Teso_Mobile/lib/Pages/Sub_Pages/PersonalSub/Recently.dart

import 'package:teso/Classes/TesoUser.dart';
import 'package:flutter/material.dart';
import 'package:teso/Pages/PageWidgets/Recently%20Viewed/viewedItem.dart';
import 'package:teso/Classes/API Clasess/CouponDetails.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/cupertino.dart';
import 'package:provider/provider.dart';
import 'package:teso/providers/user_provider.dart';
import 'package:teso/Classes/API Clasess/Product.dart';
import 'package:teso/Classes/API Clasess/TesoBusinessDetail.dart';
import 'package:teso/Classes/API Clasess/CouponHead.dart';
import 'package:teso/Pages/Sub_Pages/Coupons/Acquire.dart';

class Recently extends StatefulWidget {
  @override
  _RecentlyState createState() => _RecentlyState();
}

class _RecentlyState extends State<Recently> {
  TesoUser currentUser;
  int _limit = 20;
  final int _limitIncrement = 20;
  List<QueryDocumentSnapshot> coupons = new List.from([]);
  final ScrollController listScrollController = ScrollController();

  @override
  void initState() {
    listScrollController.addListener(_scrollListener);
    super.initState();
  }

  _scrollListener() {
    if (listScrollController.offset >=
            listScrollController.position.maxScrollExtent &&
        !listScrollController.position.outOfRange) {
      setState(() {
        _limit += _limitIncrement;
      });
    }
    if (listScrollController.offset <=
            listScrollController.position.minScrollExtent &&
        !listScrollController.position.outOfRange) {
      setState(() {});
    }
  }

  tesoCouponDialog(context, CouponsHead head, double price) {
    showModalBottomSheet(
        context: context,
        isScrollControlled: true,
        enableDrag: true,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.vertical(top: Radius.circular(20.0)),
        ),
        builder: (BuildContext bc) {
          return AcquireCoupon(
            head: head,
            price: price,
          );
        });
  }

  @override
  Widget build(BuildContext context) {
    return Consumer<UserProvider>(
      builder: (BuildContext context, UserProvider user, Widget child) {
        if (user == null) {
          return Center(
            child: CupertinoActivityIndicator(
              animating: true,
              radius: 15,
            ),
          );
        } else {
          currentUser = user.currentUser;
          return StreamBuilder(
              stream: FirebaseFirestore.instance
                  .collection('recentlyViewed')
                  .doc("users")
                  .collection(currentUser.userGUID)
                  .orderBy('dateViewed', descending: true)
                  .limit(_limit)
                  .snapshots(),
              builder: (context, snapshot) {
                if (!snapshot.hasData) {
                  return Center(
                      child: CircularProgressIndicator(
                          valueColor: AlwaysStoppedAnimation<Color>(
                              Theme.of(context).primaryColor)));
                } else if (snapshot.data == null || coupons == null) {
                  return Center(
                      child: CircularProgressIndicator(
                          valueColor: AlwaysStoppedAnimation<Color>(
                              Theme.of(context).primaryColor)));
                } else {
                  coupons = snapshot.data.docs;
                  return ListView.builder(
                    itemCount: coupons.length,
                    controller: listScrollController,
                    itemBuilder: (context, int index) {
                      if (coupons.length <= 0) {
                        return Container();
                      } else {
                        CouponDetails couponDetails = new CouponDetails();
                        couponDetails.issuer = new TesoBusinessDetail();
                        couponDetails.targetProduct = new Product();
                        couponDetails.businessId =
                            snapshot.data.docs[index].data()['businessId'];
                        couponDetails.couponId =
                            snapshot.data.docs[index].data()['couponId'];
                        couponDetails.expiration = DateTime.parse(snapshot
                            .data.docs[index]
                            .data()['expiration']
                            .toString());
                        couponDetails.type =
                            snapshot.data.docs[index].data()['type'];
                        couponDetails.quantity = int.parse(snapshot
                            .data.docs[index]
                            .data()['quantity']
                            .toString());
                        couponDetails.worth = double.parse(snapshot
                            .data.docs[index]
                            .data()['worth']
                            .toString());
                        couponDetails.state =
                            snapshot.data.docs[index].data()['state'];
                        couponDetails.productCost = double.parse(snapshot
                            .data.docs[index]
                            .data()['unitPrice']
                            .toString());
                        couponDetails.issuer.businessAddress =
                            snapshot.data.docs[index].data()['businessAddress'];
                        couponDetails.issuer.businessContact =
                            snapshot.data.docs[index].data()['businessContact'];
                        couponDetails.issuer.businessDescription = snapshot
                            .data.docs[index]
                            .data()['businessDescription'];
                        couponDetails.issuer.businessLat =
                            snapshot.data.docs[index].data()['businessLat'];
                        couponDetails.issuer.businessLng =
                            snapshot.data.docs[index].data()['businessLng'];
                        couponDetails.issuer.businessLogo =
                            snapshot.data.docs[index].data()['businessLogo'];
                        couponDetails.issuer.businessName =
                            snapshot.data.docs[index].data()['businessName'];
                        couponDetails.targetProduct.productID =
                            snapshot.data.docs[index].data()['productId'];
                        couponDetails.targetProduct.productName =
                            snapshot.data.docs[index].data()['name'];
                        couponDetails.targetProduct.productImage =
                            snapshot.data.docs[index].data()['productImage'];
                        couponDetails.targetProduct.unitPrice = double.parse(
                            snapshot.data.docs[index]
                                .data()['unitPrice']
                                .toString());
                        couponDetails.lowerLimit = double.parse(snapshot
                            .data.docs[index]
                            .data()['lowerLimit']
                            .toString());
                        couponDetails.upperLimit = double.parse(snapshot
                            .data.docs[index]
                            .data()['upperLimit']
                            .toString());
                        return buildRecentItem(
                            context, couponDetails, tesoCouponDialog);
                      }
                    },
                  );
                }
              });
        }
      },
    );
  }
}