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#include "cache.h"
#include "walker.h"
#include "commit.h"
#include "tree.h"
#include "tree-walk.h"
#include "tag.h"
#include "blob.h"
#include "refs.h"

static unsigned char current_commit_sha1[20];

void walker_say(struct walker *walker, const char *fmt, const char *hex)
{
if (walker->get_verbosely)
fprintf(stderr, fmt, hex);
}

static void report_missing(const struct object *obj)
{
char missing_hex[41];
strcpy(missing_hex, sha1_to_hex(obj->sha1));
fprintf(stderr, "Cannot obtain needed %s %s\n",
obj->type ? typename(obj->type): "object", missing_hex);
if (!is_null_sha1(current_commit_sha1))
fprintf(stderr, "while processing commit %s.\n",
sha1_to_hex(current_commit_sha1));
}

static int process(struct walker *walker, struct object *obj);

static int process_tree(struct walker *walker, struct tree *tree)
{
struct tree_desc desc;
struct name_entry entry;

if (parse_tree(tree))
return -1;

init_tree_desc(&desc, tree->buffer, tree->size);
while (tree_entry(&desc, &entry)) {
struct object *obj = NULL;

/* submodule commits are not stored in the superproject */
if (S_ISGITLINK(entry.mode))
continue;
if (S_ISDIR(entry.mode)) {
struct tree *tree = lookup_tree(entry.sha1);
if (tree)
obj = &tree->object;
}
else {
struct blob *blob = lookup_blob(entry.sha1);
if (blob)
obj = &blob->object;
}
if (!obj || process(walker, obj))
return -1;
}
free_tree_buffer(tree);
return 0;
}

/* Remember to update object flag allocation in object.h */
#define COMPLETE (1U << 0)
#define SEEN (1U << 1)
#define TO_SCAN (1U << 2)

static struct commit_list *complete = NULL;

static int process_commit(struct walker *walker, struct commit *commit)
{
if (parse_commit(commit))
return -1;

while (complete && complete->item->date >= commit->date) {
pop_most_recent_commit(&complete, COMPLETE);
}

if (commit->object.flags & COMPLETE)
return 0;

hashcpy(current_commit_sha1, commit->object.sha1);

walker_say(walker, "walk %s\n", sha1_to_hex(commit->object.sha1));

if (walker->get_tree) {
if (process(walker, &commit->tree->object))
return -1;
if (!walker->get_all)
walker->get_tree = 0;
}
if (walker->get_history) {
struct commit_list *parents = commit->parents;
for (; parents; parents = parents->next) {
if (process(walker, &parents->item->object))
return -1;
}
}
return 0;
}

static int process_tag(struct walker *walker, struct tag *tag)
{
if (parse_tag(tag))
return -1;
return process(walker, tag->tagged);
}

static struct object_list *process_queue = NULL;
static struct object_list **process_queue_end = &process_queue;

static int process_object(struct walker *walker, struct object *obj)
{
if (obj->type == OBJ_COMMIT) {
if (process_commit(walker, (struct commit *)obj))
return -1;
return 0;
}
if (obj->type == OBJ_TREE) {
if (process_tree(walker, (struct tree *)obj))
return -1;
return 0;
}
if (obj->type == OBJ_BLOB) {
return 0;
}
if (obj->type == OBJ_TAG) {
if (process_tag(walker, (struct tag *)obj))
return -1;
return 0;
}
return error("Unable to determine requirements "
"of type %s for %s",
typename(obj->type), sha1_to_hex(obj->sha1));
}

static int process(struct walker *walker, struct object *obj)
{
if (obj->flags & SEEN)
return 0;
obj->flags |= SEEN;

if (has_sha1_file(obj->sha1)) {
/* We already have it, so we should scan it now. */
obj->flags |= TO_SCAN;
}
else {
if (obj->flags & COMPLETE)
return 0;
walker->prefetch(walker, obj->sha1);
}

object_list_insert(obj, process_queue_end);
process_queue_end = &(*process_queue_end)->next;
return 0;
}

static int loop(struct walker *walker)
{
struct object_list *elem;

while (process_queue) {
struct object *obj = process_queue->item;
elem = process_queue;
process_queue = elem->next;
free(elem);
if (!process_queue)
process_queue_end = &process_queue;

/* If we are not scanning this object, we placed it in
* the queue because we needed to fetch it first.
*/
if (! (obj->flags & TO_SCAN)) {
if (walker->fetch(walker, obj->sha1)) {
report_missing(obj);
return -1;
}
}
if (!obj->type)
parse_object(obj->sha1);
if (process_object(walker, obj))
return -1;
}
return 0;
}

static int interpret_target(struct walker *walker, char *target, unsigned char *sha1)
{
if (!get_sha1_hex(target, sha1))
return 0;
if (!check_refname_format(target, 0)) {
struct ref *ref = alloc_ref(target);
if (!walker->fetch_ref(walker, ref)) {
hashcpy(sha1, ref->old_sha1);
free(ref);
return 0;
}
free(ref);
}
return -1;
}

static int mark_complete(const char *path, const unsigned char *sha1, int flag, void *cb_data)
{
struct commit *commit = lookup_commit_reference_gently(sha1, 1);
if (commit) {
commit->object.flags |= COMPLETE;
commit_list_insert_by_date(commit, &complete);
}
return 0;
}

int walker_targets_stdin(char ***target, const char ***write_ref)
{
int targets = 0, targets_alloc = 0;
struct strbuf buf = STRBUF_INIT;
*target = NULL; *write_ref = NULL;
while (1) {
char *rf_one = NULL;
char *tg_one;

if (strbuf_getline(&buf, stdin, '\n') == EOF)
break;
tg_one = buf.buf;
rf_one = strchr(tg_one, '\t');
if (rf_one)
*rf_one++ = 0;

if (targets >= targets_alloc) {
targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
*target = xrealloc(*target, targets_alloc * sizeof(**target));
*write_ref = xrealloc(*write_ref, targets_alloc * sizeof(**write_ref));
}
(*target)[targets] = xstrdup(tg_one);
(*write_ref)[targets] = rf_one ? xstrdup(rf_one) : NULL;
targets++;
}
strbuf_release(&buf);
return targets;
}

void walker_targets_free(int targets, char **target, const char **write_ref)
{
while (targets--) {
free(target[targets]);
if (write_ref)
free((char *) write_ref[targets]);
}
}

int walker_fetch(struct walker *walker, int targets, char **target,
const char **write_ref, const char *write_ref_log_details)
{
struct ref_lock **lock = xcalloc(targets, sizeof(struct ref_lock *));
unsigned char *sha1 = xmalloc(targets * 20);
char *msg;
int ret;
int i;

save_commit_buffer = 0;

for (i = 0; i < targets; i++) {
if (!write_ref || !write_ref[i])
continue;

lock[i] = lock_ref_sha1(write_ref[i], NULL);
if (!lock[i]) {
error("Can't lock ref %s", write_ref[i]);
goto unlock_and_fail;
}
}

if (!walker->get_recover)
for_each_ref(mark_complete, NULL);

for (i = 0; i < targets; i++) {
if (interpret_target(walker, target[i], &sha1[20 * i])) {
error("Could not interpret response from server '%s' as something to pull", target[i]);
goto unlock_and_fail;
}
if (process(walker, lookup_unknown_object(&sha1[20 * i])))
goto unlock_and_fail;
}

if (loop(walker))
goto unlock_and_fail;

if (write_ref_log_details) {
msg = xmalloc(strlen(write_ref_log_details) + 12);
sprintf(msg, "fetch from %s", write_ref_log_details);
} else {
msg = NULL;
}
for (i = 0; i < targets; i++) {
if (!write_ref || !write_ref[i])
continue;
ret = write_ref_sha1(lock[i], &sha1[20 * i], msg ? msg : "fetch (unknown)");
lock[i] = NULL;
if (ret)
goto unlock_and_fail;
}
free(msg);

return 0;

unlock_and_fail:
for (i = 0; i < targets; i++)
if (lock[i])
unlock_ref(lock[i]);

return -1;
}

void walker_free(struct walker *walker)
{
walker->cleanup(walker);
free(walker);
}
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