#pragma once
#include <cstddef>
#include <memory>
#include <string>
extern "C" {
#include <libavutil/frame.h>
}

namespace playback {
// One decoding worker produces output. The native audio callback is the consumer.
// Audio is interleaved stereo float at 48 kHz; write() never blocks.
class Output {
public:
    Output();
    ~Output();
    Output(const Output &) = delete;
    Output &operator=(const Output &) = delete;
    bool configure_audio(std::string &error);
    bool start(std::string &error);
    void pause();
    // Atomic target gain; callback slews to it within 240 frames (5 ms).
    void set_volume(float normalized0to1) noexcept;
    float volume() const noexcept;
    // Called with audio stopped. Clears audio and video from the old timeline.
    void reset();
    std::size_t write(const float *samples, std::size_t frames, double pts);
    std::size_t queued() const;
    // Latency-aware presented position; NaN until an audio callback has run.
    double clock() const;
    // Retains the frame's buffers; decoder may reuse its AVFrame after return.
    void present(const AVFrame *frame);
    // Returns a retained NSView. The view remains safe after Output is destroyed.
    void *make_video_view();
private:
    struct Impl;
    std::unique_ptr<Impl> impl;
};
}