/*===========================================================================
*
*                            PUBLIC DOMAIN NOTICE
*               National Center for Biotechnology Information
*
*  This software/database is a "United States Government Work" under the
*  terms of the United States Copyright Act.  It was written as part of
*  the author's official duties as a United States Government employee and
*  thus cannot be copyrighted.  This software/database is freely available
*  to the public for use. The National Library of Medicine and the U.S.
*  Government have not placed any restriction on its use or reproduction.
*
*  Although all reasonable efforts have been taken to ensure the accuracy
*  and reliability of the software and data, the NLM and the U.S.
*  Government do not and cannot warrant the performance or results that
*  may be obtained by using this software or data. The NLM and the U.S.
*  Government disclaim all warranties, express or implied, including
*  warranties of performance, merchantability or fitness for any particular
*  purpose.
*
*  Please cite the author in any work or product based on this material.
*
* ===========================================================================
*
*/

#include <kapp/extern.h>
#include "main-priv.h"
#include <sysalloc.h>
#include <kapp/main.h>
#include <kfg/config.h>
#include <kproc/procmgr.h>
#include <klib/report.h>
#include <klib/writer.h>
#include <klib/log.h>
#include <klib/status.h>
#include <klib/rc.h>

#include <strtol.h>

#include <stdlib.h>
#include <assert.h>
#include <string.h>

#if 0
/* NextArg
 *  extracts the next argument from a switch parameter
 *
 *  "arg" is an indirect pointer to somewhere within an
 *  argument string, representing the last character parsed,
 *  e.g. "-auv"
 *         ^    : "arg" indicates the 'a'.
 *  in the example given, NextArg will advance the pointer
 *  to point to the 'u'.
 *
 *  had "arg" pointed instead to the 'v' above, i.e. there
 *  are no characters remaining in "arg" to be parsed, then
 *  an attempt to return the next element of "argv" will be
 *  made by invoking NextArgh.
 *
 *  "arg" [ IN, OUT ] - current argument string as indicated above
 *
 *  "i" [ IN, OUT ] - loop counter. required to be < argc,
 *  advanced if necessary to access next argument in argv.
 *
 *  "argc" [ IN ] - number of arguments in argv
 *
 *  "argv" [ IN ] - program arguments
 *
 *  "handle_null" [ IN, NULL OKAY ] and "data" [ IN, OPAQUE ] -
 *  optional callback function to handle NULL arguments. default
 *  behavior is to log error using "logerr" and invoke "exit".
 */
const char * CC NextArg ( const char **argp, int *i, int argc, char *argv [],
    const char * ( CC * handle_null ) ( void *data ), void *data )
{
    if ( argp != NULL )
    {
        const char *arg = * argp;
        if ( arg != NULL && arg [ 0 ] != 0 && arg [ 1 ] != 0 )
        {
            * argp = "-";
            return arg + 1;
        }
        return NextArgh ( i, argc, argv, handle_null, data );
    }

    /* report a fatal error if no arg given */
    if ( handle_null == NULL )
    {
        rc_t rc = RC ( rcApp, rcArgv, rcAccessing, rcParam, rcNull );
        LOGERR ( klogFatal, ( klogFatal, rc, "internal error" ));
        exit ( 5 );
    }

    return ( * handle_null ) ( data );
}
#endif

/* AsciiToXXX
 *  replacement for atoi
 *  converts NUL terminated string in "arg" to integer
 *  invokes error handler if there is a format error in string
 *
 *  "arg" [ IN ] - NUL terminated textual representation of integer
 *  obeys standard conversion rules:
 *    starts with "0x" or "0X" - interpret as hex
 *    starts with '0' - interpret as octal
 *    otherwise - interpret as decimal
 *
 *  "handler_error" [ IN, NULL OKAY ] and "data" [ IN, OPAQUE ] -
 *  optional callback function to handle case where "arg" could not
 *  be processed in its entirety. default behavior is to log error
 *  using "logerr" and invoke "exit".
 */
static
void CC HandleAsciiToIntError ( const char *arg, void *ignore )
{
    rc_t rc;

    if ( arg == NULL )
        rc = RC ( rcApp, rcNumeral, rcConverting, rcString, rcNull );
    else if ( arg [ 0 ] == 0 )
        rc = RC ( rcApp, rcNumeral, rcConverting, rcString, rcEmpty );
    else
        rc = RC ( rcApp, rcNumeral, rcConverting, rcString, rcInvalid );

    LOGERR ( klogFatal, rc, "expected numeral" );
    exit ( 10 );
}

int32_t CC AsciiToI32 ( const char *arg,
    void ( CC * handle_error ) ( const char *arg, void *data ), void *data )
{
    if ( handle_error == NULL )
        handle_error = HandleAsciiToIntError;

    if ( arg != NULL && arg [ 0 ] != 0 )
    {
        char *end;
        long int i = strtol ( arg, & end, 0 );
        if ( end [ 0 ] == 0 )
        {
            if ( sizeof i == sizeof ( int32_t ) )
                return ( int32_t ) i;

            if ( ( ( i < 0 ) && ( ( ( uint64_t ) - i ) >> 32 ) == 0 ) ||
                 ( ( i > 0 ) && ( ( ( uint64_t ) i ) >> 32 ) == 0 ) )
                return ( int32_t ) i;
        }
    }

    ( * handle_error ) ( arg, data );
    return 0;
}

uint32_t CC AsciiToU32 ( const char *arg,
    void ( CC * handle_error ) ( const char *arg, void *data ), void *data )
{
    if ( handle_error == NULL )
        handle_error = HandleAsciiToIntError;

    if ( arg != NULL && arg [ 0 ] != 0 )
    {
        char *end;
        unsigned long int i = strtoul ( arg, & end, 0 );
        if ( end [ 0 ] == 0 )
        {
            if ( sizeof i == sizeof ( uint32_t ) )
                return ( uint32_t ) i;

            if ( ( ( ( uint64_t ) i ) >> 32 ) == 0 )
                return ( uint32_t ) i;
        }
    }

    ( * handle_error ) ( arg, data );
    return 0;
}

int64_t CC AsciiToI64 ( const char *arg,
    void ( CC * handle_error ) ( const char *arg, void *data ), void *data )
{
    if ( handle_error == NULL )
        handle_error = HandleAsciiToIntError;

    if ( arg != NULL && arg [ 0 ] != 0 )
    {
        char *end;
        int64_t i = strtoi64 ( arg, & end, 0 );

        if ( end [ 0 ] == 0 )
            return i;
    }

    ( * handle_error ) ( arg, data );
    return 0;
}

uint64_t CC AsciiToU64 ( const char *arg,
    void ( CC * handle_error ) ( const char *arg, void *data ), void *data )
{
    if ( handle_error == NULL )
        handle_error = HandleAsciiToIntError;

    if ( arg != NULL && arg [ 0 ] != 0 )
    {
        char *end;
        uint64_t i = strtou64 ( arg, & end, 0 );

        if ( end [ 0 ] == 0 )
            return i;
    }

    ( * handle_error ) ( arg, data );
    return 0;
}

/* KLogLevelParamStrings
 *  Used to compare against command line parameters
 *  These must match KLogLEvel enum in log.h
 */
static
void CC logLevelFromString ( const char * str, void *data )
{
    KLogLevel ix;
    const char ** paramStrings;

    paramStrings = KLogGetParamStrings();

    for ( ix = klogLevelMin; ix <= klogLevelMax; ++ix )
    {
        if ( strcmp ( str, paramStrings [ ( int ) ix ] ) == 0 )
        {
            * ( int32_t* ) data = ix;
            return;
        }
    }

    /* this RC should reflect an invalid string parameter to set the log level */
    PLOGERR ( klogFatal, ( klogFatal, RC ( rcApp, rcArgv, rcParsing, rcRange, rcInvalid ),
                           "log level '$(lvl)' is unrecognized", "lvl=%s", str ));
    exit ( 10 );
}

static
rc_t LogLevelAbsolute ( const char * string )
{
    int32_t 	new_level;
    int32_t	absolute_level = -1;	/* if this remains -1 then we didn't have a good symbolic string */

    /* parse as if integer value but fail over to symbolic strings */
    new_level = AsciiToU32 ( string, logLevelFromString, & absolute_level );

    return KLogLevelSet( ( KLogLevel ) ( ( absolute_level == -1 ) ? new_level : absolute_level ) );
}

static
rc_t LogLevelRelative ( const char * string )
{
    int32_t adjust = 0;
    int i;

    for ( i = 0; string [ i ] != 0; ++ i )
    {
        switch ( string [ i ] )
        {
        case '+':
            ++ adjust;
            break;
            
        case '-':
            -- adjust;
            break;
            
        default:
            return RC ( rcApp, rcArgv, rcParsing, rcToken, rcUnrecognized );
        }
    }
    KLogLevelAdjust(adjust);
    return 0;
}

rc_t CC NextLogLevelCommon ( const char * level_parameter )
{
    if ( level_parameter == NULL )
        return RC ( rcApp, rcArgv, rcParsing, rcString, rcNull );

    if ( ( level_parameter [ 0 ] == '+' ) || ( level_parameter [ 0 ] == '-' ) )
        return LogLevelRelative ( level_parameter );

    return LogLevelAbsolute ( level_parameter );
}

#if 0
static
void CC HandleLogLevelError ( rc_t rc )
{
    LOGERR ( klogFatal, rc, "expected log level" );
    exit ( 10 );
}

/* NextLogLevel
 *  handle a numeric or textual argument to --log-level <level>  The --log-level is not
 *  specified here and could be any string of the programmers choice
 */ 
void CC NextLogLevel ( const char ** argp,
		    int *ip,
		    int argc,
		    char *argv [],
		    const char* ( CC * handle_null ) ( void *data ), void *data )
{
    rc_t rc = NextLogLevelCommon ( NextArg ( argp, ip, argc, argv, handle_null, data ) );
    if ( rc != 0 )
    {
        if ( handle_null != NULL )
            ( * handle_null ) ( data );
        else
            HandleLogLevelError ( rc );
    }
}

/* NextLogLevelh
 *  handle a numeric or textual argument to --log-level <level>  The --log-level is not
 *  specified here and could be any string of the programmers choice
 */ 
void CC NextLogLevelh (int *ip,
		    int argc,
		    char *argv [],
		    const char* ( CC * handle_null ) ( void *data ), void *data )
{
    rc_t rc = NextLogLevelCommon ( NextArgh ( ip, argc, argv, handle_null, data ) );
    if ( rc != 0 )
    {
        if ( handle_null != NULL )
            ( * handle_null ) ( data );
        else
            HandleLogLevelError ( rc );
    }
}
#endif

/* KMane
 *  executable entrypoint "main" is implemented by
 *  an OS-specific wrapper that takes care of establishing
 *  signal handlers, logging, etc.
 *
 *  in turn, OS-specific "main" will invoke "KMain" as
 *  platform independent main entrypoint.
 *
 *  "argc" [ IN ] - the number of textual parameters in "argv"
 *  should never be < 0, but has been left as a signed int
 *  for reasons of tradition.
 *
 *  "argv" [ IN ] - array of NUL terminated strings expected
 *  to be in the shell-native character set: ASCII or UTF-8
 *  element 0 is expected to be executable identity or path.
 */
static
void CC atexit_task ( void )
{
    KProcMgrWhack ();
}

rc_t KMane ( int argc, char *argv [] )
{
    rc_t rc;

    /* get application version */
    ver_t vers = KAppVersion ();

    /* initialize cleanup tasks */
    int status = atexit ( atexit_task );
    if ( status != 0 )
        return SILENT_RC ( rcApp, rcNoTarg, rcInitializing, rcFunction, rcNotAvailable );

    /* initialize error reporting */
    ReportInit ( argc, argv, vers );

    /* initialize proc mgr */
    rc = KProcMgrInit ();
    if ( rc != 0 )
        return rc;

    /* initialize logging */
    rc = KWrtInit(argv[0], vers);
    if ( rc == 0 )
        rc = KLogLibHandlerSetStdErr ();
    if ( rc == 0 )
        rc = KStsLibHandlerSetStdOut ();

    if ( rc == 0 )
    {
#if KFG_COMMON_CREATION
        KConfig *kfg;
        rc = KConfigMake ( & kfg );
        if ( rc == 0 )
        {
#endif
            rc = KMain ( argc, argv );
            if ( rc != 0 )
            {

#if _DEBUGGING
                rc_t rc2;
                uint32_t lineno;
                const char *filename, *function;
                while ( GetUnreadRCInfo ( & rc2, & filename, & function, & lineno ) )
                {
                    pLogErr ( klogWarn, rc2, "$(filename):$(lineno) within $(function)"
                              , "filename=%s,lineno=%u,function=%s"
                              , filename
                              , lineno
                              , function
                        );
                }
#endif

            }
#if KFG_COMMON_CREATION
            KConfigRelease ( kfg );
        }
#endif
    }

    /* finalize error reporting */
    ReportSilence ();
    ReportFinalize ( rc );

    return rc;
}
