/*
 * CMD - Wine-compatible command line interface - batch interface.
 *
 * Copyright (C) 1999 D A Pickles
 * Copyright (C) 2007 J Edmeades
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "wcmd.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(cmd);

/****************************************************************************
 * WCMD_batch
 *
 * Open and execute a batch file.
 * On entry *command includes the complete command line beginning with the name
 * of the batch file (if a CALL command was entered the CALL has been removed).
 * *file is the name of the file, which might not exist and may not have the
 * .BAT suffix on. Called is 1 for a CALL, 0 otherwise.
 *
 * We need to handle recursion correctly, since one batch program might call another.
 * So parameters for this batch file are held in a BATCH_CONTEXT structure.
 *
 * To support call within the same batch program, another input parameter is
 * a label to goto once opened.
 */

void WCMD_batch (WCHAR *file, WCHAR *command, int called, WCHAR *startLabel, HANDLE pgmHandle) {

  HANDLE h = INVALID_HANDLE_VALUE;
  BATCH_CONTEXT *prev_context;

  if (startLabel == NULL) {
    h = CreateFileW (file, GENERIC_READ, FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,
                     NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (h == INVALID_HANDLE_VALUE) {
      SetLastError (ERROR_FILE_NOT_FOUND);
      WCMD_print_error ();
      return;
    }
  } else {
    DuplicateHandle(GetCurrentProcess(), pgmHandle,
                    GetCurrentProcess(), &h,
                    0, FALSE, DUPLICATE_SAME_ACCESS);
  }

/*
 *	Create a context structure for this batch file.
 */

  prev_context = context;
  context = LocalAlloc (LMEM_FIXED, sizeof (BATCH_CONTEXT));
  context -> h = h;
  context->batchfileW = WCMD_strdupW(file);
  context -> command = command;
  memset(context -> shift_count, 0x00, sizeof(context -> shift_count));
  context -> prev_context = prev_context;
  context -> skip_rest = FALSE;

  /* If processing a call :label, 'goto' the label in question */
  if (startLabel) {
    strcpyW(param1, startLabel);
    WCMD_goto(NULL);
  }

/*
 * 	Work through the file line by line. Specific batch commands are processed here,
 * 	the rest are handled by the main command processor.
 */

  while (context -> skip_rest == FALSE) {
      CMD_LIST *toExecute = NULL;         /* Commands left to be executed */
      if (!WCMD_ReadAndParseLine(NULL, &toExecute, h))
        break;
      WCMD_process_commands(toExecute, FALSE, NULL, NULL);
      WCMD_free_commands(toExecute);
      toExecute = NULL;
  }
  CloseHandle (h);

/*
 *	If invoked by a CALL, we return to the context of our caller. Otherwise return
 *	to the caller's caller.
 */

  HeapFree(GetProcessHeap(), 0, context->batchfileW);
  LocalFree (context);
  if ((prev_context != NULL) && (!called)) {
    prev_context -> skip_rest = TRUE;
    context = prev_context;
  }
  context = prev_context;
}

/*******************************************************************
 * WCMD_parameter
 *
 * Extracts a delimited parameter from an input string
 *
 * PARAMS
 *  s     [I] input string, non NULL
 *  n     [I] # of the (possibly double quotes-delimited) parameter to return
 *            Starts at 0
 *  start [O] if non NULL, pointer to the start of the nth parameter in s,
 *            potentially a " character
 *  end   [O] if non NULL, pointer to the last char of
 *            the nth parameter in s, potentially a " character
 *
 * RETURNS
 *  Success: Returns the nth delimited parameter found in s.
 *           *start points to the start of the param, possibly a starting
 *           double quotes character
 *  Failure: Returns an empty string if the param is not found.
 *           *start is set to NULL
 *
 * NOTES
 *  Return value is stored in static storage, hence is overwritten
 *  after each call.
 *  Doesn't include any potentially delimiting double quotes
 */
WCHAR *WCMD_parameter (WCHAR *s, int n, WCHAR **start, WCHAR **end) {
    int curParamNb = 0;
    static WCHAR param[MAX_PATH];
    WCHAR *p = s, *q;
    BOOL quotesDelimited;

    if (start != NULL) *start = NULL;
    if (end != NULL) *end = NULL;
    param[0] = '\0';
    while (TRUE) {
        while (*p && ((*p == ' ') || (*p == ',') || (*p == '=') || (*p == '\t')))
            p++;
        if (*p == '\0') return param;

        quotesDelimited = (*p == '"');
        if (start != NULL && curParamNb == n) *start = p;

        if (quotesDelimited) {
            q = ++p;
            while (*p && *p != '"') p++;
        } else {
            q = p;
            while (*p && (*p != ' ') && (*p != ',') && (*p != '=') && (*p != '\t'))
                p++;
        }
        if (curParamNb == n) {
            memcpy(param, q, (p - q) * sizeof(WCHAR));
            param[p-q] = '\0';
            if (end) *end = p - 1 + quotesDelimited;
            return param;
        }
        if (quotesDelimited && *p == '"') p++;
        curParamNb++;
    }
}

/****************************************************************************
 * WCMD_fgets
 *
 * Gets one line from a file/console and puts it into buffer buf
 * Pre:  buf has size noChars
 *       1 <= noChars <= MAXSTRING
 * Post: buf is filled with at most noChars-1 characters, and gets nul-terminated
         buf does not include EOL terminator
 * Returns:
 *       buf on success
 *       NULL on error or EOF
 */

WCHAR *WCMD_fgets(WCHAR *buf, DWORD noChars, HANDLE h)
{
  DWORD charsRead;
  BOOL status;
  LARGE_INTEGER filepos;
  DWORD i;

  /* We can't use the native f* functions because of the filename syntax differences
     between DOS and Unix. Also need to lose the LF (or CRLF) from the line. */

  if (!WCMD_is_console_handle(h)) {
    /* Save current file position */
    filepos.QuadPart = 0;
    SetFilePointerEx(h, filepos, &filepos, FILE_CURRENT);
  }

  status = WCMD_ReadFile(h, buf, noChars, &charsRead);
  if (!status || charsRead == 0) return NULL;

  /* Find first EOL */
  for (i = 0; i < charsRead; i++) {
    if (buf[i] == '\n' || buf[i] == '\r')
      break;
  }

  if (!WCMD_is_console_handle(h) && i != charsRead) {
    /* Sets file pointer to the start of the next line, if any */
    filepos.QuadPart += i + 1 + (buf[i] == '\r' ? 1 : 0);
    SetFilePointerEx(h, filepos, NULL, FILE_BEGIN);
  }

  /* Truncate at EOL (or end of buffer) */
  if (i == noChars)
    i--;

  buf[i] = '\0';

  return buf;
}

/* WCMD_splitpath - copied from winefile as no obvious way to use it otherwise */
void WCMD_splitpath(const WCHAR* path, WCHAR* drv, WCHAR* dir, WCHAR* name, WCHAR* ext)
{
        const WCHAR* end; /* end of processed string */
	const WCHAR* p;	 /* search pointer */
	const WCHAR* s;	 /* copy pointer */

	/* extract drive name */
	if (path[0] && path[1]==':') {
		if (drv) {
			*drv++ = *path++;
			*drv++ = *path++;
			*drv = '\0';
		}
	} else if (drv)
		*drv = '\0';

        end = path + strlenW(path);

	/* search for begin of file extension */
	for(p=end; p>path && *--p!='\\' && *p!='/'; )
		if (*p == '.') {
			end = p;
			break;
		}

	if (ext)
		for(s=end; (*ext=*s++); )
			ext++;

	/* search for end of directory name */
	for(p=end; p>path; )
		if (*--p=='\\' || *p=='/') {
			p++;
			break;
		}

	if (name) {
		for(s=p; s<end; )
			*name++ = *s++;

		*name = '\0';
	}

	if (dir) {
		for(s=path; s<p; )
			*dir++ = *s++;

		*dir = '\0';
	}
}

/****************************************************************************
 * WCMD_HandleTildaModifiers
 *
 * Handle the ~ modifiers when expanding %0-9 or (%a-z in for command)
 *    %~xxxxxV  (V=0-9 or A-Z)
 * Where xxxx is any combination of:
 *    ~ - Removes quotes
 *    f - Fully qualified path (assumes current dir if not drive\dir)
 *    d - drive letter
 *    p - path
 *    n - filename
 *    x - file extension
 *    s - path with shortnames
 *    a - attributes
 *    t - date/time
 *    z - size
 *    $ENVVAR: - Searches ENVVAR for (contents of V) and expands to fully
 *                   qualified path
 *
 *  To work out the length of the modifier:
 *
 *  Note: In the case of %0-9 knowing the end of the modifier is easy,
 *    but in a for loop, the for end WCHARacter may also be a modifier
 *    eg. for %a in (c:\a.a) do echo XXX
 *             where XXX = %~a    (just ~)
 *                         %~aa   (~ and attributes)
 *                         %~aaxa (~, attributes and extension)
 *                   BUT   %~aax  (~ and attributes followed by 'x')
 *
 *  Hence search forwards until find an invalid modifier, and then
 *  backwards until find for variable or 0-9
 */
void WCMD_HandleTildaModifiers(WCHAR **start, const WCHAR *forVariable,
                               const WCHAR *forValue, BOOL justFors) {

#define NUMMODIFIERS 11
  static const WCHAR validmodifiers[NUMMODIFIERS] = {
        '~', 'f', 'd', 'p', 'n', 'x', 's', 'a', 't', 'z', '$'
  };

  WIN32_FILE_ATTRIBUTE_DATA fileInfo;
  WCHAR  outputparam[MAX_PATH];
  WCHAR  finaloutput[MAX_PATH];
  WCHAR  fullfilename[MAX_PATH];
  WCHAR  thisoutput[MAX_PATH];
  WCHAR  *pos            = *start+1;
  WCHAR  *firstModifier  = pos;
  WCHAR  *lastModifier   = NULL;
  int   modifierLen     = 0;
  BOOL  finished        = FALSE;
  int   i               = 0;
  BOOL  exists          = TRUE;
  BOOL  skipFileParsing = FALSE;
  BOOL  doneModifier    = FALSE;

  /* Search forwards until find invalid character modifier */
  while (!finished) {

    /* Work on the previous character */
    if (lastModifier != NULL) {

      for (i=0; i<NUMMODIFIERS; i++) {
        if (validmodifiers[i] == *lastModifier) {

          /* Special case '$' to skip until : found */
          if (*lastModifier == '$') {
            while (*pos != ':' && *pos) pos++;
            if (*pos == 0x00) return; /* Invalid syntax */
            pos++;                    /* Skip ':'       */
          }
          break;
        }
      }

      if (i==NUMMODIFIERS) {
        finished = TRUE;
      }
    }

    /* Save this one away */
    if (!finished) {
      lastModifier = pos;
      pos++;
    }
  }

  while (lastModifier > firstModifier) {
    WINE_TRACE("Looking backwards for parameter id: %s / %s\n",
               wine_dbgstr_w(lastModifier), wine_dbgstr_w(forVariable));

    if (!justFors && context && (*lastModifier >= '0' && *lastModifier <= '9')) {
      /* Its a valid parameter identifier - OK */
      break;

    } else if (forVariable && *lastModifier == *(forVariable+1)) {
      /* Its a valid parameter identifier - OK */
      break;

    } else {
      lastModifier--;
    }
  }
  if (lastModifier == firstModifier) return; /* Invalid syntax */

  /* Extract the parameter to play with */
  if (*lastModifier == '0') {
    strcpyW(outputparam, context->batchfileW);
  } else if ((*lastModifier >= '1' && *lastModifier <= '9')) {
    strcpyW(outputparam,
            WCMD_parameter (context -> command, *lastModifier-'0' + context -> shift_count[*lastModifier-'0'],
                            NULL, NULL));
  } else {
    strcpyW(outputparam, forValue);
  }

  /* So now, firstModifier points to beginning of modifiers, lastModifier
     points to the variable just after the modifiers. Process modifiers
     in a specific order, remembering there could be duplicates           */
  modifierLen = lastModifier - firstModifier;
  finaloutput[0] = 0x00;

  /* Useful for debugging purposes: */
  /*printf("Modifier string '%*.*s' and variable is %c\n Param starts as '%s'\n",
             (modifierLen), (modifierLen), firstModifier, *lastModifier,
             outputparam);*/

  /* 1. Handle '~' : Strip surrounding quotes */
  if (outputparam[0]=='"' &&
      memchrW(firstModifier, '~', modifierLen) != NULL) {
    int len = strlenW(outputparam);
    if (outputparam[len-1] == '"') {
        outputparam[len-1]=0x00;
        len = len - 1;
    }
    memmove(outputparam, &outputparam[1], (len * sizeof(WCHAR))-1);
  }

  /* 2. Handle the special case of a $ */
  if (memchrW(firstModifier, '$', modifierLen) != NULL) {
    /* Special Case: Search envar specified in $[envvar] for outputparam
       Note both $ and : are guaranteed otherwise check above would fail */
    WCHAR *begin = strchrW(firstModifier, '$') + 1;
    WCHAR *end   = strchrW(firstModifier, ':');
    WCHAR env[MAX_PATH];
    WCHAR fullpath[MAX_PATH];

    /* Extract the env var */
    memcpy(env, begin, (end-begin) * sizeof(WCHAR));
    env[(end-begin)] = 0x00;

    /* If env var not found, return empty string */
    if ((GetEnvironmentVariableW(env, fullpath, MAX_PATH) == 0) ||
        (SearchPathW(fullpath, outputparam, NULL, MAX_PATH, outputparam, NULL) == 0)) {
      finaloutput[0] = 0x00;
      outputparam[0] = 0x00;
      skipFileParsing = TRUE;
    }
  }

  /* After this, we need full information on the file,
    which is valid not to exist.  */
  if (!skipFileParsing) {
    if (GetFullPathNameW(outputparam, MAX_PATH, fullfilename, NULL) == 0)
      return;

    exists = GetFileAttributesExW(fullfilename, GetFileExInfoStandard,
                                  &fileInfo);

    /* 2. Handle 'a' : Output attributes */
    if (exists &&
        memchrW(firstModifier, 'a', modifierLen) != NULL) {

      WCHAR defaults[] = {'-','-','-','-','-','-','-','-','-','\0'};
      doneModifier = TRUE;
      strcpyW(thisoutput, defaults);
      if (fileInfo.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
        thisoutput[0]='d';
      if (fileInfo.dwFileAttributes & FILE_ATTRIBUTE_READONLY)
        thisoutput[1]='r';
      if (fileInfo.dwFileAttributes & FILE_ATTRIBUTE_ARCHIVE)
        thisoutput[2]='a';
      if (fileInfo.dwFileAttributes & FILE_ATTRIBUTE_HIDDEN)
        thisoutput[3]='h';
      if (fileInfo.dwFileAttributes & FILE_ATTRIBUTE_SYSTEM)
        thisoutput[4]='s';
      if (fileInfo.dwFileAttributes & FILE_ATTRIBUTE_COMPRESSED)
        thisoutput[5]='c';
      /* FIXME: What are 6 and 7? */
      if (fileInfo.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)
        thisoutput[8]='l';
      strcatW(finaloutput, thisoutput);
    }

    /* 3. Handle 't' : Date+time */
    if (exists &&
        memchrW(firstModifier, 't', modifierLen) != NULL) {

      SYSTEMTIME systime;
      int datelen;

      doneModifier = TRUE;
      if (finaloutput[0] != 0x00) strcatW(finaloutput, spaceW);

      /* Format the time */
      FileTimeToSystemTime(&fileInfo.ftLastWriteTime, &systime);
      GetDateFormatW(LOCALE_USER_DEFAULT, DATE_SHORTDATE, &systime,
                        NULL, thisoutput, MAX_PATH);
      strcatW(thisoutput, spaceW);
      datelen = strlenW(thisoutput);
      GetTimeFormatW(LOCALE_USER_DEFAULT, TIME_NOSECONDS, &systime,
                        NULL, (thisoutput+datelen), MAX_PATH-datelen);
      strcatW(finaloutput, thisoutput);
    }

    /* 4. Handle 'z' : File length */
    if (exists &&
        memchrW(firstModifier, 'z', modifierLen) != NULL) {
      /* FIXME: Output full 64 bit size (sprintf does not support I64 here) */
      ULONG/*64*/ fullsize = /*(fileInfo.nFileSizeHigh << 32) +*/
                                  fileInfo.nFileSizeLow;
      static const WCHAR fmt[] = {'%','u','\0'};

      doneModifier = TRUE;
      if (finaloutput[0] != 0x00) strcatW(finaloutput, spaceW);
      wsprintfW(thisoutput, fmt, fullsize);
      strcatW(finaloutput, thisoutput);
    }

    /* 4. Handle 's' : Use short paths (File doesn't have to exist) */
    if (memchrW(firstModifier, 's', modifierLen) != NULL) {
      if (finaloutput[0] != 0x00) strcatW(finaloutput, spaceW);
      /* Don't flag as doneModifier - %~s on its own is processed later */
      GetShortPathNameW(outputparam, outputparam, sizeof(outputparam)/sizeof(outputparam[0]));
    }

    /* 5. Handle 'f' : Fully qualified path (File doesn't have to exist) */
    /*      Note this overrides d,p,n,x                                 */
    if (memchrW(firstModifier, 'f', modifierLen) != NULL) {
      doneModifier = TRUE;
      if (finaloutput[0] != 0x00) strcatW(finaloutput, spaceW);
      strcatW(finaloutput, fullfilename);
    } else {

      WCHAR drive[10];
      WCHAR dir[MAX_PATH];
      WCHAR fname[MAX_PATH];
      WCHAR ext[MAX_PATH];
      BOOL doneFileModifier = FALSE;

      if (finaloutput[0] != 0x00) strcatW(finaloutput, spaceW);

      /* Split into components */
      WCMD_splitpath(fullfilename, drive, dir, fname, ext);

      /* 5. Handle 'd' : Drive Letter */
      if (memchrW(firstModifier, 'd', modifierLen) != NULL) {
        strcatW(finaloutput, drive);
        doneModifier = TRUE;
        doneFileModifier = TRUE;
      }

      /* 6. Handle 'p' : Path */
      if (memchrW(firstModifier, 'p', modifierLen) != NULL) {
        strcatW(finaloutput, dir);
        doneModifier = TRUE;
        doneFileModifier = TRUE;
      }

      /* 7. Handle 'n' : Name */
      if (memchrW(firstModifier, 'n', modifierLen) != NULL) {
        strcatW(finaloutput, fname);
        doneModifier = TRUE;
        doneFileModifier = TRUE;
      }

      /* 8. Handle 'x' : Ext */
      if (memchrW(firstModifier, 'x', modifierLen) != NULL) {
        strcatW(finaloutput, ext);
        doneModifier = TRUE;
        doneFileModifier = TRUE;
      }

      /* If 's' but no other parameter, dump the whole thing */
      if (!doneFileModifier &&
          memchrW(firstModifier, 's', modifierLen) != NULL) {
        doneModifier = TRUE;
        if (finaloutput[0] != 0x00) strcatW(finaloutput, spaceW);
        strcatW(finaloutput, outputparam);
      }
    }
  }

  /* If No other modifier processed,  just add in parameter */
  if (!doneModifier) strcpyW(finaloutput, outputparam);

  /* Finish by inserting the replacement into the string */
  WCMD_strsubstW(*start, lastModifier+1, finaloutput, -1);
}

/*******************************************************************
 * WCMD_call - processes a batch call statement
 *
 *	If there is a leading ':', calls within this batch program
 *	otherwise launches another program.
 */
void WCMD_call (WCHAR *command) {

  /* Run other program if no leading ':' */
  if (*command != ':') {
    WCMD_run_program(command, 1);
  } else {

    WCHAR gotoLabel[MAX_PATH];

    strcpyW(gotoLabel, param1);

    if (context) {

      LARGE_INTEGER li;

      /* Save the current file position, call the same file,
         restore position                                    */
      li.QuadPart = 0;
      li.u.LowPart = SetFilePointer(context -> h, li.u.LowPart,
                     &li.u.HighPart, FILE_CURRENT);

      WCMD_batch (param1, command, 1, gotoLabel, context->h);

      SetFilePointer(context -> h, li.u.LowPart,
                     &li.u.HighPart, FILE_BEGIN);
    } else {
      WCMD_output_asis_stderr(WCMD_LoadMessage(WCMD_CALLINSCRIPT));
    }
  }
}