#pragma once

#include <SDL3/SDL_gpu.h>
#include <SDL3/SDL_surface.h>
#include <string>

// ============================================================================
// GpuTexture — SDL_GPU texture + sampler wrapper
// Handles sprite textures, render targets, and the 1×1 white utility texture.
// ============================================================================
class GpuTexture {
public:
    GpuTexture()  = default;
    ~GpuTexture() = default;

    // Load from resource path (pack or disk) using stb_image.
    bool fromFile(SDL_GPUDevice* device, const std::string& file_path);

    // Upload pixel data from an SDL_Surface to a new GPU texture + sampler.
    // Uses nearest-neighbor filter for sprite pixel-perfect look.
    bool fromSurface(SDL_GPUDevice* device, SDL_Surface* surface, bool nearest = true);

    // Create an offscreen render target (COLOR_TARGET | SAMPLER usage).
    bool createRenderTarget(SDL_GPUDevice* device, int w, int h,
                            SDL_GPUTextureFormat format);

    // Create a 1×1 opaque white texture (used for untextured geometry).
    bool createWhite(SDL_GPUDevice* device);

    // Release GPU resources.
    void destroy(SDL_GPUDevice* device);

    SDL_GPUTexture* texture() const { return texture_; }
    SDL_GPUSampler* sampler() const { return sampler_; }
    int width()  const { return width_; }
    int height() const { return height_; }
    bool isValid() const { return texture_ != nullptr; }

private:
    bool uploadPixels(SDL_GPUDevice* device, const void* pixels,
                      int w, int h, SDL_GPUTextureFormat format);
    bool createSampler(SDL_GPUDevice* device, bool nearest);

    SDL_GPUTexture* texture_ = nullptr;
    SDL_GPUSampler* sampler_ = nullptr;
    int width_  = 0;
    int height_ = 0;
};