/*
 * fontconfig/src/fcdir.c
 *
 * Copyright © 2000 Keith Packard
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of the author(s) not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  The authors make no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * THE AUTHOR(S) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#include "fcint.h"

#ifdef HAVE_DIRENT_H
#  include <dirent.h>
#endif

#if ENABLE_FONTATIONS
#  include "fontconfig/fcfontations.h"
#endif

#if ENABLE_FREETYPE
#include "fontconfig/fcfreetype.h"
#endif

FcBool
FcFileIsDir (const FcChar8 *file)
{
    struct stat statb;

    if (FcStat (file, &statb) != 0)
	return FcFalse;
    return S_ISDIR (statb.st_mode);
}

FcBool
FcFileIsLink (const FcChar8 *file)
{
#if HAVE_LSTAT
    struct stat statb;

    if (lstat ((const char *)file, &statb) != 0)
	return FcFalse;
    return S_ISLNK (statb.st_mode);
#else
    return FcFalse;
#endif
}

FcBool
FcFileIsFile (const FcChar8 *file)
{
    struct stat statb;

    if (FcStat (file, &statb) != 0)
	return FcFalse;
    return S_ISREG (statb.st_mode);
}

static FcBool
FcFileScanFontConfig (FcFontSet     *set,
                      const FcChar8 *file,
                      FcConfig      *config)
{
    int            i;
    FcBool         ret = FcTrue;
    int            old_nfont = set->nfont;
    const FcChar8 *sysroot = FcConfigGetSysRoot (config);

    if (FcDebug() & FC_DBG_SCAN) {
	printf ("\tScanning file %s...", file);
	fflush (stdout);
    }

    unsigned int (*query_function) (const FcChar8 *, unsigned int, FcBlanks *, int *, FcFontSet *) =
#if ENABLE_FONTATIONS && !defined(ENABLE_FREETYPE)
    FcFontationsQueryAll;
#elif ENABLE_FREETYPE
    FcFreeTypeQueryAll;
#endif

#if ENABLE_FONTATIONS
    if (getenv ("FC_FONTATIONS")) {
	query_function = FcFontationsQueryAll;
    }
#endif
    if (!query_function (file, -1, NULL, NULL, set))
	return FcFalse;

    if (FcDebug() & FC_DBG_SCAN)
	printf ("done\n");

    for (i = old_nfont; i < set->nfont; i++) {
	FcPattern *font = set->fonts[i];

	/*
	 * Get rid of sysroot here so that targeting scan rule may contains FC_FILE pattern
	 * and they should usually expect without sysroot.
	 */
	if (sysroot) {
	    size_t   len = strlen ((const char *)sysroot);
	    FcChar8 *f = NULL;

	    if (FcPatternObjectGetString (font, FC_FILE_OBJECT, 0, &f) == FcResultMatch &&
	        strncmp ((const char *)f, (const char *)sysroot, len) == 0) {
		FcChar8 *s = FcStrCopy (f);
		FcPatternObjectDel (font, FC_FILE_OBJECT);
		if (s[len] != '/')
		    len--;
		else if (s[len + 1] == '/')
		    len++;
		FcPatternObjectAddString (font, FC_FILE_OBJECT, &s[len]);
		FcStrFree (s);
	    }
	}

	/*
	 * Edit pattern with user-defined rules
	 */
	if (config && !FcConfigSubstitute (config, font, FcMatchScan))
	    ret = FcFalse;

	if (FcDebug() & FC_DBG_SCANV) {
	    printf ("Final font pattern:\n");
	    FcPatternPrint (font);
	}
    }

    return ret;
}

FcBool
FcFileScanConfig (FcFontSet     *set,
                  FcStrSet      *dirs,
                  const FcChar8 *file,
                  FcConfig      *config)
{
    if (FcFileIsDir (file)) {
	const FcChar8 *sysroot = FcConfigGetSysRoot (config);
	const FcChar8 *d = file;
	size_t         len;

	if (sysroot) {
	    len = strlen ((const char *)sysroot);
	    if (strncmp ((const char *)file, (const char *)sysroot, len) == 0) {
		if (file[len] != '/')
		    len--;
		else if (file[len + 1] == '/')
		    len++;
		d = &file[len];
	    }
	}
	return FcStrSetAdd (dirs, d);
    } else {
	if (set)
	    return FcFileScanFontConfig (set, file, config);
	else
	    return FcTrue;
    }
}

FcBool
FcFileScan (FcFontSet     *set,
            FcStrSet      *dirs,
            FcFileCache   *cache FC_UNUSED,
            FcBlanks      *blanks FC_UNUSED,
            const FcChar8 *file,
            FcBool         force FC_UNUSED)
{
    FcConfig *config;
    FcBool    ret;

    config = FcConfigReference (NULL);
    if (!config)
	return FcFalse;
    ret = FcFileScanConfig (set, dirs, file, config);
    FcConfigDestroy (config);

    return ret;
}

/*
 * Strcmp helper that takes pointers to pointers, copied from qsort(3) manpage
 */
static int
cmpstringp (const void *p1, const void *p2)
{
    return strcmp (*(char **)p1, *(char **)p2);
}

FcBool
FcDirScanConfig (FcFontSet     *set,
                 FcStrSet      *dirs,
                 const FcChar8 *dir,
                 FcBool         force, /* XXX unused */
                 FcConfig      *config)
{
    DIR           *d;
    struct dirent *e;
    FcStrSet      *files;
    FcChar8       *file_prefix = NULL, *s_dir = NULL;
    FcChar8       *base;
    const FcChar8 *sysroot = FcConfigGetSysRoot (config);
    FcBool         ret = FcTrue;
    int            i;

    if (!force)
	return FcFalse;

    if (!set && !dirs)
	return FcTrue;

    if (sysroot)
	s_dir = FcStrBuildFilename (sysroot, dir, NULL);
    else
	s_dir = FcStrCopy (dir);
    if (!s_dir) {
	ret = FcFalse;
	goto bail;
    }

    /* freed below */
    file_prefix = (FcChar8 *)malloc (strlen ((char *)s_dir) + 1 + FC_MAX_FILE_LEN + 1);
    if (!file_prefix) {
	ret = FcFalse;
	goto bail;
    }
    strcpy ((char *)file_prefix, (char *)s_dir);
    strcat ((char *)file_prefix, FC_DIR_SEPARATOR_S);
    base = file_prefix + strlen ((char *)file_prefix);

    if (FcDebug() & FC_DBG_SCAN)
	printf ("\tScanning dir %s\n", s_dir);

    d = opendir ((char *)s_dir);
    if (!d) {
	/* Don't complain about missing directories */
	if (errno != ENOENT)
	    ret = FcFalse;
	goto bail;
    }

    files = FcStrSetCreateEx (FCSS_ALLOW_DUPLICATES | FCSS_GROW_BY_64);
    if (!files) {
	ret = FcFalse;
	goto bail1;
    }
    while ((e = readdir (d))) {
	/* Ignore . and .. */
	if (e->d_name[0] == '.' &&
	    (e->d_name[1] == 0 ||
	     (e->d_name[1] == '.' && e->d_name[2] == 0)))
	    continue;
	if (strlen (e->d_name) < FC_MAX_FILE_LEN) {
	    strcpy ((char *)base, (char *)e->d_name);
	    if (!FcStrSetAdd (files, file_prefix)) {
		ret = FcFalse;
		goto bail2;
	    }
	}
    }

    /*
     * Sort files to make things prettier
     */
    if (files->num)
	qsort (files->strs, files->num, sizeof (FcChar8 *), cmpstringp);

    /*
     * Scan file files to build font patterns
     */
    for (i = 0; i < files->num; i++)
	FcFileScanConfig (set, dirs, files->strs[i], config);

bail2:
    FcStrSetDestroy (files);
bail1:
    closedir (d);
bail:
    if (s_dir)
	free (s_dir);
    if (file_prefix)
	free (file_prefix);

    return ret;
}

FcBool
FcDirScan (FcFontSet     *set,
           FcStrSet      *dirs,
           FcFileCache   *cache FC_UNUSED,
           FcBlanks      *blanks FC_UNUSED,
           const FcChar8 *dir,
           FcBool         force FC_UNUSED)
{
    FcConfig *config;
    FcBool    ret;

    if (cache || !force)
	return FcFalse;

    config = FcConfigReference (NULL);
    if (!config)
	return FcFalse;
    ret = FcDirScanConfig (set, dirs, dir, force, config);
    FcConfigDestroy (config);

    return ret;
}

/*
 * Scan the specified directory and construct a cache of its contents
 */
FcCache *
FcDirCacheScan (const FcChar8 *dir, FcConfig *config)
{
    FcStrSet      *dirs;
    FcFontSet     *set;
    FcCache       *cache = NULL;
    struct stat    dir_stat;
    const FcChar8 *sysroot = FcConfigGetSysRoot (config);
    FcChar8       *d;
#ifndef _WIN32
    int fd = -1;
#endif

    if (!FcConfigAcceptFilename (config, dir)) {
	if (FcDebug() & FC_DBG_CACHE)
	    printf ("%s: skipping, matching with deny list\n", dir);
	return NULL;
    }
    if (sysroot)
	d = FcStrBuildFilename (sysroot, dir, NULL);
    else
	d = FcStrCopy (dir);

    if (FcDebug() & FC_DBG_FONTSET)
	printf ("cache scan dir %s\n", d);

    if (FcStatChecksum (d, &dir_stat) < 0)
	goto bail;

    set = FcFontSetCreate();
    if (!set)
	goto bail;

    dirs = FcStrSetCreateEx (FCSS_GROW_BY_64);
    if (!dirs)
	goto bail1;

#ifndef _WIN32
    fd = FcDirCacheLock (dir, config);
#endif
    /*
     * Scan the dir
     */
    /* Do not pass sysroot here. FcDirScanConfig() do take care of it */
    if (!FcDirScanConfig (set, dirs, dir, FcTrue, config))
	goto bail2;

    /*
     * Build the cache object
     */
    cache = FcDirCacheBuild (set, dir, &dir_stat, dirs);
    if (!cache)
	goto bail2;

    /*
     * Write out the cache file, ignoring any troubles
     */
    FcDirCacheWrite (cache, config);

bail2:
#ifndef _WIN32
    FcDirCacheUnlock (fd);
#endif
    FcStrSetDestroy (dirs);
bail1:
    FcFontSetDestroy (set);
bail:
    FcStrFree (d);

    return cache;
}

FcCache *
FcDirCacheRescan (const FcChar8 *dir, FcConfig *config)
{
    FcCache       *cache;
    FcCache       *newp = NULL;
    struct stat    dir_stat;
    FcStrSet      *dirs;
    const FcChar8 *sysroot;
    FcChar8       *d = NULL;
#ifndef _WIN32
    int fd = -1;
#endif

    config = FcConfigReference (config);
    if (!config)
	return NULL;
    sysroot = FcConfigGetSysRoot (config);
    cache = FcDirCacheLoad (dir, config, NULL);
    if (!cache)
	goto bail;

    if (sysroot)
	d = FcStrBuildFilename (sysroot, dir, NULL);
    else
	d = FcStrCopy (dir);
    if (FcStatChecksum (d, &dir_stat) < 0)
	goto bail;
    dirs = FcStrSetCreateEx (FCSS_GROW_BY_64);
    if (!dirs)
	goto bail;

#ifndef _WIN32
    fd = FcDirCacheLock (dir, config);
#endif
    /*
     * Scan the dir
     */
    /* Do not pass sysroot here. FcDirScanConfig() do take care of it */
    if (!FcDirScanConfig (NULL, dirs, dir, FcTrue, config))
	goto bail1;
    /*
     * Rebuild the cache object
     */
    newp = FcDirCacheRebuild (cache, &dir_stat, dirs);
    if (!newp)
	goto bail1;
    FcDirCacheUnload (cache);
    /*
     * Write out the cache file, ignoring any troubles
     */
    FcDirCacheWrite (newp, config);

bail1:
#ifndef _WIN32
    FcDirCacheUnlock (fd);
#endif
    FcStrSetDestroy (dirs);
bail:
    if (d)
	FcStrFree (d);
    FcConfigDestroy (config);

    return newp;
}

/*
 * Read (or construct) the cache for a directory
 */
FcCache *
FcDirCacheRead (const FcChar8 *dir, FcBool force, FcConfig *config)
{
    FcCache *cache = NULL;

    config = FcConfigReference (config);
    /* Try to use existing cache file */
    if (!force)
	cache = FcDirCacheLoad (dir, config, NULL);

    /* Not using existing cache file, construct new cache */
    if (!cache) {
	FcDirCacheDeleteUUID (dir, config);
	cache = FcDirCacheScan (dir, config);
    }
    FcConfigDestroy (config);

    return cache;
}

FcBool
FcDirSave (FcFontSet *set FC_UNUSED, FcStrSet *dirs FC_UNUSED, const FcChar8 *dir FC_UNUSED)
{
    return FcFalse; /* XXX deprecated */
}
#define __fcdir__
#include "fcaliastail.h"
#undef __fcdir__
