// Copyright 1998-2015 Epic Games, Inc. All Rights Reserved.

#include "ItemSample.h"
#include "ItemSampleCharacter.h"
#include "ItemSampleProjectile.h"
#include "Animation/AnimInstance.h"
#include "UsableItem.h"
#include "GameFramework/InputSettings.h"

DEFINE_LOG_CATEGORY_STATIC(LogFPChar, Warning, All);

//////////////////////////////////////////////////////////////////////////
// AItemSampleCharacter

AItemSampleCharacter::AItemSampleCharacter()
{
	// Set size for collision capsule
	GetCapsuleComponent()->InitCapsuleSize(42.f, 96.0f);

	// set our turn rates for input
	BaseTurnRate = 45.f;
	BaseLookUpRate = 45.f;

	// Create a CameraComponent	
	FirstPersonCameraComponent = CreateDefaultSubobject<UCameraComponent>(TEXT("FirstPersonCamera"));
	FirstPersonCameraComponent->AttachParent = GetCapsuleComponent();
	FirstPersonCameraComponent->RelativeLocation = FVector(0, 0, 64.f); // Position the camera
	FirstPersonCameraComponent->bUsePawnControlRotation = true;

	// Default offset from the character location for projectiles to spawn
	GunOffset = FVector(100.0f, 30.0f, 10.0f);

	// Create a mesh component that will be used when being viewed from a '1st person' view (when controlling this pawn)
	Mesh1P = CreateDefaultSubobject<USkeletalMeshComponent>(TEXT("CharacterMesh1P"));
	Mesh1P->SetOnlyOwnerSee(true);			// only the owning player will see this mesh
	Mesh1P->AttachParent = FirstPersonCameraComponent;
	Mesh1P->RelativeLocation = FVector(0.f, 0.f, -150.f);
	Mesh1P->bCastDynamicShadow = false;
	Mesh1P->CastShadow = false;

	//Included in 4.7, needs to be added in 4.8
	PrimaryActorTick.bCanEverTick = true;

	// Note: The ProjectileClass and the skeletal mesh/anim blueprints for Mesh1P are set in the
	// derived blueprint asset named MyCharacter (to avoid direct content references in C++)
}

// Called every frame -- Included in 4.7, needs to be added in 4.8
void AItemSampleCharacter::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);

	AUsableItem* itemSeen = GetItemFocus();
	static AUsableItem* oldFocus = NULL;

	oldFocus = ApplyPostProcessing(itemSeen, oldFocus);

}

//////////////////////////////////////////////////////////////////////////
// Input

void AItemSampleCharacter::SetupPlayerInputComponent(class UInputComponent* InputComponent)
{
	// set up gameplay key bindings
	check(InputComponent);

	InputComponent->BindAction("Jump", IE_Pressed, this, &ACharacter::Jump);
	InputComponent->BindAction("Jump", IE_Released, this, &ACharacter::StopJumping);

	InputComponent->BindAction("Take", IE_Pressed, this, &AItemSampleCharacter::Use);
	
	//InputComponent->BindTouch(EInputEvent::IE_Pressed, this, &AItemSampleCharacter::TouchStarted);
	if( EnableTouchscreenMovement(InputComponent) == false )
	{
		InputComponent->BindAction("Fire", IE_Pressed, this, &AItemSampleCharacter::OnFire);
	}
	
	InputComponent->BindAxis("MoveForward", this, &AItemSampleCharacter::MoveForward);
	InputComponent->BindAxis("MoveRight", this, &AItemSampleCharacter::MoveRight);
	
	// We have 2 versions of the rotation bindings to handle different kinds of devices differently
	// "turn" handles devices that provide an absolute delta, such as a mouse.
	// "turnrate" is for devices that we choose to treat as a rate of change, such as an analog joystick
	InputComponent->BindAxis("Turn", this, &APawn::AddControllerYawInput);
	InputComponent->BindAxis("TurnRate", this, &AItemSampleCharacter::TurnAtRate);
	InputComponent->BindAxis("LookUp", this, &APawn::AddControllerPitchInput);
	InputComponent->BindAxis("LookUpRate", this, &AItemSampleCharacter::LookUpAtRate);
}

void AItemSampleCharacter::Use(){
	if (GetItemFocus()){
		GetItemFocus()->GetStaticMeshComponent()->DestroyComponent();
	}

}

void AItemSampleCharacter::OnFire()
{ 
	// try and fire a projectile
	if (ProjectileClass != NULL)
	{
		const FRotator SpawnRotation = GetControlRotation();
		// MuzzleOffset is in camera space, so transform it to world space before offsetting from the character location to find the final muzzle position
		const FVector SpawnLocation = GetActorLocation() + SpawnRotation.RotateVector(GunOffset);

		UWorld* const World = GetWorld();
		if (World != NULL)
		{
			// spawn the projectile at the muzzle
			World->SpawnActor<AItemSampleProjectile>(ProjectileClass, SpawnLocation, SpawnRotation);
		}
	}

	// try and play the sound if specified
	if (FireSound != NULL)
	{
		UGameplayStatics::PlaySoundAtLocation(this, FireSound, GetActorLocation());
	}

	// try and play a firing animation if specified
	if(FireAnimation != NULL)
	{
		// Get the animation object for the arms mesh
		UAnimInstance* AnimInstance = Mesh1P->GetAnimInstance();
		if(AnimInstance != NULL)
		{
			AnimInstance->Montage_Play(FireAnimation, 1.f);
		}
	}

}

void AItemSampleCharacter::BeginTouch(const ETouchIndex::Type FingerIndex, const FVector Location)
{
	if( TouchItem.bIsPressed == true )
	{
		return;
	}
	TouchItem.bIsPressed = true;
	TouchItem.FingerIndex = FingerIndex;
	TouchItem.Location = Location;
	TouchItem.bMoved = false;
}

void AItemSampleCharacter::EndTouch(const ETouchIndex::Type FingerIndex, const FVector Location)
{
	if (TouchItem.bIsPressed == false)
	{
		return;
	}
	if( ( FingerIndex == TouchItem.FingerIndex ) && (TouchItem.bMoved == false) )
	{
		OnFire();
	}
	TouchItem.bIsPressed = false;
}

void AItemSampleCharacter::TouchUpdate(const ETouchIndex::Type FingerIndex, const FVector Location)
{
	if ((TouchItem.bIsPressed == true) && ( TouchItem.FingerIndex==FingerIndex))
	{
		if (TouchItem.bIsPressed)
		{
			if (GetWorld() != nullptr)
			{
				UGameViewportClient* ViewportClient = GetWorld()->GetGameViewport();
				if (ViewportClient != nullptr)
				{
					FVector MoveDelta = Location - TouchItem.Location;
					FVector2D ScreenSize;
					ViewportClient->GetViewportSize(ScreenSize);
					FVector2D ScaledDelta = FVector2D( MoveDelta.X, MoveDelta.Y) / ScreenSize;									
					if (ScaledDelta.X != 0.0f)
					{
						TouchItem.bMoved = true;
						float Value = ScaledDelta.X * BaseTurnRate;
						AddControllerYawInput(Value);
					}
					if (ScaledDelta.Y != 0.0f)
					{
						TouchItem.bMoved = true;
						float Value = ScaledDelta.Y* BaseTurnRate;
						AddControllerPitchInput(Value);
					}
					TouchItem.Location = Location;
				}
				TouchItem.Location = Location;
			}
		}
	}
}

void AItemSampleCharacter::MoveForward(float Value)
{
	if (Value != 0.0f)
	{
		// add movement in that direction
		AddMovementInput(GetActorForwardVector(), Value);
	}
}

void AItemSampleCharacter::MoveRight(float Value)
{
	if (Value != 0.0f)
	{
		// add movement in that direction
		AddMovementInput(GetActorRightVector(), Value);
	}
}

void AItemSampleCharacter::TurnAtRate(float Rate)
{
	// calculate delta for this frame from the rate information
	AddControllerYawInput(Rate * BaseTurnRate * GetWorld()->GetDeltaSeconds());
}

void AItemSampleCharacter::LookUpAtRate(float Rate)
{
	// calculate delta for this frame from the rate information
	AddControllerPitchInput(Rate * BaseLookUpRate * GetWorld()->GetDeltaSeconds());
}

bool AItemSampleCharacter::EnableTouchscreenMovement(class UInputComponent* InputComponent)
{
	bool bResult = false;
	if(FPlatformMisc::GetUseVirtualJoysticks() || GetDefault<UInputSettings>()->bUseMouseForTouch )
	{
		bResult = true;
		InputComponent->BindTouch(EInputEvent::IE_Pressed, this, &AItemSampleCharacter::BeginTouch);
		InputComponent->BindTouch(EInputEvent::IE_Released, this, &AItemSampleCharacter::EndTouch);
		InputComponent->BindTouch(EInputEvent::IE_Repeat, this, &AItemSampleCharacter::TouchUpdate);
	}
	return bResult;
}

AUsableItem* AItemSampleCharacter::ApplyPostProcessing(AUsableItem* itemSeen, AUsableItem* oldFocus){
	if (itemSeen){
		// An item is currently being looked at
		if (itemSeen == oldFocus || oldFocus == NULL){
			//The item being looked at is the same as the one on the last tick
			UStaticMeshComponent* mesh = itemSeen->GetStaticMeshComponent();
			mesh->SetRenderCustomDepth(true);

		}
		else if (oldFocus != NULL){
			// An item is being looked at and the old focus was not null (and not the same as the one on the last tick)
			UStaticMeshComponent* mesh = itemSeen->GetStaticMeshComponent();
			mesh->SetRenderCustomDepth(true);

			UStaticMeshComponent* oldMesh = oldFocus->GetStaticMeshComponent();
			oldMesh->SetRenderCustomDepth(false);
		}

		return oldFocus = itemSeen;
	}
	else{
		// No item currectly being looked at
		if (oldFocus != NULL){
			//An item was looked at last tick but isn't being looked at anymore
			UStaticMeshComponent* mesh = oldFocus->GetStaticMeshComponent();
			mesh->SetRenderCustomDepth(false);
		}

		return oldFocus = NULL;
	}

}

AUsableItem* AItemSampleCharacter::GetItemFocus(){
	// Attempt to use Raycasts to view an object and echo it back
	FVector CameraLocation;
	FRotator CameraRotation;

	Controller->GetPlayerViewPoint(CameraLocation, CameraRotation);
	const FVector StartTrace = CameraLocation;
	const FVector Direction = CameraRotation.Vector();
	const FVector EndTrace = StartTrace + Direction * 300; //where 300 is the distance it checks

	FCollisionQueryParams TraceParams(FName(TEXT("")), true, this);
	TraceParams.bTraceAsyncScene = true;
	TraceParams.bReturnPhysicalMaterial = true;

	FHitResult Hit(ForceInit);
	GetWorld()->LineTraceSingleByChannel(Hit, StartTrace, EndTrace, COLLISION_VIEW, TraceParams);

	return Cast<AUsableItem>(Hit.GetActor());

}