// Copyright Epic Games, Inc. All Rights Reserved.

#include "UTAD_UIPlayerController.h"
#include "GameFramework/Pawn.h"
#include "Blueprint/AIBlueprintHelperLibrary.h"
#include "NiagaraSystem.h"
#include "NiagaraFunctionLibrary.h"
#include "UTAD_UICharacter.h"
#include "Engine/World.h"
#include "EnhancedInputComponent.h"
#include "InputActionValue.h"
#include "EnhancedInputSubsystems.h"
#include "Engine/LocalPlayer.h"
#include "Blueprint/UserWidget.h"

DEFINE_LOG_CATEGORY(LogTemplateCharacter);

AUTAD_UIPlayerController::AUTAD_UIPlayerController()
{
	bShowMouseCursor   = true;
	DefaultMouseCursor = EMouseCursor::Default;
	CachedDestination  = FVector::ZeroVector;
	FollowTime		   = 0.f;
}

void AUTAD_UIPlayerController::BeginPlay()
{
	// Call the base class
	Super::BeginPlay();

	// Create and show the main HUD
	ShowMainHUD();
}

void AUTAD_UIPlayerController::SetupInputComponent()
{
	// set up gameplay key bindings
	Super::SetupInputComponent();

	// Add Input Mapping Context
	if (UEnhancedInputLocalPlayerSubsystem* Subsystem =
			ULocalPlayer::GetSubsystem<UEnhancedInputLocalPlayerSubsystem>(
				GetLocalPlayer()))
	{
		Subsystem->AddMappingContext(DefaultMappingContext, 0);
	}

	// Set up action bindings
	if (UEnhancedInputComponent* EnhancedInputComponent =
			Cast<UEnhancedInputComponent>(InputComponent))
	{
		// Setup mouse input events
		EnhancedInputComponent->BindAction(
			SetDestinationClickAction, ETriggerEvent::Started, this,
			&AUTAD_UIPlayerController::OnInputStarted);
		EnhancedInputComponent->BindAction(
			SetDestinationClickAction, ETriggerEvent::Triggered, this,
			&AUTAD_UIPlayerController::OnSetDestinationTriggered);
		EnhancedInputComponent->BindAction(
			SetDestinationClickAction, ETriggerEvent::Completed, this,
			&AUTAD_UIPlayerController::OnSetDestinationReleased);
		EnhancedInputComponent->BindAction(
			SetDestinationClickAction, ETriggerEvent::Canceled, this,
			&AUTAD_UIPlayerController::OnSetDestinationReleased);

		// Setup touch input events
		EnhancedInputComponent->BindAction(
			SetDestinationTouchAction, ETriggerEvent::Started, this,
			&AUTAD_UIPlayerController::OnInputStarted);
		EnhancedInputComponent->BindAction(
			SetDestinationTouchAction, ETriggerEvent::Triggered, this,
			&AUTAD_UIPlayerController::OnTouchTriggered);
		EnhancedInputComponent->BindAction(
			SetDestinationTouchAction, ETriggerEvent::Completed, this,
			&AUTAD_UIPlayerController::OnTouchReleased);
		EnhancedInputComponent->BindAction(
			SetDestinationTouchAction, ETriggerEvent::Canceled, this,
			&AUTAD_UIPlayerController::OnTouchReleased);

		// Setup skill tree input
		if (OpenSkillTreeAction)
		{
			EnhancedInputComponent->BindAction(
				OpenSkillTreeAction, ETriggerEvent::Started, this,
				&AUTAD_UIPlayerController::OnOpenSkillTree);
		}
	}
	else
	{
		UE_LOG(
			LogTemplateCharacter, Error,
			TEXT(
				"'%s' Failed to find an Enhanced Input Component! This template is built to use the Enhanced Input system. If you intend to use the legacy system, then you will need to update this C++ file."),
			*GetNameSafe(this));
	}
}

void AUTAD_UIPlayerController::OnInputStarted()
{
	StopMovement();
}

// Triggered every frame when the input is held down
void AUTAD_UIPlayerController::OnSetDestinationTriggered()
{
	// We flag that the input is being pressed
	FollowTime += GetWorld()->GetDeltaSeconds();

	// We look for the location in the world where the player has pressed the
	// input
	FHitResult Hit;
	bool	   bHitSuccessful = false;
	if (bIsTouch)
	{
		bHitSuccessful = GetHitResultUnderFinger(
			ETouchIndex::Touch1, ECollisionChannel::ECC_Visibility, true, Hit);
	}
	else
	{
		bHitSuccessful = GetHitResultUnderCursor(
			ECollisionChannel::ECC_Visibility, true, Hit);
	}

	// If we hit a surface, cache the location
	if (bHitSuccessful)
	{
		CachedDestination = Hit.Location;
	}

	// Move towards mouse pointer or touch
	APawn* ControlledPawn = GetPawn();
	if (ControlledPawn != nullptr)
	{
		FVector WorldDirection =
			(CachedDestination - ControlledPawn->GetActorLocation())
				.GetSafeNormal();
		ControlledPawn->AddMovementInput(WorldDirection, 1.0, false);
	}
}

void AUTAD_UIPlayerController::OnSetDestinationReleased()
{
	// If it was a short press
	if (FollowTime <= ShortPressThreshold)
	{
		// We move there and spawn some particles
		UAIBlueprintHelperLibrary::SimpleMoveToLocation(this,
														CachedDestination);
		UNiagaraFunctionLibrary::SpawnSystemAtLocation(
			this, FXCursor, CachedDestination, FRotator::ZeroRotator,
			FVector(1.f, 1.f, 1.f), true, true, ENCPoolMethod::None, true);
	}

	FollowTime = 0.f;
}

// Triggered every frame when the input is held down
void AUTAD_UIPlayerController::OnTouchTriggered()
{
	bIsTouch = true;
	OnSetDestinationTriggered();
}

void AUTAD_UIPlayerController::OnTouchReleased()
{
	bIsTouch = false;
	OnSetDestinationReleased();
}

void AUTAD_UIPlayerController::OnOpenSkillTree()
{
	ToggleSkillTree();
}

void AUTAD_UIPlayerController::ShowMainHUD()
{
	if (MainHUDClass && !MainHUDWidget)
	{
		MainHUDWidget = CreateWidget<UUserWidget>(this, MainHUDClass);
		if (MainHUDWidget)
		{
			MainHUDWidget->AddToViewport(0);
		}
	}
}

void AUTAD_UIPlayerController::ShowSkillTree()
{
	if (!SkillTreeWidget && SkillTreeWidgetClass)
	{
		SkillTreeWidget = CreateWidget<UUserWidget>(this, SkillTreeWidgetClass);
	}

	if (SkillTreeWidget && !SkillTreeWidget->IsInViewport())
	{
		SkillTreeWidget->AddToViewport(1);

		// Set input mode to Game and UI
		FInputModeGameAndUI InputMode;
		InputMode.SetWidgetToFocus(SkillTreeWidget->TakeWidget());
		InputMode.SetLockMouseToViewportBehavior(EMouseLockMode::DoNotLock);
		SetInputMode(InputMode);
		bShowMouseCursor = true;
	}
}

void AUTAD_UIPlayerController::HideSkillTree()
{
	if (SkillTreeWidget && SkillTreeWidget->IsInViewport())
	{
		SkillTreeWidget->RemoveFromParent();

		// Set input mode back to game and UI for top-down gameplay
		// This allows mouse clicks to work for character movement
		FInputModeGameAndUI InputMode;
		InputMode.SetLockMouseToViewportBehavior(EMouseLockMode::DoNotLock);
		InputMode.SetHideCursorDuringCapture(false);
		SetInputMode(InputMode);
		// Keep mouse cursor visible for top-down game
		bShowMouseCursor = true;
	}
}

void AUTAD_UIPlayerController::ToggleSkillTree()
{
	if (SkillTreeWidget && SkillTreeWidget->IsInViewport())
	{
		HideSkillTree();
	}
	else
	{
		ShowSkillTree();
	}
}