#pragma once
// Client view of a safari zone: builds the HD-2D diorama from the shared
// Zone layout, predicts the local player, interpolates every networked
// entity, and turns server events into effects (grass bursts, splashes,
// capsule throws, fishing bobbers).

#include "CharacterSprite.h"
#include "Common.h"
#include "Movement.h"
#include "NetClient.h"
#include "Roster.h"
#include "Zone.h"

#include "hd2d/Billboard.h"
#include "hd2d/Camera.h"
#include "hd2d/DayCycle.h"
#include "hd2d/GroundOcclusion.h"
#include "hd2d/Model.h"
#include "hd2d/Particles.h"
#include "hd2d/Scene.h"
#include "hd2d/SpriteAtlas.h"
#include "hd2d/Terrain.h"
#include "hd2d/Water.h"
#include "hd2d/Weather.h"

#include <deque>
#include <map>
#include <memory>
#include <unordered_map>
#include <vector>

namespace bs {

struct FrameInput {
    glm::vec2 move{0.0f};  // camera-relative: x = screen right, y = screen up
    bool run = false;
};

class World {
public:
    bool init();  // static assets (models, textures, character art, roster); once per process
    bool buildZone(const std::string& id, uint32_t seed);
    const Zone& zone() const { return zone_; }
    bool zoneBuilt() const { return built_; }

    // Online: consume snapshots/events and predict the local player.
    void update(float dt, float time, const FrameInput& in, NetClient& net, const hd2d::Camera& cam);
    // Offline backdrop (title screen): just animate the scene at a fixed hour.
    void updateBackdrop(float dt, float time, float hour, Weather w);
    void reset();  // forget all entities (on disconnect)

    // Gameplay queries for the HUD / input handling.
    glm::vec3 localPos() const { return localRender_; }
    float localYaw() const { return predicted_.yaw; }
    bool localSpawned() const { return localSpawned_; }
    uint32_t targetCreature() const { return target_; }
    uint32_t nearbyNpc() const;          // Henry when in talking range, else 0
    bool canFish(glm::vec2& bobber) const;
    bool lineOut() const;                // the local player's fishing line is in the water
    bool biting() const { return biteTimer_ > 0.0f; }
    float hour() const { return hour_; }
    Weather weatherState() const { return weatherState_; }

    // Character preview / creator.
    const CharacterArt& characterArt() const { return charArt_; }
    const CharacterManifest& manifest() const { return manifest_; }
    const Roster& roster() const { return roster_; }

    // Screen-space labels (players, Henry, the targeted creature).
    struct Label {
        glm::vec3 world;
        std::string text;
        uint32_t accent;
        bool chat = false;
        uint32_t entity = 0;  // players: App fills the name from NetClient::players
    };
    std::vector<Label> labels() const;
    void showChatBubble(uint32_t entity, const std::string& text);

    hd2d::Scene scene;
    hd2d::Weather weather;
    hd2d::DayCycle day;

private:
    struct Snap {
        float tick;
        EntityState s;
    };
    struct Visual {
        uint32_t id = 0;
        EntityKind kind = EntityKind::Wild;
        uint16_t species = 0;
        uint32_t owner = 0;
        std::deque<Snap> history;
        glm::vec3 pos{0.0f}, lastPos{0.0f};
        float yaw = 0.0f;
        Anim anim = Anim::Idle;
        float walkPhase = 0.0f, speed = 0.0f;
        float flip = 0.0f, flipTarget = 0.0f, turnAnim = 0.0f;  // paper-turn when flipping
        float born = -1.0f, lastSeen = 0.0f, flash = 0.0f, hide = 0.0f;
        int atlasSlot = -1;
        std::string chat;
        float chatAge = 1e9f;
    };
    struct PlayerArt {
        Appearance look;
        std::unique_ptr<hd2d::BillboardBatch> batch;
    };
    struct Capsule {
        uint32_t thrower = 0, target = 0;
        glm::vec3 from, to;
        float start = 0.0f, flight = 0.5f;
        int result = -1;  // -1 pending, 0 fail, 1 success
        float resultAt = 0.0f;
    };
    struct Bobber {
        uint32_t player = 0;
        glm::vec3 pos;
        float bite = -1.0f;  // time of the last bite
    };

    void buildTerrain();
    void buildProps();
    void buildDecor();
    void applySnapshots(NetClient& net);
    void handleEvent(const GameEvent& e, NetClient& net);
    void predict(float dt, const FrameInput& in, NetClient& net, const hd2d::Camera& cam);
    void sampleEntities(float dt);
    void updateDayWeather(float dt);
    void updateSprites(float dt, const hd2d::Camera& cam, NetClient* net);
    void updateLights();
    int creatureSlot(uint16_t species);
    hd2d::BillboardBatch* playerBatch(uint32_t entity, const NetClient& net);
    void drawCharacter(hd2d::BillboardBatch& batch, glm::vec3 pos, float yaw, bool moving, bool running,
                       float phase, const hd2d::Camera& cam, int anchorRow, float alpha = 1.0f);
    float groundAt(glm::vec2 p) const { return zone_.groundHeight(p); }

    // static assets
    hd2d::ModelLibrary scenery_, safari_;
    CharacterManifest manifest_;
    CharacterArt charArt_;
    Roster roster_;
    hd2d::Image henryImage_;
    bool assetsLoaded_ = false;

    // zone
    Zone zone_;
    bool built_ = false;
    hd2d::Terrain terrain_;
    hd2d::Water water_;
    std::unique_ptr<hd2d::ParticleSystem> particles_;
    hd2d::GroundOcclusion groundAO_;
    std::map<std::string, std::unique_ptr<hd2d::ModelBatch>> models_;
    hd2d::BillboardBatch tallGrass_, tufts_, flowers_;
    std::vector<hd2d::PointLight> lampLights_;

    // entities
    std::unordered_map<uint32_t, Visual> visuals_;
    std::unordered_map<uint32_t, PlayerArt> playerArt_;
    hd2d::BillboardBatch henry_;
    hd2d::SpriteAtlas creatureAtlas_;
    hd2d::BillboardBatch creatures_;
    std::unordered_map<uint16_t, int> speciesSlot_;
    std::unordered_map<int, float> slotUsed_;  // LRU stamp
    hd2d::SpriteAtlas fxAtlas_;
    hd2d::BillboardBatch fx_;
    int fxCapsule_ = -1, fxBobber_ = -1, fxDot_ = -1;
    std::vector<Capsule> capsules_;
    std::vector<Bobber> bobbers_;

    // local prediction
    uint32_t localId_ = 0;
    bool localSpawned_ = false;
    MoveState predicted_, prevPredicted_;
    std::deque<InputCmd> pending_;
    uint32_t inputSeq_ = 0;
    float tickAccum_ = 0.0f;
    glm::vec2 correction_{0.0f};
    glm::vec3 localRender_{0.0f};
    float localPhase_ = 0.0f;
    Anim localServerAnim_ = Anim::Idle;
    float serverTick_ = 0.0f;
    bool haveTick_ = false;
    uint32_t target_ = 0;
    float biteTimer_ = 0.0f;
    float stepTimer_ = 0.0f;

    float time_ = 0.0f;
    float hour_ = 12.0f, hourShown_ = -1.0f;
    Weather weatherState_ = Weather::Clear;
};

}  // namespace bs