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/*
 *  R : A Computer Language for Statistical Data Analysis
 *  Copyright (C) 1995, 1996  Robert Gentleman and Ross Ihaka
 *  Copyright (C) 1998, 1999 The R Development Core Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifdef HAVE_CONFIG_H
#include <Rconfig.h>
#endif

#include "Defn.h"
#include "Fileio.h"

#include <time.h>

/*  Platform
 *
 *  Return various platform dependent strings.  This is similar to
 *  "Machine", but for strings rather than numerical values.  These
 *  two functions should probably be amalgamated.
 */
static char *R_OSType = OSTYPE;
static char *R_FileSep = FILESEP;
static char *R_DynLoadExt = DYNLOADEXT;

SEXP do_Platform(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    SEXP value, names;
    checkArity(op, args);
    PROTECT(value = allocVector(VECSXP, 3));
    PROTECT(names = allocVector(STRSXP, 3));
    STRING(names)[0] = mkChar("OS.type");
    STRING(names)[1] = mkChar("file.sep");
    STRING(names)[2] = mkChar("dynlib.ext");
    VECTOR(value)[0] = mkString(R_OSType);
    VECTOR(value)[1] = mkString(R_FileSep);
    VECTOR(value)[2] = mkString(R_DynLoadExt);
    setAttrib(value, R_NamesSymbol, names);
    UNPROTECT(2);
    return value;
}

/*  date
 *
 *  Return the current date in a standard format.  This uses standard
 *  POSIX calls which should be available on each platform.  We should
 *  perhaps check this in the configure script.
 */
char *R_Date()
{
    time_t t;
    static char s[26];/* own space */

    time(&t);
    strcpy(s, ctime(&t));
    s[24] = '\0'; /* overwriting the final \n */
    return s;
}

SEXP do_date(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    checkArity(op, args);
    return mkString(R_Date());
}

/*  show.file
 *
 *  Display a file so that a user can view it.  The function calls
 *  "R_ShowFile" which is a platform dependent hook that arranges
 *  for the file to be displayed. A reasonable approach would be to
 *  open a read-only edit window with the file displayed in it.
 *
 *  FIXME : this should in fact take a vector of filenames and titles
 *  and display them concatenated in a window.  For a pure console
 *  version, write down a pipe to a pager.
 */

#ifdef OLD
SEXP do_fileshow(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    SEXP fn, tl;
    checkArity(op, args);
    fn = CAR(args);
    tl = CADR(args);
    if (!isString(fn) || length(fn) < 1 || STRING(fn)[0] == R_NilValue)
    errorcall(call, "invalid filename");
    if (!isString(tl) || length(tl) < 1 || STRING(tl)[0] == R_NilValue)
    errorcall(call, "invalid filename");
    if (!R_ShowFile(R_ExpandFileName(CHAR(STRING(fn)[0])),
                    CHAR(STRING(tl)[0])))
    error("unable to display file \"%s\"", CHAR(STRING(fn)[0]));
    return R_NilValue;
}
#else
SEXP do_fileshow(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    SEXP fn, tl, hd, pg;
    char **f, **h, *t, *vm, *pager;
    int i, n, dl;
    checkArity(op, args);
    vm = vmaxget();
    fn = CAR(args); args = CDR(args);
    hd = CAR(args); args = CDR(args);
    tl = CAR(args); args = CDR(args);
    dl = asLogical(CAR(args)); args = CDR(args);
    pg = CAR(args);
    n = 0;          /* -Wall */
    if (!isString(fn) || (n = length(fn)) < 1)
    errorcall(call, "invalid filename specification");
    if (!isString(hd) || length(hd) != n)
    errorcall(call, "invalid headers");
    if (!isString(tl))
    errorcall(call, "invalid title");
    if (!isString(pg))
        errorcall(call, "invalid pager specification");
    f = (char**)R_alloc(n, sizeof(char*));
    h = (char**)R_alloc(n, sizeof(char*));
    for (i = 0; i < n; i++) {
    if (!isNull(STRING(fn)[i]))
        f[i] = CHAR(STRING(fn)[i]);
    else
        f[i] = CHAR(R_BlankString);
    if (!isNull(STRING(hd)[i]))
        h[i] = CHAR(STRING(hd)[i]);
    else
        h[i] = CHAR(R_BlankString);
    }
    if (length(tl) >= 1 || !isNull(STRING(tl)[0]))
    t = CHAR(STRING(tl)[0]);
    else
    t = CHAR(R_BlankString);
    if (length(pg) >= 1 || !isNull(STRING(pg)[0]))
    pager = CHAR(STRING(pg)[0]);
    else
    pager = CHAR(R_BlankString);
    R_ShowFiles(n, f, h, t, dl, pager);
    vmaxset(vm);
    return R_NilValue;
}
#endif


/*  append.file
 *
 *  Given two file names as arguments and arranges for
 *  the second file to be appended to the second.
 */

#define APPENDBUFSIZE 512

static int R_AppendFile(char *file1, char *file2)
{
    FILE *fp1, *fp2;
    char buf[APPENDBUFSIZE];
    int nchar, status = 0;
    if((fp1 = R_fopen(R_ExpandFileName(file1), "a")) == NULL) {
        return 0;
    }
    if((fp2 = R_fopen(R_ExpandFileName(file2), "r")) == NULL) {
        fclose(fp1);
        return 0;
    }
    while((nchar = fread(buf, 1, APPENDBUFSIZE, fp2)) == APPENDBUFSIZE)
        if(fwrite(buf, 1, APPENDBUFSIZE, fp1) != APPENDBUFSIZE) {
            goto append_error;
        }
    if(fwrite(buf, 1, nchar, fp1) != nchar) {
        goto append_error;
    }
    status = 1;
 append_error:
    if (status == 0)
    warning("write error during file append!");
    fclose(fp1);
    fclose(fp2);
    return status;
}

SEXP do_fileappend(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    SEXP f1, f2, ans;
    int i, n, n1, n2;
    checkArity(op, args);
    f1 = CAR(args); n1 = length(f1);
    f2 = CADR(args); n2 = length(f2);
    if (!isString(f1))
        errorcall(call, "invalid first filename");
    if (!isString(f2))
        errorcall(call, "invalid second filename");
    if (n1 < 1)
    errorcall(call, "nothing to append to");
    if (n2 < 1)
    return allocVector(LGLSXP, 0);
    n = (n1 > n2) ? n1 : n2;
    PROTECT(ans = allocVector(LGLSXP, n));
    for(i = 0; i < n; i++) {
        if (STRING(f1)[i%n1] == R_NilValue || STRING(f2)[i%n2] == R_NilValue)
            LOGICAL(ans)[i] = 0;
        else
            LOGICAL(ans)[i] =
        R_AppendFile(CHAR(STRING(f1)[i%n1]),
                 CHAR(STRING(f2)[i%n2]));
    }
    UNPROTECT(1);
    return ans;
}

SEXP do_filecreate(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    SEXP fn, ans;
    FILE *fp;
    int i, n;
    checkArity(op, args);
    fn = CAR(args);
    if (!isString(fn))
        errorcall(call, "invalid filename argument");
    n = length(fn);
    PROTECT(ans = allocVector(LGLSXP, n));
    for (i = 0; i < n; i++) {
    LOGICAL(ans)[i] = 0;
    if (STRING(fn)[i] != R_NilValue &&
        (fp = R_fopen(R_ExpandFileName(CHAR(STRING(fn)[i])), "w"))
        != NULL) {
        LOGICAL(ans)[i] = 1;
        fclose(fp);
    }
    }
    UNPROTECT(1);
    return ans;
}

SEXP do_fileremove(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    SEXP f, ans;
    int i, n;
    checkArity(op, args);
    f = CAR(args);
    if (!isString(f))
        errorcall(call, "invalid first filename");
    n = length(f);
    PROTECT(ans = allocVector(LGLSXP, n));
    for (i = 0; i < n; i++) {
    if (STRING(f)[i] != R_NilValue)
        LOGICAL(ans)[i] =
        (remove(R_ExpandFileName(CHAR(STRING(f)[i]))) == 0);
    }
    UNPROTECT(1);
    return ans;
}

#ifndef Macintosh
#include <sys/types.h>
#endif
#if HAVE_DIRENT_H
# include <dirent.h>
#elif HAVE_SYS_NDIR_H
# include <sys/ndir.h>
#elif HAVE_SYS_DIR_H
# include <sys/dir.h>
#elif HAVE_NDIR_H
# include <ndir.h>
#endif
#ifdef HAVE_REGCOMP
#include "regex.h"
#endif

#define DIRNAMEBUFSIZE 256

static SEXP filename(char *dir, char *file)
{
    SEXP ans;
    if (dir) {
    ans = allocString(strlen(dir) + strlen(R_FileSep) + strlen(file));
    sprintf(CHAR(ans), "%s%s%s", dir, R_FileSep, file);
    }
    else {
    ans = allocString(strlen(file));
    sprintf(CHAR(ans), "%s", file);
    }
    return ans;
}

SEXP do_listfiles(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    SEXP d, p, ans;
    DIR *dir;
    struct dirent *de;
    int allfiles, fullnames, count, pattern;
    int i, ndir;
    char *dnp, dirname[DIRNAMEBUFSIZE];
#ifdef HAVE_REGCOMP
    regex_t reg;
#endif
    checkArity(op, args);
    d = CAR(args);  args = CDR(args);
    if (!isString(d))
    errorcall(call, "invalid directory argument");
    p = CAR(args);  args = CDR(args);
    pattern = 0;
    if (isString(p) && length(p) >= 1 && STRING(p)[0] != R_NilValue)
    pattern = 1;
    else if (!isNull(p) && !(isString(p) && length(p) < 1))
    errorcall(call, "invalid pattern argument");
    allfiles = asLogical(CAR(args)); args = CDR(args);
    fullnames = asLogical(CAR(args));
    ndir = length(d);
#ifdef HAVE_REGCOMP
    if (pattern && regcomp(&reg, CHAR(STRING(p)[0]), REG_EXTENDED))
        errorcall(call, "invalid pattern regular expression");
#else
    warning("pattern specification is not available in \"list.files\"");
#endif
    count = 0;
    for (i = 0; i < ndir ; i++) {
    dnp = R_ExpandFileName(CHAR(STRING(d)[i]));
    if (strlen(dnp) >= DIRNAMEBUFSIZE)
        error("directory/folder path name too long");
    strcpy(dirname, dnp);
    if ((dir = opendir(dirname)) == NULL)
        errorcall(call, "invalid directory/folder name");
    while ((de = readdir(dir))) {
        if (allfiles || !R_HiddenFile(de->d_name)) {
#ifdef HAVE_REGCOMP
        if (pattern) {
            if(regexec(&reg, de->d_name, 0, NULL, 0) == 0)
            count++;
        }
        else
#endif
          count++;
        }
    }
    closedir(dir);
    }
    PROTECT(ans = allocVector(STRSXP, count));
    count = 0;
    for (i = 0; i < ndir ; i++) {
    dnp = R_ExpandFileName(CHAR(STRING(d)[i]));
    if (strlen(dnp) >= DIRNAMEBUFSIZE)
        error("directory/folder path name too long");
    strcpy(dirname, dnp);
    if (fullnames)
        dnp = dirname;
    else
        dnp = NULL;
    if ((dir = opendir(dirname)) == NULL)
        errorcall(call, "invalid directory/folder name");
    while ((de = readdir(dir))) {
        if (allfiles || !R_HiddenFile(de->d_name)) {
#ifdef HAVE_REGCOMP
        if (pattern) {
            if (regexec(&reg, de->d_name, 0, NULL, 0) == 0)
            STRING(ans)[count++] = filename(dnp, de->d_name);
        }
        else
#endif
          STRING(ans)[count++] = filename(dnp, de->d_name);
        }
    }
    closedir(dir);
    }
#ifdef HAVE_REGCOMP
    if (pattern)
    regfree(&reg);
#endif
    ssort(STRING(ans), count);
    UNPROTECT(1);
    return ans;
}

SEXP do_Rhome(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    char *path;
    checkArity(op, args);
    if (!(path = R_HomeDir()))
    error("unable to determine R home location");
    return mkString(path);
}

SEXP do_fileexists(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    SEXP file, ans;
    int i, nfile;
    checkArity(op, args);
    if (!isString(file = CAR(args)))
        errorcall(call, "invalid file argument");
    nfile = length(file);
    ans = allocVector(LGLSXP, nfile);
    for(i = 0; i < nfile; i++) {
    LOGICAL(ans)[i] = 0;
        if (STRING(file)[i] != R_NilValue)
        LOGICAL(ans)[i] = R_FileExists(CHAR(STRING(file)[i]));
    }
    return ans;
}

static int filbuf(char *buf, FILE *fp)
{
    int c;
    while((c = fgetc(fp)) != EOF) {
    if (c == '\n' || c == '\r') {
        *buf = '\0';
        return 1;
    }
    *buf++ = c;
    }
    return 0;
}

SEXP do_indexsearch(SEXP call, SEXP op, SEXP args, SEXP rho)
{
/* index.search(topic, path, file, .Platform$file.sep, type) */
    SEXP topic, path, indexname, sep, type;
    char linebuf[256], topicbuf[256], *p, ctype[256];
    int i, npath, ltopicbuf;
    FILE *fp;

    checkArity(op, args);
    topic = CAR(args); args = CDR(args);
    if(!isString(topic) || length(topic) < 1 || isNull(topic))
    error("invalid \"topic\" argument");
    path = CAR(args); args = CDR(args);
    if(!isString(path) || length(path) < 1 || isNull(path))
    error("invalid \"path\" argument");
    indexname = CAR(args); args = CDR(args);
    if(!isString(indexname) || length(indexname) < 1 || isNull(indexname))
    error("invalid \"indexname\" argument");
    sep = CAR(args); args = CDR(args);
    if(!isString(sep) || length(sep) < 1 || isNull(sep))
    error("invalid \"sep\" argument");
    type = CAR(args);
    if(!isString(type) || length(type) < 1 || isNull(type))
    error("invalid \"type\" argument");
    strcpy(ctype, CHAR(STRING(type)[0]));
    sprintf(topicbuf, "%s\t", CHAR(STRING(topic)[0]));
    ltopicbuf = strlen(topicbuf);
    npath = length(path);
    for (i = 0; i < npath; i++) {
    sprintf(linebuf, "%s%s%s%s%s",
        CHAR(STRING(path)[i]),
        CHAR(STRING(sep)[0]),
        "help", CHAR(STRING(sep)[0]),
        CHAR(STRING(indexname)[0]));
    if ((fp = fopen(linebuf, "rt")) != NULL){
        while (filbuf(linebuf, fp)) {
        if(strncmp(linebuf, topicbuf, ltopicbuf) == 0) {
            p = &linebuf[ltopicbuf - 1];
            while(isspace((int)*p)) p++;
            fclose(fp);
            if (!strcmp(ctype, "html"))
            sprintf(topicbuf, "%s%s%s%s%s%s",
                CHAR(STRING(path)[i]),
                CHAR(STRING(sep)[0]),
                "html", CHAR(STRING(sep)[0]),
                p, ".html");
            else if (!strcmp(ctype, "R-ex"))
            sprintf(topicbuf, "%s%s%s%s%s%s",
                CHAR(STRING(path)[i]),
                CHAR(STRING(sep)[0]),
                "R-ex", CHAR(STRING(sep)[0]),
                p, ".R");
            else if (!strcmp(ctype, "latex"))
            sprintf(topicbuf, "%s%s%s%s%s%s",
                CHAR(STRING(path)[i]),
                CHAR(STRING(sep)[0]),
                "latex", CHAR(STRING(sep)[0]),
                p, ".tex");
            else /* type = "help" */
            sprintf(topicbuf, "%s%s%s%s%s",
                CHAR(STRING(path)[i]),
                CHAR(STRING(sep)[0]),
                ctype, CHAR(STRING(sep)[0]), p);
            return mkString(topicbuf);
        }
        }
        fclose(fp);
    }
    }
    return mkString("");
}

#define CHOOSEBUFSIZE 1024

SEXP do_filechoose(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    int new, len;
    char buf[CHOOSEBUFSIZE];
    checkArity(op, args);
    new = asLogical(CAR(args));
    if ((len = R_ChooseFile(new, buf, CHOOSEBUFSIZE)) == 0)
    error("file choice cancelled");
    if (len >= CHOOSEBUFSIZE - 1)
    errorcall(call, "file name too long");
    return mkString(R_ExpandFileName(buf));
}