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#include "builtin.h"
#include "cache.h"
#include "parse-options.h"
#include "bisect.h"
#include "refs.h"
#include "dir.h"
#include "argv-array.h"
#include "run-command.h"

static GIT_PATH_FUNC(git_path_bisect_terms, "BISECT_TERMS")
static GIT_PATH_FUNC(git_path_bisect_expected_rev, "BISECT_EXPECTED_REV")
static GIT_PATH_FUNC(git_path_bisect_ancestors_ok, "BISECT_ANCESTORS_OK")
static GIT_PATH_FUNC(git_path_bisect_log, "BISECT_LOG")
static GIT_PATH_FUNC(git_path_bisect_start, "BISECT_START")
static GIT_PATH_FUNC(git_path_bisect_head, "BISECT_HEAD")

static const char * const git_bisect_helper_usage[] = {
	N_("git bisect--helper --next-all [--no-checkout]"),
	N_("git bisect--helper --write-terms <bad_term> <good_term>"),
	N_("git bisect--helper --bisect-clean-state"),
	N_("git bisect--helper --bisect-reset [<commit>]"),
	NULL
};

/*
 * Check whether the string `term` belongs to the set of strings
 * included in the variable arguments.
 */
LAST_ARG_MUST_BE_NULL
static int one_of(const char *term, ...)
{
	int res = 0;
	va_list matches;
	const char *match;

	va_start(matches, term);
	while (!res && (match = va_arg(matches, const char *)))
		res = !strcmp(term, match);
	va_end(matches);

	return res;
}

static int check_term_format(const char *term, const char *orig_term)
{
	int res;
	char *new_term = xstrfmt("refs/bisect/%s", term);

	res = check_refname_format(new_term, 0);
	free(new_term);

	if (res)
		return error(_("'%s' is not a valid term"), term);

	if (one_of(term, "help", "start", "skip", "next", "reset",
			"visualize", "replay", "log", "run", NULL))
		return error(_("can't use the builtin command '%s' as a term"), term);

	/*
	 * In theory, nothing prevents swapping completely good and bad,
	 * but this situation could be confusing and hasn't been tested
	 * enough. Forbid it for now.
	 */

	if ((strcmp(orig_term, "bad") && one_of(term, "bad", "new", NULL)) ||
		 (strcmp(orig_term, "good") && one_of(term, "good", "old", NULL)))
		return error(_("can't change the meaning of the term '%s'"), term);

	return 0;
}

static int write_terms(const char *bad, const char *good)
{
	FILE *fp;
	int res;

	if (!strcmp(bad, good))
		return error(_("please use two different terms"));

	if (check_term_format(bad, "bad") || check_term_format(good, "good"))
		return -1;

	fp = fopen(git_path_bisect_terms(), "w");
	if (!fp)
		return error_errno(_("could not open the file BISECT_TERMS"));

	res = fprintf(fp, "%s\n%s\n", bad, good);
	res |= fclose(fp);
	return (res < 0) ? -1 : 0;
}

static int bisect_reset(const char *commit)
{
	struct strbuf branch = STRBUF_INIT;

	if (!commit) {
		if (strbuf_read_file(&branch, git_path_bisect_start(), 0) < 1) {
			printf("We are not bisecting.\n");
			return 0;
		}
		strbuf_rtrim(&branch);
	} else {
		struct object_id oid;
		if (get_oid(commit, &oid))
			return error(_("'%s' is not a valid commit"), commit);
		strbuf_addstr(&branch, commit);
	}

	if (!file_exists(git_path_bisect_head())) {
		struct argv_array argv = ARGV_ARRAY_INIT;
		argv_array_pushl(&argv, "checkout", branch.buf, "--", NULL);
		if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
			error(_("Could not check out original HEAD '%s'. Try "
				"'git bisect reset <commit>'."), branch.buf);
			strbuf_release(&branch);
			argv_array_clear(&argv);
			return -1;
		}
		argv_array_clear(&argv);
	}

	strbuf_release(&branch);
	return bisect_clean_state();
}

static int is_expected_rev(const char *expected_hex)
{
	struct strbuf actual_hex = STRBUF_INIT;
	int res = 0;
	if (strbuf_read_file(&actual_hex, git_path_bisect_expected_rev(), 0) >= 0) {
		strbuf_trim(&actual_hex);
		res = !strcmp(actual_hex.buf, expected_hex);
	}
	strbuf_release(&actual_hex);
	return res;
}

static int check_expected_revs(const char **revs, int rev_nr)
{
	int i;

	for (i = 0; i < rev_nr; i++) {
		if (!is_expected_rev(revs[i])) {
			unlink_or_warn(git_path_bisect_ancestors_ok());
			unlink_or_warn(git_path_bisect_expected_rev());
			return 0;
		}
	}
	return 0;
}

int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
{
	enum {
		NEXT_ALL = 1,
		WRITE_TERMS,
		BISECT_CLEAN_STATE,
		BISECT_RESET,
		CHECK_EXPECTED_REVS
	} cmdmode = 0;
	int no_checkout = 0;
	struct option options[] = {
		OPT_CMDMODE(0, "next-all", &cmdmode,
			 N_("perform 'git bisect next'"), NEXT_ALL),
		OPT_CMDMODE(0, "write-terms", &cmdmode,
			 N_("write the terms to .git/BISECT_TERMS"), WRITE_TERMS),
		OPT_CMDMODE(0, "bisect-clean-state", &cmdmode,
			 N_("cleanup the bisection state"), BISECT_CLEAN_STATE),
		OPT_CMDMODE(0, "bisect-reset", &cmdmode,
			 N_("reset the bisection state"), BISECT_RESET),
		OPT_CMDMODE(0, "check-expected-revs", &cmdmode,
			 N_("check for expected revs"), CHECK_EXPECTED_REVS),
		OPT_BOOL(0, "no-checkout", &no_checkout,
			 N_("update BISECT_HEAD instead of checking out the current commit")),
		OPT_END()
	};

	argc = parse_options(argc, argv, prefix, options,
			     git_bisect_helper_usage, 0);

	if (!cmdmode)
		usage_with_options(git_bisect_helper_usage, options);

	switch (cmdmode) {
	case NEXT_ALL:
		return bisect_next_all(prefix, no_checkout);
	case WRITE_TERMS:
		if (argc != 2)
			die(_("--write-terms requires two arguments"));
		return write_terms(argv[0], argv[1]);
	case BISECT_CLEAN_STATE:
		if (argc != 0)
			die(_("--bisect-clean-state requires no arguments"));
		return bisect_clean_state();
	case BISECT_RESET:
		if (argc > 1)
			die(_("--bisect-reset requires either zero or one arguments"));
		return bisect_reset(argc ? argv[0] : NULL);
	case CHECK_EXPECTED_REVS:
		return check_expected_revs(argv, argc);
	default:
		die("BUG: unknown subcommand '%d'", cmdmode);
	}
	return 0;
}
debug log:

solving 711be75 ...
found 711be75 in https://public-inbox.org/git/01020156b73fe69f-6b734e3c-806c-431d-aa52-c96b3783f248-000000@eu-west-1.amazonses.com/ ||
	https://public-inbox.org/git/01020156a48145b7-a23cda02-9f19-4948-ae45-3ed899906044-000000@eu-west-1.amazonses.com/
found 9aba094 in https://public-inbox.org/git/01020156b73fe69a-13136cfb-4daa-4f5d-9b56-537adf2c6942-000000@eu-west-1.amazonses.com/ ||
	https://public-inbox.org/git/01020156a48145b6-e0aee940-119b-42b1-b0c4-80263426cd6e-000000@eu-west-1.amazonses.com/
found e50934c in https://public-inbox.org/git/01020156b73fe66f-bfad6316-39d4-4577-8f75-d1b4b2031263-000000@eu-west-1.amazonses.com/ ||
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found 30e1031 in https://public-inbox.org/git/01020156b73fe658-9c0fcb5f-3dc0-43e4-a1ac-2ef9de7b0ef6-000000@eu-west-1.amazonses.com/ ||
	https://public-inbox.org/git/010201567675ae4e-51e1afee-f0e1-4b71-b307-382de3660b9a-000000@eu-west-1.amazonses.com/ ||
	https://public-inbox.org/git/01020156a4814596-b3b6ff6c-ab4a-492e-baa0-801dadf09a4e-000000@eu-west-1.amazonses.com/
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found 8111c91 in https://public-inbox.org/git/010201567675adc1-17e27495-6b36-40d1-836d-814da029fcc4-000000@eu-west-1.amazonses.com/ ||
	https://public-inbox.org/git/01020157c38b19e0-81123fa5-5d9d-4f64-8f1b-ff336e83ebe4-000000@eu-west-1.amazonses.com/ ||
	https://public-inbox.org/git/01020156b73fe5b4-5dc768ab-b73b-4a21-ab92-018e2a7aa6f7-000000@eu-west-1.amazonses.com/ ||
	https://public-inbox.org/git/01020156a48144f8-c0e127c1-8cd9-4295-ac16-449a54315cac-000000@eu-west-1.amazonses.com/ ||
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	https://public-inbox.org/git/20160712223538.28508-2-pranit.bauva@gmail.com/ ||
	https://public-inbox.org/git/1464014928-31548-2-git-send-email-pranit.bauva@gmail.com/ ||
	https://public-inbox.org/git/20160524072124.2945-2-pranit.bauva@gmail.com/ ||
	https://public-inbox.org/git/1463031127-17718-2-git-send-email-pranit.bauva@gmail.com/ ||
	https://public-inbox.org/git/20160524184242.7518-2-pranit.bauva@gmail.com/
`3324229' ambiguous in git.git.git
3324229025300f7d7de600753c03af3ac22e2152 blob

found 3324229 in https://public-inbox.org/git/1375288117-1576-3-git-send-email-stefanbeller@googlemail.com/ ||
	https://public-inbox.org/git/1375530686-2309-3-git-send-email-stefanbeller@googlemail.com/
found e3884e3 in git.git.git
preparing index
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100644 e3884e3bb61c7dfb0cd97ddba7bd0558b44c6b8f	builtin/bisect--helper.c

applying [1/26] https://public-inbox.org/git/1375288117-1576-3-git-send-email-stefanbeller@googlemail.com/
diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index e3884e3..3324229 100644

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100644 3324229025300f7d7de600753c03af3ac22e2152	builtin/bisect--helper.c

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diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index 3324229..8111c91 100644

Checking patch builtin/bisect--helper.c...
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skipping https://public-inbox.org/git/01020157c38b19e0-81123fa5-5d9d-4f64-8f1b-ff336e83ebe4-000000@eu-west-1.amazonses.com/ for 8111c91
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skipping https://public-inbox.org/git/20160712223538.28508-2-pranit.bauva@gmail.com/ for 8111c91
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100644 8111c9149f5b95234f7144b1310f3d2bd5f6310e	builtin/bisect--helper.c

applying [3/26] https://public-inbox.org/git/01020157c38b1a74-ad2bcaff-0c92-4af4-9aa0-72d98f4945fc-000000@eu-west-1.amazonses.com/
diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index 8111c91..a47f1f2 100644

Checking patch builtin/bisect--helper.c...
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skipping https://public-inbox.org/git/01020156b73fe650-9ea6edbf-06df-45b3-ac65-848db7210cff-000000@eu-west-1.amazonses.com/ for a47f1f2
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100644 a47f1f2be28696de15a22a0e0a74370ba220d57f	builtin/bisect--helper.c

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diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index a47f1f2..30e1031 100644

Checking patch builtin/bisect--helper.c...
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100644 30e1031fbc97669aebfe2cfec5e59035d2f7cbb0	builtin/bisect--helper.c

applying [5/26] https://public-inbox.org/git/01020156b73fe66f-bfad6316-39d4-4577-8f75-d1b4b2031263-000000@eu-west-1.amazonses.com/
diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
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Checking patch builtin/bisect--helper.c...
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100644 e50934ca6f0e3e3c82f96d8b59e07f90d9358a24	builtin/bisect--helper.c

applying [6/26] https://public-inbox.org/git/01020156b73fe69a-13136cfb-4daa-4f5d-9b56-537adf2c6942-000000@eu-west-1.amazonses.com/
diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index e50934c..9aba094 100644

Checking patch builtin/bisect--helper.c...
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100644 9aba09400cd8b08dfdd30cb6bee6310b9dfc4da3	builtin/bisect--helper.c

applying [7/26] https://public-inbox.org/git/01020156b73fe69f-6b734e3c-806c-431d-aa52-c96b3783f248-000000@eu-west-1.amazonses.com/
diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index 9aba094..711be75 100644

Checking patch builtin/bisect--helper.c...
Applied patch builtin/bisect--helper.c cleanly.

skipping https://public-inbox.org/git/01020156a48145b7-a23cda02-9f19-4948-ae45-3ed899906044-000000@eu-west-1.amazonses.com/ for 711be75
index at:
100644 711be7542f82ae3cadfd9d3f2b75ab10c8d457dc	builtin/bisect--helper.c

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