#ifndef PROTOCOL_H
#define PROTOCOL_H

#include <cJSON.h>
#include <string>
#include <functional>

struct BinaryProtocol3 {
    uint8_t type;
    uint8_t reserved;
    uint16_t payload_size;
    uint8_t payload[];
} __attribute__((packed));

enum AbortReason {
    kAbortReasonNone,
    kAbortReasonWakeWordDetected
};

enum ListeningMode {
    kListeningModeAutoStop,
    kListeningModeManualStop,
    kListeningModeAlwaysOn // 需要 AEC 支持
};

class Protocol {
public:
    virtual ~Protocol() = default;

    inline int server_sample_rate() const {
        return server_sample_rate_;
    }

    void OnIncomingAudio(std::function<void(const std::string& data)> callback);
    void OnIncomingJson(std::function<void(const cJSON* root)> callback);
    void OnAudioChannelOpened(std::function<void()> callback);
    void OnAudioChannelClosed(std::function<void()> callback);
    void OnNetworkError(std::function<void(const std::string& message)> callback);

    virtual bool OpenAudioChannel() = 0;
    virtual void CloseAudioChannel() = 0;
    virtual bool IsAudioChannelOpened() const = 0;
    virtual void SendAudio(const std::string& data) = 0;
    virtual void SendWakeWordDetected(const std::string& wake_word);
    virtual void SendStartListening(ListeningMode mode);
    virtual void SendStopListening();
    virtual void SendAbortSpeaking(AbortReason reason);

protected:
    std::function<void(const cJSON* root)> on_incoming_json_;
    std::function<void(const std::string& data)> on_incoming_audio_;
    std::function<void()> on_audio_channel_opened_;
    std::function<void()> on_audio_channel_closed_;
    std::function<void(const std::string& message)> on_network_error_;

    int server_sample_rate_ = 16000;
    std::string session_id_;

    virtual void SendText(const std::string& text) = 0;
};

#endif // PROTOCOL_H