orni-attack/source/game/entities/enemy.hpp

// enemy.hpp - Clase para enemigos (ORNIs pentágonos)
// © 1999 Visente i Sergi (versión Pascal)
// © 2025 Port a C++20 con SDL3

#pragma once
#include <SDL3/SDL.h>

#include <cmath>
#include <cstdint>

#include "core/defaults.hpp"
#include "core/entities/entity.hpp"
#include "core/types.hpp"
#include "game/constants.hpp"

// Tipo de enemy
enum class EnemyType : uint8_t {
    PENTAGON = 0,  // Pentágono esquivador (zigzag)
    QUADRAT = 1,   // Cuadrado perseguidor (tracks ship)
    MOLINILLO = 2  // Molinillo agressiu (fast, spinning)
};

// Estat de animación (palpitació i rotación accelerada)
struct EnemyAnimation {
        // Palpitation (breathing effect)
        bool palpitacio_activa = false;
        float palpitacio_fase = 0.0F;           // Phase in cycle (0.0-2π)
        float palpitacio_frequencia = 2.0F;     // Hz (cycles per second)
        float palpitacio_amplitud = 0.15F;      // Scale variation (±15%)
        float palpitacio_temps_restant = 0.0F;  // Time remaining (seconds)

        // Rotation acceleration (long-term spin modulation)
        float drotacio_base = 0.0F;      // Base rotation speed (rad/s)
        float drotacio_objetivo = 0.0F;  // Target rotation speed (rad/s)
        float drotacio_t = 0.0F;         // Interpolation progress (0.0-1.0)
        float drotacio_duracio = 0.0F;   // Duration of transition (seconds)
};

class Enemy : public Entities::Entity {
    public:
        Enemy()
            : Entity(nullptr) {}
        Enemy(SDL_Renderer* renderer);

        void init() override { init(EnemyType::PENTAGON, nullptr); }
        void init(EnemyType type, const Vec2* ship_pos = nullptr);
        void update(float delta_time) override;
        void draw() const override;

        // Override: Interfície d'Entity
        [[nodiscard]] bool isActive() const override { return esta_; }

        // Override: Interfície de colisión
        [[nodiscard]] float getCollisionRadius() const override {
            return Defaults::Entities::ENEMY_RADIUS;
        }
        [[nodiscard]] bool isCollidable() const override {
            return esta_ && timer_invulnerabilitat_ <= 0.0F;
        }

        // Getters (API pública sin canvis)
        void destruir() { esta_ = false; }
        [[nodiscard]] float get_drotacio() const { return drotacio_; }
        [[nodiscard]] Vec2 getVelocityVector() const {
            return {
                .x = velocity_ * std::cos(angle_ - (Constants::PI / 2.0F)),
                .y = velocity_ * std::sin(angle_ - (Constants::PI / 2.0F))};
        }

        // Set ship position reference for tracking behavior
        void set_ship_position(const Vec2* ship_pos) { ship_position_ = ship_pos; }

        // [NEW] Getters for stage system (base stats)
        [[nodiscard]] float get_base_velocity() const;
        [[nodiscard]] float get_base_rotation() const;
        [[nodiscard]] EnemyType getType() const { return type_; }

        // [NEW] Setters for difficulty multipliers (stage system)
        void set_velocity(float vel) { velocity_ = vel; }
        void set_rotation(float rot) {
            drotacio_ = rot;
            animacio_.drotacio_base = rot;
        }
        void set_tracking_strength(float strength);

        // [NEW] Invulnerability queries
        [[nodiscard]] bool isInvulnerable() const { return timer_invulnerabilitat_ > 0.0F; }
        [[nodiscard]] float get_temps_invulnerabilitat() const { return timer_invulnerabilitat_; }

    private:
        // Membres específics d'Enemy (heretats: renderer_, shape_, center_, angle_, brightness_)
        float velocity_;
        float drotacio_;  // Delta rotación visual (rad/s)
        float rotacio_;   // Rotación visual acumulada
        bool esta_;

        // [NEW] Enemy type and configuration
        EnemyType type_;

        // [NEW] Animation state
        EnemyAnimation animacio_;

        // [NEW] Behavior state (type-specific)
        float tracking_timer_;       // For Cuadrado: time since last angle update
        const Vec2* ship_position_;  // Pointer to ship position (for tracking)
        float tracking_strength_;    // For Cuadrado: tracking intensity (0.0-1.5), default 0.5

        // [NEW] Invulnerability state
        float timer_invulnerabilitat_;  // Countdown timer (seconds), 0.0f = vulnerable

        // [EXISTING] Private methods
        void mou(float delta_time);

        // [NEW] Private methods
        void actualitzar_animacio(float delta_time);
        void actualitzar_palpitacio(float delta_time);
        void actualitzar_rotacio_accelerada(float delta_time);
        void comportament_pentagon(float delta_time);
        void comportament_quadrat(float delta_time);
        void comportament_molinillo(float delta_time);
        [[nodiscard]] float calcular_escala_actual() const;  // Returns scale with palpitation applied
        bool intent_spawn_safe(const Vec2& ship_pos, float& out_x, float& out_y);
};