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/*******************************************************************************
 * Copyright (c) 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at 
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Andrew Niefer
 *******************************************************************************/
 
#include "eclipseCommon.h"
#include "eclipseUnicode.h"

#ifdef _WIN32
#include <direct.h>
#include <windows.h>
#else
#include <unistd.h>
#include <string.h>
#include <dirent.h>
#include <limits.h>
#endif
#include <stdlib.h>
#include <sys/stat.h>

/* Global Variables */
_TCHAR* officialName = NULL;
_TCHAR* osArg        = _T_ECLIPSE(DEFAULT_OS);
_TCHAR* osArchArg    = _T_ECLIPSE(DEFAULT_OS_ARCH);
_TCHAR* wsArg        = _T_ECLIPSE(DEFAULT_WS);	/* the SWT supported GUI to be used */

/* Local Variables */
#ifndef _WIN32
static _TCHAR* filterPrefix = NULL;  /* prefix for the find files filter */
static int     prefixLength = 0;
#endif


/**
 * Convert a wide string to a narrow one
 * Caller must free the null terminated string returned.
 */
char *toNarrow(_TCHAR* src)
{
#ifdef UNICODE
	int byteCount = WideCharToMultiByte (CP_ACP, 0, (wchar_t *)src, -1, NULL, 0, NULL, NULL);
	char *dest = malloc(byteCount+1);
	dest[byteCount] = 0;
	WideCharToMultiByte (CP_UTF8, 0, (wchar_t *)src, -1, dest, byteCount, NULL, NULL);
	return dest;
#else
	return (char*)_tcsdup(src);
#endif
}
 	
 	
 /*
 * Find the absolute pathname to where a command resides.
 *
 * The string returned by the function must be freed.
 */
#define EXTRA 20
_TCHAR* findCommand( _TCHAR* command )
{
    _TCHAR*  cmdPath;
    int    length;
    _TCHAR*  ch;
    _TCHAR*  dir;
    _TCHAR*  path;
    struct _stat stats;

    /* If the command was an abolute pathname, use it as is. */
    if (command[0] == dirSeparator ||
       (_tcslen( command ) > 2 && command[1] == _T_ECLIPSE(':')))
    {
        length = _tcslen( command );
        cmdPath = malloc( (length + EXTRA) * sizeof(_TCHAR) ); /* add extra space for a possible ".exe" extension */
        _tcscpy( cmdPath, command );
    }

    else
    {
        /* If the command string contains a path separator */
        if (_tcschr( command, dirSeparator ) != NULL)
        {
            /* It must be relative to the current directory. */
            length = MAX_PATH_LENGTH + EXTRA + _tcslen( command );
            cmdPath = malloc( length * sizeof (_TCHAR));
            _tgetcwd( cmdPath, length );
            if (cmdPath[ _tcslen( cmdPath ) - 1 ] != dirSeparator)
            {
                length = _tcslen( cmdPath );
                cmdPath[ length ] = dirSeparator;
                cmdPath[ length+1 ] = _T_ECLIPSE('\0');
            }
            _tcscat( cmdPath, command );
        }

        /* else the command must be in the PATH somewhere */
        else
        {
            /* Get the directory PATH where executables reside. */
            path = _tgetenv( _T_ECLIPSE("PATH") );
            if (!path)
            {
	            return NULL;
            }
            else
            {
	            length = _tcslen( path ) + _tcslen( command ) + MAX_PATH_LENGTH;
	            cmdPath = malloc( length * sizeof(_TCHAR));
	
	            /* Foreach directory in the PATH */
	            dir = path;
	            while (dir != NULL && *dir != _T_ECLIPSE('\0'))
	            {
	                ch = _tcschr( dir, pathSeparator );
	                if (ch == NULL)
	                {
	                    _tcscpy( cmdPath, dir );
	                }
	                else
	                {
	                    length = ch - dir;
	                    _tcsncpy( cmdPath, dir, length );
	                    cmdPath[ length ] = _T_ECLIPSE('\0');
	                    ch++;
	                }
	                dir = ch; /* advance for the next iteration */

#ifdef _WIN32
                    /* Remove quotes */
	                if (_tcschr( cmdPath, _T_ECLIPSE('"') ) != NULL)
	                {
	                    int i = 0, j = 0, c;
	                    length = _tcslen( cmdPath );
	                    while (i < length) {
	                        c = cmdPath[ i++ ];
	                        if (c == _T_ECLIPSE('"')) continue;
	                        cmdPath[ j++ ] = c;
	                    }
	                    cmdPath[ j ] = _T_ECLIPSE('\0');
	                }
#endif
	                /* Determine if the executable resides in this directory. */
	                if (cmdPath[0] == _T_ECLIPSE('.') &&
	                   (_tcslen(cmdPath) == 1 || (_tcslen(cmdPath) == 2 && cmdPath[1] == dirSeparator)))
	                {
	                	_tgetcwd( cmdPath, MAX_PATH_LENGTH );
	                }
	                if (cmdPath[ _tcslen( cmdPath ) - 1 ] != dirSeparator)
	                {
	                    length = _tcslen( cmdPath );
	                    cmdPath[ length ] = dirSeparator;
	                    cmdPath[ length+1 ] = _T_ECLIPSE('\0');
	                }
	                _tcscat( cmdPath, command );
	
	                /* If the file is not a directory and can be executed */
	                if (_tstat( cmdPath, &stats ) == 0 && (stats.st_mode & S_IFREG) != 0)
	                {
	                    /* Stop searching */
	                    dir = NULL;
	                }
	            }
	        }
        }
    }

#ifdef _WIN32
	/* If the command does not exist */
    if (_tstat( cmdPath, &stats ) != 0 || (stats.st_mode & S_IFREG) == 0)
    {
    	/* If the command does not end with .exe, append it an try again. */
    	length = _tcslen( cmdPath );
    	if (length > 4 && _tcsicmp( &cmdPath[ length - 4 ], _T_ECLIPSE(".exe") ) != 0)
    	    _tcscat( cmdPath, _T_ECLIPSE(".exe") );
    }
#endif

    /* Verify the resulting command actually exists. */
    if (_tstat( cmdPath, &stats ) != 0 || (stats.st_mode & S_IFREG) == 0)
    {
        free( cmdPath );
        cmdPath = NULL;
    }

	return resolveSymlinks(cmdPath);
}

#if !defined(_WIN32) && !defined(MACOSX)
char * resolveSymlinks( char * path ) {
	if(path == NULL)
		return path;
	/* resolve symlinks */
	char * ch = path;
	char * buffer = malloc(PATH_MAX);
    path = realpath(path, buffer);
    free(ch);
    return path;
}
#endif

#ifndef _WIN32
#ifdef MACOSX
static int filter(struct dirent *dir) {
#else
static int filter(const struct dirent *dir) {
#endif
	if(_tcslen(dir->d_name) <= prefixLength)
		return 0;
	return (_tcsncmp(dir->d_name, filterPrefix, prefixLength) == 0 && 
	        dir->d_name[prefixLength] == _T_ECLIPSE('_'));
}
#endif
 /* 
 * Looks for files of the form /path/prefix_version.<extension> and returns the full path to
 * the file with the largest version number
 */ 
_TCHAR* findFile( _TCHAR* path, _TCHAR* prefix)
{
	struct _stat stats;
	int pathLength;
	_TCHAR* candidate = NULL;
	_TCHAR* result = NULL;
	
#ifdef _WIN32
	_TCHAR* fileName = NULL;
	WIN32_FIND_DATA data;
	HANDLE handle;
#else	
	struct dirent **files;
	int count;
#endif
	
	/* does path exist? */
	if( _tstat(path, &stats) != 0 )
		return NULL;

	pathLength = _tcslen(path);
	
#ifdef _WIN32
	fileName = malloc( (_tcslen(path) + 1 + _tcslen(prefix) + 3) * sizeof(_TCHAR));
	fileName = _tcscpy(fileName, path);
	fileName[pathLength] = dirSeparator;
	fileName[pathLength + 1] = 0;
	_tcscat(fileName, prefix);
	_tcscat(fileName, _T_ECLIPSE("_*")); 
	prefix = fileName;
	
	handle = FindFirstFile(prefix, &data);
	if(handle != INVALID_HANDLE_VALUE) {
		candidate = _tcsdup(data.cFileName);
		while(FindNextFile(handle, &data) != 0) {
			fileName = data.cFileName;
			/* compare, take the highest version */
			if( _tcscmp(candidate, fileName) < 0) {
				free(candidate);
				candidate = _tcsdup(fileName);
			}
		}
		FindClose(handle);
	}
#else
	filterPrefix = prefix;
	prefixLength = _tcslen(prefix);
	/* TODO should write out own comparator to better handle OSGi versions */
	count = scandir(path, &files, &filter, alphasort);
	if(count > 0) {
		candidate = _tcsdup(files[count - 1]->d_name);
	}
#endif

	if(candidate != NULL) {
		result = malloc((pathLength + 1 + _tcslen(candidate) + 1) * sizeof(_TCHAR));
		_tcscpy(result, path);
		result[pathLength] = dirSeparator;
		result[pathLength + 1] = 0;
		_tcscat(result, candidate);
		free(candidate);
		return result;
	}
	return NULL;
}

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