/*
 * Grouch.app				Copyright (C) 2006 Andy Sveikauskas
 * ------------------------------------------------------------------------
 * This program is free software under the GNU General Public License
 * --
 * The "capabilities" handler for channel 2 messages.
 * This just manages other handlers.  Relevant code is:
 *   OscarCapChatInvite		handles chat invitations
 */

#import <Oscar/OscarCapHandler.h>
#import <Foundation/NSEnumerator.h>
#include <stdio.h>

static void Data2String(dest, destlen, src, srclen)
	char *dest;	const unsigned char *src;
	size_t destlen, srclen;
{
	while(srclen-- && destlen >= 3)
	{
		snprintf(dest, destlen, "%.2x", *src++);
		dest += 2;
		destlen -= 2;
	}
}

static NSString *convertCapString(const void *cap)
{
	char buf[OSCAR_CAP_SIZE*2+1];
	Data2String(buf, sizeof(buf), cap, OSCAR_CAP_SIZE);
	return [NSString stringWithCString:buf];
}

@implementation OscarCapHandler

+ sharedInstance
{
	static id r = nil;
	if(r)
		return r;
	else
		return r = [self new];
}

- init
{
	[super init];
	caps = [NSMutableDictionary new];
	[self add:[OscarCapChatInvite new]];
	return self;
}

- (void)dealloc
{
	[caps release];
	[super dealloc];
}

- (void)add:(id<OscarCapHandler>)cap
{
	NSData *representation = [cap capabilityBuffer];
	const char *bytes = [representation bytes];
	size_t n = [representation length];
	while(n >= OSCAR_CAP_SIZE)
	{
		[caps setObject:cap forKey:convertCapString(bytes)];
		bytes += OSCAR_CAP_SIZE;
		n -= OSCAR_CAP_SIZE;
	}
}

- (NSData*)capabilityBuffer
{
	NSMutableData *r = [NSMutableData data];
	NSEnumerator *e = [caps objectEnumerator];
	id<OscarCapHandler> h;
	while( (h=[e nextObject]) )
		[r appendData:[h capabilityBuffer]];
	return r;
}

- (BOOL)handleCapability:(const void *)cap
	from:(id<GrouchUser>)user onClient:(OscarClient*)cli
	type:(int)type cookie:(const void *)cookie tlv:(OscarTlvListIn*)tlv
	message:(NSString*)str
{
	id<OscarCapHandler> h = [caps objectForKey:convertCapString(cap)];
	return h ? [h handleCapability:cap from:user onClient:cli
		type:type cookie:cookie tlv:tlv message:str] : NO;
}

@end

@implementation OscarCapHandlerSimple
- (NSData*)capabilityBuffer
{
	return [NSData dataWithBytesNoCopy:(char*)cap length:len
			freeWhenDone:NO];
}

- (BOOL)handleCapability:(const void *)cap
	from:(id<GrouchUser>)user onClient:(OscarClient*)cli
	type:(int)type cookie:(const void *)cookie tlv:(OscarTlvListIn*)tlv
	message:(NSString*)str
{
	return YES;
}
@end