// This file is part of noxos and licensed under the MIT open source license

#ifndef NOXOS_JSON_H
#define NOXOS_JSON_H

#include "utils/string.h"
#include "utils/stdtypes.h"


/*
 * JSON node schematic
 *
 *                      +-----------+
 *           +----------| Root Node |------------+
 *           |          +-----------+            |
 *           |                ^                  |
 *           |                |                  |
 *    [childs_start]  /----[parent]------\  [childs_end]
 *           |      /         |           \      |
 *           v    /           |            \     v
 *       +------+          +------+          +------+
 *       | Node |--[next]->| Node |--[next]->| Node |
 *       |      |<-[prev]--|      |<-[prev]--|      |  ---> . . .
 *       +------+          +------+          +------+
 *
 *         |
 *         v
 *       . . .
 *
 * */

#define JSON_INCREMENT_TOKEN_ID \
    *token_id += 1; \
    if (*token_id >= json->num_tokens) { \
        log(LOG_ERROR, "failed to parse json -> unexpected EOF"); \
        json_node_dump(json->root_node, 0); \
        return false; \
    }

typedef enum {
    JSON_TOKEN_NUMERIC,
    JSON_TOKEN_TEXT,
    JSON_TOKEN_STRING,
    JSON_TOKEN_SPECIAL
} json_token_type_E;

typedef enum {
    JSON_NODE_OBJECT,
    JSON_NODE_ARRAY,
    JSON_NODE_STRING,
    JSON_NODE_NUMBER,
    JSON_NODE_BOOL,
    JSON_NODE_NULL
} json_node_type_E;

typedef struct {
    json_token_type_E   type;
    uint64_t            value;
    string_t            string;

    uint32_t            line;
    uint32_t            column;
} json_token_T;

typedef struct json_node_T json_node_T;
struct json_node_T {
    json_node_type_E    type;
    string_t            string;
    uint64_t            value;

    json_node_T*        parent;
    json_node_T*        childs_start;
    json_node_T*        childs_end;
    json_node_T*        prev;
    json_node_T*        next;
};

typedef struct {
    json_token_T*       tokens;
    uint64_t        num_tokens;
    void*               string_buffer;
    json_node_T*        root_node;
} json_T;

json_T*      json_from_string         (string_t str);
void         json_destruct            (json_T* json);
json_node_T* json_node_alloc          (json_node_T* parent, json_node_type_E type, json_token_T* token);
void         json_node_destruct       (json_node_T* node);
void         json_node_dump           (json_node_T* node, uint32_t indent);
string_t     json_node_type_to_string (json_node_type_E type);
void         json_tokenize            (json_T* json, string_t str);
bool         json_parse               (json_T* json);
bool         json_parse_assignment    (json_T* json, uint32_t* token_id, json_node_T* node);
bool         json_parse_object        (json_T* json, uint32_t* token_id, json_node_T* node);
bool         json_parse_array         (json_T* json, uint32_t* token_id, json_node_T* node);

#endif //NOXOS_JSON_H