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//
// ServerBrowser.m
// Chatty
//
// Copyright (c) 2009 Peter Bakhyryev <peter@byteclub.com>, ByteClub LLC
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.

#import "ServerBrowserDelegate.h"
#import "ServerBrowser.h"


// A category on NSNetService that's used to sort NSNetService objects by their name.
@interface NSNetService (BrowserViewControllerAdditions)
- (NSComparisonResult) localizedCaseInsensitiveCompareByName:(NSNetService*)aService;
@end

@implementation NSNetService (BrowserViewControllerAdditions)
- (NSComparisonResult) localizedCaseInsensitiveCompareByName:(NSNetService*)aService {
return [[self name] localizedCaseInsensitiveCompare:[aService name]];
}
@end


// Private properties and methods
@interface ServerBrowser ()

// Sort services alphabetically
- (void)sortServers;

@end


@implementation ServerBrowser

@synthesize servers;
@synthesize delegate;

// Initialize
- (id)init {
  servers = [[NSMutableArray alloc] init];
  return self;
}


// Cleanup
- (void)dealloc {
  if ( servers != nil ) {
    [servers release];
    servers = nil;
  }
  self.delegate = nil;
  [super dealloc];
}


// Start browsing for servers
- (BOOL)start {
  // Restarting?
  if ( netServiceBrowser != nil ) {
    [self stop];
  }

netServiceBrowser = [[NSNetServiceBrowser alloc] init];
if( !netServiceBrowser ) {
return NO;
}

netServiceBrowser.delegate = self;
[netServiceBrowser searchForServicesOfType:@"_zsync._tcp." inDomain:@""];
  
  return YES;
}


// Terminate current service browser and clean up
- (void)stop {
  if ( netServiceBrowser == nil ) {
    return;
  }
  
  [netServiceBrowser stop];
  [netServiceBrowser release];
  netServiceBrowser = nil;
  
  [servers removeAllObjects];
}


// Sort servers array by service names
- (void)sortServers {
  [servers sortUsingSelector:@selector(localizedCaseInsensitiveCompareByName:)];
}


#pragma mark -
#pragma mark NSNetServiceBrowser Delegate Method Implementations

// New service was found
- (void)netServiceBrowser:(NSNetServiceBrowser *)netServiceBrowser didFindService:(NSNetService *)netService moreComing:(BOOL)moreServicesComing {
  // Make sure that we don't have such service already (why would this happen? not sure)
  if ( ! [servers containsObject:netService] ) {
    // Add it to our list
    [servers addObject:netService];
  }

  // If more entries are coming, no need to update UI just yet
  if ( moreServicesComing ) {
    return;
  }
  
  // Sort alphabetically and let our delegate know
  [self sortServers];
  [delegate updateServerList];
}


// Service was removed
- (void)netServiceBrowser:(NSNetServiceBrowser *)netServiceBrowser didRemoveService:(NSNetService *)netService moreComing:(BOOL)moreServicesComing {
  // Remove from list
  [servers removeObject:netService];

  // If more entries are coming, no need to update UI just yet
  if ( moreServicesComing ) {
    return;
  }
  
  // Sort alphabetically and let our delegate know
  [self sortServers];
  [delegate updateServerList];
}

@end
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