/*
 * Copyright (c) 2008-2021 Jonathan Schleifer <js@nil.im>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
 * the packaging of this file.
 *
 * Alternatively, it may be distributed under the terms of the GNU General
 * Public License, either version 2 or 3, which can be found in the file
 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#include "config.h"

#import "OFWindowsRegistryKey.h"
#import "OFData.h"
#import "OFLocale.h"
#import "OFSystemInfo.h"

#include <windows.h>

#import "OFCreateWindowsRegistryKeyFailedException.h"
#import "OFDeleteWindowsRegistryKeyFailedException.h"
#import "OFDeleteWindowsRegistryValueFailedException.h"
#import "OFGetWindowsRegistryValueFailedException.h"
#import "OFInvalidEncodingException.h"
#import "OFInvalidFormatException.h"
#import "OFOpenWindowsRegistryKeyFailedException.h"
#import "OFOutOfRangeException.h"
#import "OFSetWindowsRegistryValueFailedException.h"

OF_DIRECT_MEMBERS
@interface OFWindowsRegistryKey ()
- (instancetype)of_initWithHKey: (HKEY)hKey
			  close: (bool)close;
@end

@implementation OFWindowsRegistryKey
+ (instancetype)classesRootKey
{
	return [[[self alloc] of_initWithHKey: HKEY_CLASSES_ROOT
					close: false] autorelease];
}

+ (instancetype)currentConfigKey
{
	return [[[self alloc] of_initWithHKey: HKEY_CURRENT_CONFIG
					close: false] autorelease];
}

+ (instancetype)currentUserKey
{
	return [[[self alloc] of_initWithHKey: HKEY_CURRENT_USER
					close: false] autorelease];
}

+ (instancetype)localMachineKey
{
	return [[[self alloc] of_initWithHKey: HKEY_LOCAL_MACHINE
					close: false] autorelease];
}

+ (instancetype)usersKey
{
	return [[[self alloc] of_initWithHKey: HKEY_USERS
					close: false] autorelease];
}

- (instancetype)of_initWithHKey: (HKEY)hKey
			  close: (bool)close
{
	self = [super init];

	_hKey = hKey;
	_close = close;

	return self;
}

- (instancetype)init
{
	OF_INVALID_INIT_METHOD
}

- (void)dealloc
{
	if (_close)
		RegCloseKey(_hKey);

	[super dealloc];
}

- (OFWindowsRegistryKey *)openSubkeyAtPath: (OFString *)path
		   securityAndAccessRights: (REGSAM)securityAndAccessRights
{
	return [self openSubkeyAtPath: path
			      options: 0
	      securityAndAccessRights: securityAndAccessRights];
}

- (OFWindowsRegistryKey *)openSubkeyAtPath: (OFString *)path
				   options: (DWORD)options
		   securityAndAccessRights: (REGSAM)securityAndAccessRights
{
	void *pool = objc_autoreleasePoolPush();
	LSTATUS status;
	HKEY subKey;

	if ([OFSystemInfo isWindowsNT])
		status = RegOpenKeyExW(_hKey, path.UTF16String, options,
		    securityAndAccessRights, &subKey);
	else
		status = RegOpenKeyExA(_hKey,
		    [path cStringWithEncoding: [OFLocale encoding]], options,
		    securityAndAccessRights, &subKey);

	if (status != ERROR_SUCCESS) {
		if (status == ERROR_FILE_NOT_FOUND) {
			objc_autoreleasePoolPop(pool);
			return nil;
		}

		@throw [OFOpenWindowsRegistryKeyFailedException
		    exceptionWithRegistryKey: self
					path: path
				     options: options
		     securityAndAccessRights: securityAndAccessRights
				      status: status];
	}

	objc_autoreleasePoolPop(pool);

	return [[[OFWindowsRegistryKey alloc] of_initWithHKey: subKey
							close: true]
	    autorelease];
}

- (OFWindowsRegistryKey *)createSubkeyAtPath: (OFString *)path
		     securityAndAccessRights: (REGSAM)securityAndAccessRights
{
	return [self createSubkeyAtPath: path
				options: 0
		securityAndAccessRights: securityAndAccessRights
		     securityAttributes: NULL
			    disposition: NULL];
}

- (OFWindowsRegistryKey *)
	 createSubkeyAtPath: (OFString *)path
		    options: (DWORD)options
    securityAndAccessRights: (REGSAM)securityAndAccessRights
	 securityAttributes: (LPSECURITY_ATTRIBUTES)securityAttributes
		disposition: (DWORD *)disposition
{
	void *pool = objc_autoreleasePoolPush();
	LSTATUS status;
	HKEY subKey;

	if ([OFSystemInfo isWindowsNT])
		status = RegCreateKeyExW(_hKey, path.UTF16String, 0,
		    NULL, options, securityAndAccessRights, securityAttributes,
		    &subKey, NULL);
	else
		status = RegCreateKeyExA(_hKey,
		    [path cStringWithEncoding: [OFLocale encoding]], 0, NULL,
		    options, securityAndAccessRights, securityAttributes,
		    &subKey, NULL);

	if (status != ERROR_SUCCESS)
		@throw [OFCreateWindowsRegistryKeyFailedException
		    exceptionWithRegistryKey: self
					path: path
				     options: options
		     securityAndAccessRights: securityAndAccessRights
			  securityAttributes: securityAttributes
				      status: status];

	objc_autoreleasePoolPop(pool);

	return [[[OFWindowsRegistryKey alloc] of_initWithHKey: subKey
							close: true]
	    autorelease];
}

- (OFData *)dataForValueNamed: (OFString *)name
			 type: (DWORD *)type
{
	void *pool = objc_autoreleasePoolPush();
	BYTE stackBuffer[256], *buffer = stackBuffer;
	DWORD length = sizeof(stackBuffer);
	OFMutableData *ret = nil;
	bool winNT = [OFSystemInfo isWindowsNT];
	LSTATUS status;

	for (;;) {
		if (winNT)
			status = RegQueryValueExW(_hKey, name.UTF16String,
			    NULL, type, buffer, &length);
		else
			status = RegQueryValueExA(_hKey,
			    [name cStringWithEncoding: [OFLocale encoding]],
			    NULL, type, buffer, &length);

		switch (status) {
		case ERROR_SUCCESS:
			if (buffer == stackBuffer) {
				objc_autoreleasePoolPop(pool);

				return [OFData dataWithItems: buffer
						       count: length];
			} else {
				[ret makeImmutable];
				[ret retain];

				objc_autoreleasePoolPop(pool);

				return [ret autorelease];
			}
		case ERROR_FILE_NOT_FOUND:
			objc_autoreleasePoolPop(pool);

			return nil;
		case ERROR_MORE_DATA:
			objc_autoreleasePoolPop(pool);
			pool = objc_autoreleasePoolPush();

			ret = [OFMutableData dataWithCapacity: length];
			[ret increaseCountBy: length];
			buffer = ret.mutableItems;

			continue;
		default:
			@throw [OFGetWindowsRegistryValueFailedException
			    exceptionWithRegistryKey: self
					   valueName: name
					      status: status];
		}
	}
}

- (void)setData: (OFData *)data
  forValueNamed: (OFString *)name
	   type: (DWORD)type
{
	size_t length = data.count * data.itemSize;
	LSTATUS status;

	if (length > UINT32_MAX)
		@throw [OFOutOfRangeException exception];

	if ([OFSystemInfo isWindowsNT])
		status = RegSetValueExW(_hKey, name.UTF16String, 0, type,
		    data.items, (DWORD)length);
	else
		status = RegSetValueExA(_hKey,
		    [name cStringWithEncoding: [OFLocale encoding]], 0, type,
		    data.items, (DWORD)length);

	if (status != ERROR_SUCCESS)
		@throw [OFSetWindowsRegistryValueFailedException
		    exceptionWithRegistryKey: self
				   valueName: name
					data: data
					type: type
				      status: status];
}

- (OFString *)stringForValueNamed: (OFString *)name
{
	return [self stringForValueNamed: name
				    type: NULL];
}

- (OFString *)stringForValueNamed: (OFString *)name
			     type: (DWORD *)typeOut
{
	void *pool = objc_autoreleasePoolPush();
	DWORD type;
	OFData *data = [self dataForValueNamed: name
					  type: &type];
	OFString *ret;

	if (data == nil)
		return nil;

	if (type != REG_SZ && type != REG_EXPAND_SZ && type != REG_LINK)
		@throw [OFInvalidEncodingException exception];

	if (data.itemSize != 1)
		@throw [OFInvalidFormatException exception];

	if ([OFSystemInfo isWindowsNT]) {
		const of_char16_t *UTF16String = data.items;
		size_t length = data.count;

		if (length % 2 == 1)
			@throw [OFInvalidFormatException exception];

		length /= 2;

		/*
		 * REG_SZ and REG_EXPAND_SZ contain a \0, but can contain data
		 * after it that should be ignored.
		 */
		for (size_t i = 0; i < length; i++) {
			if (UTF16String[i] == 0) {
				length = i;
				break;
			}
		}

		ret = [[OFString alloc] initWithUTF16String: UTF16String
						     length: length];
	} else {
		const char *cString = data.items;
		size_t length = data.count;

		/*
		 * REG_SZ and REG_EXPAND_SZ contain a \0, but can contain data
		 * after it that should be ignored.
		 */
		for (size_t i = 0; i < length; i++) {
			if (cString[i] == 0) {
				length = i;
				break;
			}
		}

		ret = [[OFString alloc] initWithCString: cString
					       encoding: [OFLocale encoding]
						 length: length];
	}

	if (typeOut != NULL)
		*typeOut = type;

	objc_autoreleasePoolPop(pool);

	return [ret autorelease];
}

- (void)setString: (OFString *)string
    forValueNamed: (OFString *)name
{
	[self	setString: string
	    forValueNamed: name
		     type: REG_SZ];
}

- (void)setString: (OFString *)string
    forValueNamed: (OFString *)name
	     type: (DWORD)type
{
	void *pool = objc_autoreleasePoolPush();
	OFData *data;

	if ([OFSystemInfo isWindowsNT])
		data = [OFData dataWithItems: string.UTF16String
				       count: string.UTF16StringLength + 1
				    itemSize: sizeof(of_char16_t)];
	else {
		of_string_encoding_t encoding = [OFLocale encoding];
		const char *cString = [string cStringWithEncoding: encoding];
		size_t length = [string cStringLengthWithEncoding: encoding];

		data = [OFData dataWithItems: cString
				       count: length + 1];
	}

	[self	  setData: data
	    forValueNamed: name
		     type: type];

	objc_autoreleasePoolPop(pool);
}

- (void)deleteValueNamed: (OFString *)name
{
	void *pool = objc_autoreleasePoolPush();
	LSTATUS status;

	if ([OFSystemInfo isWindowsNT])
		status = RegDeleteValueW(_hKey, name.UTF16String);
	else
		status = RegDeleteValueA(_hKey,
		    [name cStringWithEncoding: [OFLocale encoding]]);

	if (status != ERROR_SUCCESS)
		@throw [OFDeleteWindowsRegistryValueFailedException
		    exceptionWithRegistryKey: self
				   valueName: name
				      status: status];

	objc_autoreleasePoolPop(pool);
}

- (void)deleteSubkeyAtPath: (OFString *)subkeyPath
{
	void *pool = objc_autoreleasePoolPush();
	LSTATUS status;

	if ([OFSystemInfo isWindowsNT])
		status = RegDeleteKeyW(_hKey, subkeyPath.UTF16String);
	else
		status = RegDeleteKeyA(_hKey,
		    [subkeyPath cStringWithEncoding: [OFLocale encoding]]);

	if (status != ERROR_SUCCESS)
		@throw [OFDeleteWindowsRegistryKeyFailedException
		    exceptionWithRegistryKey: self
				  subkeyPath: subkeyPath
				      status: status];

	objc_autoreleasePoolPop(pool);
}
@end
