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.app.Activity;
import android.content.Context;
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.WindowManager;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AlertDialog;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentTransaction;
import androidx.recyclerview.widget.DividerItemDecoration;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;

import com.google.android.material.floatingactionbutton.FloatingActionButton;

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

import app.fedilab.fedilabtube.R;
import app.fedilab.fedilabtube.asynctasks.RetrieveAccountsAsyncTask;
import app.fedilab.fedilabtube.asynctasks.RetrieveSingleAccountAsyncTask;
import app.fedilab.fedilabtube.client.APIResponse;
import app.fedilab.fedilabtube.client.HttpsConnection;
import app.fedilab.fedilabtube.client.PeertubeAPI;
import app.fedilab.fedilabtube.client.entities.Account;
import app.fedilab.fedilabtube.client.entities.ChannelCreation;
import app.fedilab.fedilabtube.drawer.AccountsListAdapter;
import app.fedilab.fedilabtube.interfaces.OnRetrieveAccountsInterface;
import es.dmoral.toasty.Toasty;


public class DisplayAccountsFragment extends Fragment implements OnRetrieveAccountsInterface, AccountsListAdapter.AllAccountsRemoved {

    private boolean flag_loading;
    private Context context;
    private AsyncTask<Void, Void, APIResponse> asyncTask;
    private AccountsListAdapter accountsListAdapter;
    private String max_id;
    private List<Account> accounts;
    private RelativeLayout mainLoader, nextElementLoader, textviewNoAction;
    private boolean firstLoad;
    private SwipeRefreshLayout swipeRefreshLayout;
    private String name;
    private boolean swiped;
    private RecyclerView lv_accounts;
    private View rootView;
    private RetrieveAccountsAsyncTask.accountFetch accountFetch;
    private FloatingActionButton action_button;

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

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

        context = getContext();
        Bundle bundle = this.getArguments();
        accounts = new ArrayList<>();
        if (bundle != null) {
            if (bundle.containsKey("accountFetch")) {
                accountFetch = (RetrieveAccountsAsyncTask.accountFetch) bundle.getSerializable("accountFetch");
            }
            name = bundle.getString("name", null);
        }
        max_id = null;
        firstLoad = true;
        flag_loading = true;
        swiped = false;

        swipeRefreshLayout = rootView.findViewById(R.id.swipeContainer);


        if (getActivity() != null) {
            action_button = getActivity().findViewById(R.id.action_button);
            action_button.setOnClickListener(view -> {
                AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(context);
                LayoutInflater inflater1 = ((Activity) context).getLayoutInflater();
                View dialogView = inflater1.inflate(R.layout.add_channel, new LinearLayout(context), false);
                dialogBuilder.setView(dialogView);
                EditText display_name = dialogView.findViewById(R.id.display_name);
                EditText name = dialogView.findViewById(R.id.name);
                EditText description = dialogView.findViewById(R.id.description);
                dialogBuilder.setPositiveButton(R.string.validate, (dialog, id) -> {
                    if (display_name.getText() != null && display_name.getText().toString().trim().length() > 0 && name.getText() != null && name.getText().toString().trim().length() > 0) {

                        ChannelCreation channelCreation = new ChannelCreation();
                        channelCreation.setDisplayName(display_name.getText().toString().trim());
                        channelCreation.setName(name.getText().toString().trim());
                        if (description.getText() != null && description.getText().toString().trim().length() > 0) {
                            channelCreation.setDescription(description.getText().toString().trim());
                        }
                        new Thread(() -> {
                            try {
                                new PeertubeAPI(context).createChannel(channelCreation);
                                Handler mainHandler = new Handler(Looper.getMainLooper());
                                Runnable myRunnable = () -> {
                                    DisplayPlaylistsFragment displayPlaylistsFragment;
                                    if (getActivity() == null)
                                        return;
                                    displayPlaylistsFragment = (DisplayPlaylistsFragment) getActivity().getSupportFragmentManager().findFragmentByTag("CHANNELS");
                                    final FragmentTransaction ft = getActivity().getSupportFragmentManager().beginTransaction();
                                    if (displayPlaylistsFragment != null) {
                                        ft.detach(displayPlaylistsFragment);
                                        ft.attach(displayPlaylistsFragment);
                                        ft.commit();
                                    }
                                    action_button.setEnabled(true);
                                };
                                mainHandler.post(myRunnable);
                            } catch (HttpsConnection.HttpsConnectionException e) {
                                action_button.setEnabled(true);
                                e.printStackTrace();
                                Handler mainHandler = new Handler(Looper.getMainLooper());
                                Runnable myRunnable = () -> {
                                    if (e.getMessage() != null) {
                                        Toasty.error(context, e.getMessage(), Toast.LENGTH_LONG).show();
                                    } else {
                                        Toasty.error(context, context.getString(R.string.toast_error), Toast.LENGTH_LONG).show();
                                    }
                                };
                                mainHandler.post(myRunnable);
                            }
                        }).start();

                        dialog.dismiss();
                        action_button.setEnabled(false);
                    } else {
                        Toasty.error(context, context.getString(R.string.error_display_name_channel), Toast.LENGTH_LONG).show();
                    }

                });
                dialogBuilder.setNegativeButton(R.string.cancel, (dialog, id) -> dialog.dismiss());


                AlertDialog alertDialog = dialogBuilder.create();
                alertDialog.setTitle(getString(R.string.action_channel_create));
                alertDialog.setOnDismissListener(dialogInterface -> {
                    //Hide keyboard
                    InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
                    assert imm != null;
                    imm.hideSoftInputFromWindow(display_name.getWindowToken(), 0);
                });
                if (alertDialog.getWindow() != null)
                    alertDialog.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
                alertDialog.show();
            });
        }
        lv_accounts = rootView.findViewById(R.id.lv_elements);
        lv_accounts.addItemDecoration(new DividerItemDecoration(context, DividerItemDecoration.VERTICAL));
        mainLoader = rootView.findViewById(R.id.loader);
        nextElementLoader = rootView.findViewById(R.id.loading_next);
        textviewNoAction = rootView.findViewById(R.id.no_action);
        mainLoader.setVisibility(View.VISIBLE);
        nextElementLoader.setVisibility(View.GONE);
        accountsListAdapter = new AccountsListAdapter(accountFetch, this.accounts);
        accountsListAdapter.allAccountsRemoved = this;
        lv_accounts.setAdapter(accountsListAdapter);
        TextView no_action_text = rootView.findViewById(R.id.no_action_text);
        if (accountFetch == RetrieveAccountsAsyncTask.accountFetch.MUTED) {
            no_action_text.setText(context.getString(R.string.no_muted));
        }
        final LinearLayoutManager mLayoutManager;
        mLayoutManager = new LinearLayoutManager(context);
        lv_accounts.setLayoutManager(mLayoutManager);
        lv_accounts.addOnScrollListener(new RecyclerView.OnScrollListener() {
            public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
                if (dy > 0) {
                    int visibleItemCount = mLayoutManager.getChildCount();
                    int totalItemCount = mLayoutManager.getItemCount();
                    int firstVisibleItem = mLayoutManager.findFirstVisibleItemPosition();
                    if (firstVisibleItem + visibleItemCount == totalItemCount) {
                        if (!flag_loading) {
                            flag_loading = true;
                            if (accountFetch == null) {
                                asyncTask = new RetrieveSingleAccountAsyncTask(context, name, RetrieveSingleAccountAsyncTask.actionType.ACCOUNT, DisplayAccountsFragment.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
                            } else {
                                String param = accountFetch == RetrieveAccountsAsyncTask.accountFetch.CHANNEL ? name : max_id;
                                asyncTask = new RetrieveAccountsAsyncTask(context, param, accountFetch, DisplayAccountsFragment.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
                            }
                            nextElementLoader.setVisibility(View.VISIBLE);
                        }
                    } else {
                        nextElementLoader.setVisibility(View.GONE);
                    }
                }
            }
        });
        swipeRefreshLayout.setOnRefreshListener(this::pullToRefresh);

        if (accountFetch == null) {
            asyncTask = new RetrieveSingleAccountAsyncTask(context, name, RetrieveSingleAccountAsyncTask.actionType.ACCOUNT, DisplayAccountsFragment.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
        } else {
            String param = accountFetch == RetrieveAccountsAsyncTask.accountFetch.CHANNEL ? name : null;
            asyncTask = new RetrieveAccountsAsyncTask(context, param, accountFetch, DisplayAccountsFragment.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
        }
        return rootView;
    }

    @Override
    public void onResume() {
        super.onResume();
        if (accountFetch == RetrieveAccountsAsyncTask.accountFetch.CHANNEL) {
            action_button.setVisibility(View.VISIBLE);
        } else {
            action_button.setVisibility(View.GONE);
        }
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        rootView = null;
    }

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


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

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

    public void scrollToTop() {
        if (lv_accounts != null)
            lv_accounts.setAdapter(accountsListAdapter);
    }

    @Override
    public void onRetrieveAccounts(APIResponse apiResponse) {
        mainLoader.setVisibility(View.GONE);
        nextElementLoader.setVisibility(View.GONE);
        if (apiResponse.getError() != null) {
            Toasty.error(context, apiResponse.getError().getError(), Toast.LENGTH_LONG).show();
            swipeRefreshLayout.setRefreshing(false);
            swiped = false;
            flag_loading = false;
            return;
        }
        flag_loading = (apiResponse.getMax_id() == null);

        List<Account> accounts = apiResponse.getAccounts();
        if (!swiped && firstLoad && (accounts == null || accounts.size() == 0))
            textviewNoAction.setVisibility(View.VISIBLE);
        else
            textviewNoAction.setVisibility(View.GONE);

        max_id = apiResponse.getMax_id();

        if (swiped) {
            accountsListAdapter = new AccountsListAdapter(accountFetch, this.accounts);
            lv_accounts.setAdapter(accountsListAdapter);
            swiped = false;
        }
        if (accounts != null && accounts.size() > 0) {
            int currentPosition = this.accounts.size();
            this.accounts.addAll(accounts);
            accountsListAdapter.notifyItemRangeChanged(currentPosition, accounts.size());
        }
        swipeRefreshLayout.setRefreshing(false);
        firstLoad = false;
    }

    public void pullToRefresh() {
        max_id = null;
        accounts = new ArrayList<>();
        firstLoad = true;
        flag_loading = true;
        swiped = true;
        swipeRefreshLayout.setRefreshing(true);
        if (accountFetch == null) {
            asyncTask = new RetrieveSingleAccountAsyncTask(context, name, RetrieveSingleAccountAsyncTask.actionType.ACCOUNT, DisplayAccountsFragment.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
        } else {
            String param = accountFetch == RetrieveAccountsAsyncTask.accountFetch.CHANNEL ? name : null;
            asyncTask = new RetrieveAccountsAsyncTask(context, param, accountFetch, DisplayAccountsFragment.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
        }
    }

    @Override
    public void onAllAccountsRemoved() {
        textviewNoAction.setVisibility(View.VISIBLE);
    }
}