blaster/Source/Blaster/Components/CombatComponent.cpp

// Fill out your copyright notice in the Description page of Project Settings.


#include "CombatComponent.h"

#include "Blaster/Character/BlasterCharacter.h"
#include "Blaster/HUD/BlasterHUD.h"
#include "Blaster/PlayerController/BlasterPlayerController.h"
#include "Blaster/Weapon/Weapon.h"
#include "Engine/SkeletalMeshSocket.h"
#include "GameFramework/CharacterMovementComponent.h"
#include "Kismet/GameplayStatics.h"
#include "Net/UnrealNetwork.h"

UCombatComponent::UCombatComponent()
{
	PrimaryComponentTick.bCanEverTick = true;

	BaseWalkSpeed = 600.f;
	AimWalkSpeed = 350.f;
}

void UCombatComponent::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
	Super::GetLifetimeReplicatedProps(OutLifetimeProps);

	DOREPLIFETIME(UCombatComponent, EquippedWeapon);
	DOREPLIFETIME(UCombatComponent, bAiming);
}

void UCombatComponent::BeginPlay()
{
	Super::BeginPlay();

	if (Character)
	{
		Character->GetCharacterMovement()->MaxWalkSpeed = BaseWalkSpeed;
	}
}

void UCombatComponent::TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction)
{
	Super::TickComponent(DeltaTime, TickType, ThisTickFunction);

	SetHUDCrosshairs(DeltaTime);
}

void UCombatComponent::SetHUDCrosshairs(float DeltaTime)
{
	if (Character == nullptr || Character->Controller == nullptr) return;

	Controller = Controller == nullptr ? Cast<ABlasterPlayerController>(Character->Controller) : Controller;
	if (Controller)
	{
		HUD = HUD == nullptr ? Cast<ABlasterHUD>(Controller->GetHUD()) : HUD;
		if (HUD)
		{
			FHUDPackage HUDPackage;

			if (EquippedWeapon)
			{
				HUDPackage.CrosshairsCenter = EquippedWeapon->CrosshairsCenter;
				HUDPackage.CrosshairsLeft = EquippedWeapon->CrosshairsLeft;
				HUDPackage.CrosshairsRight = EquippedWeapon->CrosshairsRight;
				HUDPackage.CrosshairsTop = EquippedWeapon->CrosshairsTop;
				HUDPackage.CrosshairsBottom = EquippedWeapon->CrosshairsBottom;
			}
			else
			{
				HUDPackage.CrosshairsCenter = nullptr;
				HUDPackage.CrosshairsLeft = nullptr;
				HUDPackage.CrosshairsRight = nullptr;
				HUDPackage.CrosshairsTop = nullptr;
				HUDPackage.CrosshairsBottom = nullptr;
			}

			// Calculate crosshair spread
			// Velocity [0, 600] -> Spread [0, 1]
			const FVector2D WalkSpeedRange(0.f, Character->GetCharacterMovement()->MaxWalkSpeed);
			const FVector2D VelocityMultiplierRange(0.f, 1.f);
			FVector Velocity = Character->GetVelocity();
			Velocity.Z = 0.f;

			CrosshairVelocityFactor = FMath::GetMappedRangeValueClamped(WalkSpeedRange, VelocityMultiplierRange, Velocity.Size());
			
			if (Character->GetCharacterMovement()->IsFalling())
			{
				CrosshairInAirFactor = FMath::FInterpTo(CrosshairInAirFactor, 2.25f, DeltaTime, 2.25f);
			}
			else
			{
				CrosshairInAirFactor = FMath::FInterpTo(CrosshairInAirFactor, 0.f, DeltaTime, 30.f);
			}

			HUDPackage.CrosshairSpread = CrosshairVelocityFactor + CrosshairInAirFactor;
			HUD->SetHUDPackage(HUDPackage);
		}
	}
}

void UCombatComponent::SetAiming(bool bIsAiming)
{
	bAiming = bIsAiming;
	ServerSetAiming(bIsAiming);
	if (Character)
	{
		Character->GetCharacterMovement()->MaxWalkSpeed = bIsAiming ? AimWalkSpeed : BaseWalkSpeed;
	}
}

void UCombatComponent::ServerSetAiming_Implementation(bool bIsAiming)
{
	bAiming = bIsAiming;
	if (Character)
	{
		Character->GetCharacterMovement()->MaxWalkSpeed = bIsAiming ? AimWalkSpeed : BaseWalkSpeed;
	}
}

void UCombatComponent::OnRep_EquippedWeapon()
{
	if (EquippedWeapon && Character)
	{
		Character->GetCharacterMovement()->bOrientRotationToMovement = false;
		Character->bUseControllerRotationYaw = true;
	}
}

void UCombatComponent::FireButtonPressed(bool bPressed)
{
	bFireButtonPressed = bPressed;

	if (bFireButtonPressed)
	{
		FHitResult HitResult;
		TraceUnderCrosshairs(HitResult);
		ServerFire(HitResult.ImpactPoint);
	}
}

void UCombatComponent::TraceUnderCrosshairs(FHitResult& TraceHitResult)
{
	FVector2d ViewPortSize;
	if (GEngine && GEngine->GameViewport)
	{
		GEngine->GameViewport->GetViewportSize(ViewPortSize);
	}

	FVector2d CrosshairLocation(ViewPortSize.X / 2.f, ViewPortSize.Y / 2.0f);
	FVector CrosshairWorldPosition;
	FVector CrosshairWorldDirection;
	bool bScreenToWorld = UGameplayStatics::DeprojectScreenToWorld(
		UGameplayStatics::GetPlayerController(this, 0),
		CrosshairLocation,
		CrosshairWorldPosition,
		CrosshairWorldDirection
	);

	if (bScreenToWorld)
	{
		FVector Start = CrosshairWorldPosition;
		FVector End = Start + CrosshairWorldDirection * TRACE_LENGTH;

		GetWorld()->LineTraceSingleByChannel(
			TraceHitResult,
			Start,
			End,
			ECollisionChannel::ECC_Visibility
		);
	}
}

void UCombatComponent::ServerFire_Implementation(const FVector_NetQuantize& TraceHitTarget)
{
	MulticastFire(TraceHitTarget);
}

void UCombatComponent::MulticastFire_Implementation(const FVector_NetQuantize& TraceHitTarget)
{
	if (EquippedWeapon == nullptr) return;
	if (Character)
	{
		Character->PlayFireMontage(bAiming);
		EquippedWeapon->Fire(TraceHitTarget);
	}
}

void UCombatComponent::EquipWeapon(AWeapon* WeaponToEquip)
{
	if (Character == nullptr || WeaponToEquip == nullptr) return;

	EquippedWeapon = WeaponToEquip;
	EquippedWeapon->SetWeaponState(EWeaponState::EWS_Equipped);
	const USkeletalMeshSocket* HandSocket = Character->GetMesh()->GetSocketByName(FName("RightHandSocket"));
	if (HandSocket)
	{
		HandSocket->AttachActor(EquippedWeapon, Character->GetMesh());
	}
	EquippedWeapon->SetOwner(Character);
	Character->GetCharacterMovement()->bOrientRotationToMovement = false;
	Character->bUseControllerRotationYaw = true;
}