checker/lib/purchase.dart

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

import 'main.dart';
import 'common.dart';
import 'consts.dart';
import 'network.dart';
import 'base_state.dart';
import 'purchase_success.dart';

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

  PurchaseScreen(this.user, this.card);

  String user;
  String card;

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

class PurchaseScreenState<T> extends BaseState<PurchaseScreen> {

  RegExp moneyRegexp = new RegExp(r'''^(?!0\.00)\d{1,11}(\.\d{0,2})?$''');

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

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

  @override Widget getScreenContent() {
    return new Column(
      children: <Widget>[new Expanded(child: new ListView(children: <Widget>[
        getValueWithTitle('ФИО', user['first_name'] == null ? '' : 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))
      ]))]);
  }

  @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(() {

      if (tmpString.length == 0 || moneyRegexp.hasMatch(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;

      } else {
        tmpString = tmpString.substring(0, tmpString.length - 1);
        controller.text = tmpString.replaceAll('a', '');
        textFieldValue = tmpString;
      }
    });
  }

  @override getTextWidget() {
    return new TextField(keyboardType: TextInputType.text, decoration: new InputDecoration.collapsed(hintText: getHint(),
      hintStyle: new TextStyle(color: greyTextColor, fontSize: 16.0)),
      controller: controller,
      onChanged: (text) => handleUserInput(text));
  }

  getLoyality(String url) async {

    if (await platform.invokeMethod('isOnline')) {

      var headers = {
        'DM-Authorization': 'dmapptoken $appToken',
        '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 = '${user['discount']}%';
          } else {
            List amountToBonus = bonuses['amount_to_bonus'];
            double loyalityVal = (double.parse(amountToBonus[1]) / amountToBonus[0]) * 100;
            this.loyality = '${loyalityVal.toStringAsFixed(0)}%';     
          }
        });
      }).catchError((error) {
        print(error.toString());
      });
    }
  }

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

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

    if (temporaryInteger.length == 0) {
      temporaryInteger = '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) async {

    if (await platform.invokeMethod('isOnline')) {

      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 $appToken',
            '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'] == null ? '' : user['first_name']));

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