ZMMO/Source/ZMMO/Game/Entity/ZMMOPlayerCharacter.h

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Character.h"
#include "Logging/LogMacros.h"
#include "ZMMOEntityInterface.h"
#include "ZMMOEntityTypes.h"
#include "ZMMOPlayerCharacter.generated.h"

class USpringArmComponent;
class UCameraComponent;
class UInputAction;
class UZeusNetworkSubsystem;
struct FInputActionValue;

DECLARE_LOG_CATEGORY_EXTERN(LogZMMOPlayer, Log, All);

/**
 *  AZMMOPlayerCharacter
 *
 *  Personagem do jogador local. Diferente do template `ThirdPersonCharacter`
 *  e do antigo `AZMMOCharacter`, este ator e parte do pipeline de rede Zeus:
 *
 *    - Continua a usar o `UCharacterMovementComponent` LIVRE para correr a
 *      fisica do landscape (ADR 0038): o cliente e autoritativo localmente
 *      sobre Z/colisao com terreno; o servidor apenas valida input/velocidade.
 *    - Envia `C_INPUT_AXIS` ao `UZeusNetworkSubsystem` na cadencia
 *      `InputSendRateHz` (com heartbeat 5 Hz quando parado para evitar
 *      starvation do `MovementSystem` no servidor).
 *    - Implementa `IZMMOEntityInterface` para participar do registry do
 *      `UZMMOWorldSubsystem`, mas `ApplyEntitySnapshot` e `SetEntityRelevant`
 *      sao no-op em V0 — o cliente local nao reconcilia (cliente solto).
 *
 *  TODO V1: reconciliacao opcional XY quando colisao de objetos chegar; AOI
 *  debug spheres; visual smoothing apos correcao do servidor.
 */
UCLASS(Blueprintable, BlueprintType)
class ZMMO_API AZMMOPlayerCharacter : public ACharacter, public IZMMOEntityInterface
{
	GENERATED_BODY()

	/** Camera boom positioning the camera behind the character */
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Components", meta = (AllowPrivateAccess = "true"))
	USpringArmComponent* CameraBoom;

	/** Follow camera */
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Components", meta = (AllowPrivateAccess = "true"))
	UCameraComponent* FollowCamera;

protected:
	UPROPERTY(EditAnywhere, Category = "Input")
	UInputAction* JumpAction;

	UPROPERTY(EditAnywhere, Category = "Input")
	UInputAction* MoveAction;

	UPROPERTY(EditAnywhere, Category = "Input")
	UInputAction* LookAction;

	UPROPERTY(EditAnywhere, Category = "Input")
	UInputAction* MouseLookAction;

	/** Cadencia de envio dos pacotes `C_INPUT_AXIS` (Hz). */
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "ZMMO|Networking", meta = (ClampMin = "1", ClampMax = "120"))
	int32 InputSendRateHz = 30;

	/**
	 *  Intervalo maximo (s) entre envios de `C_INPUT_AXIS` quando os inputs sao
	 *  vazios (forward=0, right=0, sem jump). Mantem ~5 Hz de heartbeat para
	 *  evitar starvation do servidor caso pacotes sejam perdidos. Em movimento
	 *  o envio segue `InputSendRateHz` (30 Hz).
	 */
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "ZMMO|Networking", meta = (ClampMin = "0.05", ClampMax = "5.0"))
	float HeartbeatIntervalSec = 0.2f;

public:
	AZMMOPlayerCharacter();

	virtual void Tick(float DeltaSeconds) override;

	// --- IZMMOEntityInterface ---
	virtual int64 GetZMMOEntityId() const override { return ZMMOEntityId; }
	virtual EZMMOEntityType GetZMMOEntityType() const override { return EZMMOEntityType::Player; }
	virtual void ApplyEntitySnapshot(const FZMMOEntitySnapshot& Snapshot) override;
	virtual void SetEntityRelevant(bool bRelevant) override;

	UFUNCTION(BlueprintCallable, Category = "ZMMO|Entity")
	void SetZMMOEntityId(int64 InEntityId) { ZMMOEntityId = InEntityId; }

	FORCEINLINE USpringArmComponent* GetCameraBoom() const { return CameraBoom; }
	FORCEINLINE UCameraComponent* GetFollowCamera() const { return FollowCamera; }

protected:
	virtual void BeginPlay() override;
	virtual void EndPlay(const EEndPlayReason::Type EndPlayReason) override;

	virtual void SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) override;

	void Move(const FInputActionValue& Value);
	void MoveCompleted(const FInputActionValue& Value);
	void Look(const FInputActionValue& Value);
	void OnJumpPressed();
	void OnJumpReleased();

public:
	/** Wrappers expostos a Blueprint (UI / mobile / automation). */
	UFUNCTION(BlueprintCallable, Category = "Input")
	virtual void DoMove(float Right, float Forward);

	UFUNCTION(BlueprintCallable, Category = "Input")
	virtual void DoLook(float Yaw, float Pitch);

	UFUNCTION(BlueprintCallable, Category = "Input")
	virtual void DoJumpStart();

	UFUNCTION(BlueprintCallable, Category = "Input")
	virtual void DoJumpEnd();

private:
	void ResolveZeusNetworkSubsystem();
	void FlushInputAxisToServer(float DeltaSeconds);

	/** Liga `OnPlayerSpawned` para captar EntityId local apos o handshake. */
	void BindZeusSpawnDelegate();
	void UnbindZeusSpawnDelegate();

	/** Caso o spawn ja tenha chegado antes deste pawn existir, aplica via cache. */
	void TryRegisterLocalEntityFromCachedSpawn();

	/**
	 *  Memoriza `EntityId` autoritativo e regista o pawn no `UZMMOWorldSubsystem`
	 *  para o registry partilhado por proxies remotos (filtra snapshots locais).
	 */
	void HandleLocalSpawnReady(int32 InEntityId, FVector PosCm, float YawDeg, int64 ServerTimeMs);

	UFUNCTION()
	void HandleZeusPlayerSpawned(int32 InEntityId, bool bIsLocal, FVector PosCm, float YawDeg, int64 ServerTimeMs);

	UPROPERTY()
	TObjectPtr<UZeusNetworkSubsystem> ZeusNetwork;

	bool bSpawnDelegateBound = false;

	/** Identidade autoritativa atribuida quando o servidor envia S_SPAWN_PLAYER local. */
	UPROPERTY(VisibleInstanceOnly, BlueprintReadOnly, Category = "ZMMO|Entity", meta = (AllowPrivateAccess = "true"))
	int64 ZMMOEntityId = 0;

	float PendingMoveForward = 0.0f;
	float PendingMoveRight = 0.0f;

	bool bPendingJumpPressed = false;
	bool bPendingJumpReleased = false;
	bool bPreviousJumpHeld = false;
	/** Último estado IsFalling enviado ao servidor. Usado para forçar um envio
	 *  imediato em transições walking↔falling, evitando que o rate limit segure
	 *  a transição até o próximo heartbeat. */
	bool bPreviousFalling = false;

	float SendAccumulatorSec = 0.0f;
	float TimeSinceLastSendSec = 0.0f;
	int32 InputSequence = 0;
};