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/* Copyright (c) 2010, 2013 Daniel Doubrovkine, Markus Karg, All Rights Reserved
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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 General Public License for more details.  
 */
package com.sun.jna.platform.win32;

import com.sun.jna.Native;
import com.sun.jna.platform.win32.Guid.GUID;
import com.sun.jna.platform.win32.WinDef.DWORD;
import com.sun.jna.platform.win32.WinDef.HWND;
import com.sun.jna.platform.win32.WinDef.LPVOID;
import com.sun.jna.platform.win32.WinNT.HANDLE;
import com.sun.jna.platform.win32.WinNT.HRESULT;
import com.sun.jna.ptr.PointerByReference;

/**
 * Shell32 Utility API.
 * @author dblock[at]dblock.org
 * @author markus[at]headcrashing[dot]eu
 */
public abstract class Shell32Util {
	
	/**
	 * Get a special folder path.
	 * @param hwnd
	 *  Parent window.
	 * @param nFolder
	 *  Folder CSLID.
	 * @param dwFlags
	 *  Flags.
	 * @return
	 *  Special folder.
	 */
	public static String getFolderPath(HWND hwnd, int nFolder, DWORD dwFlags) {
    	char[] pszPath = new char[WinDef.MAX_PATH];
    	HRESULT hr = Shell32.INSTANCE.SHGetFolderPath(hwnd, 
    			nFolder, null, dwFlags, 
    			pszPath);
    	if (! hr.equals(W32Errors.S_OK)) {
    		throw new Win32Exception(hr);
    	}
    	return Native.toString(pszPath);
	}
	
	/**
	 * Get a special folder path.
	 * @param nFolder
	 *  Folder CSLID.
	 * @return
	 *  Special folder path.
	 */
	public static String getFolderPath(int nFolder) {
		return getFolderPath(null, nFolder, ShlObj.SHGFP_TYPE_CURRENT);
	}
	
    /**
     * Retrieves the full path of a known folder identified by the folder's KNOWNFOLDERID. This function replaces 
     * {@link #getFolderPath}. That older function is now simply a wrapper for getKnownFolderPath
     * @param guid the KNOWNFOLDERS GUID as defined in {@link KnownFolders}
     * @return the path of the known folder. The returned path does not include a trailing backslash. For example,
     *        "C:\Users" is returned rather than "C:\Users\".
     * @throws Win32Exception if the guid references a KNOWNFOLDERID which does not have a path (such as a folder marked
     *        as KF_CATEGORY_VIRTUAL) or that the KNOWNFOLDERID is not present on the system. Not all KNOWNFOLDERID values are
     *        present on all systems.
     */
    public static String getKnownFolderPath(GUID guid) throws Win32Exception
    {
        int flags = ShlObj.KNOWN_FOLDER_FLAG.NONE.getFlag();
        PointerByReference outPath = new PointerByReference();
        HANDLE token = null;
        HRESULT hr = Shell32.INSTANCE.SHGetKnownFolderPath(guid, flags, token, outPath);

        if (!W32Errors.SUCCEEDED(hr.intValue()))
        {
            throw new Win32Exception(hr);
        }

        String result = outPath.getValue().getWideString(0);
        Ole32.INSTANCE.CoTaskMemFree(outPath.getValue());

        return result;
    }

	/**
     * Retrieves the path of a special folder, identified by its CSIDL.
     *
     * @param csidl
     *            A CSIDL that identifies the folder of interest. If a virtual folder is specified, this function will fail.
     * @param create
     *            Indicates whether the folder should be created if it does not already exist. If this value is nonzero, the folder is created. If this value is
     *            zero, the folder is not created.
     * @return The drive and path of the specified folder
     */
    public static final String getSpecialFolderPath(final int csidl, final boolean create) {
        final char[] pszPath = new char[WinDef.MAX_PATH];
        if (!Shell32.INSTANCE.SHGetSpecialFolderPath(null, pszPath, csidl, create))
            throw new Win32Exception(Kernel32.INSTANCE.GetLastError());
        return Native.toString(pszPath);
    }
}