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) {
        // ignore: unnecessary_null_comparison
        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: (BuildContext context, AsyncSnapshot<QuerySnapshot> 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]['businessId'];
                        couponDetails.couponId =
                            snapshot.data!.docs[index]['couponId'];
                        couponDetails.expiration = DateTime.parse(snapshot
                            .data!.docs[index]
                            ['expiration']
                            .toString());
                        couponDetails.type =
                            snapshot.data!.docs[index]['type'];
                        couponDetails.quantity = int.parse(snapshot
                            .data!.docs[index]
                            ['quantity']
                            .toString());
                        couponDetails.worth = double.parse(snapshot
                            .data!.docs[index]
                            ['worth']
                            .toString());
                        couponDetails.state =
                            snapshot.data!.docs[index]['state'];
                        couponDetails.productCost = double.parse(snapshot
                            .data!.docs[index]
                            ['unitPrice']
                            .toString());
                        couponDetails.issuer!.businessAddress =
                            snapshot.data!.docs[index]['businessAddress'];
                        couponDetails.issuer!.businessContact =
                            snapshot.data!.docs[index]['businessContact'];
                        couponDetails.issuer!.businessDescription = snapshot
                            .data!.docs[index]
                            ['businessDescription'];
                        couponDetails.issuer!.businessLat =
                            snapshot.data!.docs[index]['businessLat'];
                        couponDetails.issuer!.businessLng =
                            snapshot.data!.docs[index]['businessLng'];
                        couponDetails.issuer!.businessLogo =
                            snapshot.data!.docs[index]['businessLogo'];
                        couponDetails.issuer!.businessName =
                            snapshot.data!.docs[index]['businessName'];
                        couponDetails.targetProduct!.productID =
                            snapshot.data!.docs[index]['productId'];
                        couponDetails.targetProduct!.productName =
                            snapshot.data!.docs[index]['name'];
                        couponDetails.targetProduct!.productImage =
                            snapshot.data!.docs[index]['productImage'];
                        couponDetails.targetProduct!.unitPrice = double.parse(
                            snapshot.data!.docs[index]
                                ['unitPrice']
                                .toString());
                        couponDetails.lowerLimit = double.parse(snapshot
                            .data!.docs[index]
                            ['lowerLimit']
                            .toString());
                        couponDetails.upperLimit = double.parse(snapshot
                            .data!.docs[index]
                            ['upperLimit']
                            .toString());
                        return buildRecentItem(
                            context, couponDetails, tesoCouponDialog);
                      }
                    },
                  );
                }
              });
        }
      },
    );
  }
}