/*  Copyright 1986-1992 Emmet P. Gray.
 *  Copyright 1996-2002,2004,2007-2009 Alain Knaff.
 *  This file is part of mtools.
 *
 *  Mtools 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  Mtools 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 Mtools.  If not, see <http://www.gnu.org/licenses/>.
 *
 * mdir.c:
 * Display an MSDOS directory
 */

#include "sysincludes.h"
#include "mtools.h"
#include "file.h"
#include "mainloop.h"
#include "fs.h"
#include "file_name.h"

#ifdef TEST_SIZE
#include "fsP.h"
#endif

static int recursive;
static int wide;
static int all;
static int concise;
static int fast=0;
#if 0
static int testmode = 0;
#endif
static const char *dirPath;
static char *dynDirPath;
static char currentDrive;
static Stream_t *currentDir;

static int filesInDir; /* files in current dir */
static int filesOnDrive; /* files on drive */

static int dirsOnDrive; /* number of listed directories on this drive */

static int debug = 0; /* debug mode */

static mt_off_t bytesInDir;
static mt_off_t bytesOnDrive;
static Stream_t *RootDir;


static char mdir_shortname[4*12+1];
static char mdir_longname[4*MAX_VNAMELEN+1];


/*
 * Print an MSDOS directory date stamp.
 */
static inline void print_date(struct directory *dir)
{
	char year[5];
	char day[3];
	char month[3];
	const char *p;

	sprintf(year, "%04d", DOS_YEAR(dir));
	sprintf(day, "%02d", DOS_DAY(dir));
	sprintf(month, "%02d", DOS_MONTH(dir));

	for(p=mtools_date_string; *p; p++) {
		if(!strncasecmp(p, "yyyy", 4)) {
			printf("%04d", DOS_YEAR(dir));
			p+= 3;
			continue;
		} else if(!strncasecmp(p, "yy", 2)) {
			printf("%02d", DOS_YEAR(dir) % 100);
			p++;
			continue;
		} else if(!strncasecmp(p, "dd", 2)) {
			printf("%02d", DOS_DAY(dir));
			p++;
			continue;
		} else if(!strncasecmp(p, "mm", 2)) {
			printf("%02d", DOS_MONTH(dir));
			p++;
			continue;
		}
		putchar(*p);
	}
}

/*
 * Print an MSDOS directory time stamp.
 */
static inline void print_time(struct directory *dir)
{
	char am_pm;
	int hour = DOS_HOUR(dir);

	if(!mtools_twenty_four_hour_clock) {
		am_pm = (hour >= 12) ? 'p' : 'a';
		if (hour > 12)
			hour = hour - 12;
		if (hour == 0)
			hour = 12;
	} else
		am_pm = ' ';

	printf("%2d:%02d%c", hour, DOS_MINUTE(dir), am_pm);
}

/*
 * Return a number in dotted notation
 */
static const char *dotted_num(mt_off_t num, size_t width, char **buf)
{
	size_t len;
	register char *srcp, *dstp;
	size_t size;

	unsigned long numlo;
	unsigned long numhi;

	size = width + width;
	*buf = malloc(size+1);

	if (*buf == NULL)
		return "";

	/* Create the number in maximum width; make sure that the string
	 * length is not exceeded (in %6ld, the result can be longer than 6!)
	 */

	numlo = num % 1000000000;
	numhi = (unsigned long) (num / 1000000000);

	if(numhi && size > 9) {
		sprintf(*buf, "%.*lu%09lu", (int)(size-9), numhi, numlo);
	} else {
		sprintf(*buf, "%.*lu", (int) size, numlo);
	}

	for (srcp=*buf; srcp[1] != '\0'; ++srcp)
		if (srcp[0] == '0')
			srcp[0] = ' ';
		else
			break;

	len = strlen(*buf);
	srcp = (*buf)+len;
	dstp = (*buf)+len+1;

	for ( ; dstp >= (*buf)+4 && isdigit ((unsigned char)srcp[-1]); ) {
		srcp -= 3;  /* from here we copy three digits */
		dstp -= 4;  /* that's where we put these 3 digits */
	}

	/* now finally copy the 3-byte blocks to their new place */
	while (dstp < (*buf) + len) {
		dstp[0] = srcp[0];
		dstp[1] = srcp[1];
		dstp[2] = srcp[2];
		if (dstp + 3 < (*buf) + len)
			/* use spaces instead of dots: they please both
			 * Americans and Europeans */
			dstp[3] = ' ';
		srcp += 3;
		dstp += 4;
	}

	return (*buf) + len-width;
}

static inline int print_volume_label(Stream_t *Dir, char drive)
{
	Stream_t *Stream = GetFs(Dir);
	direntry_t entry;
	DeclareThis(Fs_t);
	char shortname[13];
	char longname[VBUFSIZE];
	int r;

	RootDir = OpenRoot(Stream);
	if(concise)
		return 0;

	/* find the volume label */

	initializeDirentry(&entry, RootDir);
	if((r=vfat_lookup(&entry, 0, 0, ACCEPT_LABEL | MATCH_ANY,
			  shortname, sizeof(shortname),
			  longname, sizeof(longname))) ) {
		if (r == -2) {
			/* I/O Error */
			return -1;
		}
		printf(" Volume in drive %c has no label", drive);
	} else if (*longname)
		printf(" Volume in drive %c is %s (abbr=%s)",
		       drive, longname, shortname);
	else
		printf(" Volume in drive %c is %s",
		       drive, shortname);
	if(getSerialized(This)) {
		unsigned long serial_number = getSerialNumber(This);
		printf("\n Volume Serial Number is %04lX-%04lX",
		       (serial_number >> 16) & 0xffff,
		       serial_number & 0xffff);
	}
	return 0;
}


static void printSummary(int files, mt_off_t bytes)
{
	if(!filesInDir)
		printf("No files\n");
	else {
		char *s1 = NULL;
		printf("      %3d file", files);
		if(files == 1)
			putchar(' ');
		else
			putchar('s');
		printf("       %s bytes\n",
		       dotted_num(bytes, 13, &s1));
		if(s1)
			free(s1);
	}
}

static void leaveDirectory(int haveError);

static void leaveDrive(int haveError)
{
	if(!currentDrive)
		return;
	leaveDirectory(haveError);
	if(!concise && !haveError) {

		if(dirsOnDrive > 1) {
			printf("\nTotal files listed:\n");
			printSummary(filesOnDrive, bytesOnDrive);
		}
		if(RootDir && !fast) {
			char *s1 = NULL;
			mt_off_t bytes = getfree(RootDir);
			if(bytes == -1) {
				fprintf(stderr, "Fat error\n");
				goto exit_1;
			}
			printf("                  %s bytes free\n\n",
			       dotted_num(bytes,17, &s1));
#ifdef TEST_SIZE
			((Fs_t*)GetFs(RootDir))->freeSpace = 0;
			bytes = getfree(RootDir);
			printf("                  %s bytes free\n\n",
			       dotted_num(bytes,17, &s1));
#endif
			if(s1)
				free(s1);
		}
	}
 exit_1:
	FREE(&RootDir);
	currentDrive = '\0';
}


static int enterDrive(Stream_t *Dir, char drive)
{
	int r;
	if(currentDrive == drive)
		return 0; /* still the same */

	leaveDrive(0);
	currentDrive = drive;

	r = print_volume_label(Dir, drive);
	if (r)
		return r;


	bytesOnDrive = 0;
	filesOnDrive = 0;
	dirsOnDrive = 0;
	return 0;
}

static const char *emptyString="<out-of-memory>";

static void leaveDirectory(int haveError)
{
	if(!currentDir)
		return;

	if (!haveError) {
		if(dirPath && dirPath != emptyString)
			free(dynDirPath);
		if(wide)
			putchar('\n');

		if(!concise)
			printSummary(filesInDir, bytesInDir);
	}
	FREE(&currentDir);
}

static int enterDirectory(Stream_t *Dir)
{
	int r;
	char drive;
	if(currentDir == Dir)
		return 0; /* still the same directory */

	leaveDirectory(0);

	drive = getDrive(Dir);
	r=enterDrive(Dir, drive);
	if(r)
		return r;
	currentDir = COPY(Dir);

	dynDirPath = getPwd(getDirentry(Dir));
	if(!dynDirPath)
		dirPath=emptyString;
	else {
		if(!dynDirPath[3] && concise)
			dynDirPath[2]='\0';
		dirPath=dynDirPath;
	}

	/* print directory title */
	if(!concise)
		printf("\nDirectory for %s\n", dirPath);

	if(!wide && !concise)
		printf("\n");

	dirsOnDrive++;
	bytesInDir = 0;
	filesInDir = 0;
	return 0;
}

static int list_file(direntry_t *entry, MainParam_t *mp UNUSEDP)
{
	unsigned long size;
	int i;
	int Case;
	int r;

	wchar_t ext[4];
	wchar_t name[9];
	doscp_t *cp;

	if(!all && (entry->dir.attr & 0x6))
		return 0;

	if(concise && isSpecialW(entry->name))
		return 0;

	r=enterDirectory(entry->Dir);
	if (r)
		return ERROR_ONE;
	if (wide) {
		if(filesInDir % 5)
			putchar(' ');
		else
			putchar('\n');
	}

	if(IS_DIR(entry)){
		size = 0;
	} else
		size = FILE_SIZE(&entry->dir);

	Case = entry->dir.Case;
	if(!(Case & (BASECASE | EXTCASE)) &&
	   mtools_ignore_short_case)
		Case |= BASECASE | EXTCASE;

	cp = GET_DOSCONVERT(entry->Dir);
	dos_to_wchar(cp, entry->dir.ext, ext, 3);
	if(Case & EXTCASE){
		for(i=0; i<3;i++)
			ext[i] = ch_towlower(ext[i]);
	}
	ext[3] = '\0';
	if (entry->dir.name[0] == '\x05') {
		dos_to_wchar(cp, "\xE5", name, 1);
		dos_to_wchar(cp, entry->dir.name+1, name+1, 7);
	} else {
		dos_to_wchar(cp, entry->dir.name, name, 8);
	}
	if(Case & BASECASE){
		for(i=0; i<8;i++)
			name[i] = ch_towlower(name[i]);
	}
	name[8]='\0';
	if(wide){
		if(IS_DIR(entry))
			printf("[%s]%*s", mdir_shortname,
			       (int) (15 - 2 - strlen(mdir_shortname)), "");
		else
			printf("%-15s", mdir_shortname);
	} else if(!concise) {
		char tmpBasename[4*8+1];
		char tmpExt[4*3+1];
		WCHAR_TO_NATIVE(name,tmpBasename,8);
		WCHAR_TO_NATIVE(ext,tmpExt,3);

		if (name[0] == ' ')
			printf("             ");
		else if(mtools_dotted_dir)
			printf("%-12s ", mdir_shortname);
		else
			printf("%s %s ", tmpBasename, tmpExt);
		/* is a subdirectory */
		if(IS_DIR(entry))
			printf("<DIR>    ");
		else
			printf(" %8ld", (long) size);
		printf(" ");
		print_date(&entry->dir);
		printf("  ");
		print_time(&entry->dir);

		if(debug)
			printf(" %s %d ", tmpBasename, START(&entry->dir));

		if(*mdir_longname)
			printf(" %s", mdir_longname);
		printf("\n");
	} else {
		char tmp[4*MAX_VNAMELEN+1];
		wchar_to_native(entry->name,tmp,
				MAX_VNAMELEN, sizeof(tmp));

		printf("%s/%s", dirPath, tmp);
		if(IS_DIR(entry))
			putchar('/');
		putchar('\n');
	}

	filesOnDrive++;
	filesInDir++;

	bytesOnDrive += size;
	bytesInDir += size;
	return GOT_ONE;
}

static int list_non_recurs_directory(direntry_t *entry, MainParam_t *mp)
{
	int r;
	/* list top-level directory
	 *   If this was matched by wildcard in the basename, list it as
	 *   file, otherwise, list it as directory */
	if (mp->basenameHasWildcard) {
		/* wildcard, list it as file */
		return list_file(entry, mp);
	} else {
		/* no wildcard, list it as directory */
		MainParam_t subMp;

		r=enterDirectory(mp->File);
		if(r)
			return ERROR_ONE;

		subMp = *mp;
		subMp.dirCallback = subMp.callback;
		return mp->loop(mp->File, &subMp, "*") | GOT_ONE;
	}
}


static int list_recurs_directory(direntry_t *entry UNUSEDP,
				 MainParam_t *mp)
{
	MainParam_t subMp;
	int ret;

	/* first list the files */
	subMp = *mp;
	subMp.lookupflags = ACCEPT_DIR | ACCEPT_PLAIN;
	subMp.dirCallback = list_file;
	subMp.callback = list_file;

	ret = mp->loop(mp->File, &subMp, "*");

	/* then list subdirectories */
	subMp = *mp;
	subMp.lookupflags = ACCEPT_DIR | NO_DOTS | NO_MSG | DO_OPEN;
	return ret | mp->loop(mp->File, &subMp, "*") | GOT_ONE;
}

#if 0
static int test_directory(direntry_t *entry, MainParam_t *mp)
{
	Stream_t *File=mp->File;
	Stream_t *Target;
	char errmsg[80];

	if ((Target = SimpleFileOpen(0, 0, "-",
				     O_WRONLY,
				     errmsg, 0, 0, 0))) {
		copyfile(File, Target);
		FREE(&Target);
	}
	return GOT_ONE;
}
#endif

static void usage(int ret) NORETURN;
static void usage(int ret)
{
		fprintf(stderr, "Mtools version %s, dated %s\n",
			mversion, mdate);
		fprintf(stderr, "Usage: %s: [-V] [-w] [-a] [-b] [-s] [-f] msdosdirectory\n",
			progname);
		fprintf(stderr,
			"       %s: [-V] [-w] [-a] [-b] [-s] [-f] msdosfile [msdosfiles...]\n",
			progname);
		exit(ret);
}

void mdir(int argc, char **argv, int type UNUSEDP) NORETURN;
void mdir(int argc, char **argv, int type UNUSEDP)
{
	int ret;
	MainParam_t mp;
	int c;
	const char *fakedArgv[] = { "." };

	concise = 0;
	recursive = 0;
	wide = all = 0;
					/* first argument */
	if(helpFlag(argc, argv))
		usage(0);
	while ((c = getopt(argc, argv, "i:waXbfds/h")) != EOF) {
		switch(c) {
			case 'i':
				set_cmd_line_image(optarg);
				break;
			case 'w':
				wide = 1;
				break;
			case 'a':
				all = 1;
				break;
			case 'b':
			case 'X':
				concise = 1;
				/*recursive = 1;*/
				break;
			case 's':
			case '/':
				recursive = 1;
				break;
			case 'f':
				fast = 1;
				break;
			case 'd':
				debug = 1;
				break;
#if 0
			case 't': /* test mode */
				testmode = 1;
				break;
#endif
			case 'h':
				usage(0);
			default:
				usage(1);
		}
	}

	/* fake an argument */
	if (optind == argc) {
		argv = (char **)fakedArgv;
		argc = 1;
		optind = 0;
	}

	init_mp(&mp);
	currentDrive = '\0';
	currentDir = 0;
	RootDir = 0;
	dirPath = 0;
#if 0
	if (testmode) {
		mp.lookupflags = ACCEPT_DIR | NO_DOTS;
		mp.dirCallback = test_directory;
	} else
#endif
	if(recursive) {
		mp.lookupflags = ACCEPT_DIR | ACCEPT_PLAIN | DO_OPEN_DIRS | NO_DOTS;
		mp.dirCallback = list_recurs_directory;
		mp.callback = list_file;
	} else {
		mp.lookupflags = ACCEPT_DIR | ACCEPT_PLAIN | DO_OPEN_DIRS;
		mp.dirCallback = list_non_recurs_directory;
		mp.callback = list_file;
	}
	mp.longname.data = mdir_longname;
	mp.longname.len = sizeof(mdir_longname);
	mp.shortname.data = mdir_shortname;
	mp.shortname.len = sizeof(mdir_shortname);
	ret=main_loop(&mp, argv + optind, argc - optind);
	leaveDirectory(ret);
	leaveDrive(ret);
	exit(ret);
}