#ifndef SHALLOW_H
#define SHALLOW_H

#include "commit.h"
#include "lockfile.h"
#include "object.h"
#include "repository.h"
#include "strbuf.h"

struct oid_array;
struct strvec;

void set_alternate_shallow_file(struct repository *r, const char *path, int override);
int register_shallow(struct repository *r, const struct object_id *oid);
int unregister_shallow(const struct object_id *oid);
int is_repository_shallow(struct repository *r);

/*
 * Lock for updating the $GIT_DIR/shallow file.
 *
 * Use `commit_shallow_file()` to commit an update, or
 * `rollback_shallow_file()` to roll it back. In either case, any
 * in-memory cached information about which commits are shallow will be
 * appropriately invalidated so that future operations reflect the new
 * state.
 */
struct shallow_lock {
	struct lock_file lock;
};
#define SHALLOW_LOCK_INIT { \
	.lock = LOCK_INIT, \
}

/* commit $GIT_DIR/shallow and reset stat-validity checks */
int commit_shallow_file(struct repository *r, struct shallow_lock *lk);
/* rollback $GIT_DIR/shallow and reset stat-validity checks */
void rollback_shallow_file(struct repository *r, struct shallow_lock *lk);

int get_shallows_depth(struct object_array *heads, struct object_array *shallows);
struct commit_list *get_shallow_commits(struct object_array *heads,
					struct object_array *shallows, int deepen_relative,
					int depth, int shallow_flag, int not_shallow_flag);
struct commit_list *get_shallow_commits_by_rev_list(struct strvec *argv,
						    int shallow_flag, int not_shallow_flag);
int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
			  const struct oid_array *extra);

void setup_alternate_shallow(struct shallow_lock *shallow_lock,
			     const char **alternate_shallow_file,
			     const struct oid_array *extra);

const char *setup_temporary_shallow(const struct oid_array *extra);

void advertise_shallow_grafts(int);

#define PRUNE_SHOW_ONLY 1
#define PRUNE_QUICK 2
void prune_shallow(unsigned options);

/*
 * Initialize with prepare_shallow_info() or zero-initialize (equivalent to
 * prepare_shallow_info with a NULL oid_array).
 */
struct shallow_info {
	struct oid_array *shallow;
	size_t *ours, nr_ours;
	size_t *theirs, nr_theirs;
	struct oid_array *ref;

	/* for receive-pack */
	uint32_t **used_shallow;
	int *need_reachability_test;
	int *reachable;
	int *shallow_ref;
	struct commit_stack commits;
};

void prepare_shallow_info(struct shallow_info *, struct oid_array *);
void clear_shallow_info(struct shallow_info *);
void remove_nonexistent_theirs_shallow(struct shallow_info *);
void assign_shallow_commits_to_refs(struct shallow_info *info,
				    uint32_t **used,
				    int *ref_status);
int delayed_reachability_test(struct shallow_info *si, int c);

extern struct trace_key trace_shallow;

#endif /* SHALLOW_H */