/*
 * Copyright (c) 2010-2019 Belledonne Communications SARL.
 *
 * This file is part of linphone-android
 * (see https://www.linphone.org).
 *
 * 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.
 *
 * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
 */

package org.linphone.utils;

import android.app.Dialog;
import android.content.Context;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import androidx.recyclerview.widget.RecyclerView;
import org.linphone.R;

public class SelectableHelper {
    private final ImageView mEditButton;
    private final ImageView mSelectAllButton;
    private final ImageView mDeselectAllButton;
    private final ImageView mDeleteSelectionButton;
    private final LinearLayout mEditTopBar;
    private final LinearLayout mTopBar;
    private SelectableAdapter<RecyclerView.ViewHolder> mAdapter;
    private final DeleteListener mDeleteListener;
    private final Context mContext;
    private int mDialogDeleteMessageResourceId;

    public SelectableHelper(View view, DeleteListener listener) {
        mContext = view.getContext();
        mDeleteListener = listener;

        mEditTopBar = view.findViewById(R.id.edit_list);
        mTopBar = view.findViewById(R.id.top_bar);

        ImageView cancelButton = view.findViewById(R.id.cancel);
        cancelButton.setOnClickListener(
                new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        quitEditionMode();
                    }
                });

        mEditButton = view.findViewById(R.id.edit);
        mEditButton.setEnabled(false);

        mEditButton.setOnClickListener(
                new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        if (mAdapter.getItemCount() > 0) {
                            enterEditionMode();
                            mTopBar.setVisibility(View.GONE);
                            mEditTopBar.setVisibility(View.VISIBLE);
                        }
                    }
                });

        mSelectAllButton = view.findViewById(R.id.select_all);
        mSelectAllButton.setOnClickListener(
                new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        mAdapter.selectAll();
                    }
                });

        mDeselectAllButton = view.findViewById(R.id.deselect_all);
        mDeselectAllButton.setOnClickListener(
                new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        mAdapter.deselectAll();
                    }
                });

        mDeleteSelectionButton = view.findViewById(R.id.delete);
        mDeleteSelectionButton.setEnabled(false);

        mDeleteSelectionButton.setOnClickListener(
                new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        final Dialog dialog =
                                LinphoneUtils.getDialog(
                                        mContext,
                                        mContext.getString(mDialogDeleteMessageResourceId));
                        Button delete = dialog.findViewById(R.id.dialog_delete_button);
                        Button cancel = dialog.findViewById(R.id.dialog_cancel_button);

                        delete.setOnClickListener(
                                new View.OnClickListener() {
                                    @Override
                                    public void onClick(View view) {
                                        mDeleteListener.onDeleteSelection(getSelectedObjects());
                                        mEditButton.setEnabled(mAdapter.getItemCount() != 0);
                                        dialog.dismiss();
                                        quitEditionMode();
                                    }
                                });

                        cancel.setOnClickListener(
                                new View.OnClickListener() {
                                    @Override
                                    public void onClick(View view) {
                                        dialog.dismiss();
                                        quitEditionMode();
                                    }
                                });
                        dialog.show();
                    }
                });

        mDialogDeleteMessageResourceId = R.string.delete_text;
    }

    public void setDialogMessage(int id) {
        mDialogDeleteMessageResourceId = id;
    }

    public SelectableAdapter getAdapter() {
        return mAdapter;
    }

    public void setAdapter(SelectableAdapter adapter) {
        mAdapter = adapter;
        mEditButton.setEnabled(mAdapter.getItemCount() != 0);
    }

    public void updateSelectionButtons(boolean isSelectionEmpty, boolean isSelectionFull) {
        if (isSelectionEmpty) {
            mDeleteSelectionButton.setEnabled(false);
        } else {
            mDeleteSelectionButton.setEnabled(true);
        }

        if (isSelectionFull) {
            mSelectAllButton.setVisibility(View.GONE);
            mDeselectAllButton.setVisibility(View.VISIBLE);
        } else {
            mSelectAllButton.setVisibility(View.VISIBLE);
            mDeselectAllButton.setVisibility(View.GONE);
        }
    }

    private void quitEditionMode() {
        mAdapter.enableEdition(false);
        mTopBar.setVisibility(View.VISIBLE);
        mEditTopBar.setVisibility(View.GONE);
        mDeleteSelectionButton.setEnabled(false);
        mSelectAllButton.setVisibility(View.GONE);
        mDeselectAllButton.setVisibility(View.VISIBLE);
    }

    public void enterEditionMode() {
        mAdapter.enableEdition(true);
        mTopBar.setVisibility(View.GONE);
        mEditTopBar.setVisibility(View.VISIBLE);
        mDeleteSelectionButton.setEnabled(false);
        mSelectAllButton.setVisibility(View.VISIBLE);
        mDeselectAllButton.setVisibility(View.GONE);
    }

    private Object[] getSelectedObjects() {
        Object[] objects = new Object[mAdapter.getSelectedItemCount()];
        int index = 0;
        for (Integer i : mAdapter.getSelectedItems()) {
            objects[index] = mAdapter.getItem(i);
            index++;
        }
        return objects;
    }

    public void setEditButtonVisibility(boolean visible) {
        mEditButton.setVisibility(visible ? View.VISIBLE : View.GONE);
    }

    public interface DeleteListener {
        void onDeleteSelection(Object[] objectsToDelete);
    }
}