/*
 Additions to Cocoa touch classes
 
 Copyright 2013 Thinstuff Technologies GmbH, Authors: Dorian Johnson, Martin Fleisz
 
 This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
 If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#import "TSXAdditions.h"
#include <openssl/bio.h>
#include <openssl/evp.h>

@implementation NSObject (TSXAdditions)

- (void)setValuesForKeyPathsWithDictionary:(NSDictionary *)keyedValues
{
	for (id keyPath in keyedValues)
		[self setValue:[keyedValues objectForKey:keyPath] forKeyPath:keyPath];
}

- mutableDeepCopy
{
    if([self respondsToSelector:@selector(mutableCopyWithZone:)])
        return [self mutableCopy];
    else if([self respondsToSelector:@selector(copyWithZone:)])
        return [self copy];
    else
        return [self retain];
}

@end

#pragma mark -

@implementation NSString (TSXAdditions)

#pragma mark Creation routines
+ (NSString*)stringWithUUID
{
	CFUUIDRef uuidObj = CFUUIDCreate(nil);
	NSString* uuidString = (NSString*)CFUUIDCreateString(nil, uuidObj);
	CFRelease(uuidObj);
	return [uuidString autorelease];
}

/* Code from http://code.google.com/p/google-toolbox-for-mac/source/browse/trunk/Foundation/GTMNSData%2BHex.m?r=344 */ 
- (NSData*)dataFromHexString
{
    NSData *hexData = [self dataUsingEncoding:NSASCIIStringEncoding];
    const char *hexBuf = [hexData bytes];
    NSUInteger hexLen = [hexData length];
    
    // This indicates an error converting to ASCII.
    if (!hexData)
        return nil;
    
    if ((hexLen % 2) != 0) {
        return nil;
    }
    
    NSMutableData *binaryData = [NSMutableData dataWithLength:(hexLen / 2)];
    unsigned char *binaryPtr = [binaryData mutableBytes];
    unsigned char value = 0;
    for (NSUInteger i = 0; i < hexLen; i++) {
        char c = hexBuf[i];
        
        if (!isxdigit(c)) {
            return nil;
        }
        
        if (isdigit(c)) {
            value += c - '0';
        } else if (islower(c)) {
            value += 10 + c - 'a';
        } else {
            value += 10 + c - 'A';
        }
        
        if (i & 1) {
            *binaryPtr++ = value;
            value = 0;
        } else {
            value <<= 4;
        }
    }
    
    return [NSData dataWithData:binaryData];    
}

+ (NSString*)hexStringFromData:(const unsigned char *)data ofSize:(unsigned int)size withSeparator:(NSString *)sep afterNthChar:(int)sepnth
{
	int i;
	NSMutableString *result;
	NSString *immutableResult;
	
	result = [[NSMutableString alloc] init];
	for (i = 0; i < size; i++) {
		if(i && sep && sepnth && i%sepnth==0)
			[result appendString:sep];
		[result appendFormat:@"%02X", data[i]];
	}
	
	immutableResult = [NSString stringWithString:result];
	[result release];
	return immutableResult;
}

@end

#pragma mark Mutable deep copy for dicionary, array and set

@implementation NSDictionary (TSXAdditions)

- mutableDeepCopy
{
    NSMutableDictionary *newDictionary = [[NSMutableDictionary alloc] init];
    NSEnumerator *enumerator = [self keyEnumerator];
    id key;
    while((key = [enumerator nextObject]))
    {
        id obj = [[self objectForKey:key] mutableDeepCopy];
        [newDictionary setObject:obj forKey:key];
        [obj release];
    }
    return newDictionary;
}

@end

@implementation NSArray (TSXAdditions)

- mutableDeepCopy
{
    NSMutableArray *newArray = [[NSMutableArray alloc] init];
    NSEnumerator *enumerator = [self objectEnumerator];
    id obj;
    while((obj = [enumerator nextObject]))
    {
        obj = [obj mutableDeepCopy];
        [newArray addObject:obj];
        [obj release];
    }
    return newArray;
}

@end

@implementation NSSet (TSXAdditions)

- mutableDeepCopy
{
    NSMutableSet *newSet = [[NSMutableSet alloc] init];
    NSEnumerator *enumerator = [self objectEnumerator];
    id obj;
    while((obj = [enumerator nextObject]))
    {
        obj = [obj mutableDeepCopy];
        [newSet addObject:obj];
        [obj release];
    }
    return newSet;
}

@end


#pragma mark -

/* Code from http://stackoverflow.com/questions/1305225/best-way-to-serialize-a-nsdata-into-an-hexadeximal-string */
@implementation NSData (TSXAdditions)

#pragma mark - String Conversion
- (NSString *)hexadecimalString {
    /* Returns hexadecimal string of NSData. Empty string if data is empty.   */
    
    const unsigned char *dataBuffer = (const unsigned char *)[self bytes];
    
    if (!dataBuffer)
        return [NSString string];
    
    NSUInteger          dataLength  = [self length];
    NSMutableString     *hexString  = [NSMutableString stringWithCapacity:(dataLength * 2)];
    
    for (int i = 0; i < dataLength; ++i)
        [hexString appendString:[NSString stringWithFormat:@"%02lx", (unsigned long)dataBuffer[i]]];
    
    return [NSString stringWithString:hexString];
}

/* Code from http://cocoawithlove.com/2009/06/base64-encoding-options-on-mac-and.html */
- (NSString *)base64EncodedString
{
    // Construct an OpenSSL context
    BIO *context = BIO_new(BIO_s_mem());
    
    // Tell the context to encode base64
    BIO *command = BIO_new(BIO_f_base64());
    context = BIO_push(command, context);
    BIO_set_flags(context, BIO_FLAGS_BASE64_NO_NL);
    
    // Encode all the data
    BIO_write(context, [self bytes], [self length]);
    (void)BIO_flush(context);
    
    // Get the data out of the context
    char *outputBuffer;
    long outputLength = BIO_get_mem_data(context, &outputBuffer);
    NSString *encodedString = [[NSString alloc] initWithBytes:outputBuffer length:outputLength encoding:NSASCIIStringEncoding];
    
    BIO_free_all(context);
    
    return encodedString;
}

@end