orni-attack/source/game/systems/enemy_event_dispatcher.cpp

// enemy_event_dispatcher.cpp - Implementació del dispatcher d'events d'enemic
// © 2026 JailDesigner

#include "game/systems/enemy_event_dispatcher.hpp"

#include <cstdint>

#include "core/defaults.hpp"
#include "core/types.hpp"
#include "game/entities/bullet.hpp"
#include "game/entities/bullet_config.hpp"
#include "game/entities/enemy_config.hpp"

namespace Systems::EnemyEvents {

    namespace {
        constexpr uint8_t NO_SHOOTER = 0xFF;

        void doAddScore(Systems::Collision::Context& ctx, const Enemy& enemy, uint8_t shooter) {
            const int POINTS = enemy.getConfig().score;
            if (shooter != NO_SHOOTER) {
                ctx.score_per_player[shooter] += POINTS;
            }
            ctx.floating_score_manager.crear(POINTS, enemy.getCenter());
        }

        // Helper compartit per CREATE_DEBRIS i CREATE_DEBRIS_PARTIAL: única
        // crida a explode(), paràmetres alineats; només canvia piece_scale
        // (1.0 = explosió completa, 0.3 = xip d'esquerda).
        void spawnDebrisForEnemy(Systems::Collision::Context& ctx, const Enemy& enemy, const Bullet* bullet, float piece_scale) {
            constexpr float SPEED_EXPLOSIO = 80.0F;
            const Vec2 INHERITED_VEL = enemy.getVelocityVector() *
                Defaults::Physics::Debris::ENEMY_VELOCITY_INHERITANCE;
            const Vec2 BULLET_VEL = (bullet != nullptr) ? bullet->getBody().velocity : Vec2{};
            ctx.debris_manager.explode(
                enemy.getShape(),
                enemy.getCenter(),
                0.0F,
                1.0F,
                SPEED_EXPLOSIO,
                enemy.getBrightness(),
                INHERITED_VEL,
                0.0F,
                0.0F,
                Defaults::Sound::EXPLOSION,
                enemy.getConfig().colors.normal,
                Defaults::Physics::Debris::ENEMY_LIFETIME,
                Defaults::Physics::Debris::ENEMY_FRICTION,
                Defaults::Physics::Debris::ENEMY_SEGMENT_MULTIPLIER,
                BULLET_VEL,
                piece_scale);
        }

        void doCreateFireworks(Systems::Collision::Context& ctx, const Enemy& enemy) {
            ctx.firework_manager.spawn(enemy.getCenter(),
                Defaults::FX::Firework::DEFAULT_COLOR,
                Defaults::FX::Firework::SPEED,
                Defaults::FX::Firework::N_POINTS,
                Defaults::FX::Firework::INITIAL_BRIGHTNESS,
                /*glow=*/true,
                enemy.getConfig().colors.wounded);
        }

        void doApplyImpulse(Enemy& enemy, const Bullet* bullet) {
            if (bullet == nullptr) {
                return;
            }
            const Vec2 IMPULSE = bullet->getBody().velocity *
                (bullet->getBody().mass * bullet->getConfig().physics.impact_momentum_factor);
            enemy.applyImpulse(IMPULSE);
        }
    }  // namespace

    void dispatchEvent(Systems::Collision::Context& ctx, Enemy& enemy, EnemyEventType event, uint8_t shooter_id, const Bullet* bullet) {
        const auto& actions = enemy.getConfig().events.getActions(event);

        // Pre-scan: aquest event matarà l'enemic? Si sí, l'impuls de la bala
        // va directament als debris (via doCreateDebris) i NO s'aplica al cos
        // — així evitem el "double-count" on els trossos hereten la velocitat
        // del cos (boostat per la bala) I a més el seu propi impuls de bala.
        // Regla: el bullet impacta al cos O als trossos, mai a tots dos.
        bool will_die = false;
        for (const auto& action : actions) {
            if (action.type == EnemyActionType::DESTROY) {
                will_die = true;
                break;
            }
            if (action.type == EnemyActionType::SET_HURT && enemy.isWounded()) {
                will_die = true;
                break;
            }
        }

        for (const auto& action : actions) {
            // Si una acció prèvia d'aquest chain ha destruït l'enemic
            // (típicament DECREASE_HEALTH→ON_NO_HEALTH→SET_HURT-wounded→DESTROY),
            // saltem la resta — no té sentit aplicar APPLY_IMPULSE o FLASH a un
            // cos ja inactiu.
            if (!enemy.isActive()) {
                break;
            }
            switch (action.type) {
                case EnemyActionType::SET_HURT:
                    if (enemy.isWounded()) {
                        // Segon hit sobre wounded → mort immediata (regla 2-hits).
                        dispatchEvent(ctx, enemy, EnemyEventType::ON_DESTROY, shooter_id, bullet);
                        enemy.destroy();
                    } else {
                        enemy.hurt(shooter_id);
                    }
                    break;
                case EnemyActionType::DESTROY:
                    dispatchEvent(ctx, enemy, EnemyEventType::ON_DESTROY, shooter_id, bullet);
                    enemy.destroy();
                    break;
                case EnemyActionType::ADD_SCORE:
                    doAddScore(ctx, enemy, shooter_id);
                    break;
                case EnemyActionType::CREATE_DEBRIS:
                    spawnDebrisForEnemy(ctx, enemy, bullet, 1.0F);
                    break;
                case EnemyActionType::CREATE_DEBRIS_PARTIAL:
                    spawnDebrisForEnemy(ctx, enemy, bullet, Defaults::Enemies::Debris::PARTIAL_PIECE_SCALE);
                    break;
                case EnemyActionType::CREATE_FIREWORKS:
                    doCreateFireworks(ctx, enemy);
                    break;
                case EnemyActionType::APPLY_IMPULSE:
                    if (!will_die) {
                        doApplyImpulse(enemy, bullet);
                    }
                    break;
                case EnemyActionType::DECREASE_HEALTH:
                    enemy.decrementHealth(shooter_id);
                    if (enemy.getHealth() <= 0) {
                        dispatchEvent(ctx, enemy, EnemyEventType::ON_NO_HEALTH, shooter_id, bullet);
                    }
                    break;
                case EnemyActionType::FLASH:
                    enemy.triggerFlash();
                    break;
            }
        }
    }

}  // namespace Systems::EnemyEvents