#pragma once

#include "link_protocol.hpp"
#include <cstdint>
#include <functional>

namespace microbu::ble {

using Receiver = std::function<void(link::Bytes)>;

/// @brief A set of counters for tracking BLE message traffic.
struct Counters {
    std::uint32_t rx_messages = 0;
    std::uint32_t tx_messages = 0;
    std::uint32_t tx_failed = 0;
    std::uint32_t malformed = 0;
};

/**
 * @brief Starts a simple, bonded BLE GATT peripheral on the NimBLE host.
 * Uses structured ETSI C-ITS Station Service & Characteristics:
 *   Service:             0000C175-BA5E-4C17-8000-00805F9B34FB
 *   BTP-DATA.request:    0000C176-BA5E-4C17-8000-00805F9B34FB (Write, Authenticated/Encrypted) 
 *   BTP-DATA.indication: 0000C177-BA5E-4C17-8000-00805F9B34FB (Notify, Authenticated/Encrypted)
 *   PoTi Fix Update:     0000C178-BA5E-4C17-8000-00805F9B34FB (Write, Authenticated/Encrypted)
 *   Station Status:      0000C179-BA5E-4C17-8000-00805F9B34FB (Read / Notify, Authenticated/Encrypted)
 *   SF-SAP Identity:     0000C17A-BA5E-4C17-8000-00805F9B34FB (Notify, Authenticated/Encrypted)
 *   Station Configure:   0000C17B-BA5E-4C17-8000-00805F9B34FB (Write, Authenticated/Encrypted)
 *   Result:              0000C17C-BA5E-4C17-8000-00805F9B34FB (Notify, Authenticated/Encrypted)
 *
 * Fixed passkey bonding: 123456.
 * Single ATT message transmission/reception up to 512 bytes without fragmentation chunk delays.
 * @param receiver Invoked with each decoded station-link message written by the phone.
 * @return false if the NimBLE host or GATT service failed to start.
 */
bool start(Receiver receiver);

/**
 * @brief Sends one complete station-link message via GATT notification.
 * Dispatches immediately without queuing delay.
 * @param message Encoded station-link message to notify.
 * @return false if not connected/subscribed or the notification could not be sent.
 */
bool write(const link::Bytes& message);

/// @return true if a phone is connected.
bool connected();
/// @brief MicrOBU: allows or stops advertising (an existing connection is never dropped). Called
/// with false while the phone uses the USB link, so BLE takes no airtime from ITS-G5.
void set_advertising_allowed(bool allowed);
/// @return true while advertising is allowed (see set_advertising_allowed).
bool advertising_allowed();
/// @return true if the phone has subscribed to notifications.
bool is_subscribed();
/// @return Current message/error counters.
Counters counters();

} // namespace microbu::ble