TSTU-Student-App-Android/app/src/main/java/ru/defend/defdevteam/tstu/FeedController.java

package ru.defend.defdevteam.tstu;

import android.app.Activity;
import android.widget.TextView;

/**
 * Created by thedefend on 29.11.16.
 */

public class FeedController {

    FeedReader feedReader;
    FeedUpdater feedUpdater;
    String newsFeed;
    int updateRate; //in minutes
    private WebActivity activity;

    public FeedController(WebActivity activity, int updateRate) {
        this(activity, updateRate, "http://press.tstu.ru/?format=feed");
    }

    public FeedController(WebActivity activity, int updateRate, String rssUrl) {
        feedReader = new FeedReader(this, rssUrl);
        feedUpdater = new FeedUpdater();
        this.activity = activity;
        this.updateRate = updateRate;
        feedUpdater.start();
    }

    private void startFeedReader() {
        switch (feedReader.getThreadState()) {
            case THREAD_FAIL:
                feedReader.start();
                break;
            case THREAD_NULL:
                feedReader.start();
                break;
        }
    }

    private boolean checkFeedReader() throws Exception{
        switch (feedReader.getThreadState()) {
            case THREAD_COMPLETE:
                return true;
            case THREAD_NULL:
                return false;
            default:
                throw new Exception("Failed to get rss source string from FeedReader class");
        }
    }

    public void feedUpdateAction(final String result) {
        activity.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                activity.newsTextView.setText(result);
            }
        });
    }

    private class FeedUpdater extends Thread {
        @Override
        public void run() {
            startFeedReader();
            try {
                //TODO: вернуть к норме updateRate*60*1000
                sleep(updateRate*60);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        public FeedUpdater() {
            this.start();
        }
    }

    public String getRssString() throws Exception{
        if(checkFeedReader()) {
            newsFeed = feedReader.getResult();
            return newsFeed;
        }
        throw new Exception("Feed Reader returned empty string");
    }

    interface FeedCallback{
        void Callback();
    }
}