Teso_Mobile/lib/Pages/Sub_Pages/homeSub/HomeFeed.dart

import 'dart:convert';
import 'dart:math';
import 'package:http/http.dart' as http;
import 'package:flutter/material.dart';
import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';
import 'package:flutter/cupertino.dart';
import 'package:pull_to_refresh/pull_to_refresh.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:teso/Classes/API%20Clasess/Post.dart';
import 'package:teso/Pages/PageWidgets/Home/homeTile.dart';
import 'package:teso/Pages/Sub_Pages/homeSub/VideoList.dart';
import 'package:teso/util/consts.dart';

class HomeFeed extends StatefulWidget {
  @override
  _HomeFeedState createState() => _HomeFeedState();
}

class _HomeFeedState extends State<HomeFeed> {
  ScrollController _controller;
  // List<PostedAd> trends;
  List<Post> show;
  int count;
  var _future;
  List<Post> deadFeed;
  RefreshController _refreshController =
      RefreshController(initialRefresh: false);

  Future<List<Post>> pullAds() async {
    try {
      SharedPreferences prefs = await SharedPreferences.getInstance();
      String token = prefs.getString("tokensTeso");
      Map<String, String> requestHeaders = {
        'Content-type': 'application/json',
        'Authorization': token
      };
      var register = serverLocation + 'posts/homefeed';
      var client =
          await http.post(Uri.parse(register), headers: requestHeaders);
      if (client.statusCode == 200) {
        var posts = jsonDecode(client.body);
        setState(() {
          this.show = List<Post>.from(
              posts.map((model) => Post.fromJSON(model)).toList());
          // this.show.sort((b, a) => a.timestamp.compareTo(b.timestamp));
        });

        await prefs.setString("homefeeds", client.body);
        // await fetchImages();
        //
        return show;
      } else {
        return null;
      }
    } catch (e) {
      return null;
    }
  }

  void _scrollListener() {
    if (_controller.offset >= _controller.position.maxScrollExtent &&
        !_controller.position.outOfRange) {
      pullAds();
    }
  }

  void _onRefresh() async {
    try {
      await pullAds();
    } catch (e) {
      print(e);
    }
    _refreshController.refreshCompleted();
  }

  Future<void> watch(advert) async {
    List<Post> towatch = <Post>[];
    towatch.add(advert);
    if (show.length != 0) {
      for (int i = 0; (i < show.length) && (i < 10); i++) {
        final _random = new Random();
        towatch.add(show[_random.nextInt(show.length)]);
      }
    } else if (show.length == 0) {
      for (int i = 0; (i < deadFeed.length) && (i < 10); i++) {
        final _random = new Random();
        towatch.add(deadFeed[_random.nextInt(show.length)]);
      }
    }
    Post reported = await Navigator.of(context).push(
      new PageRouteBuilder(
        pageBuilder: (_, __, ___) => new VideoList(
          postedAd: towatch,
          //  posts: towatch,
          //  user: user,
          //friend: addable,
        ),
      ),
    );
    if (reported != null) {
      show.remove(reported);
      SharedPreferences prefs = await SharedPreferences.getInstance();
      await prefs.setString("homefeeds", jsonEncode(show));

      print(prefs.getString("homefeed"));
    }
  }

  @override
  void initState() {
    // WidgetsBinding.instance.addPostFrameCallback((_) => widget.toggle(1));
    _controller = ScrollController();
    _controller.addListener(_scrollListener);
    count = 0;
    //  pullAds();
    SharedPreferences.getInstance().then((value) {
      if (value.getString("homefeeds") != null) {
        var posts = jsonDecode(value.getString("homefeeds"));
        setState(() {
          deadFeed = List<Post>.from(
              posts.map((model) => Post.fromJSON(model)).toList());
        });
      }
    });
    _future = pullAds();
    super.initState();
  }

  @override
  void dispose() {
    _controller.dispose();
    _refreshController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: FutureBuilder(
        initialData: deadFeed,
        future: _future,
        builder: (context, snapshot) {
          if (show == null &&
              deadFeed == null &&
              (snapshot.connectionState == ConnectionState.none ||
                  snapshot.connectionState == ConnectionState.waiting)) {
            return Center(
              child: CupertinoActivityIndicator(
                animating: true,
                radius: 15,
              ),
            );
          }
          if (show == null &&
              deadFeed == null &&
              snapshot.connectionState == ConnectionState.done) {
            return SmartRefresher(
              enablePullDown: true,
              enablePullUp: false,
              header: ClassicHeader(),
              controller: _refreshController,
              onRefresh: _onRefresh,
              child: Container(
                child: Center(
                  child: Text("An error occurred"),
                ),
              ),
            );
          } else {
            show = show != null ? show : deadFeed;
            return SmartRefresher(
              enablePullDown: true,
              enablePullUp: false,
              header: ClassicHeader(),
              controller: _refreshController,
              onRefresh: _onRefresh,
              child: StaggeredGridView.count(
                controller: _controller,
                crossAxisCount: 2,
                children: List.generate(show.length, (int index) {
                  return show.elementAt(index).aspect == null ||
                          show.elementAt(index).aspect == "null"
                      ? Container()
                      : double.parse(show.elementAt(index).aspect.toString()) <
                              1
                          ? buildTile(
                              context, show.elementAt(index), 0.65, watch)
                          : buildTile(
                              context, show.elementAt(index), 0.35, watch);
                }),
                staggeredTiles: List.generate(
                  show.length,
                  (int index) {
                    return StaggeredTile.fit(1);
                  },
                ),
              ),
            );
          }
        },
      ),
    );
  }
}