#pragma once
// Small client-wide helpers: asset paths, UI textures, color conversion.

#include "hd2d/GL.h"
#include "Paths.h"

#include "hd2d/Texture.h"

#include <imgui.h>

#include <glm/glm.hpp>

#include <cstdint>
#include <string>

#ifndef HD2D_ENGINE_ASSET_DIR
#define HD2D_ENGINE_ASSET_DIR "../Vibe-HD-2D/assets"
#endif

namespace bs {

// Game assets: `<exe dir>/assets` in a release package, else the source checkout (see Paths.h).
inline std::string gameAsset(const std::string& rel) { return gameAssetDir() + "/" + rel; }
// Engine shaders, fonts, textures, models: `<exe dir>/engine` in a release package, else the
// engine checkout baked in by CMake.
const std::string& engineAssetDir();
inline std::string engineAsset(const std::string& rel) { return engineAssetDir() + "/" + rel; }

constexpr float kPixelsPerUnit = 32.0f;     // world texel density shared by all pixel art
constexpr float kCreaturePixelsPerUnit = 40.0f;  // creatures render a bit smaller than trainers

inline ImU32 imColor(uint32_t rgb, int alpha = 255) {
    return IM_COL32((rgb >> 16) & 255, (rgb >> 8) & 255, rgb & 255, alpha);
}
inline glm::vec3 linearColor(uint32_t rgb) {
    auto f = [](uint32_t c) { float v = float(c & 255) / 255.0f; return v * v * (0.8f + 0.2f * v); };
    return {f(rgb >> 16), f(rgb >> 8), f(rgb)};
}

// Plain RGBA8 (not sRGB), nearest-filtered texture for ImGui images: pixel art
// previews and icons stay crisp and show their authored colors.
class UiTexture {
public:
    UiTexture() = default;
    UiTexture(const UiTexture&) = delete;
    UiTexture& operator=(const UiTexture&) = delete;
    ~UiTexture() { reset(); }
    // `img` uses the engine convention (row 0 = bottom); ImGui uv (0,0) is the top-left.
    void upload(const hd2d::Image& img);
    void reset();
    ImTextureID id() const { return ImTextureID(intptr_t(id_)); }
    bool valid() const { return id_ != 0; }
    glm::ivec2 size() const { return size_; }
    // ImGui uv rect of a grid cell (top-left origin, rows counted from the top).
    void cellUV(glm::ivec2 cell, int col, int row, ImVec2& uv0, ImVec2& uv1) const;

private:
    GLuint id_ = 0;
    glm::ivec2 size_{0};
};

float wrapAngle(float a);  // to (-pi, pi]

}  // namespace bs