#pragma once

#include "CoreMinimal.h"
#include "Core/DescentHandle.h"
#include "Core/DescentWorldSubsystem.h"
#include "DescentBio.generated.h"

class ADescentCarrier;
class ADescentCharacter;
class UInstancedStaticMeshComponent;
class UMaterialInstanceDynamic;
class UStaticMeshComponent;

/** The numbers of the biomass reserve (M8, requirements U2, U3; DESIGN_UE.md section 6.9). 1 FU = 25 points of nutrition = 10 minutes of life. */
namespace Descent::Bio
{
	constexpr double CapFU = 20.0, StartFU = 6.0;
	constexpr double NutritionPerFU = 25.0;
	constexpr double EmptyBelowFU = 0.1;
	constexpr double JackTotalSec = 4.8, FeedFromSec = 1.0, FeedToSec = 4.1;
	constexpr double JackFeeCr = 12.0;
	constexpr double PieceFU = 0.05, PipeFeedEverySec = 0.1, PipeSpeedMps = 6.0;
	/** What a jack-in does: the nutrition it ends at and the reserve it uses. */
	THEDESCENT_API void FeedPlan(double Nutrition, double ReserveFU, double& OutTarget, double& OutUsedFU);
	/** FU of one fauna item ("silverfin", "lanternfish", "jelly", "polyp"); 0 for anything else. */
	THEDESCENT_API double FaunaValue(FName Item);
	THEDESCENT_API const TArray<FVector>& BioPipeRouteM();
}

/** The carrier's finite nutrient reserve: the wall ports draw from it, collected fauna refills it (through the bio pipe from a docked Tender, or by hand at the vat). */
UCLASS()
class THEDESCENT_API UDescentBioSubsystem : public UDescentWorldSubsystem
{
	GENERATED_BODY()

public:
	static UDescentBioSubsystem* Get(const UWorld* World);
	virtual void OnWorldBeginPlay(UWorld& InWorld) override;
	virtual void Deinitialize() override;

	double ReserveFU = Descent::Bio::StartFU;
	/** Adds to the reserve up to the capacity; returns what went in. */
	double AddFU(double Fu);

	/** E at a wall port: the 4.8 s plug sequence (the arm plays it). Refused when the reserve is empty or the player is full. */
	bool BeginJackIn(ADescentCharacter* User, const FVector& PortLocalM, double PortYawDeg, FString* OutWhyNot = nullptr);
	bool IsJackActive() const { return JackT >= 0.0; }
	double JackTime() const { return JackT; }
	/** E at the vat: loads the fauna the player carries. Returns the FU loaded (0: nothing to load, the window opens instead). */
	double UseVat(ADescentCharacter* User);
	/** E at a bed or bunk: +2 h, refinery +120 s, health 100, nutrition -10 (not below 8), Tenders charged and repaired, autosave. */
	void Sleep(ADescentCharacter* User);

	int32 PortRefused = 0, Feeds = 0, Sleeps = 0;
	double PipedFU = 0.0, HandFU = 0.0, LastUsedFU = 0.0;
	int32 PipePieces() const { return Pieces.Num(); }

private:
	void Step(double Dt);
	void EnsureVisuals();
	void UpdateVisuals();

	double JackT = -1.0, JackN0 = 0.0, JackTarget = 0.0, JackUsed = 0.0;
	TWeakObjectPtr<ADescentCharacter> JackUser;
	TArray<double> Pieces;
	double FeedTimer = 0.0;
	FDescentHandle StepHandle;
	UPROPERTY(Transient) TObjectPtr<AActor> Visual;
	UPROPERTY(Transient) TObjectPtr<UStaticMeshComponent> Liquid;
	UPROPERTY(Transient) TObjectPtr<UInstancedStaticMeshComponent> PieceMesh;
	UPROPERTY(Transient) TArray<TObjectPtr<UMaterialInstanceDynamic>> RingMIDs;
};