/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Valentin V. Bartenev
 * Copyright (C) NGINX, Inc.
 * Copyright 2024, Alejandro Colomar <alx@kernel.org>
 */

#ifndef _NXT_CONF_INCLUDED_
#define _NXT_CONF_INCLUDED_


typedef enum {
    NXT_CONF_NULL = 0,
    NXT_CONF_BOOLEAN,
    NXT_CONF_INTEGER,
    NXT_CONF_NUMBER,
    NXT_CONF_STRING,
    NXT_CONF_ARRAY,
    NXT_CONF_OBJECT,
} nxt_conf_type_t;


typedef enum {
    NXT_CONF_OP_OK = 0,
    NXT_CONF_OP_NOT_FOUND,
    NXT_CONF_OP_NOT_ALLOWED,
    NXT_CONF_OP_ERROR,
} nxt_conf_op_ret_t;


typedef struct nxt_conf_value_s  nxt_conf_value_t;
typedef struct nxt_conf_op_s     nxt_conf_op_t;


typedef struct {
    u_char               *pos;
    u_char               *detail;
} nxt_conf_json_error_t;


typedef enum {
    NXT_CONF_MAP_INT8,
    NXT_CONF_MAP_INT32,
    NXT_CONF_MAP_INT64,
    NXT_CONF_MAP_INT,
    NXT_CONF_MAP_SIZE,
    NXT_CONF_MAP_OFF,
    NXT_CONF_MAP_MSEC,
    NXT_CONF_MAP_DOUBLE,
    NXT_CONF_MAP_STR,
    NXT_CONF_MAP_STR_COPY,
    NXT_CONF_MAP_CSTRZ,
    NXT_CONF_MAP_PTR,
} nxt_conf_map_type_t;


typedef struct {
    nxt_str_t            name;
    nxt_conf_map_type_t  type;
    size_t               offset;
} nxt_conf_map_t;


typedef struct {
    uint32_t             level;
    uint8_t              more_space;  /* 1 bit. */
} nxt_conf_json_pretty_t;


typedef struct {
    nxt_conf_value_t     *conf;
    nxt_mp_t             *pool;
    nxt_str_t            error;
    void                 *ctx;
    nxt_tstr_state_t     *tstr_state;
    nxt_mp_t             *conf_pool;
    nxt_uint_t           ver;
} nxt_conf_validation_t;


NXT_EXPORT nxt_uint_t nxt_conf_type(const nxt_conf_value_t *value);

NXT_EXPORT nxt_conf_value_t *nxt_conf_get_path(nxt_conf_value_t *value,
    const nxt_str_t *path);
NXT_EXPORT nxt_conf_value_t *nxt_conf_get_object_member(
    const nxt_conf_value_t *value, const nxt_str_t *name, uint32_t *index);
NXT_EXPORT nxt_conf_value_t *nxt_conf_next_object_member(
    const nxt_conf_value_t *value, nxt_str_t *name, uint32_t *next);
NXT_EXPORT nxt_conf_value_t *nxt_conf_get_array_element(
    const nxt_conf_value_t *value, uint32_t index);
NXT_EXPORT nxt_conf_value_t *nxt_conf_get_array_element_or_itself(
    nxt_conf_value_t *value, uint32_t index);

NXT_EXPORT nxt_int_t nxt_conf_map_object(nxt_mp_t *mp,
    const nxt_conf_value_t *value, const nxt_conf_map_t *map, nxt_uint_t n,
    void *data);

nxt_conf_op_ret_t nxt_conf_op_compile(nxt_mp_t *mp, nxt_conf_op_t **ops,
    const nxt_conf_value_t *root, const nxt_str_t *path, nxt_conf_value_t *value,
    nxt_bool_t add);
nxt_conf_value_t *nxt_conf_clone(nxt_mp_t *mp, nxt_conf_op_t *op,
    const nxt_conf_value_t *value);

nxt_conf_value_t *nxt_conf_json_parse(nxt_mp_t *mp, u_char *start, u_char *end,
    nxt_conf_json_error_t *error);

#define nxt_conf_json_parse_str(mp, str)                                      \
    nxt_conf_json_parse(mp, (str)->start, (str)->start + (str)->length, NULL)

size_t nxt_conf_json_length(nxt_conf_value_t *value,
    nxt_conf_json_pretty_t *pretty);
u_char *nxt_conf_json_print(u_char *p, nxt_conf_value_t *value,
    nxt_conf_json_pretty_t *pretty);
void nxt_conf_json_position(u_char *start, const u_char *pos, nxt_uint_t *line,
    nxt_uint_t *column);

nxt_int_t nxt_conf_validate(nxt_conf_validation_t *vldt);

NXT_EXPORT void nxt_conf_get_string(nxt_conf_value_t *value, nxt_str_t *str);
NXT_EXPORT nxt_str_t *nxt_conf_get_string_dup(nxt_conf_value_t *value,
    nxt_mp_t *mp, nxt_str_t *str);
NXT_EXPORT void nxt_conf_set_string(nxt_conf_value_t *value,
    const nxt_str_t *str);
NXT_EXPORT nxt_int_t nxt_conf_set_string_dup(nxt_conf_value_t *value,
    nxt_mp_t *mp, const nxt_str_t *str);
NXT_EXPORT double nxt_conf_get_number(nxt_conf_value_t *value);
NXT_EXPORT uint8_t nxt_conf_get_boolean(nxt_conf_value_t *value);

// FIXME reimplement and reorder functions below
NXT_EXPORT nxt_uint_t nxt_conf_object_members_count(
    const nxt_conf_value_t *value);
nxt_conf_value_t *nxt_conf_create_object(nxt_mp_t *mp, nxt_uint_t count);
void nxt_conf_set_member(nxt_conf_value_t *object, const nxt_str_t *name,
    const nxt_conf_value_t *value, uint32_t index);
nxt_int_t nxt_conf_set_member_dup(nxt_conf_value_t *object, nxt_mp_t *mp,
    const nxt_str_t *name, const nxt_conf_value_t *value, uint32_t index);
void nxt_conf_set_member_string(nxt_conf_value_t *object,
    const nxt_str_t *name, const nxt_str_t *value, uint32_t index);
nxt_int_t nxt_conf_set_member_string_dup(nxt_conf_value_t *object,
    nxt_mp_t *mp, const nxt_str_t *name, const nxt_str_t *value,
    uint32_t index);
void nxt_conf_set_member_integer(nxt_conf_value_t *object,
    const nxt_str_t *name, int64_t value, uint32_t index);
void nxt_conf_set_member_null(nxt_conf_value_t *object, const nxt_str_t *name,
    uint32_t index);

nxt_conf_value_t *nxt_conf_create_array(nxt_mp_t *mp, nxt_uint_t count);
void nxt_conf_set_element(nxt_conf_value_t *array, nxt_uint_t index,
    const nxt_conf_value_t *value);
nxt_int_t nxt_conf_set_element_string_dup(nxt_conf_value_t *array,
    nxt_mp_t *mp, nxt_uint_t index, const nxt_str_t *value);
NXT_EXPORT nxt_uint_t nxt_conf_array_elements_count(
    const nxt_conf_value_t *value);
NXT_EXPORT nxt_uint_t nxt_conf_array_elements_count_or_1(
    const nxt_conf_value_t *value);
void nxt_conf_array_qsort(const nxt_conf_value_t *value,
    int (*compare)(const void *, const void *));


#endif /* _NXT_CONF_INCLUDED_ */