/* pkg.h - the opkg package management system

   Carl D. Worth

   Copyright (C) 2001 University of Southern California

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.
*/

#ifndef PKG_H
#define PKG_H

#include <sys/types.h>
#include <libubox/blob.h>

#include "pkg_vec.h"
#include "str_list.h"
#include "active_list.h"
#include "pkg_src.h"
#include "pkg_dest.h"
#include "opkg_conf.h"
#include "conffile_list.h"

struct opkg_conf;

#ifndef ARRAY_SIZE
#define ARRAY_SIZE(array) sizeof(array) / sizeof((array)[0])
#endif

/* I think "Size" is currently the shortest field name */
#define PKG_MINIMUM_FIELD_NAME_LEN 4

enum pkg_state_want {
	SW_UNKNOWN = 1,
	SW_INSTALL,
	SW_DEINSTALL,
	SW_PURGE,
	SW_LAST_STATE_WANT
};
typedef enum pkg_state_want pkg_state_want_t;

enum pkg_state_flag {
	SF_OK = 0,
	SF_REINSTREQ = 1,
	SF_HOLD = 2,		/* do not upgrade version */
	SF_REPLACE = 4,		/* replace this package */
	SF_NOPRUNE = 8,		/* do not remove obsolete files */
	SF_PREFER = 16,		/* prefer this version */
	SF_OBSOLETE = 32,	/* old package in upgrade pair */
	SF_MARKED = 64,		/* temporary mark */
	SF_FILELIST_CHANGED = 128,	/* needs filelist written */
	SF_USER = 256,
	SF_NEED_DETAIL = 512,
	SF_LAST_STATE_FLAG
};
typedef enum pkg_state_flag pkg_state_flag_t;
#define SF_NONVOLATILE_FLAGS (SF_HOLD|SF_NOPRUNE|SF_PREFER|SF_OBSOLETE|SF_USER)

enum pkg_state_status {
	SS_NOT_INSTALLED = 1,
	SS_UNPACKED,
	SS_HALF_CONFIGURED,
	SS_INSTALLED,
	SS_HALF_INSTALLED,
	SS_CONFIG_FILES,
	SS_POST_INST_FAILED,
	SS_REMOVAL_FAILED,
	SS_LAST_STATE_STATUS
};
typedef enum pkg_state_status pkg_state_status_t;

enum pkg_fields {
	PKG_MAINTAINER,
	PKG_PRIORITY,
	PKG_SOURCE,
	PKG_TAGS,
	PKG_SECTION,
	PKG_EPOCH,
	PKG_FILENAME,
	PKG_LOCAL_FILENAME,
	PKG_VERSION,
	PKG_REVISION,
	PKG_DESCRIPTION,
	PKG_MD5SUM,
	PKG_SHA256SUM,
	PKG_SIZE,
	PKG_INSTALLED_SIZE,
	PKG_INSTALLED_TIME,
	PKG_TMP_UNPACK_DIR,
	PKG_REPLACES,
	PKG_PROVIDES,
	PKG_DEPENDS,
	PKG_CONFLICTS,
	PKG_CONFFILES,
	PKG_ALTERNATIVES,
};

struct abstract_pkg {
	char *name;
	pkg_vec_t *pkgs;

	/* XXX: This should be abstract_pkg_vec_t for consistency. */
	struct abstract_pkg **depended_upon_by;

	abstract_pkg_vec_t *provided_by;
	abstract_pkg_vec_t *replaced_by;

	char dependencies_checked;
	char pre_dependencies_checked;
	pkg_state_status_t state_status:4;
	pkg_state_flag_t state_flag:11;
};

#include "pkg_depends.h"

enum pkg_alternative_field {
	PAF_PRIO,
	PAF_PATH,
	PAF_ALTPATH,
	__PAF_MAX,
};

struct pkg_alternative {
	int prio;
	char *path;
	char *altpath;
};

struct pkg_alternatives {
	int nalts;
	struct pkg_alternative **alts;
};

/* XXX: CLEANUP: I'd like to clean up pkg_t in several ways:

   The 3 version fields should go into a single version struct. (This
   is especially important since, currently, pkg->version can easily
   be mistaken for pkg_verson_str_alloc(pkg) although they are very
   distinct. This has been the source of multiple bugs.

   The 3 state fields could possibly also go into their own struct.

   All fields which deal with lists of packages, (Depends,
   Pre-Depends, Provides, Suggests, Recommends, Enhances), should each
   be handled by a single struct in pkg_t

   All string fields for which there is a small set of possible
   values, (section, maintainer, architecture, maybe version?), that
   are reused among different packages -- for all such packages we
   should move from "char *"s to some atom datatype to share data
   storage and use less memory. We might even do reference counting,
   but probably not since most often we only create new pkg_t structs,
   we don't often free them.  */
struct pkg {
	char *name;
	pkg_src_t *src;
	pkg_dest_t *dest;
	pkg_state_want_t state_want:3;
	pkg_state_flag_t state_flag:11;
	pkg_state_status_t state_status:4;

	abstract_pkg_t *parent;

	/* As pointer for lazy evaluation */
	str_list_t *installed_files;
	/* XXX: CLEANUP: I'd like to perhaps come up with a better
	   mechanism to avoid the problem here, (which is that the
	   installed_files list was being freed from an inner loop while
	   still being used within an outer loop. */
	int installed_files_ref_cnt;

	unsigned int essential:1;
/* Adding this flag, to "force" opkg to choose a "provided_by_hand" package, if there are multiple choice */
	unsigned int provided_by_hand:1;

	/* this flag specifies whether the package was installed to satisfy another
	 * package's dependancies */
	unsigned int auto_installed:1;
	unsigned int is_upgrade:1;

	unsigned int arch_index:3;

	struct blob_buf blob;
};

pkg_t *pkg_new(void);
void pkg_deinit(pkg_t * pkg);
int pkg_init_from_file(pkg_t * pkg, const char *filename);

void *pkg_set_raw(pkg_t *pkg, int id, const void *val, size_t len);
void *pkg_get_raw(const pkg_t *pkg, int id);

static inline int pkg_set_int(pkg_t *pkg, int id, int val)
{
	int *res = pkg_set_raw(pkg, id, &val, sizeof(val));
	return res ? *res : 0;
}

static inline int pkg_get_int(const pkg_t *pkg, int id)
{
	int *ptr = pkg_get_raw(pkg, id);
	return ptr ? *ptr : 0;
}

char *pkg_set_string(pkg_t *pkg, int id, const char *s);

static inline char *pkg_get_string(const pkg_t *pkg, int id)
{
	return (char *) pkg_get_raw(pkg, id);
}

static inline void * pkg_set_ptr(pkg_t *pkg, int id, void *ptr)
{
	void **res = pkg_set_raw(pkg, id, &ptr, sizeof(ptr));
	return res ? *res : NULL;
}

static inline void * pkg_get_ptr(const pkg_t *pkg, int id)
{
	void **ptr = pkg_get_raw(pkg, id);
	return ptr ? *ptr : NULL;
}

char *pkg_set_architecture(pkg_t *pkg, const char *architecture, ssize_t len);
char *pkg_get_architecture(const pkg_t *pkg);
int pkg_get_arch_priority(const pkg_t *pkg);

char *pkg_get_md5(const pkg_t *pkg);
char *pkg_set_md5(pkg_t *pkg, const char *cksum);

char *pkg_get_sha256(const pkg_t *pkg);
char *pkg_set_sha256(pkg_t *pkg, const char *cksum);

abstract_pkg_t *abstract_pkg_new(void);

/*
 * merges fields from newpkg into oldpkg.
 * Forcibly sets oldpkg state_status, state_want and state_flags
 */
int pkg_merge(pkg_t * oldpkg, pkg_t * newpkg);

char *pkg_version_str_alloc(pkg_t * pkg);

int pkg_compare_versions(const pkg_t *pkg, const pkg_t *ref_pkg);
int pkg_name_version_and_architecture_compare(const void *a, const void *b);
int abstract_pkg_name_compare(const void *a, const void *b);

void pkg_formatted_info(FILE * fp, pkg_t * pkg);
void pkg_formatted_field(FILE * fp, pkg_t * pkg, const char *field);

void pkg_print_status(pkg_t * pkg, FILE * file);
str_list_t *pkg_get_installed_files(pkg_t * pkg);
void pkg_free_installed_files(pkg_t * pkg);
void pkg_remove_installed_files_list(pkg_t * pkg);
conffile_t *pkg_get_conffile(pkg_t * pkg, const char *file_name);
int pkg_run_script(pkg_t * pkg, const char *script, const char *args);

/* enum mappings */
pkg_state_want_t pkg_state_want_from_str(char *str);
pkg_state_flag_t pkg_state_flag_from_str(const char *str);
pkg_state_status_t pkg_state_status_from_str(const char *str);

int pkg_version_satisfied(pkg_t * it, pkg_t * ref, const char *op);

int pkg_arch_supported(pkg_t * pkg);
void pkg_info_preinstall_check(void);

int pkg_write_filelist(pkg_t * pkg);
int pkg_write_changed_filelists(void);

#endif
