#pragma once
#include "hd2d/GL.h"
#include "hd2d/RenderTarget.h"

#include <string>

namespace hd2d {

// Writes color attachment 0 of `fbo` as PNG; `fbo` = 0 reads the window's
// backbuffer (call before swapBuffers).
bool saveScreenshot(const std::string& path, int width, int height, GLuint fbo = 0);

// Window-independent render output for headless captures. Color is plain
// RGBA8 (not sRGB) plus a depth/stencil buffer, matching the default
// framebuffer, so captures are pixel-identical to on-screen frames.
//
//   hd2d::Window window;  window.create(w, h, "capture", false, false, /*visible*/ false);
//   hd2d::OffscreenTarget out;  out.create(window.width(), window.height());
//   renderer.setOutputFramebuffer(out.fbo());
//   renderer.render(scene, cam, time);  // + any ImGui / UI drawing
//   out.save("shot.png");
class OffscreenTarget {
public:
    bool create(int width, int height);
    void resize(int width, int height);  // reallocates only when the size changes
    GLuint fbo() const { return target_.fbo(); }
    GLuint color() const { return target_.color(); }
    int width() const { return target_.width(); }
    int height() const { return target_.height(); }
    bool save(const std::string& path) const { return saveScreenshot(path, width(), height(), fbo()); }

private:
    RenderTarget target_;
};

}  // namespace hd2d