#ifndef REST_CLIENT_H
#define REST_CLIENT_H

#include <stdbool.h>
#include <stddef.h>

/* Keepalive HTTPS connection for KuCoin REST API. */
typedef struct rest_conn_s rest_conn_t;

/* Create a REST connection handle. Does not connect yet. */
rest_conn_t *rest_conn_new(void);

/* Set the API credentials. Must be called before any request. */
void rest_conn_set_auth(rest_conn_t *rc,
                        const char *api_key,
                        const char *api_secret,
                        const char *api_passphrase);

/* Place a market order.
   Returns true on success and fills out_order_id.
   Returns false and fills out_error (up to err_sz) on failure. */
bool rest_order_place(rest_conn_t *rc,
                      const char *symbol, const char *side,
                      double funds, double size,
                      const char *client_oid,
                      char *out_order_id, size_t out_sz,
                      char *out_error, size_t err_sz);

/* Validate an order via the test endpoint.
   Returns true if the order would be accepted. */
bool rest_order_test(rest_conn_t *rc,
                     const char *symbol, const char *side,
                     double funds, double size,
                     char *out_error, size_t err_sz);

/* Fetch available balance for a currency (GET /api/v1/accounts).
   Returns true and writes the available amount to *out on success. */
bool rest_get_balance(rest_conn_t *rc,
                      const char *currency,
                      double *out);

/* Close the connection and free resources. */
void rest_conn_free(rest_conn_t *rc);

#endif