simian/include/ECSComponents.h

#pragma once
#include "raylib.h"
#include "raymath.h"
#include "entt.hpp"
#include <string>
#include <unordered_map>

// ECSTransform component - position, rotation, scale, and cached local matrix
struct ECSTransform {
    Vector3 position;
    Vector3 rotation; // Euler rotation (radians)
    Vector3 scale;
    Matrix localMatrix;
    
    ECSTransform() 
        : position{0.0f, 0.0f, 0.0f}
        , rotation{0.0f, 0.0f, 0.0f}
        , scale{1.0f, 1.0f, 1.0f}
        , localMatrix(MatrixIdentity()) {}
    
    ECSTransform(Vector3 pos, Vector3 scl, Vector3 rot)
        : position(pos), rotation(rot), scale(scl), localMatrix(MatrixIdentity()) {}

    ECSTransform(Vector3 pos, Vector3 scl = {1.0f, 1.0f, 1.0f}, float rotY = 0.0f)
        : position(pos)
        , rotation{0.0f, rotY, 0.0f}
        , scale(scl)
        , localMatrix(MatrixIdentity()) {}
};

// Velocity component - for movement
struct Velocity {
    Vector3 linear;   // Linear velocity (units per second)
    float angular;    // Angular velocity (radians per second)
    
    Velocity() 
        : linear{0.0f, 0.0f, 0.0f}
        , angular(0.0f) {}
    
    Velocity(Vector3 lin, float ang = 0.0f)
        : linear(lin), angular(ang) {}
};

// ModelRenderer component - 3D model rendering data
struct ModelRenderer {
    size_t modelId;          // Index into models array
    Color color;          // Tint color
    float outlineSize;    // Outline thickness
    unsigned int shaderId;   // Shader to use (0 = no shader)
    
    ModelRenderer() 
        : modelId(0)
        , color(WHITE)
        , outlineSize(0.0f)
        , shaderId(0) {}
    
    ModelRenderer(int model, Color col = WHITE, float outline = 0.0f, unsigned int shader = 0)
        : modelId(model), color(col), outlineSize(outline), shaderId(shader) {}
};

// Texture component - material texture reference
struct TextureComponent {
    unsigned int textureId;

    TextureComponent() : textureId(0) {}
    TextureComponent(unsigned int id) : textureId(id) {}
};

// UV transform component - tiling and offset for texture sampling
struct UVTransform {
    Vector2 scale;
    Vector2 offset;
    float rotation;

    UVTransform()
        : scale{1.0f, 1.0f}
        , offset{0.0f, 0.0f}
        , rotation(0.0f) {}

    UVTransform(Vector2 s, Vector2 o = {0.0f, 0.0f}, float r = 0.0f)
        : scale(s), offset(o), rotation(r) {}
};

// Tag component - simple string identifier
struct Tag {
    std::string name;
    
    Tag() : name("") {}
    Tag(const std::string& n) : name(n) {}
};

// ScriptComponent - per-entity script reference
struct ScriptComponent {
    std::string scriptPath;
    bool enabled = true;
    bool started = false;
    // Optional: name of the script class to instantiate. If empty, engine
    // will attempt to pick a reasonable object type from the module.
    std::string className;
    // Opaque pointer to the script object instance (asIScriptObject*).
    void* scriptInstance = nullptr;
    // Persisted overrides for editable script fields (name -> raw value string).
    std::unordered_map<std::string, std::string> scriptOverrides;
};

// SceneEntity component - marks entities owned by the scene
struct SceneEntity {
    bool persistent = false;
    std::string id;
};

// Hierarchy component - parent/child links using EnTT-friendly linked list
struct Hierarchy {
    entt::entity parent{entt::null};
    entt::entity first{entt::null};
    entt::entity prev{entt::null};
    entt::entity next{entt::null};
};

// WorldTransform component - computed from hierarchy + local transform
struct WorldTransform {
    Vector3 position;
    Vector3 rotation; // Euler rotation (radians)
    Vector3 scale;
    Matrix worldMatrix;

    WorldTransform()
        : position{0.0f, 0.0f, 0.0f}
        , rotation{0.0f, 0.0f, 0.0f}
        , scale{1.0f, 1.0f, 1.0f}
        , worldMatrix(MatrixIdentity()) {}
};

// Camera3D component - camera settings
struct Camera3DComponent {
    Vector3 position;
    Vector3 target;
    Vector3 up;
    float fovy;
    int projection;  // 0 = CAMERA_PERSPECTIVE, 1 = CAMERA_ORTHOGRAPHIC
    
    Camera3DComponent()
        : position{0.0f, 10.0f, 10.0f}
        , target{0.0f, 0.0f, 0.0f}
        , up{0.0f, 1.0f, 0.0f}
        , fovy(45.0f)
        , projection(0) {}
};

// Light component - directional light
struct LightComponent {
    Vector3 direction;
    Color color;
    float intensity;
    
    LightComponent()
        : direction{0.5f, 0.7f, 0.3f}
        , color(WHITE)
        , intensity(1.0f) {}
};

// Material component - references shader and material managers
struct MaterialComponent {
    unsigned int materialId;  // ID in MaterialManager
    
    MaterialComponent() : materialId(0) {}
    MaterialComponent(unsigned int id) : materialId(id) {}
};

// RenderPass component - controls rendering order and properties
struct RenderPassComponent {
    int order;              // Render order (lower = earlier)
    bool depthTest;         // Enable depth testing
    bool depthWrite;        // Enable depth writing
    unsigned int shaderId;  // Override shader for this pass (0 = use material shader)
    
    RenderPassComponent()
        : order(0)
        , depthTest(true)
        , depthWrite(true)
        , shaderId(0) {}
};