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 {
  @override State createState() => new PurchaseScreenState<PurchaseScreen>();
}

class PurchaseScreenState<T> extends BaseState<T> {

  String integerPart = '', fractionalPart = '';

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

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

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

  @override Widget getScreenContent() {
    return new Container(height: 412.0,
        child: new ListView(reverse: true, children: <Widget>[
          new Column(children: <Widget>[
            getValueWithTitle('ФИО', 'Знаменитый Рокер Паук'),
            getValueWithTitle('Карта', 'B0399900702'),
            getValueWithTitle('Вознаграждение', '100%'),
            getHintLabel(),
            getDecoratedTextWidget(),
            buildButton(new EdgeInsets.only(top: 36.0, left: buttonVerticalMargin, right: buttonVerticalMargin), buildRaisedButton(context, 'ЗАВЕРШИТЬ ПОКУПКУ', () => _purchase(context))),
            buildButton(new EdgeInsets.only(top: 24.0, left: buttonVerticalMargin, right: buttonVerticalMargin), buildFlatButton(context, 'СКАНИРОВАТЬ', primaryColor))])
        ].reversed.toList()));
  }

  @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;
    });
  }

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

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

    return temporaryInteger + '.' + temporaryFractional;
  }

  _purchase(BuildContext context) {
    String val = _buildSum();
    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: () {
            pushRoute(context, new PurchaseSuccessScreen(val));
          },
        )
      ]));
  }
}