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#ifndef COMMIT_GRAPH_H

#define COMMIT_GRAPH_H

#include "git-compat-util.h"

#include "object-store.h"

#include "oidset.h"

#define GIT_TEST_COMMIT_GRAPH "GIT_TEST_COMMIT_GRAPH"

#define GIT_TEST_COMMIT_GRAPH_DIE_ON_PARSE "GIT_TEST_COMMIT_GRAPH_DIE_ON_PARSE"

#define GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS "GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS"

/*

* This method is only used to enhance coverage of the commit-graph

* feature in the test suite with the GIT_TEST_COMMIT_GRAPH and

* GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS environment variables. Do not

* call this method oustide of a builtin, and only if you know what

* you are doing!

*/

void git_test_write_commit_graph_or_die(void);

struct commit;

struct bloom_filter_settings;

struct repository;

struct raw_object_store;

struct string_list;

char *get_commit_graph_filename(struct object_directory *odb);

char *get_commit_graph_chain_filename(struct object_directory *odb);

int open_commit_graph(const char *graph_file, int *fd, struct stat *st);

/*

* Given a commit struct, try to fill the commit struct info, including:

* 1. tree object

* 2. date

* 3. parents.

*

* Returns 1 if and only if the commit was found in the packed graph.

*

* See parse_commit_buffer() for the fallback after this call.

*/

int parse_commit_in_graph(struct repository *r, struct commit *item);

/*

* Look up the given commit ID in the commit-graph. This will only return a

* commit if the ID exists both in the graph and in the object database such

* that we don't return commits whose object has been pruned. Otherwise, this

* function returns `NULL`.

*/

struct commit *lookup_commit_in_graph(struct repository *repo, const struct object_id *id);

/*

* It is possible that we loaded commit contents from the commit buffer,

* but we also want to ensure the commit-graph content is correctly

* checked and filled. Fill the graph_pos and generation members of

* the given commit.

*/

void load_commit_graph_info(struct repository *r, struct commit *item);

struct tree *get_commit_tree_in_graph(struct repository *r,

const struct commit *c);

struct commit_graph {

const unsigned char *data;

size_t data_len;

unsigned char hash_len;

unsigned char num_chunks;

uint32_t num_commits;

struct object_id oid;

char *filename;

struct object_directory *odb;

uint32_t num_commits_in_base;

unsigned int read_generation_data;

struct commit_graph *base_graph;

const uint32_t *chunk_oid_fanout;

const unsigned char *chunk_oid_lookup;

const unsigned char *chunk_commit_data;

const unsigned char *chunk_generation_data;

const unsigned char *chunk_generation_data_overflow;

const unsigned char *chunk_extra_edges;

const unsigned char *chunk_base_graphs;

const unsigned char *chunk_bloom_indexes;

const unsigned char *chunk_bloom_data;

struct topo_level_slab *topo_levels;

struct bloom_filter_settings *bloom_filter_settings;

};

struct commit_graph *load_commit_graph_one_fd_st(struct repository *r,

int fd, struct stat *st,

struct object_directory *odb);

struct commit_graph *read_commit_graph_one(struct repository *r,

struct object_directory *odb);

struct commit_graph *parse_commit_graph(struct repository *r,

void *graph_map, size_t graph_size);

/*

* Return 1 if and only if the repository has a commit-graph

* file and generation numbers are computed in that file.

*/

int generation_numbers_enabled(struct repository *r);

/*

* Return 1 if and only if the repository has a commit-graph

* file and generation data chunk has been written for the file.

*/

int corrected_commit_dates_enabled(struct repository *r);

struct bloom_filter_settings *get_bloom_filter_settings(struct repository *r);

enum commit_graph_write_flags {

COMMIT_GRAPH_WRITE_APPEND = (1 << 0),

COMMIT_GRAPH_WRITE_PROGRESS = (1 << 1),

COMMIT_GRAPH_WRITE_SPLIT = (1 << 2),

COMMIT_GRAPH_WRITE_BLOOM_FILTERS = (1 << 3),

COMMIT_GRAPH_NO_WRITE_BLOOM_FILTERS = (1 << 4),

};

enum commit_graph_split_flags {

COMMIT_GRAPH_SPLIT_UNSPECIFIED = 0,

COMMIT_GRAPH_SPLIT_MERGE_PROHIBITED = 1,

COMMIT_GRAPH_SPLIT_REPLACE = 2

};

struct commit_graph_opts {

int size_multiple;

int max_commits;

timestamp_t expire_time;

enum commit_graph_split_flags split_flags;

int max_new_filters;

};

/*

* The write_commit_graph* methods return zero on success

* and a negative value on failure. Note that if the repository

* is not compatible with the commit-graph feature, then the

* methods will return 0 without writing a commit-graph.

*/

int write_commit_graph_reachable(struct object_directory *odb,

enum commit_graph_write_flags flags,

const struct commit_graph_opts *opts);

int write_commit_graph(struct object_directory *odb,

struct string_list *pack_indexes,

struct oidset *commits,

enum commit_graph_write_flags flags,

const struct commit_graph_opts *opts);

#define COMMIT_GRAPH_VERIFY_SHALLOW (1 << 0)

int verify_commit_graph(struct repository *r, struct commit_graph *g, int flags);

void close_commit_graph(struct raw_object_store *);

void free_commit_graph(struct commit_graph *);

/*

* Disable further use of the commit graph in this process when parsing a

* "struct commit".

*/

void disable_commit_graph(struct repository *r);

struct commit_graph_data {

uint32_t graph_pos;

timestamp_t generation;

};

/*

* Commits should be parsed before accessing generation, graph positions.

*/

timestamp_t commit_graph_generation(const struct commit *);

uint32_t commit_graph_position(const struct commit *);

#endif