#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));


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);

    virtual void SendAudio(const std::string& data) = 0;
    virtual void SendText(const std::string& text) = 0;
    virtual void SendState(const std::string& state) = 0;
    virtual void SendAbort() = 0;
    virtual bool OpenAudioChannel() = 0;
    virtual void CloseAudioChannel() = 0;
    virtual bool IsAudioChannelOpened() const = 0;

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_;

    int server_sample_rate_ = 16000;
};

#endif // PROTOCOL_H