module ecs.system;

import ecs.entity;
import ecs.manager;

struct System
{
    bool enabled()
    {
        return m_enabled;
    }

    void enable()
    {
        if (!m_enabled && m_enable)
            m_enable(m_system_pointer);
        m_enabled = true;
    }

    void disable()
    {
        if (m_enabled && m_disable)
            m_disable(m_system_pointer);
        m_enabled = false;
    }

    int priority()
    {
        return m_priority;
    }

package:

    ///should system update and catch events?
    bool m_enabled = false;
    ///system priority
    int m_priority;
    ///pointer to system implementation
    void* m_system_pointer;

    ushort[] m_components;
    ushort[] m_optional_components;

    //void function(ref EntityManager.CallData data, void* entity) update;
    void* m_update; ///workaroud for DMD bug with upper line

    void function(void* system_pointer) m_enable;
    void function(void* system_pointer) m_disable;

    void function(void* system_pointer) m_create;
    void function(void* system_pointer) m_destroy;

    void function(void* system_pointer) m_begin;
    void function(void* system_pointer) m_end;
}