lableKey: "box.width",
    );
    final heightBox = LengthPicker(
      controller: _heightController,
      lableKey: "box.height",
    );

    final dimBox = Row(
      mainAxisAlignment: MainAxisAlignment.start,
      children: [
        Padding(
          padding: const EdgeInsets.only(right: 8.0),
          child: Icon(FontAwesome.arrow_circle_right, color: primaryColor),
        ),
        SizedBox(child: lengthBox, width: 80),
        SizedBox(child: widthBox, width: 80),
        SizedBox(child: heightBox, width: 80),
      ],
    );

    final shipmentWeightBox = DisplayText(
      text: _shipmentWeight != null ? _shipmentWeight.toStringAsFixed(2) : "0",
      labelTextKey: "box.shipment_weight",
      iconData: MaterialCommunityIcons.weight,
    );

    final actualWeightBox = InputText(
      controller: _actualWeightCtl,
      labelTextKey: "box.actual_weight",
      iconData: MaterialCommunityIcons.weight,
      textInputType: TextInputType.numberWithOptions(decimal: true),
    );

    var cargoTypeBox = LocalDropdown<CargoType>(
      callback: (v) {
        setState(() {
          _cargoType = v;
          _calShipmentWeight();
        });
      },
      labelKey: "cargo.type",
      iconData: Icons.text_format,
      selectedValue: _cargoType,
      values: cargos,
    );

    return LocalProgress(
      inAsyncCall: _isLoading,
      child: Scaffold(
        appBar: AppBar(
          centerTitle: true,
          leading: new IconButton(
            icon: new Icon(CupertinoIcons.back, color: primaryColor),
            onPressed: () {
              Navigator.of(context).pop();
            },
          ),
          backgroundColor: Colors.white,
          shadowColor: Colors.transparent,
          title: LocalText(context, 'rate.cal.title',
              color: primaryColor, fontSize: 20),
        ),
        body: Padding(
          padding: const EdgeInsets.all(8.0),
          child: ListView(
            children: <Widget>[
              cargoTypeBox,
              actualWeightBox,
              dimBox,
              shipmentWeightBox,
              SizedBox(height: 50),
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  LocalText(context, "rate.delivery_fee",
                      color: primaryColor, fontSize: 16),
                  Text(
                    ':\$ ${_deliveryFee.toStringAsFixed(2)}',
                    style: TextStyle(
                      color: primaryColor,
                      fontSize: 16,
                    ),
                  )
                ],
              ),
              SizedBox(height: 20),
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  LocalText(context, "rate.total_estimated_amount",
                      color: primaryColor, fontSize: 16),
                  Text(
                    ':\$${_amount.toStringAsFixed(2)}',
                    style: TextStyle(
                      color: primaryColor,
                      fontSize: 16,
                    ),
                  )
                ],
              )
            ],
          ),
        ),
      ),
    );
  }
}