// 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"
#include "SkillTree/SkillTreeComponent.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);

		// Use GameAndUI mode - allows Enhanced Input to work while UI is open
		// Mouse clicks will be consumed by UI widgets automatically
		FInputModeGameAndUI InputMode;
		InputMode.SetLockMouseToViewportBehavior(EMouseLockMode::DoNotLock);
		InputMode.SetHideCursorDuringCapture(false);
		SetInputMode(InputMode);
		bShowMouseCursor = true;

		// Switch input mapping context from gameplay to UI
		// This allows UI-specific controls (like Tab to close) to work
		if (UEnhancedInputLocalPlayerSubsystem* Subsystem =
				ULocalPlayer::GetSubsystem<UEnhancedInputLocalPlayerSubsystem>(
					GetLocalPlayer()))
		{
			// Remove gameplay context to prevent movement actions
			if (DefaultMappingContext)
			{
				Subsystem->RemoveMappingContext(DefaultMappingContext);
			}
			// Add UI context with higher priority
			if (UIMappingContext)
			{
				Subsystem->AddMappingContext(UIMappingContext, 1);
			}
		}
	}
}

void AUTAD_UIPlayerController::HideSkillTree()
{
	if (SkillTreeWidget && SkillTreeWidget->IsInViewport())
	{
		// Clear any unconfirmed skill selections
		if (const AUTAD_UICharacter* PlayerCharacter =
				Cast<AUTAD_UICharacter>(GetPawn()))
		{
			if (USkillTreeComponent* SkillTreeComp =
					PlayerCharacter->GetSkillTreeComponent())
			{
				SkillTreeComp->ClearSelection();
			}
		}

		SkillTreeWidget->RemoveFromParent();

		// Restore game and UI input mode for top-down gameplay
		FInputModeGameAndUI InputMode;
		InputMode.SetLockMouseToViewportBehavior(EMouseLockMode::DoNotLock);
		InputMode.SetHideCursorDuringCapture(false);
		SetInputMode(InputMode);
		bShowMouseCursor = true;

		// Switch input mapping context back from UI to gameplay
		if (UEnhancedInputLocalPlayerSubsystem* Subsystem =
				ULocalPlayer::GetSubsystem<UEnhancedInputLocalPlayerSubsystem>(
					GetLocalPlayer()))
		{
			// Remove UI context
			if (UIMappingContext)
			{
				Subsystem->RemoveMappingContext(UIMappingContext);
			}
			// Restore gameplay context
			if (DefaultMappingContext)
			{
				Subsystem->AddMappingContext(DefaultMappingContext, 0);
			}
		}
	}
}

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