package com.younglive.livestreaming.utils.view;

/*
 * Author: Felipe Herranz (felhr85@gmail.com)
 * Contributors:Francesco Verheye (verheye.francesco@gmail.com)
 * 		Israel Dominguez (dominguez.israel@gmail.com)
 */
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;

import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;

public class SoftKeyboard implements View.OnFocusChangeListener
{
    private static final int CLEAR_FOCUS = 0;

    private ViewGroup layout;
    private int layoutBottom;
    private InputMethodManager im;
    private int[] coords;
    private boolean isKeyboardShow;
    private SoftKeyboardChangesThread softKeyboardThread;
    private List<EditText> editTextList;

    private View tempView; // reference to a focused EditText

    public SoftKeyboard(ViewGroup layout, InputMethodManager im) {
        this.layout = layout;
        keyboardHideByDefault();
        initEditTexts(layout);
        this.im = im;
        this.coords = new int[2];
        this.isKeyboardShow = false;
        this.softKeyboardThread = new SoftKeyboardChangesThread(this);
        this.softKeyboardThread.start();
        mHandler = new InnerHandler(this);
    }


    public void openSoftKeyboard()
    {
        if(!isKeyboardShow)
        {
            layoutBottom = getLayoutCoordinates();
            im.toggleSoftInput(0, InputMethodManager.SHOW_IMPLICIT);
            softKeyboardThread.keyboardOpened();
            isKeyboardShow = true;
        }
    }

    public void closeSoftKeyboard()
    {
        if(isKeyboardShow)
        {
            im.toggleSoftInput(InputMethodManager.HIDE_IMPLICIT_ONLY, 0);
            isKeyboardShow = false;
        }
    }

    public void setSoftKeyboardCallback(SoftKeyboardChanged mCallback)
    {
        softKeyboardThread.setCallback(mCallback);
    }

    public void unRegisterSoftKeyboardCallback()
    {
        softKeyboardThread.stopThread();
    }

    public interface SoftKeyboardChanged
    {
        public void onSoftKeyboardHide();
        public void onSoftKeyboardShow();
    }

    private int getLayoutCoordinates()
    {
        layout.getLocationOnScreen(coords);
        return coords[1] + layout.getHeight();
    }

    private void keyboardHideByDefault()
    {
        layout.setFocusable(true);
        layout.setFocusableInTouchMode(true);
    }

    /*
     * InitEditTexts now handles EditTexts in nested views
     * Thanks to Francesco Verheye (verheye.francesco@gmail.com)
     */
    private void initEditTexts(ViewGroup viewgroup)
    {
        if(editTextList == null)
            editTextList = new ArrayList<>();

        int childCount = viewgroup.getChildCount();
        for(int i=0; i<= childCount-1;i++)
        {
            View v = viewgroup.getChildAt(i);

            if(v instanceof ViewGroup)
            {
                initEditTexts((ViewGroup) v);
            }

            if(v instanceof EditText)
            {
                EditText editText = (EditText) v;
                editText.setOnFocusChangeListener(this);
                editText.setCursorVisible(true);
                editTextList.add(editText);
            }
        }
    }

    /*
     * OnFocusChange does update tempView correctly now when keyboard is still shown
     * Thanks to Israel Dominguez (dominguez.israel@gmail.com)
     */
    @Override
    public void onFocusChange(View v, boolean hasFocus)
    {
        if(hasFocus)
        {
            tempView = v;
            if(!isKeyboardShow)
            {
                layoutBottom = getLayoutCoordinates();
                softKeyboardThread.keyboardOpened();
                isKeyboardShow = true;
            }
        }
    }

    // This handler will clear focus of selected EditText
    private final InnerHandler mHandler;

    private static class SoftKeyboardChangesThread extends Thread {
        WeakReference<SoftKeyboard> mSoftKeyboardWeakReference;
        private AtomicBoolean started;
        private SoftKeyboardChanged mCallback;

        public SoftKeyboardChangesThread(SoftKeyboard softKeyboard) {
            started = new AtomicBoolean(true);
            mSoftKeyboardWeakReference = new WeakReference<>(softKeyboard);
        }

        public void setCallback(SoftKeyboardChanged mCallback) {
            this.mCallback = mCallback;
        }

        @Override
        public void run() {
            while(started.get()) {
                // Wait until keyboard is requested to open
                synchronized(this) {
                    try {
                        wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }

                if (mSoftKeyboardWeakReference.get() != null &&
                        mSoftKeyboardWeakReference.get().mHandler != null) {
                    int currentBottomLocation = mSoftKeyboardWeakReference.get().getLayoutCoordinates();

                    // There is some lag between open soft-keyboard function and when it really appears.
                    while(currentBottomLocation == mSoftKeyboardWeakReference.get().layoutBottom && started.get()) {
                        currentBottomLocation = mSoftKeyboardWeakReference.get().getLayoutCoordinates();
                    }

                    if(started.get()) {
                        mCallback.onSoftKeyboardShow();
                    }

                    // When keyboard is opened from EditText, initial bottom location is greater than layoutBottom
                    // and at some moment equals layoutBottom.
                    // That broke the previous logic, so I added this new loop to handle this.
                    while(currentBottomLocation >= mSoftKeyboardWeakReference.get().layoutBottom && started.get()) {
                        currentBottomLocation = mSoftKeyboardWeakReference.get().getLayoutCoordinates();
                    }

                    // Now Keyboard is shown, keep checking layout dimensions until keyboard is gone
                    while(currentBottomLocation != mSoftKeyboardWeakReference.get().layoutBottom && started.get()) {
                        synchronized(this) {
                            try {
                                wait(500);
                            } catch (InterruptedException e) {
                                e.printStackTrace();
                            }
                        }
                        currentBottomLocation = mSoftKeyboardWeakReference.get().getLayoutCoordinates();
                    }

                    if(started.get()) {
                        mCallback.onSoftKeyboardHide();
                    }

                    // if keyboard has been opened clicking and EditText.
                    if(mSoftKeyboardWeakReference.get().isKeyboardShow && started.get()) {
                        mSoftKeyboardWeakReference.get().isKeyboardShow = false;
                    }

                    // if an EditText is focused, remove its focus (on UI thread)
                    if(started.get()) {
                        mSoftKeyboardWeakReference.get().mHandler.obtainMessage(CLEAR_FOCUS).sendToTarget();
                    }
                }
            }
        }

        public void keyboardOpened()
        {
            synchronized(this)
            {
                notify();
            }
        }

        public void stopThread()
        {
            synchronized(this)
            {
                started.set(false);
                notify();
            }
        }

    }

    private static final class InnerHandler extends Handler {

        private WeakReference<SoftKeyboard> mSoftKeyboardWeakReference;

        private InnerHandler(SoftKeyboard softKeyboard) {
            mSoftKeyboardWeakReference = new WeakReference<>(softKeyboard);
        }

        @Override
        public void handleMessage(Message m) {
            switch(m.what) {
                case CLEAR_FOCUS:
                    if(mSoftKeyboardWeakReference.get() != null &&
                            mSoftKeyboardWeakReference.get().tempView != null) {
                        mSoftKeyboardWeakReference.get().tempView.clearFocus();
                        mSoftKeyboardWeakReference.get().tempView = null;
                        mSoftKeyboardWeakReference.clear();
                    }
                    break;
            }
        }
    }
}