KlassischeKeplerKriege/game/state/missile.hpp

#pragma once

#include <glm/vec2.hpp>
#include <glm/vec3.hpp>

namespace game {
    class State;
    class Ship;
    class Planet;
    class Player;
    class State;
    class Trace;

    // missile belongs to a player and optionally fills a trace behind it.
    // trace then belongs to the player.
    class Missile {
    public:
        enum class HitObject {
            Nothing,
            HitPlayer,
            HitPlanet,
            // HitMissile,
            LeftUniverse
        };

        // missile advances to pos. if hit != Nothing, it hits something and
        // stops existing afterwards.
        class Event {
        public:
            Event(const glm::vec2 &pos) : Event(pos, HitObject::Nothing)
            {
            }

            Event(const glm::vec2 &pos, HitObject hit)
                : hit(hit), pos(pos)
            {
            }

            Event(const glm::vec2 &pos, int playerIdKiller, int playerIdVictim)
                : Event(pos, HitObject::HitPlayer)
            {
                  this->playerIdKiller = playerIdKiller;
                  this->playerIdVictim = playerIdVictim;
            }

            HitObject hit;
            glm::vec2 pos;

            int playerIdKiller;
            int playerIdVictim;
        };

        Missile(Player *player, const glm::vec2 &pos, float angle, float speed);
        ~Missile();

        // try to advance. if something will be hit, return the first hit in
        // time.
        Missile::Event advance(const game::State *state, float dt);

        Player   *player; // owner won't be hit by own missiles
        glm::vec2 position;
        glm::vec2 velocity;
        Trace    *trace;
    };
}