/*
 * Copyright (c) 2018, Daniel Gultsch All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation and/or
 * other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package eu.siacs.conversations.ui;

import static androidx.recyclerview.widget.ItemTouchHelper.LEFT;
import static androidx.recyclerview.widget.ItemTouchHelper.RIGHT;

import android.app.Activity;
import android.app.Fragment;
import android.content.Intent;
import android.graphics.Canvas;
import android.os.Bundle;
import android.util.Log;
import android.view.ContextMenu;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.PopupMenu;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.databinding.DataBindingUtil;
import androidx.recyclerview.widget.ItemTouchHelper;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.google.android.material.dialog.MaterialAlertDialogBuilder;
import com.google.android.material.snackbar.Snackbar;
import com.google.common.base.Optional;
import com.google.common.collect.Collections2;
import eu.siacs.conversations.BuildConfig;
import eu.siacs.conversations.Config;
import eu.siacs.conversations.R;
import eu.siacs.conversations.databinding.FragmentConversationsOverviewBinding;
import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.entities.Conversation;
import eu.siacs.conversations.entities.Conversational;
import eu.siacs.conversations.services.XmppConnectionService;
import eu.siacs.conversations.services.QuickConversationsService;
import eu.siacs.conversations.ui.adapter.ConversationAdapter;
import eu.siacs.conversations.ui.interfaces.OnConversationArchived;
import eu.siacs.conversations.ui.interfaces.OnConversationSelected;
import eu.siacs.conversations.ui.util.MenuDoubleTabUtil;
import eu.siacs.conversations.ui.util.PendingActionHelper;
import eu.siacs.conversations.ui.util.PendingItem;
import eu.siacs.conversations.ui.util.ScrollState;
import eu.siacs.conversations.utils.AccountUtils;
import eu.siacs.conversations.utils.EasyOnboardingInvite;
import eu.siacs.conversations.utils.ThemeHelper;
import eu.siacs.conversations.xmpp.jingle.OngoingRtpSession;

import static androidx.recyclerview.widget.ItemTouchHelper.LEFT;
import static androidx.recyclerview.widget.ItemTouchHelper.RIGHT;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;

public class ConversationsOverviewFragment extends XmppFragment {

    private static final String STATE_SCROLL_POSITION =
            ConversationsOverviewFragment.class.getName() + ".scroll_state";

    private final List<Conversation> conversations = new ArrayList<>();
    private final PendingItem<Conversation> swipedConversation = new PendingItem<>();
    private final PendingItem<ScrollState> pendingScrollState = new PendingItem<>();
    private FragmentConversationsOverviewBinding binding;
    private ConversationAdapter conversationsAdapter;
    private XmppActivity activity;
    private final PendingActionHelper pendingActionHelper = new PendingActionHelper();

    private final ItemTouchHelper.SimpleCallback callback =
            new ItemTouchHelper.SimpleCallback(0, LEFT | RIGHT) {
                @Override
                public boolean onMove(
                        @NonNull RecyclerView recyclerView,
                        @NonNull RecyclerView.ViewHolder viewHolder,
                        @NonNull RecyclerView.ViewHolder target) {
                    return false;
                }

                @Override
                public void onChildDraw(
                        @NonNull Canvas c,
                        @NonNull RecyclerView recyclerView,
                        @NonNull RecyclerView.ViewHolder viewHolder,
                        float dX,
                        float dY,
                        int actionState,
                        boolean isCurrentlyActive) {
                    if (viewHolder
                            instanceof
                            ConversationAdapter.ConversationViewHolder conversationViewHolder) {
                        getDefaultUIUtil()
                                .onDraw(
                                        c,
                                        recyclerView,
                                        conversationViewHolder.binding.frame,
                                        dX,
                                        dY,
                                        actionState,
                                        isCurrentlyActive);
                    }
                }

                @Override
                public void clearView(
                        @NonNull RecyclerView recyclerView,
                        @NonNull RecyclerView.ViewHolder viewHolder) {
                    if (viewHolder
                            instanceof
                            ConversationAdapter.ConversationViewHolder conversationViewHolder) {
                        getDefaultUIUtil().clearView(conversationViewHolder.binding.frame);
                    }
                }

                @Override
                public float getSwipeEscapeVelocity(final float defaultEscapeVelocity) {
                    return 32 * defaultEscapeVelocity;
                }

                @Override
                public void onSwiped(
                        final RecyclerView.ViewHolder viewHolder, final int direction) {
                    pendingActionHelper.execute();
                    int position = viewHolder.getLayoutPosition();
                    try {
                        swipedConversation.push(conversations.get(position));
                    } catch (IndexOutOfBoundsException e) {
                        return;
                    }
                    conversationsAdapter.remove(swipedConversation.peek(), position);
                    activity.xmppConnectionService.markRead(swipedConversation.peek());

                    if (position == 0 && conversationsAdapter.getItemCount() == 0) {
                        final Conversation c = swipedConversation.pop();
                        activity.xmppConnectionService.archiveConversation(c);
                        return;
                    }
                    final boolean formerlySelected =
                            ConversationFragment.getConversation(getActivity())
                                    == swipedConversation.peek();
                    if (activity instanceof OnConversationArchived) {
                        ((OnConversationArchived) activity)
                                .onConversationArchived(swipedConversation.peek());
                    }
                    final Conversation c = swipedConversation.peek();
                    final int title;
                    if (c.getMode() == Conversational.MODE_MULTI) {
                        if (c.getMucOptions().isPrivateAndNonAnonymous()) {
                            title = R.string.title_undo_swipe_out_group_chat;
                        } else {
                            title = R.string.title_undo_swipe_out_channel;
                        }
                    } else {
                        title = R.string.title_undo_swipe_out_chat;
                    }

                    final Snackbar snackbar =
                            Snackbar.make(binding.list, title, 5000)
                                    .setAction(
                                            R.string.undo,
                                            v -> {
                                                pendingActionHelper.undo();
                                                Conversation conversation =
                                                        swipedConversation.pop();
                                                conversationsAdapter.insert(conversation, position);
                                                if (formerlySelected) {
                                                    if (activity
                                                            instanceof OnConversationSelected) {
                                                        ((OnConversationSelected) activity)
                                                                .onConversationSelected(c);
                                                    }
                                                }
                                                LinearLayoutManager layoutManager =
                                                        (LinearLayoutManager)
                                                                binding.list.getLayoutManager();
                                                if (position
                                                        > layoutManager
                                                                .findLastVisibleItemPosition()) {
                                                    binding.list.smoothScrollToPosition(position);
                                                }
                                            })
                                    .addCallback(
                                            new Snackbar.Callback() {
                                                @Override
                                                public void onDismissed(
                                                        Snackbar transientBottomBar, int event) {
                                                    switch (event) {
                                                        case DISMISS_EVENT_SWIPE:
                                                        case DISMISS_EVENT_TIMEOUT:
                                                            pendingActionHelper.execute();
                                                            break;
                                                    }
                                                }
                                            });

                    pendingActionHelper.push(
                            () -> {
                                if (snackbar.isShownOrQueued()) {
                                    snackbar.dismiss();
                                }
                                final Conversation conversation = swipedConversation.pop();
                                if (conversation != null) {
                                    if (!conversation.isRead(activity.xmppConnectionService)
                                            && conversation.getMode() == Conversation.MODE_SINGLE) {
                                        return;
                                    }
                                    activity.xmppConnectionService.archiveConversation(c);
                                }
                            });
                    snackbar.show();
                }
            };

    private ItemTouchHelper touchHelper;

    public static Conversation getSuggestion(Activity activity) {
        final Conversation exception;
        Fragment fragment = activity.getFragmentManager().findFragmentById(R.id.main_fragment);
        if (fragment instanceof ConversationsOverviewFragment) {
            exception = ((ConversationsOverviewFragment) fragment).swipedConversation.peek();
        } else {
            exception = null;
        }
        return getSuggestion(activity, exception);
    }

    public static Conversation getSuggestion(Activity activity, Conversation exception) {
        Fragment fragment = activity.getFragmentManager().findFragmentById(R.id.main_fragment);
        if (fragment instanceof ConversationsOverviewFragment) {
            List<Conversation> conversations =
                    ((ConversationsOverviewFragment) fragment).conversations;
            if (conversations.size() > 0) {
                Conversation suggestion = conversations.get(0);
                if (suggestion == exception) {
                    if (conversations.size() > 1) {
                        return conversations.get(1);
                    }
                } else {
                    return suggestion;
                }
            }
        }
        return null;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        if (savedInstanceState == null) {
            return;
        }
        pendingScrollState.push(savedInstanceState.getParcelable(STATE_SCROLL_POSITION));
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        if (activity instanceof XmppActivity) {
            this.activity = (XmppActivity) activity;
        } else {
            throw new IllegalStateException(
                    "Trying to attach fragment to activity that is not an XmppActivity");
        }
    }

    @Override
    public void onDestroyView() {
        Log.d(Config.LOGTAG, "ConversationsOverviewFragment.onDestroyView()");
        super.onDestroyView();
        this.binding = null;
        this.conversationsAdapter = null;
        this.touchHelper = null;
    }

    @Override
    public void onDestroy() {
        Log.d(Config.LOGTAG, "ConversationsOverviewFragment.onDestroy()");
        super.onDestroy();
    }

    @Override
    public void onPause() {
        Log.d(Config.LOGTAG, "ConversationsOverviewFragment.onPause()");
        pendingActionHelper.execute();
        super.onPause();
    }

    @Override
    public void onDetach() {
        super.onDetach();
        this.activity = null;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
    }

    @Override
    public View onCreateView(
            final LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        this.binding =
                DataBindingUtil.inflate(
                        inflater, R.layout.fragment_conversations_overview, container, false);
        this.binding.fab.setOnClickListener(
                (view) -> StartConversationActivity.launch(getActivity()));

        this.conversationsAdapter = new ConversationAdapter(this.activity, this.conversations);
        this.conversationsAdapter.setConversationClickListener(
                (view, conversation) -> {
                    if (activity instanceof OnConversationSelected) {
                        ((OnConversationSelected) activity).onConversationSelected(conversation);
                    } else {
                        Log.w(
                                ConversationsOverviewFragment.class.getCanonicalName(),
                                "Activity does not implement OnConversationSelected");
                    }
                });
        this.binding.list.setAdapter(this.conversationsAdapter);
        this.binding.list.setLayoutManager(
                new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
          registerForContextMenu(this.binding.list);
        this.binding.list.addOnScrollListener(ExtendedFabSizeChanger.of(binding.fab));
        this.touchHelper = new ItemTouchHelper(this.callback);
        this.touchHelper.attachToRecyclerView(this.binding.list);
        return binding.getRoot();
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater menuInflater) {
        menuInflater.inflate(R.menu.fragment_conversations_overview, menu);
        AccountUtils.showHideMenuItems(menu);
        final MenuItem easyOnboardInvite = menu.findItem(R.id.action_easy_invite);
        easyOnboardInvite.setVisible(EasyOnboardingInvite.anyHasSupport(activity == null ? null : activity.xmppConnectionService));
        if (activity != null && activity.xmppConnectionService != null && activity.xmppConnectionService.isOnboarding()) {
            final MenuItem manageAccounts = menu.findItem(R.id.action_accounts);
            if (manageAccounts != null) manageAccounts.setVisible(false);

            final MenuItem settings = menu.findItem(R.id.action_settings);
            if (settings != null) settings.setVisible(false);
        }
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View view, ContextMenu.ContextMenuInfo menuInfo) {
        activity.getMenuInflater().inflate(R.menu.conversations, menu);

        final MenuItem menuMucDetails = menu.findItem(R.id.action_muc_details);
        final MenuItem menuContactDetails = menu.findItem(R.id.action_contact_details);
        final MenuItem menuMute = menu.findItem(R.id.action_mute);
        final MenuItem menuUnmute = menu.findItem(R.id.action_unmute);
        final MenuItem menuOngoingCall = menu.findItem(R.id.action_ongoing_call);
        final MenuItem menuTogglePinned = menu.findItem(R.id.action_toggle_pinned);
        final MenuItem menuArchiveChat = menu.findItem(R.id.action_archive);

        if (menuInfo == null) return;
        int pos = ((AdapterContextMenuInfo) menuInfo).position;
        if (pos < 0) return;
        Conversation conversation = conversations.get(pos);
        if (conversation != null) {
            if (conversation.getMode() == Conversation.MODE_MULTI) {
                menuContactDetails.setVisible(false);
                menuMucDetails.setTitle(conversation.getMucOptions().isPrivateAndNonAnonymous() ? R.string.action_muc_details : R.string.channel_details);
                menuOngoingCall.setVisible(false);
                menuArchiveChat.setTitle("Leave " + (conversation.getMucOptions().isPrivateAndNonAnonymous() ? "group chat" : "Channel"));
            } else {
                final XmppConnectionService service = activity == null ? null : activity.xmppConnectionService;
                final Optional<OngoingRtpSession> ongoingRtpSession = service == null ? Optional.absent() : service.getJingleConnectionManager().getOngoingRtpConnection(conversation.getContact());
                if (ongoingRtpSession.isPresent()) {
                    menuOngoingCall.setVisible(true);
                } else {
                    menuOngoingCall.setVisible(false);
                }
                menuContactDetails.setVisible(!conversation.withSelf());
                menuMucDetails.setVisible(false);
                menuArchiveChat.setTitle(R.string.action_archive_chat);
            }
            if (conversation.isMuted()) {
                menuMute.setVisible(false);
            } else {
                menuUnmute.setVisible(false);
            }
            if (conversation.getBooleanAttribute(Conversation.ATTRIBUTE_PINNED_ON_TOP, false)) {
                menuTogglePinned.setTitle(R.string.remove_from_favorites);
            } else {
                menuTogglePinned.setTitle(R.string.add_to_favorites);
            }
        }
        super.onCreateContextMenu(menu, view, menuInfo);
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        final var info = ((AdapterContextMenuInfo) item.getMenuInfo());
        if (info == null) return false;

        int pos = info.position;
        if (conversations == null || conversations.size() <= pos || pos < 0) return false;

        Conversation conversation = conversations.get(pos);
        ConversationFragment fragment = new ConversationFragment();
        fragment.setHasOptionsMenu(false);
        fragment.onAttach(activity);
        fragment.reInit(conversation, null);
        boolean r = fragment.onOptionsItemSelected(item);
        refresh();
        return r;
    }

    @Override
    public void onBackendConnected() {
        refresh();
    }

    private void setupSwipe() {
        if (this.touchHelper == null && (activity.xmppConnectionService == null || !activity.xmppConnectionService.isOnboarding())) {
            this.touchHelper = new ItemTouchHelper(this.callback);
            this.touchHelper.attachToRecyclerView(this.binding.list);
        }
    }

    @Override
    public void onSaveInstanceState(Bundle bundle) {
        super.onSaveInstanceState(bundle);
        ScrollState scrollState = getScrollState();
        if (scrollState != null) {
            bundle.putParcelable(STATE_SCROLL_POSITION, scrollState);
        }
    }

    private ScrollState getScrollState() {
        if (this.binding == null) {
            return null;
        }
        LinearLayoutManager layoutManager =
                (LinearLayoutManager) this.binding.list.getLayoutManager();
        int position = layoutManager.findFirstVisibleItemPosition();
        final View view = this.binding.list.getChildAt(0);
        if (view != null) {
            return new ScrollState(position, view.getTop());
        } else {
            return new ScrollState(position, 0);
        }
    }

    @Override
    public void onStart() {
        super.onStart();
        Log.d(Config.LOGTAG, "ConversationsOverviewFragment.onStart()");
        if (activity.xmppConnectionService != null) {
            refresh();
        }
    }

    @Override
    public void onResume() {
        super.onResume();
        Log.d(Config.LOGTAG, "ConversationsOverviewFragment.onResume()");
    }

    @Override
    public boolean onOptionsItemSelected(final MenuItem item) {
        if (MenuDoubleTabUtil.shouldIgnoreTap()) {
            return false;
        }
        switch (item.getItemId()) {
            case R.id.action_search:
                startActivity(new Intent(getActivity(), SearchActivity.class));
                return true;
            case R.id.action_easy_invite:
                selectAccountToStartEasyInvite();
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private void selectAccountToStartEasyInvite() {
        final List<Account> accounts =
                EasyOnboardingInvite.getSupportingAccounts(activity.xmppConnectionService);
        if (accounts.isEmpty()) {
            // This can technically happen if opening the menu item races with accounts reconnecting
            // or something
            Toast.makeText(
                            getActivity(),
                            R.string.no_active_accounts_support_this,
                            Toast.LENGTH_LONG)
                    .show();
        } else if (accounts.size() == 1) {
            openEasyInviteScreen(accounts.get(0));
        } else {
            final AtomicReference<Account> selectedAccount = new AtomicReference<>(accounts.get(0));
            final MaterialAlertDialogBuilder alertDialogBuilder =
                    new MaterialAlertDialogBuilder(activity);
            alertDialogBuilder.setTitle(R.string.choose_account);
            final String[] asStrings =
                    Collections2.transform(accounts, a -> a.getJid().asBareJid().toString())
                            .toArray(new String[0]);
            alertDialogBuilder.setSingleChoiceItems(
                    asStrings, 0, (dialog, which) -> selectedAccount.set(accounts.get(which)));
            alertDialogBuilder.setNegativeButton(R.string.cancel, null);
            alertDialogBuilder.setPositiveButton(
                    R.string.ok, (dialog, which) -> openEasyInviteScreen(selectedAccount.get()));
            alertDialogBuilder.create().show();
        }
    }

    private void openEasyInviteScreen(final Account account) {
        EasyOnboardingInviteActivity.launch(account, activity);
    }

    @Override
    protected void refresh() {
        if (binding == null || this.activity == null) {
            Log.d(Config.LOGTAG,"ConversationsOverviewFragment.refresh() skipped updated because view binding or activity was null");
            return;
        }
        this.activity.populateWithOrderedConversations(this.conversations);
        Conversation removed = this.swipedConversation.peek();
        if (removed != null) {
            if (removed.isRead(activity == null ? null : activity.xmppConnectionService)) {
                this.conversations.remove(removed);
            } else {
                pendingActionHelper.execute();
            }
        }
        this.conversationsAdapter.notifyDataSetChanged();
        ScrollState scrollState = pendingScrollState.pop();
        if (scrollState != null) {
            setScrollPosition(scrollState);
        }

        if (activity.xmppConnectionService != null && activity.xmppConnectionService.isOnboarding()) {
            binding.fab.setVisibility(View.GONE);

            if (this.conversations.size() == 1) {
                if (activity instanceof OnConversationSelected) {
                    ((OnConversationSelected) activity).onConversationSelected(this.conversations.get(0));
                } else {
                    Log.w(ConversationsOverviewFragment.class.getCanonicalName(), "Activity does not implement OnConversationSelected");
                }
            }
        } else {
            binding.fab.setVisibility(View.VISIBLE);
        }
        setupSwipe();

        if (activity.xmppConnectionService == null || binding == null || binding.overviewSnackbar == null) return;
        binding.overviewSnackbar.setVisibility(View.GONE);
        for (final var account : activity.xmppConnectionService.getAccounts()) {
            if (activity.getPreferences().getBoolean("no_mam_pref_warn:" + account.getUuid(), false)) continue;
            if (account.mamPrefs() != null && !"always".equals(account.mamPrefs().getAttribute("default"))) {
                binding.overviewSnackbar.setVisibility(View.VISIBLE);
                binding.overviewSnackbarMessage.setText("Your account " + account.getJid().asBareJid().toString() + " does not have archiving fully enabled. This may result in missed messages if you use multiple devices or apps.");
                binding.overviewSnackbarAction.setOnClickListener((v) -> {
                    final var prefs = account.mamPrefs();
                    prefs.setAttribute("default", "always");
                    activity.xmppConnectionService.pushMamPreferences(account, prefs);
                    refresh();
                });

                binding.overviewSnackbarAction.setOnLongClickListener((v) -> {
                    PopupMenu popupMenu = new PopupMenu(getActivity(), v);
                    popupMenu.inflate(R.menu.mam_pref_fix);
                    popupMenu.setOnMenuItemClickListener(menuItem -> {
                            switch (menuItem.getItemId()) {
                            case R.id.ignore:
                                final var editor = activity.getPreferences().edit();
                                editor.putBoolean("no_mam_pref_warn:" + account.getUuid(), true).apply();
                                editor.apply();
                                refresh();
                                return true;
                            }
                            return true;
                    });
                    popupMenu.show();
                    return true;
                });
                break;
            }
        }
    }

    private void setScrollPosition(ScrollState scrollPosition) {
        if (scrollPosition != null) {
            LinearLayoutManager layoutManager =
                    (LinearLayoutManager) binding.list.getLayoutManager();
            layoutManager.scrollToPositionWithOffset(
                    scrollPosition.position, scrollPosition.offset);
        }
    }
}