checker/lib/purchase.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'dart:convert';
import 'dart:async';

import 'main.dart';
import 'base_state.dart';
import 'purchase_success.dart';

/// Экран проведения покупки.
class PurchaseScreen extends StatefulWidget {

  PurchaseScreen(this.response, this.card);

  Map response;
  String card;

  @override State createState() => new PurchaseScreenState<PurchaseScreen>(response, card);
}

class PurchaseScreenState<T> extends BaseState<PurchaseScreen> {

  PurchaseScreenState(Map user, String card) {
    this.user = user;
    this.card = card;
    getLoyality(user['loyalty_url']);
  }

  Map user;
  String card = '';
  String integerPart = '', fractionalPart = '';
  String loyality = '';

  @override Widget getScreenContent() {
    return new Container(height: 412.0,
        child: new ListView(reverse: true, children: <Widget>[
          new Column(children: <Widget>[
            getValueWithTitle('ФИО', user['first_name']),
            getValueWithTitle('Карта', card),
            getValueWithTitle('Вознаграждение', loyality),
            getHintLabel(),
            getDecoratedTextWidget(),
            buildButton(new EdgeInsets.only(top: 36.0, left: buttonVerticalMargin, right: buttonVerticalMargin), buildRaisedButton(context, 'ЗАВЕРШИТЬ ПОКУПКУ', () => onPurchaseClick(context))),
            buildButton(new EdgeInsets.only(top: 24.0, left: buttonVerticalMargin, right: buttonVerticalMargin), buildFlatButton(context, 'СКАНИРОВАТЬ', primaryColor))])
        ].reversed.toList()));
  }

  @override String getTitle() {
    return "Проведение покупки";
  }

  @override getHint() {
    return 'Сумма';
  }

  @overide getMenuButtons(BuildContext context) {
    return <Widget>[getFaqButton(), getLogoutButton()];
  }

  @override Color getTextFilledBackground() {
    return Colors.white;
  }

  /// Смена состояния экрана при изменении текста в поле ввода.
  @override handleUserInput(String tmpString) {
    setState(() {
      tmpString = tmpString.replaceAll('-', '');
      tmpString = tmpString.replaceAll(', ', '');
      print(tmpString);
      if (tmpString.contains('.')) {
        int dotIndex = tmpString.indexOf('.');
        integerPart = tmpString.substring(0, dotIndex);
        fractionalPart = tmpString.substring(dotIndex + 1, tmpString.length);
        if (fractionalPart.length > 2) {
          fractionalPart = fractionalPart.substring(0, 2);
        }
        controller.text = '${integerPart}.${fractionalPart}';
      } else {
        integerPart = tmpString;
        controller.text = tmpString;
      }
      textFieldValue = tmpString;
    });
  }

  getLoyality(String url) {

     var headers = {
        'DM-Authorization': 'dmapptoken 9fec83cdca38c357e6b65dbb17514cdd36bf2a08',
        'Authorization': 'dmtoken ${token}'
      };

      httpClient.get(url, headers: headers).then((response) {
        
        print(response.body);
        
        Map bonuses = JSON.decode(response.body);
        String type = bonuses['type'];

        setState(() {
          if (type == 'amount') {
            this.loyality = user['discount'];
          } else {
            List bonusToAmount = bonuses['bonus_to_amount'];
            this.loyality = (bonusToAmount[1].toInt() / bonusToAmount[0].toInt()  ).toString();
          }
        });

      }).catchError((error) {
        print(error.toString());
      });

  }

  _buildSum() {
    String temporaryInteger = integerPart;
    String temporaryFractional = fractionalPart;

    while (temporaryFractional.length < 2) {
      temporaryFractional = temporaryFractional + '0';
    }

    return temporaryInteger + '.' + temporaryFractional;
  }

  onPurchaseClick(BuildContext context) {
    String val = _buildSum();
    print(val);
    showDialog(context: context, child: new AlertDialog(
      title: new Text('Подтверждение'),
      content: new Text('Вы подтверждаете покупку на ${val} руб?'),
      actions: <Widget>[
        new FlatButton(
          child: new Text('Нет'),
          onPressed: () {
            Navigator.of(context).pop();
          },
        ),
        new FlatButton(
          child: new Text('Да'),
          onPressed: () {
            purchase(val);
          },
        )
      ]));
  }

  purchase(String sum_total) {

    platform.invokeMethod('getDocID').then((result) {

        String url = user['purchases_url'];

        var body = {
          'doc_id': result,
          'curr_iso_code': '643',
          'commit': 'true',
          'sum_total': sum_total 
        };

        var headers = {
          'DM-Authorization': 'dmapptoken 9fec83cdca38c357e6b65dbb17514cdd36bf2a08',
          'Authorization': 'dmtoken ${token}'
        };

        httpClient.post(url, body: body, headers: headers).then((response) {
              
          print(response.body);
          Navigator.of(context).pop();
          pushRoute(context, new PurchaseSuccessScreen(sum_total, user['first_name']));

        }).catchError((error) {
          print(error.toString());
        });
    });
  }
}