#pragma once

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

#ifdef __cplusplus
extern "C" {
#endif

#define TRIKKE_BLE_FRAGMENT_HEADER_SIZE 8
#define TRIKKE_BLE_ACK_SIZE             8
#define TRIKKE_BLE_BEGIN_SESSION_SIZE   12

// BLE data notifications carry a little-endian packet sequence, byte offset,
// total TRK1 frame size, then the frame bytes at that offset. The unchanged
// TRK1 CRC remains the end-to-end integrity check after reassembly.
size_t trikke_ble_encode_fragment(
    uint8_t *output,
    size_t output_size,
    const uint8_t *packet,
    size_t packet_size,
    size_t packet_offset,
    size_t att_payload_capacity);

// An application acknowledgement is ASCII "ACK1" followed by the exact
// little-endian TRK1 packet sequence that the receiver persisted.
bool trikke_ble_decode_ack(
    const uint8_t *ack,
    size_t ack_size,
    uint32_t *packet_sequence);

// A session begin is ASCII "BGN1" followed by a receiver-generated uint64
// token. Repeating the same token is idempotent across BLE reconnects.
bool trikke_ble_decode_begin_session(
    const uint8_t *command,
    size_t command_size,
    uint64_t *session_token);

// Notification delivery is active only after both the CCCD and session
// authorization are ready. Returns true when the effective state changes.
bool trikke_ble_update_subscription(
    bool notify_enabled,
    bool session_connection_ready,
    bool *subscribed);

#ifdef __cplusplus
}
#endif