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


#include "SPGameState.h"

#include "AIController.h"
#include "RosterSubsystem.h"
#include "StatsSubsystem.h"
#include "GameFramework/Character.h"
#include "Kismet/GameplayStatics.h"

void ASPGameState::BeginPlay()
{
	UGameplayStatics::GetPlayerCameraManager(GetWorld(),0)->SetManualCameraFade(1.0, FLinearColor::Black, false);
	GetWorld()->GetTimerManager().SetTimer(
		FadeHandle,
		this,
		&ASPGameState::FadeCamera,
		0.5f);

	UStatsSubsystem* StatsSystem = GetGameInstance()->GetSubsystem<UStatsSubsystem>();
	if (StatsSystem->CurrentWave == 1)
	{
		StatsSystem->CurrentHP = StatsSystem->MaxHP;
	}
}

void ASPGameState::Tick(float DeltaSeconds)
{
	if(AliveEnemies != -1)
	{
		if (AliveEnemies == 0 || Cast<AUnit>(PlayerCharacter)->IsDead())
		{
			ISaveable::Execute_SaveGame(Saveable);
			AliveEnemies = -1;
            PrimaryActorTick.bCanEverTick = false;
			UStatsSubsystem* StatsSystem = GetGameInstance()->GetSubsystem<UStatsSubsystem>();
			NextLevelName = "BattleMap";
			
			// All enemies dead
			if(!Cast<AUnit>(PlayerCharacter)->IsDead())
			{
				StatsSystem->HighestWave = FMath::Max(StatsSystem->CurrentWave, StatsSystem->HighestWave);
				StatsSystem->CurrentWave++;
				StatsSystem->CurrentHP = Cast<AUnit>(PlayerCharacter)->HP;
			} else
			{
				StatsSystem->CurrentWave = 1;
			}
			
			FTimerHandle RunupHandle;
			GetWorld()->GetTimerManager().SetTimer(
				RunupHandle,
				this,
				&ASPGameState::TransitionLevel,
				2.0f);
		}
	}
}


ASPGameState::ASPGameState()
{
	PrimaryActorTick.bCanEverTick = true;
}

void ASPGameState::StartLevel(FLevelSetup InLevelSetup)
{
	LevelSetup = InLevelSetup;
	UWorld* World = GetWorld();
	if(!World)
	{
		UE_LOG(LogTemp, Error, TEXT("StartLevel was unable to get a handle via GetWorld"));
		return;
	}
	
	ISaveable::Execute_SaveGame(Saveable);
	PlayerCharacter = World->SpawnActor<ACharacter>(LevelSetup.PlayerCharacterClass, LevelSetup.PlayerSpawnPoint, FRotator::ZeroRotator);
	UStatsSubsystem* StatsSystem = GetGameInstance()->GetSubsystem<UStatsSubsystem>();
	AUnit* PCUnit = Cast<AUnit>(PlayerCharacter);
	PCUnit->MaxHP = StatsSystem->MaxHP;
	StatsSystem->CurrentHP += StatsSystem->RecoveryPerTurn;
	StatsSystem->CurrentHP = FMath::Min(StatsSystem->CurrentHP, StatsSystem->MaxHP);
	PCUnit->HP = StatsSystem->CurrentHP;
	PCUnit->Attack = StatsSystem->AttackPower;
	PCUnit->Defense = StatsSystem->DefensePower;
	PCUnit->Cooldown = 1 / StatsSystem->AttackSpeed;
	PCUnit->CooldownTimer = PCUnit->Cooldown;
	PCUnit->Dexterity = StatsSystem->Dexterity;
	PCUnit->ApplyStats();
	
	Cast<AAIController>(PCUnit->GetController())->MoveToLocation(LevelSetup.RunupPoint);
	
	FTimerHandle RunupHandle;
	World->GetTimerManager().SetTimer(
		RunupHandle,
		this,
		&ASPGameState::SpawnEnemies,
		2.0f);
}

void ASPGameState::DecrementEnemies()
{
	AliveEnemies--;
}

void ASPGameState::TransitionLevel()
{
	UGameplayStatics::GetPlayerCameraManager(GetWorld(), 0)->StartCameraFade(0, 1.0f, .5f, FLinearColor::Black, false, true);
	GetWorld()->GetTimerManager().SetTimer(
		FadeHandle,
		this,
		&ASPGameState::LoadNextLevel,
		1);
}

void ASPGameState::SpawnEnemies()
{
	int32 TotalEnemies = 0;
	UWorld* World = GetWorld();
	URosterSubsystem* RosterSubsystem = GetGameInstance()->GetSubsystem<URosterSubsystem>();
	int32 CurrentWave = GetGameInstance()->GetSubsystem<UStatsSubsystem>()->CurrentWave;
	int32 TargetChallenge = FMath::FloorToInt(CurrentWave * 1.25f);
 
	while(TargetChallenge > 0)
	{
		const URosterEntry* NewEnemy = RosterSubsystem->GetEnemy(TargetChallenge);
		FVector SpawnPoint = LevelSetup.EnemySpawnPoints[FMath::RandRange(0, LevelSetup.EnemySpawnPoints.Num() -1)];
		FActorSpawnParameters SpawnParams;
		SpawnParams.SpawnCollisionHandlingOverride = ESpawnActorCollisionHandlingMethod::AdjustIfPossibleButAlwaysSpawn;
		AActor* NewActor = World->SpawnActor<ACharacter>(NewEnemy->EnemyUnit.Get(), SpawnPoint, FRotator::ZeroRotator, SpawnParams);
		NewActor->Tags.Add("Enemy");
		TargetChallenge -= NewEnemy->DifficultyRating;
		TotalEnemies++;
	}
	
	AliveEnemies = TotalEnemies;
}

void ASPGameState::FadeCamera()
{
	UGameplayStatics::GetPlayerCameraManager(GetWorld(), 0)->StartCameraFade(1.0f, 0, .5f, FLinearColor::Black);
}

void ASPGameState::LoadNextLevel()
{
	UGameplayStatics::OpenLevel(GetWorld(), NextLevelName);
}