/* See LICENSE file for copyright and license details. */
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <utime.h>

#include "../fs.h"
#include "../text.h"
#include "../util.h"

int cp_aflag = 0;
int cp_fflag = 0;
int cp_pflag = 0;
int cp_rflag = 0;
int cp_vflag = 0;
int cp_status = 0;
int cp_HLPflag = 'L';

int
cp(const char *s1, const char *s2, int depth)
{
	FILE *f1, *f2;
	char *ns1, *ns2;
	long size1, size2;
	struct dirent *d;
	struct stat st;
	struct utimbuf ut;
	char buf[PATH_MAX];
	DIR *dp;
	int r;

	if (cp_vflag)
		printf("'%s' -> '%s'\n", s1, s2);

	r = (cp_HLPflag == 'P' || (cp_HLPflag == 'H' && depth > 0)) ?
	    lstat(s1, &st) : stat(s1, &st);
	if (r < 0) {
		weprintf("%s %s:", (cp_HLPflag == 'P' ||
		         (cp_HLPflag == 'H' && depth > 0)) ? "lstat" : "stat", s1);
		cp_status = 1;
		return 0;
	}

	if (S_ISLNK(st.st_mode)) {
		if (readlink(s1, buf, sizeof(buf) - 1) >= 0) {
			if (cp_fflag)
				unlink(s2);
			if (symlink(buf, s2) != 0) {
				weprintf("%s: can't create '%s'\n", argv0, s2);
				cp_status = 1;
				return 0;
			}
		}
		goto preserve;
	}

	if (S_ISDIR(st.st_mode)) {
		if (!cp_rflag)
			eprintf("%s: is a directory\n", s1);

		if (!(dp = opendir(s1)))
			eprintf("opendir %s:", s1);

		if (mkdir(s2, st.st_mode) < 0 && errno != EEXIST)
			eprintf("mkdir %s:", s2);

		apathmax(&ns1, &size1);
		apathmax(&ns2, &size2);
		while ((d = readdir(dp))) {
			if (strcmp(d->d_name, ".") && strcmp(d->d_name, "..")) {
				r = snprintf(ns1, size1, "%s/%s", s1, d->d_name);
				if (r >= size1 || r < 0) {
					eprintf("%s/%s: filename too long\n",
						s1, d->d_name);
				}
				r = snprintf(ns2, size2, "%s/%s", s2, d->d_name);
				if (r >= size2 || r < 0) {
					eprintf("%s/%s: filename too long\n",
						s2, d->d_name);
				}
				fnck(ns1, ns2, cp, depth + 1);
			}
		}
		closedir(dp);
		free(ns1);
		free(ns2);
		goto preserve;
	}

	if (cp_aflag) {
		if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode) ||
		    S_ISSOCK(st.st_mode) || S_ISFIFO(st.st_mode)) {
			unlink(s2);
			if (mknod(s2, st.st_mode, st.st_rdev) < 0) {
				weprintf("%s: can't create '%s':", argv0, s2);
				cp_status = 1;
				return 0;
			}
			goto preserve;
		}
	}

	if (!(f1 = fopen(s1, "r"))) {
		weprintf("fopen %s:", s1);
		cp_status = 1;
		return 0;
	}

	if (!(f2 = fopen(s2, "w"))) {
		if (cp_fflag) {
			unlink(s2);
			if (!(f2 = fopen(s2, "w"))) {
				weprintf("fopen %s:", s2);
				cp_status = 1;
				return 0;
			}
		} else {
			weprintf("fopen %s:", s2);
			cp_status = 1;
			return 0;
		}
	}
	concat(f1, s1, f2, s2);
	/* preserve permissions by default */
	fchmod(fileno(f2), st.st_mode);
	fclose(f2);
	fclose(f1);

preserve:
	if (cp_aflag || cp_pflag) {
		if (!(S_ISLNK(st.st_mode))) {
			/* timestamp */
			ut.actime = st.st_atime;
			ut.modtime = st.st_mtime;
			utime(s2, &ut);
		}
		/* preserve owner ? */
		if (S_ISLNK(st.st_mode))
			r = lchown(s2, st.st_uid, st.st_gid);
		else
			r = chown(s2, st.st_uid, st.st_gid);
		if (r < 0) {
			weprintf("cp: can't preserve ownership of '%s':", s2);
			cp_status = 1;
		}
	}
	return 0;
}