feat(orb): contra-atac amb bullet_double dirigida al jugador en rebre impacte

source/game/systems/enemy_event_dispatcher.cpp

@@ -3,13 +3,19 @@
 
 #include "game/systems/enemy_event_dispatcher.hpp"
 
+#include <cmath>
 #include <cstdint>
+#include <cstdlib>
 
 #include "core/defaults.hpp"
 #include "core/types.hpp"
+#include "game/constants.hpp"
 #include "game/entities/bullet.hpp"
 #include "game/entities/bullet_config.hpp"
+#include "game/entities/bullet_registry.hpp"
+#include "game/entities/enemy_ai.hpp"
 #include "game/entities/enemy_config.hpp"
+#include "game/entities/ship.hpp"
 
 namespace Systems::EnemyEvents {
 
@@ -72,6 +78,87 @@ namespace Systems::EnemyEvents {
                 (bullet->getBody().mass * bullet->getConfig().physics.impact_momentum_factor);
             enemy.applyImpulse(IMPULSE);
         }
+
+        auto randFloat01() -> float {
+            return static_cast<float>(std::rand()) / static_cast<float>(RAND_MAX);
+        }
+
+        // Còpia local de la mateixa primitiva que viu a enemy_ai_system.cpp.
+        // No s'ha extret a un header compartit perquè és l'únic punt de
+        // duplicació; si apareix un tercer consumidor, refactoritzar.
+        auto findNearestShipPosition(const Enemy& enemy) -> const Vec2* {
+            const Vec2& self = enemy.getCenter();
+            const Vec2* best = nullptr;
+            float best_dist_sq = 0.0F;
+            for (const Ship* ship : enemy.getShips()) {
+                if (ship == nullptr || !ship->isActive()) {
+                    continue;
+                }
+                const Vec2& pos = ship->getCenter();
+                const Vec2 DELTA = pos - self;
+                const float DIST_SQ = DELTA.lengthSquared();
+                if (best == nullptr || DIST_SQ < best_dist_sq) {
+                    best = &pos;
+                    best_dist_sq = DIST_SQ;
+                }
+            }
+            return best;
+        }
+
+        // FIRE_BULLET: paral·lel a doShoot() d'enemy_ai_system.cpp, però disparat
+        // per esdeveniment (típicament on_hit per a contra-atacs) en lloc de
+        // periòdicament. owner_id es deriva de l'índex dins ctx.enemies via
+        // aritmètica de punters (l'array és contigu).
+        void doFireBullet(Systems::Collision::Context& ctx, const Enemy& enemy, const EnemyAction& action) {
+            if (action.bullet_config_name.empty()) {
+                return;
+            }
+            const BulletConfig* cfg = BulletRegistry::get(action.bullet_config_name);
+            if (cfg == nullptr) {
+                return;
+            }
+            Bullet* slot = nullptr;
+            constexpr std::size_t START = Defaults::Entities::ENEMY_BULLET_START_IDX;
+            constexpr std::size_t END = START + Defaults::Entities::MAX_ENEMY_BULLETS;
+            for (std::size_t i = START; i < END; ++i) {
+                if (!ctx.bullets[i].isActive()) {
+                    slot = &ctx.bullets[i];
+                    break;
+                }
+            }
+            if (slot == nullptr) {
+                return;  // pool d'enemic ple
+            }
+
+            float angle = 0.0F;
+            if (action.aim_mode == AimMode::AIMED) {
+                const Vec2* target = findNearestShipPosition(enemy);
+                if (target == nullptr) {
+                    angle = randFloat01() * 2.0F * Constants::PI;
+                } else {
+                    const Vec2 TO = *target - enemy.getCenter();
+                    angle = std::atan2(TO.y, TO.x) + (Constants::PI / 2.0F);
+                }
+            } else {
+                angle = randFloat01() * 2.0F * Constants::PI;
+            }
+            if (action.jitter_rad > 0.0F) {
+                angle += (randFloat01() - 0.5F) * 2.0F * action.jitter_rad;
+            }
+
+            // Localitzem l'índex de l'enemic per construir l'owner_id. Evitem
+            // aritmètica de punters sobre Enemy (tipus polimòrfic — UB si la
+            // jerarquia canvia); cerca lineal a l'array (mida petita, no és hot path).
+            std::size_t enemy_index = 0;
+            for (std::size_t i = 0; i < ctx.enemies.size(); ++i) {
+                if (&ctx.enemies[i] == &enemy) {
+                    enemy_index = i;
+                    break;
+                }
+            }
+            const auto OWNER = static_cast<uint8_t>(Defaults::Entities::ENEMY_OWNER_BASE + enemy_index);
+            slot->fire(enemy.getCenter(), angle, OWNER, action.bullet_speed, cfg);
+        }
     }  // namespace
 
     void dispatchEvent(Systems::Collision::Context& ctx, Enemy& enemy, EnemyEventType event, uint8_t shooter_id, const Bullet* bullet) {
@@ -153,6 +240,9 @@ namespace Systems::EnemyEvents {
                 case EnemyActionType::FLASH:
                     enemy.triggerFlash();
                     break;
+                case EnemyActionType::FIRE_BULLET:
+                    doFireBullet(ctx, enemy, action);
+                    break;
             }
         }
     }