/*
 * Project:  NextGIS Mobile
 * Purpose:  Mobile GIS for Android.
 * Author:   Dmitry Baryshnikov (aka Bishop), [email protected]
 * Author:   NikitaFeodonit, [email protected]
 * Author:   Stanislav Petriakov, [email protected]
 * *****************************************************************************
 * Copyright (c) 2012-2018 NextGIS, [email protected]
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser 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 Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.nextgis.maplibui.fragment;

import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.preference.Preference;
import android.support.v7.preference.PreferenceCategory;
import android.support.v7.preference.PreferenceFragmentCompat;
import android.support.v7.preference.PreferenceGroupAdapter;
import android.support.v7.preference.PreferenceScreen;
import android.support.v7.preference.PreferenceViewHolder;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;

import com.nextgis.maplibui.R;
import com.nextgis.maplibui.activity.NGPreferenceActivity;


public abstract class NGPreferenceFragment
        extends PreferenceFragmentCompat
        implements NGPreferenceActivity.OnInvalidatePreferencesListener
{
    protected Context              mStyledContext;
    protected NGPreferenceActivity mActivity;


    protected abstract void createPreferences(PreferenceScreen screen);


    @Override
    public void onCreatePreferences(
            Bundle savedInstanceState,
            String rootKey)
    {
        mActivity = (NGPreferenceActivity) getActivity();
        mStyledContext = getPreferenceManager().getContext();

        PreferenceScreen screen = getPreferenceManager().createPreferenceScreen(mStyledContext);
        // https://groups.google.com/d/msg/android-developers/nbRw6OzWXYY/N2ckkMXmzhoJ
        // 1st setPreferenceScreen() then others
        setPreferenceScreen(screen);

        createPreferences(screen);
    }


    @Override
    public void onInvalidatePreferences()
    {
        PreferenceScreen screen = getPreferenceScreen();
        if (null != screen) {
            screen.removeAll();
            createPreferences(screen);
        }
    }

    // Thanks to https://stackoverflow.com/a/51568782
    @Override
    protected RecyclerView.Adapter onCreateAdapter(PreferenceScreen preferenceScreen) {
        return new PreferenceGroupAdapter(preferenceScreen) {
            @SuppressLint("RestrictedApi")
            @Override
            public void onBindViewHolder(PreferenceViewHolder holder, int position) {
                super.onBindViewHolder(holder, position);
                Preference preference = getItem(position);
                if (preference instanceof PreferenceCategory)
                    setZeroPaddingToLayoutChildren(holder.itemView);
                else {
                    View iconFrame = holder.itemView.findViewById(R.id.icon_frame);
                    if (iconFrame != null) {
                        iconFrame.setVisibility(preference.getIcon() == null ? View.GONE : View.VISIBLE);
                    }
                }
            }
        };
    }

    private void setZeroPaddingToLayoutChildren(View view) {
        if (!(view instanceof ViewGroup))
            return;
        ViewGroup viewGroup = (ViewGroup) view;
        int childCount = viewGroup.getChildCount();
        for (int i = 0; i < childCount; i++) {
            setZeroPaddingToLayoutChildren(viewGroup.getChildAt(i));
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1)
                viewGroup.setPaddingRelative(0, viewGroup.getPaddingTop(), viewGroup.getPaddingEnd(), viewGroup.getPaddingBottom());
            else
                viewGroup.setPadding(0, viewGroup.getPaddingTop(), viewGroup.getPaddingRight(), viewGroup.getPaddingBottom());
        }
    }
}