import 'package:flutter/material.dart';

import '../../events/eventbus.dart';
import '../../events/events.dart';
import '../../generated/l10n.dart';
import '../../models/business.dart';
import '../../models/product.dart';
import '../../models/product_attribute.dart';
import '../../store/actions.dart';
import '../../store/store.dart';
import '../../utils/util_web.dart' if (dart.library.io) '../../utils/util_io.dart';
import '../../utils/utils.dart';
import '../../widgets/general/attribute/check_options.dart';
import '../../widgets/general/attribute/qty_options.dart';
import '../../widgets/general/attribute/radio_options.dart';

class MobileAttributeSelection extends StatefulWidget {
  final Product product;
  final Business business;
  final Key key;
  final GlobalKey startKey;

  const MobileAttributeSelection({@required this.product, @required this.business, this.key, this.startKey})
    : super(key: key);

  @override
  State<StatefulWidget> createState() {
    return new MobileAttributeSelectionState();
  }

}

class MobileAttributeSelectionState extends State<MobileAttributeSelection> {
  Product product;
  int index;
  TextButton previousButton;
  TextButton nextButton;
  bool previousButtonEnable;
  bool nextButtonEnable;

  String productDesc;
  double productPrice;

  String nextText;
  String finishText;

  Map<String, dynamic> selections = new Map();

  @override
  Widget build(BuildContext context) {
    store.dispatch(UpdateContext(context));

    return Scaffold(
      appBar: AppBar(
        leading: IconButton(
          icon: Icon(Icons.arrow_back_ios),
          onPressed: () {
            Navigator.of(context).pop();
          },
        ),
        title: Text(S.of(context).select_options),
        backgroundColor: Theme.of(context).primaryColor,
        actions: [],
      ),
      body: new Column(
        mainAxisAlignment: MainAxisAlignment.start,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: <Widget>[
          _getProductContent(),
          Expanded(
            child: _getOptionsView(),
          ),
        ],
      ),
      bottomNavigationBar: new Container(
        padding: new EdgeInsets.all(10.0),
        color: new Color(0xFFA8A8A8),
        child: new Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: <Widget>[
            previousButton,
            nextButton
          ],
        ),
      ),
    );
  }

  @override
  void initState() {
    super.initState();
    setState(() {
      index = 0;
      product = widget.product;
      previousButtonEnable = false;
      nextButtonEnable = false;
      productDesc = product.description;
      productPrice = product.price;
    });

    eventBus.on<OnAttributeSelectionsChanged>().listen((event) {
      this.selections = event.selections;
      List<String> extendDescription = [];
      double extendPrice = 0.0;
      event.selections.forEach((key, value) {
        List<String> opt = [];
        for (var i = 0; i < (value as List).length; i++) {
          if (value[i]['quantity'] == 0) {
            extendPrice += value[i]['adjust_amount'];
            opt.add(value[i]['name']);
          } else {
            extendPrice += value[i]['adjust_amount'] * value[i]['quantity'];
            opt.add(value[i]['name'] + '*' + value[i]['quantity'].toString());
          }
        }
        extendDescription.add(key + ': ' + opt.join(', '));
      });

      ProductAttribute pa = product.productAttributes[index];
      if (pa.required && Utils.selectionsNotEmptyAt(selections, pa.name)) {
        setState(() {
          nextButtonEnable = true;
          productDesc = product.description + ', ' + extendDescription.join('; ');
          productPrice = product.price + extendPrice;
        });
      } else if (!pa.required){
        setState(() {
          nextButtonEnable = true;
          productDesc = product.description + ', ' + extendDescription.join('; ');
          productPrice = product.price + extendPrice;
        });
      } else {
        setState(() {
          nextButtonEnable = false;
          productDesc = product.description + ', ' + extendDescription.join('; ');
          productPrice = product.price + extendPrice;
        });
      }
    });
  }

  bool _checkCanGoNext() {
    ProductAttribute pa = product.productAttributes[index];
    if (pa.required && Utils.selectionsNotEmptyAt(selections, pa.name)) {
      return true;
    } else if (!pa.required){
      return true;
    }
    return false;
  }

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    nextText = S.of(context).next;
    finishText = S.of(context).finish;
  }

  Widget _getProductContent() {
    previousButton = TextButton(
      onPressed: previousButtonEnable ? _goPrevious : null,
      child: new Text(S.of(context).previous),
    );

    nextButton = TextButton(
      onPressed: nextButtonEnable ? _goNext : null,
      child: new Text(
          product.productAttributes.length > index + 1 ? nextText : finishText
      ),
    );

    var productContent = new SizedBox(
      child: new Row(
        mainAxisAlignment: MainAxisAlignment.start,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: <Widget>[
          new Container(
            padding: new EdgeInsets.all(10.0),
            width: 70.0,
            height: 70.0,
            child: Util.showImage(product.imagePath,
              width: 70.0,
              height: 70.0,
              fit: BoxFit.fill,
            ),
          ),
          new Expanded(
            child: new Column(
              mainAxisAlignment: MainAxisAlignment.start,
              crossAxisAlignment: CrossAxisAlignment.start,
              children: <Widget>[
                new Container(
                  padding: new EdgeInsets.all(10.0).copyWith(left: 0.0).copyWith(bottom: 0.0),
                  child: new Text(
                    product.name,
                    style: new TextStyle(
                      fontSize: 15.0,
                    ),
                    maxLines: 1,
                    overflow: TextOverflow.ellipsis,
                  ),
                ),
                new Container(
                  padding: new EdgeInsets.only(right: 10.0),
                  child: new Text(
                    productDesc,
                    style: new TextStyle(
                        fontSize: 9.0,
                        color: new Color(0xFFCDCDCD)
                    ),
                    maxLines: 4,
                    softWrap: true,
                    overflow: TextOverflow.ellipsis,
                  ),
                ),
              ],
            ),
          ),
          new Container(
            padding: new EdgeInsets.all(10.0).copyWith(left: 0.0),
            width: 70.0,
            child:
            new Text(
              productPrice.toStringAsFixed(2),
              textAlign: TextAlign.right,
              style: new TextStyle(
                fontSize: 18.0,
              ),
            ),
          ),
        ],
      ),
    );
    return productContent;
  }

  Widget _getOptionsView() {
    Widget optionsView;

    ProductAttribute productAttribute = product.productAttributes[index];
    if (productAttribute.byQuantity) {
      optionsView = new QtyOptions(product: product, index: index, selections: selections);
    } else {
      if (productAttribute.singleSelection) {
        optionsView = new RadioOptions(product: product, index: index, selections: selections);
      } else {
        optionsView = new CheckOptions(product: product, index: index, selections: selections);
      }
    }

    return optionsView;
  }

  void _goNext() {
    if (index + 1 < product.productAttributes.length) {
      setState(() {
        index = index + 1;
        previousButtonEnable = index >= 1;
        nextButtonEnable = _checkCanGoNext();
      });
    } else if (product.productAttributes.length == index + 1) {
      eventBus.fire(new OnProductWillAddToCart(product, selections, productPrice, productDesc, widget.business, buttonKey: widget.startKey));
      Navigator.pop(context);
    }
    eventBus.fire(new OnAttributePageChanged(index));
  }

  void _goPrevious() {
    if (index - 1 >= 0) {
      setState(() {
        index = index - 1;
        previousButtonEnable = index > 0;
        nextButtonEnable = _checkCanGoNext();
      });
      eventBus.fire(new OnAttributePageChanged(index));
    }
  }

  @override
  void setState(VoidCallback fn) {
    if(mounted) {
      super.setState(fn);
    }
  }
}