HOSN-app/app/src/pages/home/home.ts

import { Component } from "@angular/core";
import {
  IonicPage,
  NavController,
  MenuController,
  InfiniteScroll
} from "ionic-angular";
import { TwitterApiProvider } from "../../providers/twitter-api/twitter-api";
import { WriteTweetPage } from "../write-tweet/write-tweet";
import { P2pDatabaseGunProvider } from "../../providers/p2p-database-gun/p2p-database-gun";
import { P2pStorageIpfsProvider } from "../../providers/p2p-storage-ipfs/p2p-storage-ipfs";

@IonicPage()
@Component({
  selector: "page-home",
  templateUrl: "home.html"
})
export class HomePage {
  menuController: MenuController;
  data: any[] = [];

  constructor(
    public navCtrl: NavController,
    private twitter: TwitterApiProvider,
    private menuCtrl: MenuController,
    private gun: P2pDatabaseGunProvider,
    private ipfs: P2pStorageIpfsProvider
  ) {}

  ionViewDidLoad() {
    this.menuCtrl.enable(true, "sideNav");
  }

  ionViewDidEnter() {
    this.twitter
      .fetchHomeFeed()
      .then(
        res =>
          (this.data = this.data
            .concat(res.data)
            .sort((a, b) => this.sortByDateAsc(a, b)))
      );
    this.gun
      .getLastTweetFromUser("username")
      .then(hash => this.ipfs.fetchTweet(hash))
      .then(tweet => this.addUserObject(tweet))
      .then(
        res =>
          (this.data = this.data
            .concat(res)
            .sort((a, b) => this.sortByDateAsc(a, b)))
      );
  }

  doRefresh(refresher) {
    this.twitter.fetchHomeFeed().then(res => {
      this.data = res.data;
      console.log(res);
      refresher.complete();
    });
  }

  loadMore(infiniteScroll: InfiniteScroll) {
    this.twitter
      .fetchHomeFeedSince(this.data[this.data.length - 1].id)
      .then(res => {
        this.data = this.data
          .concat(res.data)
          .sort((a, b) => this.sortByDateAsc(a, b));
        infiniteScroll.complete();
      });
  }

  writeTweet() {
    this.navCtrl.push(WriteTweetPage);
  }

  private async addUserObject(tweet) {
    tweet.user = await this.twitter.fetchUser(tweet.user_id);
    return tweet;
  }

  private sortByDateAsc(a, b) {
    const dateA = new Date(a.created_at);
    const dateB = new Date(b.created_at);

    if (dateA > dateB) {
      return -1;
    } else if (dateA < dateB) {
      return 1;
    } else {
      return 0;
    }
  }
}