#pragma once

#include <cstdint>
#include <memory>
#include <optional>
#include <span>
#include <string_view>
#include <variant>
#include <vector>

namespace sc {

// Opaque resource owned by the capture implementation.
struct CapturedFrame {
    int width = 0;
    int height = 0;
    uint64_t timestamp_ns = 0; // capture clock, monotonic
    std::vector<std::byte> pixels;
    // TODO: pixel format, stride, FD handle for dmabuf
};

// Capture target: whole monitor, specific window, or a region.
struct CaptureTargetWholeScreen {};
struct CaptureTargetWindow {
    std::string_view window_id;
};
struct CaptureTargetRegion {
    int x = 0;
    int y = 0;
    int width = 0;
    int height = 0;
};

using CaptureTarget = std::variant<
    CaptureTargetWholeScreen,
    CaptureTargetWindow,
    CaptureTargetRegion>;

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

    // Blocking call to acquire one frame. Returns std::nullopt on graceful stop.
    virtual std::optional<CapturedFrame> next_frame() = 0;

    // Request the session to stop. May be called from another thread.
    virtual void stop() = 0;
};

// Factory for the PipeWire / xdg-desktop-portal capture backend.
class CaptureFactory {
public:
    static std::unique_ptr<CaptureSession> create(CaptureTarget target);
};

} // namespace sc