package com.mogo.utils;

import android.app.Activity;
import android.content.Context;
import android.graphics.Rect;
import android.os.Build;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;

public class SoftKeyBoardJobber {

    public static boolean hideIfNecessary( Activity context, MotionEvent ev ) {
        if ( ev.getAction() == MotionEvent.ACTION_DOWN ) {
            View v = context.getCurrentFocus();
            if ( isShouldHideInput( v, ev ) ) {
                InputMethodManager imm = ( InputMethodManager ) context.getSystemService( Context.INPUT_METHOD_SERVICE );
                if ( imm != null ) {
                    imm.hideSoftInputFromWindow( v.getWindowToken(), 0 );
                    return true;
                }
            }
        }
        return false;
    }

    private static boolean isShouldHideInput( View v, MotionEvent event ) {
        if ( v != null && ( v instanceof EditText ) ) {
            int[] leftTop = {0, 0};
            // 获取输入框当前的location位置
            v.getLocationInWindow( leftTop );
            int left = leftTop[0];
            int top = leftTop[1];
            int bottom = top + v.getHeight();
            int right = left + v.getWidth();
            return !( event.getX() > left && event.getX() < right && event.getY() > top && event.getY() < bottom );
        }
        return false;
    }

    public static void hide( Context context, View v ) {
        InputMethodManager imm = getInputMethodManager( context );
        if ( imm != null ) {
            imm.hideSoftInputFromWindow( v.getWindowToken(), 0 );
        }
    }

    public static void show( Context context ) {
        InputMethodManager imm = getInputMethodManager( context );
        if ( imm != null ) {
            imm.toggleSoftInput( 0, InputMethodManager.HIDE_NOT_ALWAYS );
        }
    }

    private static InputMethodManager imm = null;

    private static InputMethodManager getInputMethodManager( Context context ) {
        if ( imm == null ) {
            imm = ( InputMethodManager ) context.getSystemService( Context.INPUT_METHOD_SERVICE );
        }
        return imm;
    }

    public interface OnSoftKeyboardChangeListener {
        void onSoftKeyBoardChange( int softKeyboardHeight, boolean visible );
    }

    public static ViewTreeObserver.OnGlobalLayoutListener observeSoftKeyboard( Activity activity, final OnSoftKeyboardChangeListener listener ) {
        if ( !isAliveActivity( activity ) || listener == null ) {
            return null;
        }
        final View decorView = activity.getWindow().getDecorView();
        ViewTreeObserver.OnGlobalLayoutListener onGlobalLayoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {

            int previousKeyboardHeight = -1;
            Rect rect = new Rect();
            boolean lastVisibleState = false;

            @Override
            public void onGlobalLayout() {
                rect.setEmpty();
                decorView.getWindowVisibleDisplayFrame( rect );
                int displayHeight = rect.bottom - rect.top;
                int height = decorView.getHeight() - rect.top;
                int keyboardHeight = height - displayHeight;
                if ( previousKeyboardHeight != keyboardHeight ) {
                    boolean hide = ( double ) displayHeight / height > 0.8;
                    if ( hide != lastVisibleState ) {
                        listener.onSoftKeyBoardChange( keyboardHeight, !hide );
                        lastVisibleState = hide;
                    }
                }
                previousKeyboardHeight = height;
            }
        };
        decorView.getViewTreeObserver().addOnGlobalLayoutListener( onGlobalLayoutListener );
        return onGlobalLayoutListener;
    }

    public static void removeSoftKeyboardObserver( Activity activity, ViewTreeObserver.OnGlobalLayoutListener listener ) {
        if ( !isAliveActivity( activity ) || listener == null ) {
            return;
        }
        final View decorView = activity.getWindow().getDecorView();
        if ( Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN ) {
            decorView.getViewTreeObserver().removeOnGlobalLayoutListener( listener );
        } else {
            decorView.getViewTreeObserver().removeGlobalOnLayoutListener( listener );
        }
    }

    private static boolean isAliveActivity( Activity activity ) {
        return activity != null
                && activity.getWindow() != null
                && activity.getWindow().getDecorView() != null
                && activity.getWindow().getDecorView().getViewTreeObserver() != null;
    }

}