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#include "cache.h"
#include "branch.h"
#include "refs.h"
#include "remote.h"
#include "commit.h"

struct tracking {
struct refspec spec;
char *src;
const char *remote;
int matches;
};

static int find_tracked_branch(struct remote *remote, void *priv)
{
struct tracking *tracking = priv;

if (!remote_find_tracking(remote, &tracking->spec)) {
if (++tracking->matches == 1) {
tracking->src = tracking->spec.src;
tracking->remote = remote->name;
} else {
free(tracking->spec.src);
if (tracking->src) {
free(tracking->src);
tracking->src = NULL;
}
}
tracking->spec.src = NULL;
}

return 0;
}

static int should_setup_rebase(const char *origin)
{
switch (autorebase) {
case AUTOREBASE_NEVER:
return 0;
case AUTOREBASE_LOCAL:
return origin == NULL;
case AUTOREBASE_REMOTE:
return origin != NULL;
case AUTOREBASE_ALWAYS:
return 1;
}
return 0;
}

void install_branch_config(int flag, const char *local, const char *origin, const char *remote)
{
const char *shortname = remote + 11;
int remote_is_branch = !prefixcmp(remote, "refs/heads/");
struct strbuf key = STRBUF_INIT;
int rebasing = should_setup_rebase(origin);

if (remote_is_branch
&& !strcmp(local, shortname)
&& !origin) {
warning("Not setting branch %s as its own upstream.",
local);
return;
}

strbuf_addf(&key, "branch.%s.remote", local);
git_config_set(key.buf, origin ? origin : ".");

strbuf_reset(&key);
strbuf_addf(&key, "branch.%s.merge", local);
git_config_set(key.buf, remote);

if (rebasing) {
strbuf_reset(&key);
strbuf_addf(&key, "branch.%s.rebase", local);
git_config_set(key.buf, "true");
}
strbuf_release(&key);

if (flag & BRANCH_CONFIG_VERBOSE) {
if (remote_is_branch && origin)
printf(rebasing ?
"Branch %s set up to track remote branch %s from %s by rebasing.\n" :
"Branch %s set up to track remote branch %s from %s.\n",
local, shortname, origin);
else if (remote_is_branch && !origin)
printf(rebasing ?
"Branch %s set up to track local branch %s by rebasing.\n" :
"Branch %s set up to track local branch %s.\n",
local, shortname);
else if (!remote_is_branch && origin)
printf(rebasing ?
"Branch %s set up to track remote ref %s by rebasing.\n" :
"Branch %s set up to track remote ref %s.\n",
local, remote);
else if (!remote_is_branch && !origin)
printf(rebasing ?
"Branch %s set up to track local ref %s by rebasing.\n" :
"Branch %s set up to track local ref %s.\n",
local, remote);
else
die("BUG: impossible combination of %d and %p",
remote_is_branch, origin);
}
}

/*
* This is called when new_ref is branched off of orig_ref, and tries
* to infer the settings for branch.<new_ref>.{remote,merge} from the
* config.
*/
static int setup_tracking(const char *new_ref, const char *orig_ref,
enum branch_track track, int quiet)
{
struct tracking tracking;
int config_flags = quiet ? 0 : BRANCH_CONFIG_VERBOSE;

if (strlen(new_ref) > 1024 - 7 - 7 - 1)
return error("Tracking not set up: name too long: %s",
new_ref);

memset(&tracking, 0, sizeof(tracking));
tracking.spec.dst = (char *)orig_ref;
if (for_each_remote(find_tracked_branch, &tracking))
return 1;

if (!tracking.matches)
switch (track) {
case BRANCH_TRACK_ALWAYS:
case BRANCH_TRACK_EXPLICIT:
case BRANCH_TRACK_OVERRIDE:
break;
default:
return 1;
}

if (tracking.matches > 1)
return error("Not tracking: ambiguous information for ref %s",
orig_ref);

install_branch_config(config_flags, new_ref, tracking.remote,
tracking.src ? tracking.src : orig_ref);

free(tracking.src);
return 0;
}

struct branch_desc_cb {
const char *config_name;
const char *value;
};

static int read_branch_desc_cb(const char *var, const char *value, void *cb)
{
struct branch_desc_cb *desc = cb;
if (strcmp(desc->config_name, var))
return 0;
free((char *)desc->value);
return git_config_string(&desc->value, var, value);
}

int read_branch_desc(struct strbuf *buf, const char *branch_name)
{
struct branch_desc_cb cb;
struct strbuf name = STRBUF_INIT;
strbuf_addf(&name, "branch.%s.description", branch_name);
cb.config_name = name.buf;
cb.value = NULL;
if (git_config(read_branch_desc_cb, &cb) < 0) {
strbuf_release(&name);
return -1;
}
if (cb.value)
strbuf_addstr(buf, cb.value);
strbuf_release(&name);
return 0;
}

int validate_new_branchname(const char *name, struct strbuf *ref,
int force, int attr_only)
{
if (strbuf_check_branch_ref(ref, name))
die("'%s' is not a valid branch name.", name);

if (!ref_exists(ref->buf))
return 0;
else if (!force && !attr_only)
die("A branch named '%s' already exists.", ref->buf + strlen("refs/heads/"));

if (!attr_only) {
const char *head;
unsigned char sha1[20];

head = resolve_ref_unsafe("HEAD", sha1, 0, NULL);
if (!is_bare_repository() && head && !strcmp(head, ref->buf))
die("Cannot force update the current branch.");
}
return 1;
}

void create_branch(const char *head,
const char *name, const char *start_name,
int force, int reflog, int clobber_head,
int quiet, enum branch_track track)
{
struct ref_lock *lock = NULL;
struct commit *commit;
unsigned char sha1[20];
char *real_ref, msg[PATH_MAX + 20];
struct strbuf ref = STRBUF_INIT;
int forcing = 0;
int dont_change_ref = 0;
int explicit_tracking = 0;

if (track == BRANCH_TRACK_EXPLICIT || track == BRANCH_TRACK_OVERRIDE)
explicit_tracking = 1;

if (validate_new_branchname(name, &ref, force,
track == BRANCH_TRACK_OVERRIDE ||
clobber_head)) {
if (!force)
dont_change_ref = 1;
else
forcing = 1;
}

real_ref = NULL;
if (get_sha1(start_name, sha1))
die("Not a valid object name: '%s'.", start_name);

switch (dwim_ref(start_name, strlen(start_name), sha1, &real_ref)) {
case 0:
/* Not branching from any existing branch */
if (explicit_tracking)
die("Cannot setup tracking information; starting point is not a branch.");
break;
case 1:
/* Unique completion -- good, only if it is a real branch */
if (prefixcmp(real_ref, "refs/heads/") &&
prefixcmp(real_ref, "refs/remotes/")) {
if (explicit_tracking)
die("Cannot setup tracking information; starting point is not a branch.");
else
real_ref = NULL;
}
break;
default:
die("Ambiguous object name: '%s'.", start_name);
break;
}

if ((commit = lookup_commit_reference(sha1)) == NULL)
die("Not a valid branch point: '%s'.", start_name);
hashcpy(sha1, commit->object.sha1);

if (!dont_change_ref) {
lock = lock_any_ref_for_update(ref.buf, NULL, 0);
if (!lock)
die_errno("Failed to lock ref for update");
}

if (reflog)
log_all_ref_updates = 1;

if (forcing)
snprintf(msg, sizeof msg, "branch: Reset to %s",
start_name);
else if (!dont_change_ref)
snprintf(msg, sizeof msg, "branch: Created from %s",
start_name);

if (real_ref && track)
setup_tracking(ref.buf+11, real_ref, track, quiet);

if (!dont_change_ref)
if (write_ref_sha1(lock, sha1, msg) < 0)
die_errno("Failed to write ref");

strbuf_release(&ref);
free(real_ref);
}

void remove_branch_state(void)
{
unlink(git_path("CHERRY_PICK_HEAD"));
unlink(git_path("REVERT_HEAD"));
unlink(git_path("MERGE_HEAD"));
unlink(git_path("MERGE_RR"));
unlink(git_path("MERGE_MSG"));
unlink(git_path("MERGE_MODE"));
unlink(git_path("SQUASH_MSG"));
}
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