Yamato/Source/MyProject3/EnemyProjectile.cpp

#include "EnemyProjectile.h"
#include "GameFramework/ProjectileMovementComponent.h"
#include "Components/StaticMeshComponent.h"
#include "SpaceshipPawn.h"  // Include the player ship header
#include "Kismet/GameplayStatics.h"
#include "Engine/Engine.h"

AEnemyProjectile::AEnemyProjectile()
{
    PrimaryActorTick.bCanEverTick = true;

    // Create and setup the projectile mesh
    ProjectileMesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("ProjectileMesh"));
    RootComponent = ProjectileMesh;
    ProjectileMesh->SetCollisionProfileName(TEXT("EnemyProjectile"));

    // Set up collision
    ProjectileMesh->SetCollisionEnabled(ECollisionEnabled::QueryAndPhysics);
    ProjectileMesh->SetCollisionObjectType(ECC_WorldDynamic);
    ProjectileMesh->SetCollisionResponseToAllChannels(ECR_Ignore);

    // Block GameTraceChannel1 (player ship)
    ProjectileMesh->SetCollisionResponseToChannel(ECC_GameTraceChannel1, ECR_Block);

    // Block world static for environment collisions
    ProjectileMesh->SetCollisionResponseToChannel(ECC_WorldStatic, ECR_Block);

    // Block pawns for player ship collision
    ProjectileMesh->SetCollisionResponseToChannel(ECC_Pawn, ECR_Block);

    // Enable overlap events
    ProjectileMesh->SetGenerateOverlapEvents(true);

    // Bind hit event
    ProjectileMesh->OnComponentHit.AddDynamic(this, &AEnemyProjectile::OnHit);

    // Bind overlap event for redundant collision detection
    ProjectileMesh->OnComponentBeginOverlap.AddDynamic(this, &AEnemyProjectile::OnOverlapBegin);

    // Create and setup projectile movement
    ProjectileMovement = CreateDefaultSubobject<UProjectileMovementComponent>(TEXT("ProjectileMovement"));
    ProjectileMovement->UpdatedComponent = ProjectileMesh;
    ProjectileMovement->InitialSpeed = ProjectileSpeed;
    ProjectileMovement->MaxSpeed = ProjectileSpeed;
    ProjectileMovement->bRotationFollowsVelocity = true;
    ProjectileMovement->ProjectileGravityScale = 0.0f;

    // Important: Enable sweep to prevent tunneling at high speeds
    ProjectileMovement->bSweepCollision = true;

    // Set lifetime
    InitialLifeSpan = 3.0f;
}

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

    // Debug message to verify projectile spawned
    if (GEngine)
    {
        GEngine->AddOnScreenDebugMessage(-1, 1.0f, FColor::Blue, TEXT("Enemy Projectile Spawned"));
    }
}

void AEnemyProjectile::OnHit(UPrimitiveComponent* HitComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
    FVector NormalImpulse, const FHitResult& Hit)
{
    // Debug message to verify hit detection
    if (GEngine && OtherActor)
    {
        GEngine->AddOnScreenDebugMessage(-1, 2.0f, FColor::Orange,
            FString::Printf(TEXT("Enemy Projectile hit: %s"), *OtherActor->GetName()));
    }

    if (OtherActor && OtherActor != this)
    {
        // Check if we hit a player ship
        ASpaceshipPawn* Player = Cast<ASpaceshipPawn>(OtherActor);
        if (Player)
        {
            // Apply damage to player
            FDamageEvent DamageEvent;
            float ActualDamage = Player->TakeDamage(DamageAmount, DamageEvent, nullptr, this);

            // Debug message for damage
            if (GEngine)
            {
                GEngine->AddOnScreenDebugMessage(-1, 2.0f, FColor::Red,
                    FString::Printf(TEXT("Dealt %.1f damage to player"), ActualDamage));
            }

            // Spawn impact effect if set
            if (ImpactEffect)
            {
                UGameplayStatics::SpawnEmitterAtLocation(
                    GetWorld(),
                    ImpactEffect,
                    Hit.Location,
                    Hit.Normal.Rotation()
                );
            }
        }
    }

    // Destroy the projectile
    Destroy();
}

void AEnemyProjectile::OnOverlapBegin(UPrimitiveComponent* OverlappedComp, AActor* OtherActor,
    UPrimitiveComponent* OtherComp, int32 OtherBodyIndex,
    bool bFromSweep, const FHitResult& SweepResult)
{
    // This is a redundant collision detection method
    // Some fast-moving projectiles might miss hit events but catch overlap events

    // Debug message to verify overlap detection
    if (GEngine && OtherActor)
    {
        GEngine->AddOnScreenDebugMessage(-1, 2.0f, FColor::Yellow,
            FString::Printf(TEXT("Enemy Projectile overlap with: %s"), *OtherActor->GetName()));
    }

    if (OtherActor && OtherActor != this)
    {
        // Check if we overlap with a player ship
        ASpaceshipPawn* Player = Cast<ASpaceshipPawn>(OtherActor);
        if (Player)
        {
            // Apply damage to player
            FDamageEvent DamageEvent;
            float ActualDamage = Player->TakeDamage(DamageAmount, DamageEvent, nullptr, this);

            // Debug message for damage
            if (GEngine)
            {
                GEngine->AddOnScreenDebugMessage(-1, 2.0f, FColor::Red,
                    FString::Printf(TEXT("Overlap - Dealt %.1f damage to player"), ActualDamage));
            }

            // Spawn impact effect if set
            if (ImpactEffect)
            {
                UGameplayStatics::SpawnEmitterAtLocation(
                    GetWorld(),
                    ImpactEffect,
                    GetActorLocation(),
                    GetActorRotation()
                );
            }

            // Destroy the projectile
            Destroy();
        }
    }
}