/* auth_store.h — SQLite-backed user account store for the web UI.
 *
 * Owned entirely by the webui plugin. Passwords are stored as PBKDF2-HMAC-
 * SHA256 hashes with a per-user random salt. All calls are thread-safe (the
 * store serializes access to its single SQLite connection internally). */
#ifndef NAUT_WEBUI_AUTH_STORE_H
#define NAUT_WEBUI_AUTH_STORE_H

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

typedef struct auth_store auth_store;

/* Open (creating if needed) the account database at `path`. Returns NULL on
 * failure. The schema is created/migrated on open. */
auth_store *auth_store_open(const char *path);
void auth_store_close(auth_store *s);

/* Number of accounts, or -1 on error. */
int auth_store_user_count(auth_store *s);
/* Number of admin accounts, or -1 on error. */
int auth_store_admin_count(auth_store *s);
bool auth_store_user_exists(auth_store *s, const char *username);

/* Verify a username/password pair (constant-time). On success, copies the
 * account's role ("admin"/"user") into role_out. */
bool auth_store_verify(auth_store *s, const char *username,
                       const char *password, char *role_out, size_t role_sz);

/* Create an account. `role` must be "admin" or "user" (defaults to "user" if
 * NULL/invalid). Returns false if the username already exists or on error. */
bool auth_store_create_user(auth_store *s, const char *username,
                            const char *password, const char *role);

bool auth_store_set_password(auth_store *s, const char *username,
                             const char *password);
/* Change an account's role ("admin"/"user"). */
bool auth_store_set_role(auth_store *s, const char *username, const char *role);
bool auth_store_delete_user(auth_store *s, const char *username);

/* Append {username, role, createdAt} objects (sorted by username) to the
 * json array `out`. Returns false on error. */
bool auth_store_list_users(auth_store *s, json_t *out);

#endif /* NAUT_WEBUI_AUTH_STORE_H */