sysorbit.h

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/* Conquer Space
 * Copyright (C) 2021-2025 Conquer Space
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
#pragma once
 
#include <unordered_map>
#include <vector>
 
#include "core/components/orbit.h"
#include "core/systems/isimulationsystem.h"
 
namespace cqsp::core::systems {
class SysOrbit : public ISimulationSystem {
 public:
    explicit SysOrbit(Game& game) : ISimulationSystem(game) {}
    void DoSystem() override;
    int Interval() const override { return 1; }
    void Init() override;
 
 private:
    struct BodyCache {
        glm::dvec3 position;
        glm::dvec3 center;
        glm::dvec3 future_position;
        glm::dvec3 future_center;
        double SOI;
        double radius;
    };
 
    void ParseOrbitTree(entt::entity parent, entt::entity body);
    void ComputePosition(entt::entity parent, entt::entity body);
 
    void LeaveSOI(const entt::entity& body, entt::entity& parent, components::types::Orbit& orb,
                  components::types::Kinematics& pos, components::types::Kinematics& p_pos);
 
    bool CheckEnterSOI(const entt::entity& parent, const entt::entity& body, components::types::Kinematics& pos);
 
    bool CrashObject(components::types::Orbit& orb, entt::entity body, components::types::Kinematics& pos,
                     double radius);
 
    void UpdateCommandQueue(components::types::Orbit& orb, entt::entity body, entt::entity parent);
 
    void CalculateImpulse(components::types::Orbit& orb, entt::entity body);
 
    void ParseChildren(entt::entity body);
 
    void EnterSOI(entt::entity entity, entt::entity body, entt::entity parent, components::types::Orbit& orb,
                  components::types::Kinematics& vehicle_position, const components::bodies::Body& body_comp,
                  const components::types::Kinematics& target_position);
    void ComputeCenters(entt::entity entity, glm::dvec3 parent_pos, glm::dvec3 future_parent_pos);
    void CalculatePosition(entt::entity entity, components::types::Orbit& orbit,
                           components::types::Kinematics& kinematics, components::types::FuturePosition& future_pos);
 
    const bool debug_prints = false;
 
    std::unordered_map<entt::entity, BodyCache> body_cache;
};
}  // namespace cqsp::core::systems