/*

     File: LogManager.m

 Abstract: A singleton for logging.

  Version: 1.1

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 */

#import "LogManager.h"

#include <asl.h>

@interface ASLLogManager : LogManager

@end

@implementation ASLLogManager {

    aslclient       _client;

    aslmsg          _messageTemplate;

}

- (instancetype)init

{

    self = [super init];

    if (self != nil) {

        self->_client = asl_open(NULL, "PreLoginAgents", 0);

        assert(self->_client != NULL);

        (void) asl_set_filter(self->_client, ASL_FILTER_MASK_UPTO(ASL_LEVEL_INFO));

        self->_messageTemplate = asl_new(ASL_TYPE_MSG);

        assert(self->_messageTemplate != NULL);

        // If you set state in the message template here then it'll be included in all 

        // messages logged.

    }

    return self;

}

- (void)dealloc

{

    if (self->_messageTemplate != NULL) {

        asl_free(self->_messageTemplate);

    }

    if (self->_client != NULL) {

        asl_close(self->_client);

    }

}

- (void)logWithFormat:(NSString *)format, ...

{

    va_list     ap;

    NSString *  str;

    va_start(ap, format);

    str = [[NSString alloc] initWithFormat:format arguments:ap];

    va_end(ap);

    (void) asl_log(self->_client, self->_messageTemplate, ASL_LEVEL_INFO, "%s", [str UTF8String]);

}

@end

@interface NSLogManager : LogManager

- (void)logWithFormat:(NSString *)format, ...;

@end

@implementation NSLogManager

- (void)logWithFormat:(NSString *)format, ...;

{

    va_list     ap;

    va_start(ap, format);

    NSLogv(format, ap);

    va_end(ap);

}

@end

@implementation LogManager

+ (LogManager *)sharedManager

{

    static dispatch_once_t  sOnceToken;

    static LogManager *     sLogManager;

    dispatch_once(&sOnceToken, ^{

        // Change the following to log via ASL (the default) or NSLog.

        if (YES) {

            sLogManager = [[ASLLogManager alloc] init];

        } else {

            sLogManager = [[NSLogManager alloc] init];

        }

    });

    return sLogManager;

}

- (void)logWithFormat:(NSString *)format, ...

{

    #pragma unused(format)

    assert(NO);

}

@end