/*
  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
  This file is part of GlusterFS.

  This file is licensed to you under your choice of the GNU Lesser
  General Public License, version 3 or any later version (LGPLv3 or
  later), or the GNU General Public License, version 2 (GPLv2), in all
  cases as published by the Free Software Foundation.
*/

#ifndef _OPTIONS_H
#define _OPTIONS_H

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>

#include "glusterfs/xlator.h"
#include "glusterfs/libglusterfs-messages.h"
/* Add possible new type of option you may need */
typedef enum {
    GF_OPTION_TYPE_ANY = 0,
    GF_OPTION_TYPE_STR,
    GF_OPTION_TYPE_INT,
    GF_OPTION_TYPE_SIZET,
    GF_OPTION_TYPE_PERCENT,
    GF_OPTION_TYPE_PERCENT_OR_SIZET,
    GF_OPTION_TYPE_BOOL,
    GF_OPTION_TYPE_XLATOR,
    GF_OPTION_TYPE_PATH,
    GF_OPTION_TYPE_TIME,
    GF_OPTION_TYPE_DOUBLE,
    GF_OPTION_TYPE_INTERNET_ADDRESS,
    GF_OPTION_TYPE_INTERNET_ADDRESS_LIST,
    GF_OPTION_TYPE_PRIORITY_LIST,
    GF_OPTION_TYPE_SIZE_LIST,
    GF_OPTION_TYPE_CLIENT_AUTH_ADDR,
    GF_OPTION_TYPE_MAX,
} volume_option_type_t;

typedef enum {
    GF_OPT_VALIDATE_BOTH = 0,
    GF_OPT_VALIDATE_MIN,
    GF_OPT_VALIDATE_MAX,
} opt_validate_type_t;

typedef enum {
    OPT_FLAG_NONE = 0,
    OPT_FLAG_SETTABLE = 1 << 0,   /* can be set using volume set */
    OPT_FLAG_CLIENT_OPT = 1 << 1, /* affects clients */
    OPT_FLAG_GLOBAL = 1
                      << 2, /* affects all instances of the particular xlator */
    OPT_FLAG_FORCE = 1 << 3,       /* needs force to be reset */
    OPT_FLAG_NEVER_RESET = 1 << 4, /* which should not be reset */
    OPT_FLAG_DOC = 1 << 5,         /* can be shown in volume set help */
} opt_flags_t;

typedef enum {
    OPT_STATUS_ADVANCED = 0,
    OPT_STATUS_BASIC = 1,
    OPT_STATUS_EXPERIMENTAL = 2,
    OPT_STATUS_DEPRECATED = 3,
} opt_level_t;

#define ZR_VOLUME_MAX_NUM_KEY 4
#define ZR_OPTION_MAX_ARRAY_SIZE 64
/* The maximum number of releases that an option could be backported to
 * based on the release schedule as in August 2017 (3), plus one more
 * Refer comment on volume_options.op_version for more information.
 */
#define GF_MAX_RELEASES 4

/* Custom validation functoins for options
 * TODO: Need to check what sorts of validation is being done, and decide if
 * passing the volinfo is actually required. If it is, then we should possibly
 * try a solution in GD2 for this.
 */
/* typedef int (*option_validation_fn) (glusterd_volinfo_t *volinfo, dict_t
 *dict, char *key, char *value, char **op_errstr);
 */

/* Each translator should define this structure */
/* XXX: This structure is in use by GD2, and SHOULD NOT be modified.
 * If there is a need to add new members, add them to the end of the structure.
 * If the struct must be modified, GD2 MUST be updated as well
 */
typedef struct volume_options {
    char *key[ZR_VOLUME_MAX_NUM_KEY];
    /* different key, same meaning */
    volume_option_type_t type;
    double min; /* 0 means no range */
    double max; /* 0 means no range */
    char *value[ZR_OPTION_MAX_ARRAY_SIZE];
    /* If specified, will check for one of
       the value from this array */
    char *default_value;
    char *description; /* about the key */
    /* Required for int options where only the min value
     * is given and is 0. This will cause validation not to
     * happen
     */
    opt_validate_type_t validate;

    /* The op-version at which this option was introduced.
     * This is an array to support options that get backported to supported
     * releases.
     * Normally, an option introduced for a major release just has a single
     * entry in the array, with op-version of the major release
     * For an option that is backported, the op-versions of the all the
     * releases it was ported to should be added, starting from the newest,
     * to the oldest.
     */
    uint32_t op_version[GF_MAX_RELEASES];
    /* The op-version at which this option was deprecated.
     * Follows the same rules as above.
     */
    uint32_t deprecated[GF_MAX_RELEASES];
    /* Additional flags for an option
     * Check the OPT_FLAG_* enums for available flags
     */
    uint32_t flags;
    /* Tags applicable to this option, which can be used to group similar
     * options
     */
    char *tags[ZR_OPTION_MAX_ARRAY_SIZE];
    /* A custom validation function if required
     * TODO: See todo above for option_validation_fn
     */
    /* option_validation_fn validate_fn; */
    /* This is actual key that should be set in the options dict. Can
     * contain varstrings
     */
    char *setkey;

    /* A 'level' is about the technical depth / understanding one
       needs to handle the option. 'category' is based on
       quality (ie, tests, people behind it, documentation available) */

    /* The level at which the option is classified */
    opt_level_t level;

    /* Flag to understand how this option is categorized */
    gf_category_t category;
} volume_option_t;

typedef struct vol_opt_list {
    struct list_head list;
    volume_option_t *given_opt;
} volume_opt_list_t;

int
xlator_tree_reconfigure(xlator_t *old_xl, xlator_t *new_xl);
int
xlator_validate_rec(xlator_t *xlator, char **op_errstr);
int
graph_reconf_validateopt(glusterfs_graph_t *graph, char **op_errstr);
int
xlator_option_info_list(volume_opt_list_t *list, char *key, char **def_val,
                        char **descr);
/*
int validate_xlator_volume_options (xlator_t *xl, dict_t *options,
                                    volume_option_t *opt, char **op_errstr);
*/
int
xlator_options_validate_list(xlator_t *xl, dict_t *options,
                             volume_opt_list_t *list, char **op_errstr);
int
xlator_option_validate(xlator_t *xl, char *key, char *value,
                       volume_option_t *opt, char **op_errstr);
int
xlator_options_validate(xlator_t *xl, dict_t *options, char **errstr);

int
xlator_option_validate_addr_list(xlator_t *xl, const char *key,
                                 const char *value, volume_option_t *opt,
                                 char **op_errstr);

volume_option_t *
xlator_volume_option_get(xlator_t *xl, const char *key);

volume_option_t *
xlator_volume_option_get_list(volume_opt_list_t *vol_list, const char *key);

#define DECLARE_INIT_OPT(type_t, type)                                         \
    int xlator_option_init_##type(xlator_t *this, dict_t *options, char *key,  \
                                  type_t *val_p);

DECLARE_INIT_OPT(char *, str);
DECLARE_INIT_OPT(uint64_t, uint64);
DECLARE_INIT_OPT(int64_t, int64);
DECLARE_INIT_OPT(uint32_t, uint32);
DECLARE_INIT_OPT(int32_t, int32);
DECLARE_INIT_OPT(uint64_t, size);
DECLARE_INIT_OPT(uint64_t, size_uint64);
DECLARE_INIT_OPT(double, percent);
DECLARE_INIT_OPT(double, percent_or_size);
DECLARE_INIT_OPT(gf_boolean_t, bool);
DECLARE_INIT_OPT(xlator_t *, xlator);
DECLARE_INIT_OPT(char *, path);
DECLARE_INIT_OPT(double, double);
DECLARE_INIT_OPT(uint32_t, time);

#define DEFINE_INIT_OPT(type_t, type, conv)                                    \
    int xlator_option_init_##type(xlator_t *this, dict_t *options, char *key,  \
                                  type_t *val_p)                               \
    {                                                                          \
        int ret = 0;                                                           \
        volume_option_t *opt = NULL;                                           \
        char *def_value = NULL;                                                \
        char *set_value = NULL;                                                \
        char *value = NULL;                                                    \
        xlator_t *old_THIS = NULL;                                             \
                                                                               \
        opt = xlator_volume_option_get(this, key);                             \
        if (!opt) {                                                            \
            gf_msg(this->name, GF_LOG_WARNING, EINVAL, LG_MSG_INVALID_ENTRY,   \
                   "unknown option: %s", key);                                 \
            ret = -1;                                                          \
            return ret;                                                        \
        }                                                                      \
        def_value = opt->default_value;                                        \
        ret = dict_get_str(options, key, &set_value);                          \
                                                                               \
        if (def_value)                                                         \
            value = def_value;                                                 \
        if (set_value)                                                         \
            value = set_value;                                                 \
        if (!value) {                                                          \
            gf_msg_trace(this->name, 0, "option %s not set", key);             \
            *val_p = (type_t)0;                                                \
            return 0;                                                          \
        }                                                                      \
        if (value == def_value) {                                              \
            gf_msg_trace(this->name, 0,                                        \
                         "option %s using default"                             \
                         " value %s",                                          \
                         key, value);                                          \
        } else {                                                               \
            gf_msg_debug(this->name, 0,                                        \
                         "option %s using set"                                 \
                         " value %s",                                          \
                         key, value);                                          \
        }                                                                      \
        old_THIS = THIS;                                                       \
        THIS = this;                                                           \
        ret = conv(value, val_p);                                              \
        THIS = old_THIS;                                                       \
        if (ret) {                                                             \
            gf_msg(this->name, GF_LOG_INFO, 0, LG_MSG_CONVERSION_FAILED,       \
                   "option %s conversion failed value %s", key, value);        \
            return ret;                                                        \
        }                                                                      \
        ret = xlator_option_validate(this, key, value, opt, NULL);             \
        return ret;                                                            \
    }

#define GF_OPTION_INIT(key, val, type, err_label)                              \
    do {                                                                       \
        int val_ret = 0;                                                       \
        val_ret = xlator_option_init_##type(THIS, THIS->options, key, &(val)); \
        if (val_ret)                                                           \
            goto err_label;                                                    \
    } while (0)

#define DECLARE_RECONF_OPT(type_t, type)                                       \
    int xlator_option_reconf_##type(xlator_t *this, dict_t *options,           \
                                    char *key, type_t *val_p);

DECLARE_RECONF_OPT(char *, str);
DECLARE_RECONF_OPT(uint64_t, uint64);
DECLARE_RECONF_OPT(int64_t, int64);
DECLARE_RECONF_OPT(uint32_t, uint32);
DECLARE_RECONF_OPT(int32_t, int32);
DECLARE_RECONF_OPT(uint64_t, size);
DECLARE_RECONF_OPT(uint64_t, size_uint64);
DECLARE_RECONF_OPT(double, percent);
DECLARE_RECONF_OPT(double, percent_or_size);
DECLARE_RECONF_OPT(gf_boolean_t, bool);
DECLARE_RECONF_OPT(xlator_t *, xlator);
DECLARE_RECONF_OPT(char *, path);
DECLARE_RECONF_OPT(double, double);
DECLARE_RECONF_OPT(uint32_t, time);

#define DEFINE_RECONF_OPT(type_t, type, conv)                                  \
    int xlator_option_reconf_##type(xlator_t *this, dict_t *options,           \
                                    char *key, type_t *val_p)                  \
    {                                                                          \
        int ret = 0;                                                           \
        volume_option_t *opt = NULL;                                           \
        char *def_value = NULL;                                                \
        char *set_value = NULL;                                                \
        char *value = NULL;                                                    \
        xlator_t *old_THIS = NULL;                                             \
                                                                               \
        opt = xlator_volume_option_get(this, key);                             \
        if (!opt) {                                                            \
            gf_msg(this->name, GF_LOG_WARNING, EINVAL, LG_MSG_INVALID_ENTRY,   \
                   "unknown option: %s", key);                                 \
            ret = -1;                                                          \
            return ret;                                                        \
        }                                                                      \
        def_value = opt->default_value;                                        \
        ret = dict_get_str(options, key, &set_value);                          \
                                                                               \
        if (def_value)                                                         \
            value = def_value;                                                 \
        if (set_value)                                                         \
            value = set_value;                                                 \
        if (!value) {                                                          \
            gf_msg_trace(this->name, 0, "option %s not set", key);             \
            *val_p = (type_t)0;                                                \
            return 0;                                                          \
        }                                                                      \
        if (value == def_value) {                                              \
            gf_msg_trace(this->name, 0, "option %s using default value %s",    \
                         key, value);                                          \
        } else {                                                               \
            gf_msg(this->name, GF_LOG_INFO, 0, 0,                              \
                   "option %s using set value %s", key, value);                \
        }                                                                      \
        old_THIS = THIS;                                                       \
        THIS = this;                                                           \
        ret = conv(value, val_p);                                              \
        THIS = old_THIS;                                                       \
        if (ret)                                                               \
            return ret;                                                        \
        ret = xlator_option_validate(this, key, value, opt, NULL);             \
        return ret;                                                            \
    }

#define GF_OPTION_RECONF(key, val, opt, type, err_label)                       \
    do {                                                                       \
        int val_ret = 0;                                                       \
        val_ret = xlator_option_reconf_##type(THIS, opt, key, &(val));         \
        if (val_ret)                                                           \
            goto err_label;                                                    \
    } while (0)

#endif /* !_OPTIONS_H */
