fedilab-Android-App/app/src/main/java/fr/gouv/etalab/mastodon/fragments/DisplayAccountsFragment.java

package fr.gouv.etalab.mastodon.fragments;
/* Copyright 2017 Thomas Schneider
 *
 * This file is a part of Mastodon Etalab for mastodon.etalab.gouv.fr
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the
 * GNU General Public License as published by the Free Software Foundation; either version 3 of the
 * License, or (at your option) any later version.
 *
 * Mastodon Etalab is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with Thomas Schneider; if not,
 * see <http://www.gnu.org/licenses>. */
import android.content.Context;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.widget.SwipeRefreshLayout;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

import fr.gouv.etalab.mastodon.client.Entities.Account;
import fr.gouv.etalab.mastodon.helper.Helper;
import mastodon.etalab.gouv.fr.mastodon.R;
import fr.gouv.etalab.mastodon.asynctasks.RetrieveAccountsAsyncTask;
import fr.gouv.etalab.mastodon.drawers.AccountsListAdapter;
import fr.gouv.etalab.mastodon.interfaces.OnRetrieveAccountsInterface;


/**
 * Created by Thomas on 27/04/2017.
 * Fragment to display content related to accounts
 */
public class DisplayAccountsFragment extends Fragment implements OnRetrieveAccountsInterface {


    private TextView noAction;
    private boolean flag_loading;
    private Context context;
    private AsyncTask<Void, Void, Void> asyncTask;
    private AccountsListAdapter accountsListAdapter;
    private String max_id;
    private List<Account> accounts;
    private RetrieveAccountsAsyncTask.Type type;
    private RelativeLayout mainLoader, nextElementLoader, textviewNoAction;
    private boolean firstLoad;
    private SwipeRefreshLayout swipeRefreshLayout;
    private int accountPerPage;
    private String targetedId;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_accounts, container, false);

        context = getContext();
        Bundle bundle = this.getArguments();
        if (bundle != null) {
            type = (RetrieveAccountsAsyncTask.Type) bundle.get("type");
            targetedId = bundle.getString("targetedId", null);
        }
        max_id = null;
        firstLoad = true;
        flag_loading = true;
        accounts = new ArrayList<>();

        swipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.swipeContainer);
        SharedPreferences sharedpreferences = context.getSharedPreferences(Helper.APP_PREFS, Context.MODE_PRIVATE);
        accountPerPage = sharedpreferences.getInt(Helper.SET_ACCOUNTS_PER_PAGE, 40);
        ListView lv_accounts = (ListView) rootView.findViewById(R.id.lv_accounts);

        mainLoader = (RelativeLayout) rootView.findViewById(R.id.loader);
        nextElementLoader = (RelativeLayout) rootView.findViewById(R.id.loading_next_accounts);
        textviewNoAction = (RelativeLayout) rootView.findViewById(R.id.no_action);
        mainLoader.setVisibility(View.VISIBLE);
        nextElementLoader.setVisibility(View.GONE);
        accountsListAdapter = new AccountsListAdapter(context, type, this.accounts);
        lv_accounts.setAdapter(accountsListAdapter);
        lv_accounts.setOnScrollListener(new AbsListView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {

            }
            public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {

                if(firstVisibleItem + visibleItemCount == totalItemCount ) {
                    if(!flag_loading ) {
                        flag_loading = true;
                        if( type != RetrieveAccountsAsyncTask.Type.FOLLOWERS && type != RetrieveAccountsAsyncTask.Type.FOLLOWING)
                            asyncTask = new RetrieveAccountsAsyncTask(context, type, max_id, DisplayAccountsFragment.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
                        else
                            asyncTask = new RetrieveAccountsAsyncTask(context, type, targetedId, max_id, DisplayAccountsFragment.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
                        nextElementLoader.setVisibility(View.VISIBLE);
                    }
                } else {
                    nextElementLoader.setVisibility(View.GONE);
                }
            }
        });

        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                max_id = null;
                accounts = new ArrayList<>();
                firstLoad = true;
                flag_loading = true;
                if( type != RetrieveAccountsAsyncTask.Type.FOLLOWERS && type != RetrieveAccountsAsyncTask.Type.FOLLOWING)
                    asyncTask = new RetrieveAccountsAsyncTask(context, type, max_id, DisplayAccountsFragment.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
                else
                    asyncTask = new RetrieveAccountsAsyncTask(context, type, targetedId, max_id, DisplayAccountsFragment.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
            }
        });
        swipeRefreshLayout.setColorSchemeResources(R.color.colorAccent,
                R.color.colorPrimary,
                R.color.colorPrimaryDark);


        if( type != RetrieveAccountsAsyncTask.Type.FOLLOWERS && type != RetrieveAccountsAsyncTask.Type.FOLLOWING)
            asyncTask = new RetrieveAccountsAsyncTask(context, type, max_id, DisplayAccountsFragment.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
        else
            asyncTask = new RetrieveAccountsAsyncTask(context, type, targetedId, max_id, DisplayAccountsFragment.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
        return rootView;
    }



    @Override
    public void onCreate(Bundle saveInstance)
    {
        super.onCreate(saveInstance);
    }



    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        this.context = context;
    }

    public void onStop() {
        super.onStop();
        if(asyncTask != null && asyncTask.getStatus() == AsyncTask.Status.RUNNING)
            asyncTask.cancel(true);
    }



    @Override
    public void onRetrieveAccounts(List<Account> accounts) {

        if( firstLoad && (accounts == null || accounts.size() == 0))
            textviewNoAction.setVisibility(View.VISIBLE);
        else
            textviewNoAction.setVisibility(View.GONE);
        if( accounts != null && accounts.size() > 1)
            max_id =accounts.get(accounts.size()-1).getId();
        else
            max_id = null;
        mainLoader.setVisibility(View.GONE);
        nextElementLoader.setVisibility(View.GONE);

        if( accounts != null) {
            for(Account tmpAccount: accounts){
                this.accounts.add(tmpAccount);
            }
            accountsListAdapter.notifyDataSetChanged();
        }
        swipeRefreshLayout.setRefreshing(false);
        firstLoad = false;
        if( accounts != null && accounts.size() < accountPerPage )
            flag_loading = true;
        else
            flag_loading = false;
    }
}