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


#include "Enemy.h"

#include "Blueprint/UserWidget.h"
#include "Kismet/GameplayStatics.h"
#include "Sound/SoundCue.h"
#include "Particles/ParticleSystemComponent.h"
#include "Kismet/KismetMathLibrary.h"
#include "DrawDebugHelpers.h"
#include "EnemyController.h"
#include "BehaviorTree/BlackboardComponent.h"

// Sets default values
AEnemy::AEnemy() :
	Health(100.f),
	MaxHealth(100.f),
	HealthBarDisplayTime(4.f),
	HitReactTimeMin(.5f),
	HitReactTimeMax(1.f),
	bCanHitReact(true),
	HitNumberDestroyTime(1.5f)
{
 	// Set this character to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;
}

// Called when the game starts or when spawned
void AEnemy::BeginPlay()
{
	Super::BeginPlay();

	GetMesh()->SetCollisionResponseToChannel(ECollisionChannel::ECC_Visibility, ECollisionResponse::ECR_Block);

	// Get the AI Controller
	EnemyController = Cast<AEnemyController>(GetController());
	
	const FVector WorldPatrolPoint = UKismetMathLibrary::TransformLocation(GetActorTransform(), PatrolPoint);
	DrawDebugSphere(GetWorld(), WorldPatrolPoint, 25.f, 12, FColor::Red, true);

	if (EnemyController)
	{
		EnemyController->GetBlackboardComponent()->SetValueAsVector("PatrolPoint", WorldPatrolPoint);
		EnemyController->RunBehaviorTree(BehaviorTree);
	}
	
}

void AEnemy::ShowHealthBar_Implementation()
{
	GetWorldTimerManager().ClearTimer(HealthBarTimer);
	GetWorldTimerManager().SetTimer(HealthBarTimer, this, &AEnemy::HideHealthBar, HealthBarDisplayTime);
}

void AEnemy::Die()
{
	HideHealthBar();
}

void AEnemy::PlayHitMontage(FName Section, float PlayRate)
{
	if (!bCanHitReact) return;
	
	if (UAnimInstance* AnimInstance = GetMesh()->GetAnimInstance())
	{
		AnimInstance->Montage_Play(HitMontage, PlayRate);
		AnimInstance->Montage_JumpToSection(Section, HitMontage);
		
		bCanHitReact = false;
		const float HitReactTime{ FMath::FRandRange(HitReactTimeMin, HitReactTimeMax) };
		GetWorldTimerManager().SetTimer(HitReactTimer, this, &AEnemy::ResetHitReactTimer, HitReactTime);
	}
}

void AEnemy::ResetHitReactTimer()
{
	bCanHitReact = true;
}

void AEnemy::StoreHitNumber(UUserWidget* HitNumber, FVector Location)
{
	HitNumbers.Add(HitNumber, Location);

	FTimerHandle HitNumberTimer;
	FTimerDelegate HitNumberDelegate;
	HitNumberDelegate.BindUFunction(this, FName("DestroyHitNumber"), HitNumber);
	GetWorldTimerManager().SetTimer(HitNumberTimer, HitNumberDelegate, HitNumberDestroyTime, false);
}

void AEnemy::DestroyHitNumber(UUserWidget* HitNumber)
{
	HitNumbers.Remove(HitNumber);
	HitNumber->RemoveFromParent();
}

void AEnemy::UpdateHitNumbers()
{
	for (auto& HitPair : HitNumbers)
	{
		UUserWidget* HitNumber{ HitPair.Key };
		const FVector Location{ HitPair.Value };
		FVector2D ScreenPosition;
		UGameplayStatics::ProjectWorldToScreen(GetWorld()->GetFirstPlayerController(),
			Location, ScreenPosition);

		HitNumber->SetPositionInViewport(ScreenPosition);
	}
}

// Called every frame
void AEnemy::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);

	UpdateHitNumbers();
}

// Called to bind functionality to input
void AEnemy::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
	Super::SetupPlayerInputComponent(PlayerInputComponent);

}

void AEnemy::BulletHit_Implementation(FHitResult HitResult)
{
	if (ImpactSound)
	{
		UGameplayStatics::PlaySoundAtLocation(this, ImpactSound, GetActorLocation());
	}

	if (ImpactParticles)
	{
		UGameplayStatics::SpawnEmitterAtLocation(GetWorld(), ImpactParticles, HitResult.Location, FRotator(0.f), true);
	}
	
	ShowHealthBar();

	PlayHitMontage(FName("HitReactFront"));
}

float AEnemy::TakeDamage(float DamageAmount, FDamageEvent const& DamageEvent, AController* EventInstigator,
	AActor* DamageCauser)
{
	float DamageInflicted = DamageAmount;
	if (Health - DamageAmount <= 0.f)
	{
		DamageInflicted = Health; 
		Health = 0.f;
		Die();
	}
	else
	{
		Health -= DamageAmount;
	}
	return DamageInflicted;
}