#pragma once
#include <glm/vec2.hpp>
#include <string>

struct GLFWwindow;

namespace hd2d {

// GLFW window + OpenGL 4.5 core context with simple polled input.
class Window {
public:
    // Non-resizable windows float on tiling WMs, keeping an exact size.
    // `visible = false` creates a hidden, never-focused window that only
    // provides the GL context (headless captures: render into an
    // OffscreenTarget, see Screenshot.h). Hidden windows ignore vsync,
    // swapBuffers() is a no-op (unmapped Wayland surfaces never get frame
    // callbacks, so a real swap could block forever) and every input query
    // reports nothing, so the user's keyboard/mouse cannot affect them.
    bool create(int width, int height, const std::string& title, bool vsync = true, bool resizable = true,
                bool visible = true);
    void destroy();

    // Polls events and refreshes per-frame input state. Returns false once the
    // window should close.
    bool pollEvents();
    void swapBuffers();
    bool visible() const { return visible_; }

    bool keyDown(int glfwKey) const;
    bool keyPressed(int glfwKey) const;  // went down this frame
    bool mouseDown(int glfwButton) const;
    glm::vec2 mouseDelta() const { return visible_ ? mouseDelta_ : glm::vec2(0.0f); }
    float scrollDelta() const { return visible_ ? scrollDelta_ : 0.0f; }

    int width() const { return width_; }
    int height() const { return height_; }
    bool resized() const { return resized_; }
    GLFWwindow* handle() const { return window_; }
    void setTitle(const std::string& title);
    void requestClose();

private:
    static void onFramebufferSize(GLFWwindow* w, int width, int height);
    static void onScroll(GLFWwindow* w, double dx, double dy);

    GLFWwindow* window_ = nullptr;
    int width_ = 0, height_ = 0;
    bool resized_ = false;
    bool visible_ = true;
    bool keys_[512] = {};
    bool prevKeys_[512] = {};
    glm::vec2 lastMouse_{0.0f};
    glm::vec2 mouseDelta_{0.0f};
    float scrollAccum_ = 0.0f;
    float scrollDelta_ = 0.0f;
};

}  // namespace hd2d