/*
 * Copyright (C) the libgit2 contributors. All rights reserved.
 *
 * This file is part of libgit2, distributed under the GNU GPL v2 with
 * a Linking Exception. For full terms see the included COPYING file.
 */
#ifndef INCLUDE_attr_file_h__
#define INCLUDE_attr_file_h__

#include "git2/oid.h"
#include "git2/attr.h"
#include "vector.h"
#include "pool.h"
#include "buffer.h"
#include "fileops.h"

#define GIT_ATTR_FILE			".gitattributes"
#define GIT_ATTR_FILE_INREPO	"info/attributes"
#define GIT_ATTR_FILE_SYSTEM	"gitattributes"
#define GIT_ATTR_FILE_XDG		"attributes"

#define GIT_ATTR_FNMATCH_NEGATIVE	(1U << 0)
#define GIT_ATTR_FNMATCH_DIRECTORY	(1U << 1)
#define GIT_ATTR_FNMATCH_FULLPATH	(1U << 2)
#define GIT_ATTR_FNMATCH_MACRO		(1U << 3)
#define GIT_ATTR_FNMATCH_IGNORE		(1U << 4)
#define GIT_ATTR_FNMATCH_HASWILD	(1U << 5)
#define GIT_ATTR_FNMATCH_ALLOWSPACE	(1U << 6)
#define GIT_ATTR_FNMATCH_ICASE		(1U << 7)
#define GIT_ATTR_FNMATCH_MATCH_ALL	(1U << 8)
#define GIT_ATTR_FNMATCH_ALLOWNEG   (1U << 9)
#define GIT_ATTR_FNMATCH_ALLOWMACRO (1U << 10)

#define GIT_ATTR_FNMATCH__INCOMING \
	(GIT_ATTR_FNMATCH_ALLOWSPACE | \
	 GIT_ATTR_FNMATCH_ALLOWNEG | GIT_ATTR_FNMATCH_ALLOWMACRO)

extern const char *git_attr__true;
extern const char *git_attr__false;
extern const char *git_attr__unset;

typedef struct {
	char *pattern;
	size_t length;
	unsigned int flags;
} git_attr_fnmatch;

typedef struct {
	git_attr_fnmatch match;
	git_vector assigns;		/* vector of <git_attr_assignment*> */
} git_attr_rule;

typedef struct {
	git_refcount unused;
	const char *name;
	uint32_t name_hash;
} git_attr_name;

typedef struct {
	git_refcount rc;		/* for macros */
	char *name;
	uint32_t name_hash;
	const char *value;
} git_attr_assignment;

typedef struct {
	char *key;				/* cache "source#path" this was loaded from */
	git_vector rules;		/* vector of <rule*> or <fnmatch*> */
	git_pool *pool;
	bool pool_is_allocated;
	union {
		git_oid oid;
		git_futils_filestamp stamp;
	} cache_data;
} git_attr_file;

typedef struct {
	git_buf  full;
	char    *path;
	char    *basename;
	int      is_dir;
} git_attr_path;

typedef enum {
	GIT_ATTR_FILE_FROM_FILE = 0,
	GIT_ATTR_FILE_FROM_INDEX = 1
} git_attr_file_source;

/*
 * git_attr_file API
 */

extern int git_attr_file__new(
	git_attr_file **attrs_ptr, git_attr_file_source src, const char *path, git_pool *pool);

extern int git_attr_file__new_and_load(
	git_attr_file **attrs_ptr, const char *path);

extern void git_attr_file__free(git_attr_file *file);

extern void git_attr_file__clear_rules(git_attr_file *file);

extern int git_attr_file__parse_buffer(
	git_repository *repo, void *parsedata, const char *buf, git_attr_file *file);

extern int git_attr_file__lookup_one(
	git_attr_file *file,
	const git_attr_path *path,
	const char *attr,
	const char **value);

/* loop over rules in file from bottom to top */
#define git_attr_file__foreach_matching_rule(file, path, iter, rule)	\
	git_vector_rforeach(&(file)->rules, (iter), (rule)) \
		if (git_attr_rule__match((rule), (path)))

extern uint32_t git_attr_file__name_hash(const char *name);


/*
 * other utilities
 */

extern int git_attr_fnmatch__parse(
	git_attr_fnmatch *spec,
	git_pool *pool,
	const char *source,
	const char **base);

extern bool git_attr_fnmatch__match(
	git_attr_fnmatch *rule,
	const git_attr_path *path);

extern void git_attr_rule__free(git_attr_rule *rule);

extern bool git_attr_rule__match(
	git_attr_rule *rule,
	const git_attr_path *path);

extern git_attr_assignment *git_attr_rule__lookup_assignment(
	git_attr_rule *rule, const char *name);

extern int git_attr_path__init(
	git_attr_path *info, const char *path, const char *base);

extern void git_attr_path__free(git_attr_path *info);

extern int git_attr_assignment__parse(
	git_repository *repo, /* needed to expand macros */
	git_pool *pool,
	git_vector *assigns,
	const char **scan);

#endif