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


#include "AdventureCameraPawn.h"

#include "AdventureMap.h"
#include "AdventurePlayerController.h"
#include "AdventureCharacter.h"

#include "GameFramework/PlayerController.h"
#include "Kismet/GameplayStatics.h"

#include "math.h"

// Sets default values
AAdventureCameraPawn::AAdventureCameraPawn()
{
 	// Set this pawn to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;

	ESASize = .01;
	BaseScrollSpeed = 15;
	ScrollAccelleration = BaseScrollSpeed * 2;

	ESAMaxBoundSlope = 1 / (1 - (1-ESASize));
	ESAMaxBoundIntercept = 1 - ESAMaxBoundSlope;

	ESAMinBoundSlope = -1 / ESASize;
	ESAMinBoundIntercept = 0 - (ESAMinBoundSlope * ESASize);

}

// Called when the game starts or when spawned
void AAdventureCameraPawn::BeginPlay()
{
	Super::BeginPlay();
	ControllerRef = (AAdventurePlayerController*)UGameplayStatics::GetPlayerController(GetWorld(), 0);

	Viewport = GetWorld()->GetGameViewport();
	ViewSize = Viewport->Viewport->GetSizeXY();

}

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

}

// Called to bind functionality to input
void AAdventureCameraPawn::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
	Super::SetupPlayerInputComponent(PlayerInputComponent);
	if (PlayerInputComponent)
	{
		PlayerInputComponent->BindAxis("Mouse X", this, &AAdventureCameraPawn::EdgeScrollSide);
		PlayerInputComponent->BindAxis("Mouse Y", this, &AAdventureCameraPawn::EdgeScrollVert);
	}
}


void AAdventureCameraPawn::EdgeScrollSide(float AxisValue)
{
	float mouseX;
	float mouseY;
	ControllerRef->GetMousePosition(mouseX, mouseY);
	float mousePosX = mouseX / ViewSize.X;
	float VertAccelleration = GetInputAxisValue("Mouse Y") * (ScrollAccelleration * .75);

	if (mousePosX <= ESASize) // if in LEFT area
	{
		////// Scroll LEFT with Vert Accelleration
		float SpeedX = (mousePosX * ESAMinBoundSlope + ESAMinBoundIntercept) * BaseScrollSpeed;
		AddActorLocalOffset(FVector(VertAccelleration, -SpeedX, 0));

		if (AxisValue < .0 && mousePosX <= .005) // if mouse moving LEFT and touching EDGE
		{
			////// Add LEFT accelleration
			SpeedX = AxisValue * ScrollAccelleration;
			AddActorLocalOffset(FVector(0, SpeedX, 0));
		}
	}

	if (mousePosX >= 1-ESASize) // if in RIGHT area
	{
		////// Scroll RIGHT
		float SpeedX = (mousePosX * ESAMaxBoundSlope + ESAMaxBoundIntercept) * BaseScrollSpeed;
		AddActorLocalOffset(FVector(VertAccelleration, SpeedX, 0));

		if (AxisValue > .0 && mousePosX >= .995) // if mouse moving RIGHT and touching EDGE
		{
			////// Add RIGHT accelleration
			SpeedX = AxisValue * ScrollAccelleration;
			AddActorLocalOffset(FVector(0, SpeedX, 0));
		}
	}
}

void AAdventureCameraPawn::EdgeScrollVert(float AxisValue)
{
	float mouseX;
	float mouseY;
	ControllerRef->GetMousePosition(mouseX, mouseY);
	float mousePosY = mouseY / ViewSize.Y;
	float SideAccelleration = GetInputAxisValue("Mouse X") * (ScrollAccelleration * .75);

	if (mousePosY <= ESASize) // if in TOP area
	{
		////// Scroll TOP
		float SpeedY = (mousePosY * ESAMinBoundSlope + ESAMinBoundIntercept) * BaseScrollSpeed;
		AddActorLocalOffset(FVector(SpeedY, SideAccelleration, 0));

		if (AxisValue > .0 && mousePosY <= .005) // if mouse moving TOP and touching EDGE
		{
			////// Add TOP accelleration
			SpeedY = AxisValue * ScrollAccelleration;
			AddActorLocalOffset(FVector(SpeedY, 0, 0));
		}
	}

	if (mousePosY >= 1-ESASize) // if in BOTTOM area
	{
		////// Scroll BOTTOM
		float SpeedY = (mousePosY * ESAMaxBoundSlope + ESAMaxBoundIntercept) * BaseScrollSpeed;
		AddActorLocalOffset(FVector(-SpeedY, SideAccelleration, 0));

		if (AxisValue < .0 && mousePosY >= .995) // if mouse moving BOTTOM and touching EDGE
		{
			////// add BOTTOM accelleration
			SpeedY = AxisValue * ScrollAccelleration;
			AddActorLocalOffset(FVector(SpeedY, 0, 0));
		}

	}
}

void AAdventureCameraPawn::FollowAdvPawn()
{
	UE_LOG(LogTemp, Warning, TEXT("following..."));

	AdvPawnLocationCurrent = AdvPawnRef->GetActorLocation();
	AdvPawnLocationDelta = AdvPawnLocationCurrent - AdvPawnLocationPrevious;

	UE_LOG(LogTemp, Warning, TEXT("%s"), *AdvPawnLocationDelta.ToString());

	AddActorLocalOffset(AdvPawnLocationDelta);

	AdvPawnLocationPrevious = AdvPawnLocationCurrent;
}