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


#include "Unit.h"

#include "SPGameState.h"
#include "StatsSubsystem.h"
#include "Components/CapsuleComponent.h"
#include "GameFramework/CharacterMovementComponent.h"
#include "GameFramework/GameModeBase.h"
#include "Kismet/GameplayStatics.h"

class ASPGameState;
// Sets default values
AUnit::AUnit()
{
 	// 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;
	AutoPossessAI = EAutoPossessAI::PlacedInWorldOrSpawned;

	ProjectileSpawnPoint = CreateDefaultSubobject<UArrowComponent>(TEXT("Projectile Spawn Point"));
	ProjectileSpawnPoint->SetupAttachment(RootComponent);
	
	DamageNumberWidget = CreateDefaultSubobject<UWidgetComponent>(TEXT("Damage Number Widget"));
	DamageNumberWidget->SetWidgetSpace(EWidgetSpace::Screen);
	DamageNumberWidget->SetVisibility(false, true);
	DamageNumberWidget->SetupAttachment(RootComponent);
	
	FString MeleeAttack1Name = "/Game/TopDown/Blueprints/Characters/Main/M_Melee.M_Melee";
	UAnimMontage* MontageMelee1 = Cast<UAnimMontage>(StaticLoadObject(UAnimMontage::StaticClass(), nullptr, *MeleeAttack1Name));
	FString MeleeAttack2Name = "/Game/TopDown/Blueprints/Characters/Main/M_Melee2.M_Melee2";
	UAnimMontage* MontageMelee2 = Cast<UAnimMontage>(StaticLoadObject(UAnimMontage::StaticClass(), nullptr, *MeleeAttack2Name));

	MeleeMontage.Add(MontageMelee1);
	MeleeMontage.Add(MontageMelee2);
	
	GetCharacterMovement()->SetWalkableFloorAngle(80);
	GetCharacterMovement()->MaxStepHeight = 100;
}

// Called when the game starts or when spawned
void AUnit::BeginPlay()
{
	Super::BeginPlay();
	DamageNumbersOriginalPosition = DamageNumberWidget->GetRelativeLocation();
}

void AUnit::OnDeath_Implementation()
{
	GetCharacterMovement()->SetMovementMode(MOVE_None);
	GetCapsuleComponent()->SetCollisionEnabled(ECollisionEnabled::NoCollision);
	GetCharacterMovement()->SetComponentTickEnabled(false);
	SetActorTickEnabled(false);
	GetMesh()->SetCollisionEnabled(ECollisionEnabled::PhysicsOnly);
	GetMesh()->SetSimulatePhysics(true);
	
	if(ActorHasTag("Enemy"))
	{
		TObjectPtr<UStatsSubsystem> GameInstance = GetGameInstance()->GetSubsystem<UStatsSubsystem>();
		GameInstance->XP += XP;
		GameInstance->Money += Money;

		GetMesh()->SetCollisionResponseToChannel(ECC_EngineTraceChannel1, ECR_Ignore);
		GetCapsuleComponent()->SetCollisionResponseToChannel(ECC_EngineTraceChannel1, ECR_Ignore);
		GetWorld()->GetAuthGameMode()->GetGameState<ASPGameState>()->DecrementEnemies();
	}
}

// Called every frame
void AUnit::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);
	CooldownTimer += DeltaTime;
	if(IsDead())
	{
		OnDeath();
	}
}

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

void AUnit::ApplyMeleeDamage()
{
	if(TargetUnit != nullptr)
	{
		UGameplayStatics::ApplyDamage(TargetUnit, Attack, GetController(), this, nullptr);
	} else
	{
		UE_LOG(LogTemp, Warning, TEXT("Attempt to call Apply Melee Damage with no TargetUnit set"));
	}
}

void AUnit::LaunchProjectileSignal()
{
	if(TargetUnit && ProjectileClasses.Num() >= 1)
	{
		TSubclassOf<ABasicProjectile> P = ProjectileClasses[FMath::RandRange(0, ProjectileClasses.Num() - 1)];
		FVector SpawnPoint = ProjectileSpawnPoint->GetComponentLocation();
		FRotator ActorRotation = GetActorRotation();
		FActorSpawnParameters SpawnOptions;
		SpawnOptions.SpawnCollisionHandlingOverride = ESpawnActorCollisionHandlingMethod::AlwaysSpawn;
		ABasicProjectile* NewProjectile = GetWorld()->SpawnActor<ABasicProjectile>(P, SpawnPoint, ActorRotation, SpawnOptions);
		ABasicProjectile* AsProjectile = Cast<ABasicProjectile>(NewProjectile);
		NewProjectile->SetLifeSpan(5.0f);
		AsProjectile->Damage = Attack;
		if(ActorHasTag("Enemy"))
		{
			AsProjectile->SphereComponent->SetCollisionProfileName("EnemyProjectile");
		} else
		{
			AsProjectile->SphereComponent->SetCollisionProfileName("PlayerProjectile");
		}
		AsProjectile->SphereComponent->SetCollisionEnabled(ECollisionEnabled::QueryOnly);
		
		UProjectileMovementComponent* ProjectileMovement = NewProjectile->GetComponentByClass<UProjectileMovementComponent>();
		FVector UnitDirection =  TargetUnit->GetActorLocation() - GetActorLocation();
		UnitDirection.Normalize();
		ProjectileMovement->Velocity = (UnitDirection * ProjectileSpeed);
	}
}

void AUnit::SetTarget(AUnit* InTarget)
{
	TargetUnit = InTarget;
}

AUnit* AUnit::FindNearestEnemy()
{
	const bool IsEnemy = ActorHasTag("Enemy");
	const FName TagToSearch = IsEnemy ? "Player" : "Enemy";
	
	TArray<AActor*> FoundActors;
	UGameplayStatics::GetAllActorsWithTag(GetWorld(), TagToSearch, FoundActors);

	AActor* NearestActor = nullptr;
	float NearestDistance = MAX_FLT;

	for(AActor* CurrentActor : FoundActors)
	{
		if(Cast<AUnit>(CurrentActor)->IsDead())
		{
			continue;
		}
		
		const float Distance = FVector::DistSquared(CurrentActor->GetActorLocation(), GetActorLocation());
		if(Distance < NearestDistance)
		{
			NearestActor = CurrentActor;
			NearestDistance = Distance;
		}
	}

	auto NewTarget = Cast<AUnit>(NearestActor);
	TargetUnit = NewTarget;
	return NewTarget;
}

float AUnit::TakeDamage(float DamageAmount, FDamageEvent const& DamageEvent, AController* EventInstigator,
                        AActor* DamageCauser)
{
	FVector HitFromDirection = GetActorLocation() - DamageCauser->GetActorLocation();
	HitFromDirection.Z = 0;
	HitFromDirection.Normalize();
	
	const float ActualDamage = DamageAmount * (1 - Defense / (Defense + 5.0f)) + 1;
	HP -= FMath::RoundToInt(ActualDamage);
	HP = FMath::Max(0, HP);
	DamageNumberValue = FMath::RoundToInt(ActualDamage);
	LaunchCharacter(HitFromDirection * 200.0f, true, false);
	Super::TakeDamage(DamageAmount, DamageEvent, EventInstigator, DamageCauser);
	return FMath::RoundToInt(ActualDamage);
}

bool AUnit::IsDead() const
{
	return HP <= 0;
}

void AUnit::HideDamageNumbers() const
{
	DamageNumberWidget->SetVisibility(false, true);
}