/*
 * Copyright 2015 Mike Penz All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.mikepenz.materialize.util;

import android.app.Activity;
import android.graphics.Rect;
import android.os.Build;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.inputmethod.InputMethodManager;

/**
 * Created by mikepenz on 14.03.15.
 * This class implements a hack to change the layout padding on bottom if the keyboard is shown
 * to allow long lists with editTextViews
 * Basic idea for this solution found here: http://stackoverflow.com/a/9108219/325479
 */
public class KeyboardUtil {
    private View decorView;
    private View contentView;
    private float initialDpDiff = -1;

    public KeyboardUtil(Activity act, View contentView) {
        this.decorView = act.getWindow().getDecorView();
        this.contentView = contentView;

        //only required on newer android versions. it was working on API level 19
        if (Build.VERSION.SDK_INT >= 19) {
            decorView.getViewTreeObserver().addOnGlobalLayoutListener(onGlobalLayoutListener);
        }
    }

    public void enable() {
        if (Build.VERSION.SDK_INT >= 19) {
            decorView.getViewTreeObserver().addOnGlobalLayoutListener(onGlobalLayoutListener);
        }
    }

    public void disable() {
        if (Build.VERSION.SDK_INT >= 19) {
            decorView.getViewTreeObserver().removeOnGlobalLayoutListener(onGlobalLayoutListener);
        }
    }


    //a small helper to allow showing the editText focus
    ViewTreeObserver.OnGlobalLayoutListener onGlobalLayoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            Rect r = new Rect();
            //r will be populated with the coordinates of your view that area still visible.
            decorView.getWindowVisibleDisplayFrame(r);

            //get the height diff as dp
            float heightDiffDp = UIUtils.convertPixelsToDp(decorView.getRootView().getHeight() - (r.bottom - r.top), decorView.getContext());

            //set the initialDpDiff at the beginning. (on my phone this was 73dp)
            if (initialDpDiff == -1) {
                initialDpDiff = heightDiffDp;
            }

            //if it could be a keyboard add the padding to the view
            if (heightDiffDp - initialDpDiff > 100) { // if more than 100 pixels, its probably a keyboard...
                //check if the padding is 0 (if yes set the padding for the keyboard)
                if (contentView.getPaddingBottom() == 0) {
                    //set the padding of the contentView for the keyboard
                    contentView.setPadding(0, 0, 0, (int) UIUtils.convertDpToPixel((heightDiffDp - initialDpDiff), decorView.getContext()));
                }
            } else {
                //check if the padding is != 0 (if yes reset the padding)
                if (contentView.getPaddingBottom() != 0) {
                    //reset the padding of the contentView
                    contentView.setPadding(0, 0, 0, 0);
                }
            }
        }
    };


    /**
     * Helper to hide the keyboard
     *
     * @param act
     */
    public static void hideKeyboard(Activity act) {
        if (act != null && act.getCurrentFocus() != null) {
            InputMethodManager inputMethodManager = (InputMethodManager) act.getSystemService(Activity.INPUT_METHOD_SERVICE);
            inputMethodManager.hideSoftInputFromWindow(act.getCurrentFocus().getWindowToken(), 0);
        }
    }
}
