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#pragma once
#include <vector>
#include "../types.h"
namespace crepe {
class ScriptSystem;
class BehaviorScript;
class ComponentManager;
/**
* \brief Script interface
*
* This class is used as a base class for user-defined scripts that can be added to game
* objects using the \c BehaviorScript component.
*
* \note Additional *events* (like Unity's OnDisable and OnEnable) should be implemented as
* member or lambda methods in derivative user script classes and registered in \c init().
*/
class Script {
protected:
/**
* \brief Script initialization function
*
* This function is called during the ScriptSystem::update() routine *before*
* Script::update() if it (a) has not yet been called and (b) the \c BehaviorScript component
* holding this script instance is active.
*/
virtual void init() {}
/**
* \brief Script update function
*
* This function is called during the ScriptSystem::update() routine if the \c BehaviorScript
* component holding this script instance is active.
*/
virtual void update() {}
//! ScriptSystem calls \c init() and \c update()
friend class crepe::ScriptSystem;
protected:
/**
* \brief Get single component of type \c T on this game object (utility)
*
* \tparam T Type of component
*
* \returns Reference to component
*
* \throws nullptr if this game object does not have a component matching type \c T
*/
template <typename T>
T & get_component() const;
// TODO: make get_component calls for component types that can have more than 1 instance
// cause compile-time errors
/**
* \brief Get all components of type \c T on this game object (utility)
*
* \tparam T Type of component
*
* \returns List of component references
*/
template <typename T>
std::vector<std::reference_wrapper<T>> get_components() const;
/**
* \brief Gets game object id this script is attached to
*
* \returns game object id
*/
game_object_id_t get_game_object_id() const {return this->game_object_id;};
protected:
// NOTE: Script must have a constructor without arguments so the game programmer doesn't need
// to manually add `using Script::Script` to their concrete script class.
Script() = default;
//! Only \c BehaviorScript instantiates Script
friend class BehaviorScript;
private:
// These references are set by BehaviorScript immediately after calling the constructor of
// Script.
game_object_id_t game_object_id = -1;
ComponentManager * component_manager_ref = nullptr;
// TODO: use OptionalRef instead of pointer
private:
//! Flag to indicate if \c init() has been called already
bool initialized = false;
};
} // namespace crepe
#include "Script.hpp"
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