/*
 * This is the source code of Telegram for Android v. 5.x.x.
 * It is licensed under GNU GPL v. 2 or later.
 * You should have received a copy of the license in this archive (see LICENSE).
 *
 * Copyright Nikolai Kudashov, 2013-2018.
 */

package org.telegram.ui;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;

import org.telegram.messenger.AndroidUtilities;
import org.telegram.messenger.LocaleController;
import org.telegram.messenger.MessagesController;
import org.telegram.messenger.NotificationCenter;
import org.telegram.messenger.R;
import org.telegram.tgnet.ConnectionsManager;
import org.telegram.tgnet.TLRPC;
import org.telegram.ui.ActionBar.ActionBar;
import org.telegram.ui.ActionBar.BaseFragment;
import org.telegram.ui.ActionBar.Theme;
import org.telegram.ui.ActionBar.ThemeDescription;
import org.telegram.ui.Cells.LoadingCell;
import org.telegram.ui.Cells.ProfileSearchCell;
import org.telegram.ui.Cells.TextInfoPrivacyCell;
import org.telegram.ui.Components.EmptyTextProgressView;
import org.telegram.ui.Components.LayoutHelper;
import org.telegram.ui.Components.RecyclerListView;

import java.util.ArrayList;

import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

public class CommonGroupsActivity extends BaseFragment {

    private ListAdapter listViewAdapter;
    private EmptyTextProgressView emptyView;
    private RecyclerListView listView;
    private LinearLayoutManager layoutManager;

    private ArrayList<TLRPC.Chat> chats = new ArrayList<>();
    private int userId;
    private boolean loading;
    private boolean firstLoaded;
    private boolean endReached;

    public CommonGroupsActivity(int uid) {
        super();
        userId = uid;
    }

    @Override
    public boolean onFragmentCreate() {
        super.onFragmentCreate();
        getChats(0, 50);
        return true;
    }

    @Override
    public View createView(Context context) {
        actionBar.setBackButtonImage(R.drawable.ic_ab_back);
        actionBar.setAllowOverlayTitle(true);
        actionBar.setTitle(LocaleController.getString("GroupsInCommonTitle", R.string.GroupsInCommonTitle));
        actionBar.setActionBarMenuOnItemClick(new ActionBar.ActionBarMenuOnItemClick() {
            @Override
            public void onItemClick(int id) {
                if (id == -1) {
                    finishFragment();
                }
            }
        });

        fragmentView = new FrameLayout(context);
        fragmentView.setBackgroundColor(Theme.getColor(Theme.key_windowBackgroundGray));
        FrameLayout frameLayout = (FrameLayout) fragmentView;

        emptyView = new EmptyTextProgressView(context);
        emptyView.setText(LocaleController.getString("NoGroupsInCommon", R.string.NoGroupsInCommon));
        frameLayout.addView(emptyView, LayoutHelper.createFrame(LayoutHelper.MATCH_PARENT, LayoutHelper.MATCH_PARENT));

        listView = new RecyclerListView(context);
        listView.setEmptyView(emptyView);
        listView.setLayoutManager(layoutManager = new LinearLayoutManager(context, LinearLayoutManager.VERTICAL, false));
        listView.setAdapter(listViewAdapter = new ListAdapter(context));
        listView.setVerticalScrollbarPosition(LocaleController.isRTL ? RecyclerListView.SCROLLBAR_POSITION_LEFT : RecyclerListView.SCROLLBAR_POSITION_RIGHT);
        frameLayout.addView(listView, LayoutHelper.createFrame(LayoutHelper.MATCH_PARENT, LayoutHelper.MATCH_PARENT));

        listView.setOnItemClickListener((view, position) -> {
            if (position < 0 || position >= chats.size()) {
                return;
            }
            TLRPC.Chat chat = chats.get(position);
            Bundle args = new Bundle();
            args.putInt("chat_id", chat.id);
            if (!MessagesController.getInstance(currentAccount).checkCanOpenChat(args, CommonGroupsActivity.this)) {
                return;
            }
            NotificationCenter.getInstance(currentAccount).postNotificationName(NotificationCenter.closeChats);
            presentFragment(new ChatActivity(args), true);
        });
        listView.setOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                int firstVisibleItem = layoutManager.findFirstVisibleItemPosition();
                int visibleItemCount = firstVisibleItem == RecyclerView.NO_POSITION ? 0 : Math.abs(layoutManager.findLastVisibleItemPosition() - firstVisibleItem) + 1;
                if (visibleItemCount > 0) {
                    int totalItemCount = listViewAdapter.getItemCount();
                    if (!endReached && !loading && !chats.isEmpty() && firstVisibleItem + visibleItemCount >= totalItemCount - 5) {
                        getChats(chats.get(chats.size() - 1).id, 100);
                    }
                }
            }
        });

        if (loading) {
            emptyView.showProgress();
        } else {
            emptyView.showTextView();
        }
        return fragmentView;
    }

    private void getChats(int max_id, final int count) {
        if (loading) {
            return;
        }
        loading = true;
        if (emptyView != null && !firstLoaded) {
            emptyView.showProgress();
        }
        if (listViewAdapter != null) {
            listViewAdapter.notifyDataSetChanged();
        }
        TLRPC.TL_messages_getCommonChats req = new TLRPC.TL_messages_getCommonChats();
        req.user_id = MessagesController.getInstance(currentAccount).getInputUser(userId);
        if (req.user_id instanceof TLRPC.TL_inputUserEmpty) {
            return;
        }
        req.limit = count;
        req.max_id = max_id;
        int reqId = ConnectionsManager.getInstance(currentAccount).sendRequest(req, (response, error) -> AndroidUtilities.runOnUIThread(() -> {
            if (error == null) {
                TLRPC.messages_Chats res = (TLRPC.messages_Chats) response;
                MessagesController.getInstance(currentAccount).putChats(res.chats, false);
                endReached = res.chats.isEmpty() || res.chats.size() != count;
                chats.addAll(res.chats);
            } else {
                endReached = true;
            }
            loading = false;
            firstLoaded = true;
            if (emptyView != null) {
                emptyView.showTextView();
            }
            if (listViewAdapter != null) {
                listViewAdapter.notifyDataSetChanged();
            }
        }));
        ConnectionsManager.getInstance(currentAccount).bindRequestToGuid(reqId, classGuid);
    }

    @Override
    public void onResume() {
        super.onResume();
        if (listViewAdapter != null) {
            listViewAdapter.notifyDataSetChanged();
        }
    }

    private class ListAdapter extends RecyclerListView.SelectionAdapter {
        private Context mContext;

        public ListAdapter(Context context) {
            mContext = context;
        }

        @Override
        public boolean isEnabled(RecyclerView.ViewHolder holder) {
            return holder.getAdapterPosition() != chats.size();
        }

        @Override
        public int getItemCount() {
            int count = chats.size();
            if (!chats.isEmpty()) {
                count++;
                if (!endReached) {
                    count++;
                }
            }
            return count;
        }

        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view;
            switch (viewType) {
                case 0:
                    view = new ProfileSearchCell(mContext);
                    view.setBackgroundColor(Theme.getColor(Theme.key_windowBackgroundWhite));
                    break;
                case 1:
                    view = new LoadingCell(mContext);
                    view.setBackgroundColor(Theme.getColor(Theme.key_windowBackgroundWhite));
                    break;
                case 2:
                default:
                    view = new TextInfoPrivacyCell(mContext);
                    view.setBackgroundDrawable(Theme.getThemedDrawable(mContext, R.drawable.greydivider_bottom, Theme.key_windowBackgroundGrayShadow));
                    break;
            }
            return new RecyclerListView.Holder(view);
        }

        @Override
        public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
            if (holder.getItemViewType() == 0) {
                ProfileSearchCell cell = (ProfileSearchCell) holder.itemView;
                TLRPC.Chat chat = chats.get(position);
                cell.setData(chat, null, null, null, false, false);
                cell.useSeparator = position != chats.size() - 1 || !endReached;
            }
        }

        @Override
        public int getItemViewType(int i) {
            if (i < chats.size()) {
                return 0;
            } else if (!endReached && i == chats.size()) {
                return 1;
            }
            return 2;
        }
    }

    @Override
    public ThemeDescription[] getThemeDescriptions() {
        ThemeDescription.ThemeDescriptionDelegate cellDelegate = () -> {
            if (listView != null) {
                int count = listView.getChildCount();
                for (int a = 0; a < count; a++) {
                    View child = listView.getChildAt(a);
                    if (child instanceof ProfileSearchCell) {
                        ((ProfileSearchCell) child).update(0);
                    }
                }
            }
        };
        return new ThemeDescription[]{
                new ThemeDescription(listView, ThemeDescription.FLAG_CELLBACKGROUNDCOLOR, new Class[]{LoadingCell.class, ProfileSearchCell.class}, null, null, null, Theme.key_windowBackgroundWhite),
                new ThemeDescription(fragmentView, ThemeDescription.FLAG_BACKGROUND, null, null, null, null, Theme.key_windowBackgroundGray),

                new ThemeDescription(actionBar, ThemeDescription.FLAG_BACKGROUND, null, null, null, null, Theme.key_actionBarDefault),
                new ThemeDescription(listView, ThemeDescription.FLAG_LISTGLOWCOLOR, null, null, null, null, Theme.key_actionBarDefault),
                new ThemeDescription(actionBar, ThemeDescription.FLAG_AB_ITEMSCOLOR, null, null, null, null, Theme.key_actionBarDefaultIcon),
                new ThemeDescription(actionBar, ThemeDescription.FLAG_AB_TITLECOLOR, null, null, null, null, Theme.key_actionBarDefaultTitle),
                new ThemeDescription(actionBar, ThemeDescription.FLAG_AB_SELECTORCOLOR, null, null, null, null, Theme.key_actionBarDefaultSelector),

                new ThemeDescription(listView, ThemeDescription.FLAG_SELECTOR, null, null, null, null, Theme.key_listSelector),

                new ThemeDescription(listView, 0, new Class[]{View.class}, Theme.dividerPaint, null, null, Theme.key_divider),

                new ThemeDescription(emptyView, ThemeDescription.FLAG_TEXTCOLOR, null, null, null, null, Theme.key_emptyListPlaceholder),
                new ThemeDescription(emptyView, ThemeDescription.FLAG_PROGRESSBAR, null, null, null, null, Theme.key_progressCircle),

                new ThemeDescription(listView, ThemeDescription.FLAG_BACKGROUNDFILTER, new Class[]{TextInfoPrivacyCell.class}, null, null, null, Theme.key_windowBackgroundGrayShadow),
                new ThemeDescription(listView, 0, new Class[]{TextInfoPrivacyCell.class}, new String[]{"textView"}, null, null, null, Theme.key_windowBackgroundWhiteGrayText4),

                new ThemeDescription(listView, 0, new Class[]{LoadingCell.class}, new String[]{"progressBar"}, null, null, null, Theme.key_progressCircle),

                new ThemeDescription(listView, 0, new Class[]{ProfileSearchCell.class}, Theme.dialogs_namePaint, null, null, Theme.key_chats_name),
                new ThemeDescription(listView, 0, new Class[]{ProfileSearchCell.class}, null, new Drawable[]{Theme.avatar_broadcastDrawable, Theme.avatar_savedDrawable}, null, Theme.key_avatar_text),
                new ThemeDescription(null, 0, null, null, null, cellDelegate, Theme.key_avatar_backgroundRed),
                new ThemeDescription(null, 0, null, null, null, cellDelegate, Theme.key_avatar_backgroundOrange),
                new ThemeDescription(null, 0, null, null, null, cellDelegate, Theme.key_avatar_backgroundViolet),
                new ThemeDescription(null, 0, null, null, null, cellDelegate, Theme.key_avatar_backgroundGreen),
                new ThemeDescription(null, 0, null, null, null, cellDelegate, Theme.key_avatar_backgroundCyan),
                new ThemeDescription(null, 0, null, null, null, cellDelegate, Theme.key_avatar_backgroundBlue),
                new ThemeDescription(null, 0, null, null, null, cellDelegate, Theme.key_avatar_backgroundPink),
        };
    }
}