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

#include "SpawnerProject.h"
#include "Spawner.h"

// Sets default values
ASpawner::ASpawner()
{
    // Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
    PrimaryActorTick.bCanEverTick = false;
    sceneComponent = CreateDefaultSubobject<USceneComponent>(TEXT("RootComponent"));
    RootComponent = sceneComponent;
    OurRoot = sceneComponent;

    boxComponent = CreateDefaultSubobject<UBoxComponent>(TEXT("Box Collider"));

    boxComponent->InitBoxExtent(boxExtent);
    boxComponent->AttachTo(RootComponent);

}

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

    for (int i = 0; i < spawnAmount; i++) {
        FActorSpawnParameters spawnParams;                      //create spawn params
        spawnParams.Owner = this;                               //who did the spawn? THIS controller did it
        spawnParams.Instigator = Instigator;                    //instigator to default
        spawnLoc = this->GetActorLocation();                    //get actor location
        RandomSpawnNVelocity();                                 //spawn random position of box extent & velocity
        ourNewObject = GetWorld()->SpawnActor<AActor>(ourSpawnObject, objectLocation, FRotator::ZeroRotator, spawnParams);   //spawn actor
        UStaticMeshComponent* SM = Cast<UStaticMeshComponent>(ourNewObject->GetRootComponent());
        if (SM && firework)
        {
            SM->AddImpulse(objectVelocity*SM->GetMass());
        }

        ourNewObject->SetLifeSpan(FMath::RandRange(objectLifeTimeMin, objectLifeTimeMax));                      // set life span
        GetWorld()->GetTimerManager().SetTimer(timerHandle, this, &ASpawner::SpawnDespawn, spawnRate, true);   //spawn rate of object spawn
        //could get better frames if disable active of object and renable back
    }
}

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

/*
    Spawn and Despawn object
*/
void ASpawner::SpawnDespawn()
{
    for (int i = 0; i < spawnAmount; i++) {

        FActorSpawnParameters spawnParams;                      //create spawn params
        spawnParams.Owner = this;                               //who did the spawn? THIS controller did it
        spawnParams.Instigator = Instigator;                    //instigator to default
        spawnLoc = this->GetActorLocation();                    //get actor location
        RandomSpawnNVelocity();
        ourNewObject = GetWorld()->SpawnActor<AActor>(ourSpawnObject, objectLocation, FRotator::ZeroRotator, spawnParams);
        UStaticMeshComponent* SM = Cast<UStaticMeshComponent>(ourNewObject->GetRootComponent());

        if (SM && firework)
        {
            SM->AddImpulse(objectVelocity*SM->GetMass());
        }

        ourNewObject->SetLifeSpan(FMath::RandRange(objectLifeTimeMin, objectLifeTimeMax));
    }
}

/*
    Get Random position within box extent & Simulate firework physics
*/
void ASpawner::RandomSpawnNVelocity()
{
    float x = boxExtent.X;
    float y = boxExtent.Y;
    float z = boxExtent.Z;
    x = FMath::RandRange(spawnLoc.X - x, spawnLoc.X + x);
    y = FMath::RandRange(spawnLoc.Y - y, spawnLoc.Y + y);
    z = FMath::RandRange(spawnLoc.Z - z, spawnLoc.Z + z);

    if (!firework) {
        objectLocation = FVector(x, y, z);
    }
    else {
        objectLocation = FVector(x, y, boxExtent.Z);
        objectVelocity = FVector(FMath::RandRange(-200.0f, 200.0f), FMath::RandRange(-200.0f, 200.0f), FMath::RandRange(minLaunchVelocity, maxLaunchVelocity));
    }
}