// ship_animator.hpp - Sistema d'animació de naus 3D per a l'escena de títol
// © 2026 JailDesigner
//
// Manté la mateixa màquina d'estats
// (ENTERING → FLOATING → EXITING) però treballa amb posicions Vec3 i emet
// wireframes a través d'una `Camera3D`. La geometria s'extrau de `ship.shp`
// (P1) i `ship2.shp` (P2) per extrusió en Z.

#pragma once

#include <array>
#include <cstdint>
#include <functional>

#include "core/graphics/camera3d.hpp"
#include "core/graphics/wireframe3d.hpp"
#include "core/rendering/render_context.hpp"
#include "core/types.hpp"

namespace Title {

    enum class ShipState : std::uint8_t {
        ENTERING,
        FLOATING,
        EXITING,
    };

    struct TitleShip {
        int player_id{0};
        ShipState state{ShipState::ENTERING};
        float state_time{0.0F};

        Vec3 initial_position{};
        Vec3 target_position{};
        Vec3 current_position{};

        float initial_scale{1.0F};
        float target_scale{1.0F};
        float current_scale{1.0F};

        float oscillation_phase{0.0F};
        float entry_delay{0.0F};

        float amplitude_x{0.0F};
        float amplitude_y{0.0F};
        float frequency_x{0.0F};
        float frequency_y{0.0F};

        Graphics::Mesh3D mesh;
        // Vector mundial cap a on apunta el front del shape. Recalculat a cada
        // transició d'estat perquè draw() oriente la nau (look-at) en la
        // direcció del seu path actual.
        Vec3 forward_dir{.x = 0.0F, .y = 0.0F, .z = 1.0F};
        bool visible{false};
    };

    class ShipAnimator {
       public:
        ShipAnimator(Rendering::Renderer* renderer, const Graphics::Camera3D* camera);

        void init();
        void update(float delta_time);
        void draw() const;

        void startEntryAnimation();
        void triggerExitAnimation();
        void triggerExitAnimationForPlayer(int player_id);
        void skipToFloatingState();

        void setVisible(bool visible);
        [[nodiscard]] auto isAnimationComplete() const -> bool;
        [[nodiscard]] auto isVisible() const -> bool;

        // Callback disparat quan una nau acaba l'EXITING (es torna invisible
        // al VP). Útil per a un destell que tapi el pop final.
        using ShipDisappearCallback = std::function<void(int player_id)>;
        void setOnShipDisappear(ShipDisappearCallback cb) { on_ship_disappear_ = std::move(cb); }

       private:
        Rendering::Renderer* renderer_;
        const Graphics::Camera3D* camera_;
        std::array<TitleShip, 2> ships_;
        ShipDisappearCallback on_ship_disappear_;

        static void updateEntering(TitleShip& ship, float delta_time);
        static void updateFloating(TitleShip& ship, float delta_time);
        static void updateExiting(TitleShip& ship, float delta_time);
        static void configureShipP1(TitleShip& ship);
        static void configureShipP2(TitleShip& ship);
    };

}  // namespace Title