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


#include "PartySubsystem.h"

#include "Kismet/GameplayStatics.h"

void UPartySubsystem::AddToParty(UUnitInfo* UnitInfo)
{
	for (FPartyMember &Unit : Members)
	{
		if(Unit.UnitInfo == UnitInfo)
		{
			const bool UpdateAllocated = GetMemberAvailable(Unit) == GetMemberAllocated(Unit);
			
			SetMemberAvailable(Unit, GetMemberAvailable(Unit) + 1);
			if (UpdateAllocated)
			{
				AllocateMember(Unit);
			}
			return;
		}
	}
}

TArray<FPartyMember> UPartySubsystem::GetMembers()
{
	return Members;
}

int32 UPartySubsystem::SpawnParty(const float InVerticalSpacing, const float InHorizontalOffset, const float InHorizontalSpacing, const int InNumRows)
{
	this->VerticalSpacing = InVerticalSpacing;
	this->HorizontalOffset = InHorizontalOffset;
	this->NumRows = InNumRows;
	this->HorizontalSpacing = InHorizontalSpacing;
	CurrentColumn = 0;
	SpawnQueue.Empty();

	TArray<AActor*> SpawnPoints;
	UGameplayStatics::GetAllActorsWithTag(GetWorld(), "PlayerSpawn", SpawnPoints);
	SpawnPoint = SpawnPoints[0];
	
	for (FPartyMember &Unit : GetMembers())
	{
		for(auto i = 0; i < GetMemberAllocated(Unit); i++)
		{
			SpawnQueue.Add(GetMemberUnitInfo(Unit)->GetCharacterClass());
		}
	}

	const int32 NumUnits = SpawnQueue.Num();
	
	SpawnUnits();
	GetWorld()->GetTimerManager().SetTimer(
		SpawnTimerHandle,
		this,
		&UPartySubsystem::SpawnUnits,
		0.5f,
		true);

	return NumUnits;
}

void UPartySubsystem::SpawnUnits()
{	
	for(auto i = 0; i < NumRows; i++)
	{
		if(i + LastSpawnIndex >= SpawnQueue.Num())
		{
			GetWorld()->GetTimerManager().ClearTimer(SpawnTimerHandle);
			LastSpawnIndex += i;
			return;
		}

		FActorSpawnParameters SpawnActorParameters = {};
		SpawnActorParameters.SpawnCollisionHandlingOverride = ESpawnActorCollisionHandlingMethod::AdjustIfPossibleButAlwaysSpawn;
		
		FVector Location = SpawnPoint->GetActorLocation() + FVector(i * -VerticalSpacing, -HorizontalOffset * CurrentColumn, 300);
		FRotator Rotation = FRotator(0, 90.0f, 0);
		
		AActor* NewActor = GetWorld()->SpawnActor(SpawnQueue[i + LastSpawnIndex], &Location, &Rotation, SpawnActorParameters);

		FHitResult Hit;
		FVector TraceStart = NewActor->GetActorLocation();
		FVector TraceEnd = -NewActor->GetActorUpVector() * 10000.0f;
		FCollisionQueryParams QueryParams;
		QueryParams.AddIgnoredActor(NewActor);

		NewActor->GetWorld()->LineTraceSingleByChannel(Hit, TraceStart, TraceEnd, ECC_WorldStatic, QueryParams);
		if(Hit.bBlockingHit)
		{
			NewActor->SetActorLocation(Hit.Location, true, nullptr, ETeleportType::ResetPhysics);
		}
	}

	LastSpawnIndex += NumRows;
	CurrentColumn++;
}

TArray<UUnitInfo*> UPartySubsystem::GetUnitsByTier(const int32 Tier) const
{
	TArray<UUnitInfo*> TierMembers;
	
	for(FPartyMember Member : Members)
	{
		if(GetMemberUnitInfo(Member)->GetTier() == Tier)
		{
			TierMembers.Add(GetMemberUnitInfo(Member));
		}
	}

	return TierMembers;
}

void UPartySubsystem::SetCredits(const int32 Amount)
{
	Credits = Amount;
}

bool UPartySubsystem::AllocateMember(FPartyMember& Member)
{
	Member.Allocated++;
	if(Member.Allocated > Member.Available)
	{
		Member.Allocated = Member.Available;
		return false;
	}

	return true;
}

bool UPartySubsystem::DeallocateMember(FPartyMember& Member)
{
	Member.Allocated--;

	if (Member.Allocated < 0)
	{
		Member.Allocated = 0;
		return false;
	}

	return true;
}

void UPartySubsystem::SetMemberMax(FPartyMember& Member)
{
	Member.Allocated = Member.Available;
}

void UPartySubsystem::ClearMember(FPartyMember& Member)
{
	Member.Allocated = 0;
}

int32 UPartySubsystem::GetMemberAllocated(FPartyMember& Member) const
{
	return Member.Allocated;
}

int32 UPartySubsystem::GetMemberAvailable(FPartyMember& Member) const
{
	return Member.Available;
}

void UPartySubsystem::SetMemberAvailable(FPartyMember& Member, int32 const Amount)
{
	Member.Available = Amount;
}

void UPartySubsystem::SetMemberUnitInfo(FPartyMember& Member, UUnitInfo* InUnitInfo)
{
	Member.UnitInfo = InUnitInfo;
}

UUnitInfo* UPartySubsystem::GetMemberUnitInfo(FPartyMember& Member) const
{
	return Member.UnitInfo;
}

int32 UPartySubsystem::GetTotalAvailablePartyMembers()
{
	int32 Total = 0;
	for(auto const Member : Members)
	{
		Total += Member.Available;
	}

	return Total;
}

int32 UPartySubsystem::GetTotalAllocatedPartyMembers()
{
	int32 Total = 0;
	for(auto const Member : Members)
	{
		Total += Member.Allocated;
	}

	return Total;
}