#ifndef VOICELINK_BLE_NAME_H
#define VOICELINK_BLE_NAME_H

#include <stdio.h>
#include <string.h>

// Legacy scan response: 31 bytes minus AD length/type = 29 name bytes.
// "vl-" (3) + model (<=17 UTF-8 bytes) + "-" (1) + ID (8).
#define VOICELINK_BLE_NAME_CAPACITY 30
static inline void voicelink_ble_name(char out[VOICELINK_BLE_NAME_CAPACITY],
                                     const char *model, const char *factory_id)
{
    size_t model_len = strlen(model);
    if (model_len > 17) {
        model_len = 17;
        // Do not truncate inside a UTF-8 code point.
        while (model_len && ((unsigned char)model[model_len] & 0xc0) == 0x80)
            model_len--;
    }
    size_t id_len = strlen(factory_id);
    const char *suffix = id_len >= 8 ? factory_id + id_len - 8 : factory_id;
    snprintf(out, VOICELINK_BLE_NAME_CAPACITY, "vl-%.*s-%s",
             (int)model_len, model, suffix);
}
#endif