/*	$OpenBSD: import.c,v 1.47 2006/06/01 20:01:31 joris Exp $	*/
/*
 * Copyright (c) 2006 Joris Vink <joris@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, 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 "includes.h"

#include "cvs.h"
#include "diff.h"
#include "log.h"
#include "proto.h"

int	cvs_import(int, char **);
void	cvs_import_local(struct cvs_file *);

static void import_new(struct cvs_file *);
static void import_update(struct cvs_file *);
static void import_tag(struct cvs_file *, RCSNUM *, RCSNUM *);
static char *import_get_rcsdiff(struct cvs_file *, RCSNUM *);

#define IMPORT_DEFAULT_BRANCH	"1.1.1"

static char *import_branch = IMPORT_DEFAULT_BRANCH;
static char *logmsg = NULL;
static char *vendor_tag = NULL;
static char *release_tag = NULL;

char *import_repository = NULL;
int import_conflicts = 0;

struct cvs_cmd cvs_cmd_import = {
	CVS_OP_IMPORT, CVS_REQ_IMPORT, "import",
	{ "im", "imp" },
	"Import sources into CVS, using vendor branches",
	"[-b vendor branch id] [-m message] repository vendor-tag release-tags",
	"b:m:",
	NULL,
	cvs_import
};

int
cvs_import(int argc, char **argv)
{
	int ch, l;
	char repo[MAXPATHLEN], *arg = ".";
	struct cvs_recursion cr;

	while ((ch = getopt(argc, argv, cvs_cmd_import.cmd_opts)) != -1) {
		switch (ch) {
		case 'b':
			import_branch = optarg;
			break;
		case 'm':
			logmsg = optarg;
			break;
		default:
			fatal("%s", cvs_cmd_import.cmd_synopsis);
			break;
		}
	}

	argc -= optind;
	argv += optind;

	if (argc < 3)
		fatal("%s", cvs_cmd_import.cmd_synopsis);

	if (logmsg == NULL)
		fatal("please specify a logmessage using -m for now");

	import_repository = argv[0];
	vendor_tag = argv[1];
	release_tag = argv[2];

	l = snprintf(repo, sizeof(repo), "%s/%s", current_cvsroot->cr_dir,
	    import_repository);
	if (l == -1 || l >= (int)sizeof(repo))
		fatal("cvs_import: overflow");

	if (mkdir(repo, 0755) == -1 && errno != EEXIST)
		fatal("cvs_import: %s: %s", repo, strerror(errno));

	cr.enterdir = NULL;
	cr.leavedir = NULL;
	cr.remote = NULL;
	cr.local = cvs_import_local;
	cr.flags = CR_RECURSE_DIRS;
	cvs_file_run(1, &arg, &cr);

	if (import_conflicts != 0) {
		cvs_printf("\n%d conflicts created by this import.\n\n",
		    import_conflicts);
		cvs_printf("Use the following command to help the merge:\n");
		cvs_printf("\topencvs checkout ");
		cvs_printf("-j%s:yesterday -j%s %s\n\n", vendor_tag,
		    vendor_tag, import_repository);
	} else {
		cvs_printf("\nNo conflicts created by this import.\n\n");
	}

	return (0);
}

void
cvs_import_local(struct cvs_file *cf)
{
	int l;
	int isnew;
	struct stat st;
	char repo[MAXPATHLEN];

	cvs_log(LP_TRACE, "cvs_import_local(%s)", cf->file_path);

	cvs_file_classify(cf, NULL, 0);

	if (cf->file_type == CVS_DIR) {
		if (!strcmp(cf->file_path, "."))
			return;

		if (verbosity > 1)
			cvs_log(LP_NOTICE, "Importing %s", cf->file_path);


		if (mkdir(cf->file_rpath, 0755) == -1 && errno != EEXIST)
			fatal("cvs_import_local: %s: %s", cf->file_rpath,
			    strerror(errno));

		return;
	}

	isnew = 1;
	l = snprintf(repo, sizeof(repo), "%s/%s/%s/%s%s",
	    current_cvsroot->cr_dir, cf->file_wd, CVS_PATH_ATTIC,
	    cf->file_name, RCS_FILE_EXT);
	if (l == -1 || l >= (int)sizeof(repo))
		fatal("import_new: overflow");

	if (cf->file_rcs != NULL || stat(repo, &st) != -1)
		isnew = 0;

	if (isnew == 1)
		import_new(cf);
	else
		import_update(cf);
}

static void
import_new(struct cvs_file *cf)
{
	BUF *bp;
	char *content;
	struct rcs_branch *brp;
	struct rcs_delta *rdp;
	RCSNUM *branch, *brev;

	cvs_log(LP_TRACE, "import_new(%s)", cf->file_name);

	if ((branch = rcsnum_parse(import_branch)) == NULL)
		fatal("import_new: failed to parse branch");

	if ((bp = cvs_buf_load(cf->file_path, BUF_AUTOEXT)) == NULL)
		fatal("import_new: failed to load %s", cf->file_path);

	cvs_buf_putc(bp, '\0');
	content = cvs_buf_release(bp);

	if ((brev = rcsnum_brtorev(branch)) == NULL)
		fatal("import_new: failed to get first branch revision");

	cf->repo_fd = open(cf->file_rpath, O_CREAT|O_TRUNC|O_WRONLY);
	if (cf->repo_fd < 0)
		fatal("import_new: %s: %s", cf->file_rpath, strerror(errno));

	cf->file_rcs = rcs_open(cf->file_rpath, cf->repo_fd, RCS_CREATE, 0444);
	if (cf->file_rcs == NULL)
		fatal("import_new: failed to create RCS file for %s",
		    cf->file_path);

	rcs_branch_set(cf->file_rcs, branch);

	if (rcs_sym_add(cf->file_rcs, vendor_tag, branch) == -1)
		fatal("import_new: failed to add release tag");

	if (rcs_sym_add(cf->file_rcs, release_tag, brev) == -1)
		fatal("import_new: failed to add vendor tag");

	if (rcs_rev_add(cf->file_rcs, brev, logmsg, -1, NULL) == -1)
		fatal("import_new: failed to create first branch revision");

	if (rcs_rev_add(cf->file_rcs, RCS_HEAD_REV, logmsg, -1, NULL) == -1)
		fatal("import_new: failed to create first revision");

	if ((rdp = rcs_findrev(cf->file_rcs, cf->file_rcs->rf_head)) == NULL)
		fatal("import_new: cannot find newly added revision");

	brp = xmalloc(sizeof(*brp));
	brp->rb_num = rcsnum_alloc();
	rcsnum_cpy(brev, brp->rb_num, 0);
	TAILQ_INSERT_TAIL(&(rdp->rd_branches), brp, rb_list);

	if (rcs_deltatext_set(cf->file_rcs,
	    cf->file_rcs->rf_head, content) == -1)
		fatal("import_new: failed to set deltatext");

	rcs_write(cf->file_rcs);
	cvs_printf("N %s/%s\n", import_repository, cf->file_path);

	xfree(content);
	rcsnum_free(branch);
	rcsnum_free(brev);
}

static void
import_update(struct cvs_file *cf)
{
	BUF *b1, *b2;
	char *d, b[16], branch[16];
	RCSNUM *newrev, *rev, *brev;

	cvs_log(LP_TRACE, "import_update(%s)", cf->file_path);

	rev = rcs_translate_tag(import_branch, cf->file_rcs);

	if ((brev = rcsnum_parse(import_branch)) == NULL)
		fatal("import_update: rcsnum_parse failed");

	if (rev != NULL) {
		if ((b1 = rcs_getrev(cf->file_rcs, rev)) == NULL)
			fatal("import_update: failed to grab revision");

		/* XXX */
		if ((b2 = cvs_buf_load(cf->file_path, BUF_AUTOEXT)) == NULL)
			fatal("import_update: failed to load %s",
			    cf->file_path);

		if (cvs_buf_differ(b1, b2) == 0) {
			import_tag(cf, brev, rev);
			cvs_printf("U %s/%s\n", import_repository,
			    cf->file_path);
			rcsnum_free(rev);
			rcsnum_free(brev);
			rcs_write(cf->file_rcs);
			return;
		}
	}

	if (cf->file_rcs->rf_branch != NULL)
		rcsnum_tostr(cf->file_rcs->rf_branch, branch, sizeof(branch));

	if (rev != NULL) {
		d = import_get_rcsdiff(cf, rev);
		newrev = rcsnum_inc(rev);
	} else {
		d = import_get_rcsdiff(cf, rcs_head_get(cf->file_rcs));
		newrev = rcsnum_brtorev(brev);
	}

	if (rcs_rev_add(cf->file_rcs, newrev, logmsg, -1, NULL) == -1)
		fatal("import_update: failed to add new revision");

	if (rcs_deltatext_set(cf->file_rcs, newrev, d) == -1)
		fatal("import_update: failed to set deltatext");
	xfree(d);

	import_tag(cf, brev, newrev);

	if (cf->file_rcs->rf_branch == NULL || cf->file_rcs->rf_inattic == 1 ||
	    strcmp(branch, import_branch)) {
		import_conflicts++;
		cvs_printf("C %s/%s\n", import_repository, cf->file_path);
	} else {
		cvs_printf("U %s/%s\n", import_repository, cf->file_path);
	}

	if (rev != NULL)
		rcsnum_free(rev);
	rcsnum_free(brev);

	rcs_write(cf->file_rcs);
}

static void
import_tag(struct cvs_file *cf, RCSNUM *branch, RCSNUM *newrev)
{
	char b[16];

	rcsnum_tostr(branch, b, sizeof(b));
	rcs_sym_add(cf->file_rcs, vendor_tag, branch);

	rcsnum_tostr(newrev, b, sizeof(b));
	rcs_sym_add(cf->file_rcs, release_tag, newrev);
}

static char *
import_get_rcsdiff(struct cvs_file *cf, RCSNUM *rev)
{
	char *delta, *p1, *p2;
	BUF *b1, *b2, *b3;

	/* XXX */
	if ((b1 = cvs_buf_load(cf->file_path, BUF_AUTOEXT)) == NULL)
		fatal("import_get_rcsdiff: failed loading %s", cf->file_path);

	if ((b2 = rcs_getrev(cf->file_rcs, rev)) == NULL)
		fatal("import_get_rcsdiff: failed loading revision");

	b3 = cvs_buf_alloc(128, BUF_AUTOEXT);

	(void)xasprintf(&p1, "%s/diff1.XXXXXXXXXX", cvs_tmpdir);
	cvs_buf_write_stmp(b1, p1, 0600, NULL);
	cvs_buf_free(b1);

	(void)xasprintf(&p2, "%s/diff2.XXXXXXXXXX", cvs_tmpdir);
	cvs_buf_write_stmp(b2, p2, 0600, NULL);
	cvs_buf_free(b2);

	diff_format = D_RCSDIFF;
	if (cvs_diffreg(p2, p1, b3) == D_ERROR)
		fatal("import_get_rcsdiff: failed to get RCS patch");

	cvs_buf_putc(b3, '\0');
	delta = cvs_buf_release(b3);
	return (delta);
}