#include "git-compat-util.h"
#include "hash.h"
#include "oidmap.h"

static int oidmap_neq(const void *hashmap_cmp_fn_data UNUSED,
		      const struct hashmap_entry *e1,
		      const struct hashmap_entry *e2,
		      const void *keydata)
{
	const struct oidmap_entry *a, *b;

	a = container_of(e1, const struct oidmap_entry, internal_entry);
	b = container_of(e2, const struct oidmap_entry, internal_entry);

	if (keydata)
		return !oideq(&a->oid, (const struct object_id *) keydata);
	return !oideq(&a->oid, &b->oid);
}

void oidmap_init(struct oidmap *map, size_t initial_size)
{
	hashmap_init(&map->map, oidmap_neq, NULL, initial_size);
}

void oidmap_clear(struct oidmap *map, int free_entries)
{
	oidmap_clear_with_free(map,
		free_entries ? free : NULL);
}

void oidmap_clear_with_free(struct oidmap *map,
			    oidmap_free_fn free_fn)
{
	struct hashmap_iter iter;
	struct hashmap_entry *e;

	if (!map || !map->map.cmpfn)
		return;

	hashmap_iter_init(&map->map, &iter);
	while ((e = hashmap_iter_next(&iter))) {
		struct oidmap_entry *entry =
			container_of(e, struct oidmap_entry, internal_entry);
		if (free_fn)
			free_fn(entry);
	}

	hashmap_clear(&map->map);
}

void *oidmap_get(const struct oidmap *map, const struct object_id *key)
{
	if (!map->map.cmpfn)
		return NULL;

	return hashmap_get_from_hash(&map->map, oidhash(key), key);
}

void *oidmap_remove(struct oidmap *map, const struct object_id *key)
{
	struct hashmap_entry entry;

	if (!map->map.cmpfn)
		oidmap_init(map, 0);

	hashmap_entry_init(&entry, oidhash(key));
	return hashmap_remove(&map->map, &entry, key);
}

void *oidmap_put(struct oidmap *map, void *entry)
{
	struct oidmap_entry *to_put = entry;

	if (!map->map.cmpfn)
		oidmap_init(map, 0);

	hashmap_entry_init(&to_put->internal_entry, oidhash(&to_put->oid));
	return hashmap_put(&map->map, &to_put->internal_entry);
}