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/*
 * Copyright © 2014 jjYBdx4IL (https://github.com/jjYBdx4IL)
 *
 * 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.github.jjYBdx4IL.utils.windows;

import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.win32.StdCallLibrary;

import java.util.ArrayList;
import java.util.List;

//CHECKSTYLE:OFF
/**
 * From http://stackoverflow.com/questions/11067484/get-titles-of-non-java-windows-in-java
 * 
 * @author jjYBdx4IL
 */
public class EnumAllWindowNames {

    static interface User32 extends StdCallLibrary {

        User32 INSTANCE = (User32) Native.loadLibrary("user32", User32.class);

        interface WNDENUMPROC extends StdCallCallback {

            boolean callback(Pointer hWnd, Pointer arg);
        }

        boolean EnumWindows(WNDENUMPROC lpEnumFunc, Pointer userData);

        int GetWindowTextA(Pointer hWnd, byte[] lpString, int nMaxCount);

        Pointer GetWindow(Pointer hWnd, int uCmd);
    }

    public static List getAllWindowNames() {
        final List windowNames = new ArrayList();
        final User32 user32 = User32.INSTANCE;
        user32.EnumWindows(new User32.WNDENUMPROC() {

            @Override
            public boolean callback(Pointer hWnd, Pointer arg) {
                byte[] windowText = new byte[512];
                user32.GetWindowTextA(hWnd, windowText, 512);
                String wText = Native.toString(windowText).trim();
                if (!wText.isEmpty()) {
                    windowNames.add(wText);
                }
                return true;
            }
        }, null);

        return windowNames;
    }
}