#ifndef MODEL_COMPONENT_H
#define MODEL_COMPONENT_H

#include <glm/glm.hpp>
#include <string>
#include <vector>
#include <GL/glew.h>

// Structure representing a single vertex.
struct Vertex {
    glm::vec3 Position;
    glm::vec3 Normal;
    glm::vec2 TexCoords;
    glm::vec3 Tangent;
};

// Structure representing a sub-mesh (a group of faces sharing the same material)
struct SubMesh {
    std::vector<Vertex> vertices;
    std::vector<GLuint> indices;
    glm::vec3 diffuseColor;
    glm::vec3 specularColor;
    float shininess;
    GLuint diffuseTexture;
    GLuint VAO, VBO, EBO;

    SubMesh()
        : diffuseColor(1.0f,1.0f,1.0f),
          specularColor(1.0f,1.0f,1.0f),
          shininess(32.0f),
          diffuseTexture(0),
          VAO(0), VBO(0), EBO(0)
    {}
};

class ModelComponent {
public:
    ModelComponent();
    ~ModelComponent();

    // Base model path.
    std::string modelPath;
    // Submeshes
    std::vector<SubMesh> meshes;

    // Functions.
    bool LoadModel(const std::string &filepath);
    void Draw();

    // Texture loading.
    bool LoadDiffuseTexture(const std::string &filepath, GLuint &textureID);
    bool LoadNormalTexture(const std::string &filepath);
    
    // Setup mesh for a submesh.
    void SetupMesh(SubMesh &mesh);
    
    // (Optional) Global material properties if needed.
    glm::vec3 diffuseColor;
    glm::vec3 specularColor;
    float shininess;
};

#endif // MODEL_COMPONENT_H