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> {

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

  Map user;
  String card = '';
  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;
  }

  @override getTextWidget() {
    return new TextField(
        keyboardType: TextInputType.number,
        decoration: new InputDecoration.collapsed(
          hintText: getHint(),
          hintStyle: new TextStyle(color: greyTextColor, fontSize: 16.0)
        ),
        controller: controller,
        onSubmitted: (String text) {
          setState(() {
            controller.text = _parseSum(text);
          });
        },
        textAlign: TextAlign.center,
        autofocus: true,
    );
  }

  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());
      });
    }
  }

  String _cleanupNumber(String text){
    String tmp = text
      .replaceAll(' ', '')
      .replaceAll('-', '')
      .replaceAll(',', '.')
      .replaceAll('..', '.');

    while(tmp.indexOf('..') != -1){
      tmp = tmp.replaceAll('..', '.');
    }
    return tmp;
  }

  _parseSum(String input) {
    num sumTotal = 0.0;
    String text = _cleanupNumber(input);

    try {
      sumTotal = num.parse(text);
    } catch(exception, stacktrace) {
      print(exception);
      try {
        int idx = text.indexOf('.');
        String integerPart = text.substring(0, idx);
        String fractionalPart = text.substring(idx + 1, text.length);
        if(fractionalPart.length > 2) {
          fractionalPart = fractionalPart.substring(0, 2);
        }
        return '${integerPart}.${fractionalPart}';
      } catch(exception, stacktrace){
        print(exception);
      }
    }
    return sumTotal.toStringAsFixed(2);
  }

  onPurchaseClick(BuildContext context) {
    String val = _parseSum(controller.text);
    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());
          });
      });
    }
  }
}