HOSN-app/app/src/providers/mock-provider/mock-provider.ts

import { Injectable } from "@angular/core";
import { Storage } from "@ionic/storage";
import { Platform } from 'ionic-angular'; 
import { File } from '@ionic-native/file';
import { HttpClient } from "@angular/common/http";
import * as tweets from './tweet.json';
declare var cordova:any;

@Injectable()
export class MockProvider {
  friends;
  userId: string;
  mockTweets;
  result;
  fileRead:Boolean;

constructor(
    private storage: Storage,
    private file: File,
    public http: HttpClient,
    private platform: Platform
  ) {
    console.log('tweets are:',tweets);
    this.fileRead = false;
    this.mockTweets =  [...tweets];
    console.log(' this.mockTweets are:', this.mockTweets);

    this.storage.get("userId").then(userId => (this.userId = userId));
  }

  /**
   * Retrives the public and private tweets for a user
   * Since it is loaded in batches of 20 public tweets, public and private tweet are used as reference to load next 20 tweets
   * @param userId user id
   * @param oldestPublicTweet oldest public tweet
   * @param oldestPrivateTweet oldest private tweet
   */
  public async loadUserTimeline(
    userId,
    oldestPublicTweet?,
    oldestPrivateTweet?
  ) 
  {

  }

  /**
   * Retrieves the home feed for the logged in user
   * Since it is loaded in batches of 20 public tweets, public and private tweet are used as reference to load next 20 tweets
   * @param oldestPublicTweet oldest public tweet
   * @param oldestPrivateTweet oldest private tweet
   */
  public async loadHomeTimeline(oldestPublicTweet?, oldestPrivateTweet?) {
    console.log('hometime line called in mockprovider');
    this.readFile().then(tweets => {
        console.log('new mocktweets after replace',this.mockTweets);
      })
      .catch(err => console.error('error in readfile',err));
    return this.mockTweets;
  }

  public async replyTweet(){}

  public  writeTweet(twt:string){
    // console.log('inside writetweet',this.mockTweets[0]);
    // console.log('inside writetweet obj is:',this.mockTweets[0].full_text);
    let newTweet = Object.assign({}, this.mockTweets[0]);
    newTweet.full_text = twt;
    console.log('new tweet ',newTweet);
    this.mockTweets.push(newTweet);
    this.writefile(this.mockTweets);
  }

  public async writefile(mocktweet){
     await this.platform.ready()
     .then(_ => console.log('Device ready.'));
     //check if file exists
       this.result = this.file.writeFile(this.file.dataDirectory, 'twets.json', JSON.stringify(mocktweet), {replace: true, append:false});
       console.log("writing the file:",this.result);
       console.log('Reading the file:',this.readFile());
  }

  public async readFile() {
    var  readTweets:[];
    console.log('in readfile',this.mockTweets);
    this.file.checkFile(this.file.dataDirectory, 'twets.json')
    .then(() => {
      console.log('file exists');
                 this.file.readAsText(this.file.dataDirectory, 'twets.json')
                .then(data=>{
                  readTweets = JSON.parse(data);
                  if(!this.fileRead){
                    // readTweets.forEach(el=>this.mockTweets.push(el));
                    this.mockTweets =  [...readTweets];
                    this.fileRead = true;
                  }
                  console.log('file is: ',this.mockTweets);
                })
               .catch(err => console.error('error in reading file',err));
    })
    .catch(err => {
      console.error('File doesnt exist',err);
      this.file.writeFile(this.file.dataDirectory, 'twets.json', JSON.stringify(this.mockTweets), {replace: true});
    });
  }
     

  private async fetchPrivateTweets(privateTweetsData: object[]) {
   
  }


}