Shotgun.cpp

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


#include "Shotgun.h"
#include "Engine/SkeletalMeshSocket.h"
#include "Kismet/GameplayStatics.h"
#include "Kismet/KismetMathLibrary.h"
#include "Particles/ParticleSystemComponent.h"
#include "Sound/SoundCue.h"
#include "ShooterProject/Character/BlasterCharacter.h"
#include "ShooterProject/BlasterComponent/LagCompensationComponent.h"
#include "ShooterProject/PlayerController/BlasterController.h"

void AShotgun::FireShotgun(const TArray<FVector_NetQuantize>& HitTargets)
{
	AWeapon::Fire(FVector());
	APawn* OwnerPawn = Cast<APawn>(GetOwner());
	if (OwnerPawn == nullptr) return;
	AController* InstigatorController = OwnerPawn->GetController();

	const USkeletalMeshSocket* MuzzleFlashSocket = GetWeaponMesh()->GetSocketByName("MuzzleFlash");
	if (MuzzleFlashSocket)
	{
		const FTransform SocketTransform = MuzzleFlashSocket->GetSocketTransform(GetWeaponMesh());
		const FVector Start = SocketTransform.GetLocation();

		// Maps hit character to the number of time hit
		TMap<ABlasterCharacter*, uint32> HitMap;
		for(FVector_NetQuantize HitTarget : HitTargets)
		{
			FHitResult FireHit;
			WeaponTraceHit(Start, HitTarget, FireHit);

			ABlasterCharacter* BlasterCharacter = Cast<ABlasterCharacter>(FireHit.GetActor());
			if (BlasterCharacter)
			{
				if (HitMap.Contains(BlasterCharacter))
				{
					HitMap[BlasterCharacter]++;
				}
				else
				{
					HitMap.Emplace(BlasterCharacter, 1);
				}
				if (ImpactParticles)
				{
					UGameplayStatics::SpawnEmitterAtLocation(
						GetWorld(),
						ImpactParticles,
						FireHit.ImpactPoint,
						FireHit.ImpactNormal.Rotation()
					);
				}
				if (HitSound)
				{
					UGameplayStatics::PlaySoundAtLocation(
						this,
						HitSound,
						FireHit.ImpactPoint,
						0.5f,
						FMath::RandRange(-0.5f,0.5f)
					);
				}
			}
		}
		TArray<ABlasterCharacter*> HitCharacters;
		for (auto HitPair : HitMap)
		{
			if (HitPair.Key && InstigatorController)
			{
				bool bCauseAuthDamage = !bUseServerSideRewind || OwnerPawn->IsLocallyControlled();
				if ( HasAuthority() && bCauseAuthDamage)
				{
					UGameplayStatics::ApplyDamage(
					HitPair.Key, // Character that was hit
					Damage * HitPair.Value, // Multiply damage with number of times hit
					InstigatorController,
					this,
					UDamageType::StaticClass()
					);
				}
				HitCharacters.Add(HitPair.Key);
			}
		}
		if (!HasAuthority() && bUseServerSideRewind)
		{
			BlasterOwnerCharacter = BlasterOwnerCharacter == nullptr ? Cast<ABlasterCharacter>(OwnerPawn) : BlasterOwnerCharacter;
			BlasterOwnerController = BlasterOwnerController == nullptr ? Cast<ABlasterController>(InstigatorController) : BlasterOwnerController;
			if (BlasterOwnerController && BlasterOwnerCharacter && BlasterOwnerCharacter->GetLagCompensation() && BlasterOwnerCharacter->IsLocallyControlled())
			{
				BlasterOwnerCharacter->GetLagCompensation()->ShotgunServerScoreRequest(
					HitCharacters,
					Start,
					HitTargets,
					BlasterOwnerController->GetServerTime() - BlasterOwnerController->SingleTripTime
				);
			}
		}
	}
}

void AShotgun::ShotgunTraceEndWithScatter(const FVector& HitTarget, TArray<FVector_NetQuantize>& HitTargets)
{
	const USkeletalMeshSocket* MuzzleFlashSocket = GetWeaponMesh()->GetSocketByName("MuzzleFlash");
	if (MuzzleFlashSocket == nullptr) return;

    const FTransform SocketTransform = MuzzleFlashSocket->GetSocketTransform(GetWeaponMesh());
	const FVector TraceStart = SocketTransform.GetLocation();

	const FVector ToTargetNormalized = (HitTarget - TraceStart).GetSafeNormal();
	const FVector SphereCenter = TraceStart + ToTargetNormalized * DistanceToSphere;

	for (int32 i = 0; i < NumberOfPallets; i++)
	{
		const FVector RandVec = UKismetMathLibrary::RandomUnitVector() * FMath::FRandRange(0.f, SphereRadius);
		const FVector EndLoc = SphereCenter + RandVec;
		FVector ToEndLoc = EndLoc - TraceStart;
		ToEndLoc = TraceStart + ToEndLoc * TRACE_LENGTH / ToEndLoc.Size();

		HitTargets.Add(ToEndLoc);
	}
}