package app.fedilab.fedilabtube.fragment;
/* Copyright 2020 Thomas Schneider
 *
 * This file is a part of TubeLab
 *
 * 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.
 *
 * TubeLab 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 TubeLab; 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.os.Handler;
import android.os.Looper;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;

import org.jetbrains.annotations.NotNull;

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

import app.fedilab.fedilabtube.R;
import app.fedilab.fedilabtube.asynctasks.RetrieveFeedsAsyncTask;
import app.fedilab.fedilabtube.asynctasks.RetrievePeertubeSearchAsyncTask;
import app.fedilab.fedilabtube.client.APIResponse;
import app.fedilab.fedilabtube.client.PeertubeAPI;
import app.fedilab.fedilabtube.client.entities.Error;
import app.fedilab.fedilabtube.client.entities.Peertube;
import app.fedilab.fedilabtube.drawer.PeertubeAdapter;
import app.fedilab.fedilabtube.helper.Helper;
import app.fedilab.fedilabtube.interfaces.OnPostActionInterface;
import app.fedilab.fedilabtube.interfaces.OnRetrieveFeedsInterface;
import es.dmoral.toasty.Toasty;

import static app.fedilab.fedilabtube.asynctasks.RetrieveFeedsAsyncTask.Type.POVERVIEW;


public class DisplayStatusFragment extends Fragment implements OnPostActionInterface, OnRetrieveFeedsInterface {


    private LinearLayoutManager mLayoutManager;
    private boolean flag_loading;
    private Context context;
    private AsyncTask<Void, Void, Void> asyncTask;
    private PeertubeAdapter peertubeAdapater;
    private String max_id;
    private List<Peertube> peertubes;
    private RetrieveFeedsAsyncTask.Type type;
    private RelativeLayout mainLoader, nextElementLoader, textviewNoAction;
    private boolean firstLoad;
    private SwipeRefreshLayout swipeRefreshLayout;
    private SharedPreferences sharedpreferences;
    private String search_peertube;
    private TextView textviewNoActionText;
    private boolean ischannel;
    private View rootView;
    private RecyclerView lv_status;
    private String targetedId;

    public DisplayStatusFragment() {
    }


    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        rootView = inflater.inflate(R.layout.fragment_video, container, false);


        peertubes = new ArrayList<>();
        context = getContext();
        Bundle bundle = this.getArguments();

        if (getArguments() != null) {
            type = DisplayStatusFragmentArgs.fromBundle(getArguments()).getType();
        }

        if (bundle != null) {
            search_peertube = bundle.getString("search_peertube", null);
            targetedId = bundle.getString("targetedid", null);
            ischannel = bundle.getBoolean("ischannel", false);
        }
        if (ischannel) {
            type = RetrieveFeedsAsyncTask.Type.CHANNEL;
        }


        lv_status = rootView.findViewById(R.id.lv_status);

        max_id = null;
        flag_loading = true;
        firstLoad = true;

        assert context != null;
        sharedpreferences = context.getSharedPreferences(Helper.APP_PREFS, Context.MODE_PRIVATE);
        swipeRefreshLayout = rootView.findViewById(R.id.swipeContainer);

        mainLoader = rootView.findViewById(R.id.loader);
        nextElementLoader = rootView.findViewById(R.id.loading_next_status);
        textviewNoAction = rootView.findViewById(R.id.no_action);
        textviewNoActionText = rootView.findViewById(R.id.no_action_text);
        mainLoader.setVisibility(View.VISIBLE);
        nextElementLoader.setVisibility(View.GONE);

        peertubeAdapater = new PeertubeAdapter(this.peertubes);
        lv_status.setAdapter(peertubeAdapater);
        mLayoutManager = new LinearLayoutManager(context);

        lv_status.setLayoutManager(mLayoutManager);


        swipeRefreshLayout.setOnRefreshListener(this::pullToRefresh);
        if (context != null) {
            //Load data depending of the value
            if (search_peertube == null) { //Not a Peertube search
                asyncTask = new RetrieveFeedsAsyncTask(context, type, "0", targetedId, DisplayStatusFragment.this).execute();
            } else {
                asyncTask = new RetrievePeertubeSearchAsyncTask(context, "0", search_peertube, DisplayStatusFragment.this).execute();
            }
        } else {
            new Handler(Looper.getMainLooper()).postDelayed(() -> {
                if (context != null) {
                    if (search_peertube == null) { //Not a Peertube search
                        asyncTask = new RetrieveFeedsAsyncTask(context, type, "0", targetedId, DisplayStatusFragment.this).execute();
                    } else {
                        asyncTask = new RetrievePeertubeSearchAsyncTask(context, "0", search_peertube, DisplayStatusFragment.this).execute();
                    }
                }
            }, 500);
        }

        if (type != POVERVIEW) {
            lv_status.addOnScrollListener(new RecyclerView.OnScrollListener() {
                public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {

                    int firstVisibleItem = mLayoutManager.findFirstVisibleItemPosition();
                    if (dy > 0) {
                        int visibleItemCount = mLayoutManager.getChildCount();
                        int totalItemCount = mLayoutManager.getItemCount();
                        if (firstVisibleItem + visibleItemCount == totalItemCount && context != null) {
                            if (!flag_loading) {
                                flag_loading = true;
                                if (search_peertube == null) { //Not a Peertube search
                                    asyncTask = new RetrieveFeedsAsyncTask(context, type, max_id, DisplayStatusFragment.this).execute();
                                } else {
                                    asyncTask = new RetrievePeertubeSearchAsyncTask(context, max_id, search_peertube, DisplayStatusFragment.this).execute();
                                }
                                nextElementLoader.setVisibility(View.VISIBLE);
                            }
                        } else {
                            nextElementLoader.setVisibility(View.GONE);
                        }
                    }
                }
            });
        }


        return rootView;
    }

    @Override
    public void onPause() {
        super.onPause();
        if (swipeRefreshLayout != null) {
            swipeRefreshLayout.setEnabled(false);
            swipeRefreshLayout.setRefreshing(false);
            swipeRefreshLayout.clearAnimation();
        }
        if (getActivity() != null) {
            InputMethodManager imm = (InputMethodManager) getActivity().getSystemService(Context.INPUT_METHOD_SERVICE);
            if (imm != null && getView() != null) {
                imm.hideSoftInputFromWindow(getView().getWindowToken(), 0);
            }
        }
    }


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


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


    @Override
    public void onStop() {
        super.onStop();
    }

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

    @Override
    public void onRetrieveFeeds(APIResponse apiResponse) {
        //hide loaders
        mainLoader.setVisibility(View.GONE);
        nextElementLoader.setVisibility(View.GONE);
        //handle other API error but discards 404 - error which can often happen due to toots which have been deleted
        if (this.peertubes == null || apiResponse == null || (apiResponse.getError() != null && apiResponse.getError().getStatusCode() != 404 && apiResponse.getError().getStatusCode() != 501)) {
            if (apiResponse == null)
                Toasty.error(context, context.getString(R.string.toast_error), Toast.LENGTH_LONG).show();
            else {
                Toasty.error(context, apiResponse.getError().getError(), Toast.LENGTH_LONG).show();
            }
            swipeRefreshLayout.setRefreshing(false);
            flag_loading = false;
            return;
        }
        int previousPosition = this.peertubes.size();
        if (max_id == null)
            max_id = "0";
        //max_id needs to work like an offset
        int tootPerPage = sharedpreferences.getInt(Helper.SET_VIDEOS_PER_PAGE, Helper.VIDEOS_PER_PAGE);
        max_id = String.valueOf(Integer.parseInt(max_id) + tootPerPage);
        if (apiResponse.getPeertubes() == null) {
            return;
        }
        this.peertubes.addAll(apiResponse.getPeertubes());
        //If no item were inserted previously the adapter is created
        if (previousPosition == 0) {
            peertubeAdapater = new PeertubeAdapter(this.peertubes);
            lv_status.setAdapter(peertubeAdapater);
        } else
            peertubeAdapater.notifyItemRangeInserted(previousPosition, apiResponse.getPeertubes().size());
        //remove handlers
        swipeRefreshLayout.setRefreshing(false);
        textviewNoAction.setVisibility(View.GONE);
        if (firstLoad && (apiResponse.getPeertubes() == null || apiResponse.getPeertubes().size() == 0)) {
            textviewNoActionText.setText(R.string.no_video_to_display);
            textviewNoAction.setVisibility(View.VISIBLE);
        }
        flag_loading = false;
        firstLoad = false;
    }


    @Override
    public void onDestroyView() {
        if (lv_status != null) {
            try {
                lv_status.setAdapter(null);
            } catch (Exception ignored) {
            }
        }
        super.onDestroyView();
        rootView = null;
    }

    @Override
    public void onResume() {
        super.onResume();
        swipeRefreshLayout.setEnabled(true);
    }


    public void scrollToTop() {
        if (mLayoutManager != null) {
            mLayoutManager.scrollToPositionWithOffset(0, 0);
        }
    }


    public void pullToRefresh() {
        if (peertubes.size() > 0) {
            int size = peertubes.size();
            peertubes.clear();
            peertubes = new ArrayList<>();
            max_id = "0";
            peertubeAdapater.notifyItemRangeRemoved(0, size);
            if (search_peertube == null) { //Not a Peertube search
                asyncTask = new RetrieveFeedsAsyncTask(context, type, "0", targetedId, DisplayStatusFragment.this).execute();
            } else {
                asyncTask = new RetrievePeertubeSearchAsyncTask(context, "0", search_peertube, DisplayStatusFragment.this).execute();
            }
        }
    }


    @Override
    public void onPostAction(int statusCode, PeertubeAPI.StatusAction statusAction, String userId, Error error) {

    }
}