#include "geef.h"
#include "repository.h"
#include "object.h"
#include "oid.h"
#include <string.h>
#include <git2.h>

void geef_object_free(ErlNifEnv *env, void *cd)
{
	geef_object *obj = (geef_object *) cd;
	enif_release_resource(obj->repo);
	git_object_free(obj->obj);
}

ERL_NIF_TERM geef_object_type2atom(const git_otype type)
{
	switch(type) {
	case GIT_OBJ_COMMIT:
		return atoms.commit;
	case GIT_OBJ_TREE:
		return atoms.tree;
	case GIT_OBJ_BLOB:
		return atoms.blob;
	case GIT_OBJ_TAG:
		return atoms.tag;
	default:
		return atoms.error;
	}
}

ERL_NIF_TERM
geef_object_lookup(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
{
	geef_repository *repo;
	ErlNifBinary bin;
	git_oid id;
	geef_object *obj;
	ERL_NIF_TERM term_obj;

	if (!enif_get_resource(env, argv[0], geef_repository_type, (void **) &repo))
		return enif_make_badarg(env);

	if (!enif_inspect_binary(env, argv[1], &bin))
		return enif_make_badarg(env);

	if (bin.size < GIT_OID_RAWSZ)
		return enif_make_badarg(env);

	git_oid_fromraw(&id, bin.data);

	obj = enif_alloc_resource(geef_object_type, sizeof(geef_object));
	if (git_object_lookup(&obj->obj, repo->repo, &id, GIT_OBJ_ANY) < 0) {
		enif_release_resource(obj);
		return geef_error(env);
	}


	term_obj = enif_make_resource(env, obj);
	enif_release_resource(obj);

	obj->repo = repo;
	enif_keep_resource(repo);

	return enif_make_tuple3(env, atoms.ok, geef_object_type2atom(git_object_type(obj->obj)), term_obj);
}

ERL_NIF_TERM
geef_object_id(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
{
	ErlNifBinary bin;
	const git_oid *id;
	geef_object *obj;

	if (!enif_get_resource(env, argv[0], geef_object_type, (void **) &obj))
		return enif_make_badarg(env);

	id = git_object_id(obj->obj);

	if (geef_oid_bin(&bin, id) < 0)
		return atoms.error;

	return enif_make_tuple2(env, atoms.ok, enif_make_binary(env, &bin));
}