#pragma once
#include <string>
#include <vector>
#include "vde/foundation/math_types.h"

namespace vde::foundation {

struct ObjMeshData {
    std::vector<Point3D> vertices;
    std::vector<Point2D> texcoords;
    std::vector<Vector3D> normals;

    /// Vertex indices per face (0-based internally).
    /// Always populated regardless of face format.
    std::vector<std::vector<int>> faces;

    /// Texcoord indices per face (0-based). Empty if the file had no vt data.
    /// Same length as faces; each sub-vector same length as corresponding face.
    std::vector<std::vector<int>> face_texcoords;

    /// Normal indices per face (0-based). Empty if the file had no vn data.
    std::vector<std::vector<int>> face_normals;

    /// Material name per face group (appears before the faces that use it).
    /// The i-th entry gives the material active for the i-th face.
    std::vector<std::string> face_materials;

    /// Helpers
    [[nodiscard]] bool has_texcoords() const { return !texcoords.empty(); }
};

ObjMeshData read_obj(const std::string& filepath);
void write_obj(const std::string& filepath, const ObjMeshData& data);

}  // namespace vde::foundation