#include "SpaceshipPawn.h"
#include "GameFramework/SpringArmComponent.h"
#include "Camera/CameraComponent.h"
#include "Components/StaticMeshComponent.h"
#include "EnhancedInputComponent.h"
#include "EnhancedInputSubsystems.h"
#include "SpaceshipProjectile.h"
#include "Kismet/GameplayStatics.h"
#include "GameFramework/GameUserSettings.h"
#include "Blueprint/UserWidget.h"


ASpaceshipPawn::ASpaceshipPawn()
{
    PrimaryActorTick.bCanEverTick = true;

    // Create ship mesh
    ShipMesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("ShipMesh"));
    RootComponent = ShipMesh;
    ShipMesh->SetSimulatePhysics(false);
    ShipMesh->SetEnableGravity(false);

    // Create projectile spawn point
    ProjectileSpawnPoint = CreateDefaultSubobject<USceneComponent>(TEXT("ProjectileSpawnPoint"));
    ProjectileSpawnPoint->SetupAttachment(ShipMesh);

    // Create camera spring arm
    CameraSpringArm = CreateDefaultSubobject<USpringArmComponent>(TEXT("CameraSpringArm"));
    CameraSpringArm->SetupAttachment(RootComponent);
    CameraSpringArm->TargetArmLength = 400.0f;
    CameraSpringArm->bEnableCameraLag = true;
    CameraSpringArm->CameraLagSpeed = 10.0f;
    CameraSpringArm->bEnableCameraRotationLag = true;
    CameraSpringArm->CameraRotationLagSpeed = 10.0f;
    CameraSpringArm->CameraLagMaxDistance = 7.0f;
    CameraSpringArm->bUsePawnControlRotation = false;
    CameraSpringArm->bInheritPitch = true;
    CameraSpringArm->bInheritYaw = true;
    CameraSpringArm->bInheritRoll = false;

    // Create camera
    Camera = CreateDefaultSubobject<UCameraComponent>(TEXT("Camera"));
    Camera->SetupAttachment(CameraSpringArm, USpringArmComponent::SocketName);

    // Initialize movement variables
    CurrentThrottleInput = 0.0f;
    CurrentStrafeInput = 0.0f;
    bThrottlePressed = false;
    CurrentVelocity = FVector::ZeroVector;
    CurrentPitch = 0.0f;
    CurrentYaw = 0.0f;
    TargetRotation = FRotator::ZeroRotator;
    LastMouseDelta = FVector2D::ZeroVector;

    if (ShipMesh)
    {
        ShipMesh->SetCollisionEnabled(ECollisionEnabled::QueryAndPhysics);
        ShipMesh->SetCollisionObjectType(ECC_GameTraceChannel1); // This is the "Player" channel
        ShipMesh->SetCollisionResponseToAllChannels(ECollisionResponse::ECR_Block);
        ShipMesh->SetCollisionResponseToChannel(ECC_GameTraceChannel1, ECollisionResponse::ECR_Ignore);
        ShipMesh->SetCollisionResponseToChannel(ECC_Pawn, ECollisionResponse::ECR_Ignore);
    }
}

void ASpaceshipPawn::BeginPlay()
{
    Super::BeginPlay();

    // Store player controller reference
    PlayerControllerRef = Cast<APlayerController>(Controller);

    if (PlayerControllerRef)
    {
        // Setup input mapping context
        if (UEnhancedInputLocalPlayerSubsystem* Subsystem = ULocalPlayer::GetSubsystem<UEnhancedInputLocalPlayerSubsystem>(PlayerControllerRef->GetLocalPlayer()))
        {
            Subsystem->AddMappingContext(DefaultMappingContext, 0);
        }

        // Setup mouse capture and fullscreen
        PlayerControllerRef->SetShowMouseCursor(false);
        PlayerControllerRef->SetInputMode(FInputModeGameOnly());

        // Request fullscreen mode using GameUserSettings
        UGameUserSettings* GameUserSettings = UGameUserSettings::GetGameUserSettings();
        if (GameUserSettings)
        {
            GameUserSettings->SetFullscreenMode(EWindowMode::Fullscreen);
            GameUserSettings->SetScreenResolution(FIntPoint(1920, 1080)); // Adjust the resolution if needed
            GameUserSettings->ApplySettings(false);
        }
    }

    // Create and add crosshair widget to viewport
    if (CrosshairWidgetClass)
    {
        APlayerController* PlayerController = Cast<APlayerController>(GetController());
        if (PlayerController)
        {
            CrosshairWidget = CreateWidget<UUserWidget>(PlayerController, CrosshairWidgetClass);
            if (CrosshairWidget)
            {
                CrosshairWidget->AddToViewport();
            }
        }
    }
}

void ASpaceshipPawn::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);

    // Update ship rotation first (common to all movement modes)
    UpdateShipRotation(DeltaTime);

    // Handle movement based on the selected movement mode
    switch (MovementMode)
    {
    case EShipMovementMode::Arcade:
        UpdateArcadeMovement(DeltaTime);
        break;

    case EShipMovementMode::Assisted:
        UpdateAssistedMovement(DeltaTime);
        break;

    case EShipMovementMode::Realistic:
        UpdateRealisticMovement(DeltaTime);
        break;
    }

    // Update position
    FVector NewLocation = GetActorLocation() + (CurrentVelocity * DeltaTime);
    SetActorLocation(NewLocation, true);

    // Reset mouse delta for next frame
    LastMouseDelta = FVector2D::ZeroVector;

    // Debug info
    if (GEngine)
    {
        GEngine->AddOnScreenDebugMessage(-1, 0.0f, FColor::Yellow,
            FString::Printf(TEXT("Mode: %s | Speed: %.1f"),
                MovementMode == EShipMovementMode::Arcade ? TEXT("Arcade") :
                MovementMode == EShipMovementMode::Assisted ? TEXT("Assisted") : TEXT("Realistic"),
                CurrentVelocity.Size()));

        GEngine->AddOnScreenDebugMessage(-1, 0.0f, FColor::Green,
            FString::Printf(TEXT("Throttle: %.2f | Strafe: %.2f"),
                CurrentThrottleInput, CurrentStrafeInput));
    }
}

void ASpaceshipPawn::UpdateShipRotation(float DeltaTime)
{
    // Smooth mouse movement
    MouseDeltaSmoothed = FMath::Vector2DInterpTo(
        MouseDeltaSmoothed,
        LastMouseDelta,
        DeltaTime,
        MouseSmoothingSpeed
    );

    // Update rotation based on smoothed mouse movement
    CurrentYaw += MouseDeltaSmoothed.X * MouseSensitivity * DeltaTime * 60.0f;
    CurrentPitch = FMath::ClampAngle(
        CurrentPitch + (MouseDeltaSmoothed.Y * MouseSensitivity * DeltaTime * 60.0f),
        -85.0f,
        85.0f
    );

    // Set target rotation
    TargetRotation = FRotator(CurrentPitch, CurrentYaw, 0.0f);

    // Smoothly interpolate to target rotation using quaternions for better interpolation
    FQuat CurrentQuat = GetActorQuat();
    FQuat TargetQuat = TargetRotation.Quaternion();
    FQuat NewQuat = FQuat::Slerp(CurrentQuat, TargetQuat, RotationSpeed * DeltaTime);
    SetActorRotation(NewQuat);

    // Update spring arm rotation to match ship with smooth interpolation
    if (CameraSpringArm)
    {
        FRotator SpringArmRotation = CameraSpringArm->GetComponentRotation();
        FRotator TargetSpringArmRotation = NewQuat.Rotator();
        FRotator NewSpringArmRotation = FMath::RInterpTo(
            SpringArmRotation,
            TargetSpringArmRotation,
            DeltaTime,
            RotationSpeed
        );
        CameraSpringArm->SetWorldRotation(NewSpringArmRotation);
    }
}

void ASpaceshipPawn::UpdateArcadeMovement(float DeltaTime)
{
    // In arcade mode, the ship moves exactly where it's pointed with minimal inertia
    FVector ForwardVector = GetActorForwardVector();
    FVector RightVector = GetActorRightVector();

    // Calculate desired velocity (forward/back + strafe)
    FVector DesiredVelocity = (ForwardVector * CurrentThrottleInput * MaxSpeed) +
        (RightVector * CurrentStrafeInput * (MaxSpeed * 0.7f)); // Strafe is slightly slower

    // Smoothly interpolate current velocity to desired velocity
    if (!FMath::IsNearlyZero(CurrentThrottleInput) || !FMath::IsNearlyZero(CurrentStrafeInput))
    {
        // Accelerating
        CurrentVelocity = FMath::VInterpTo(
            CurrentVelocity,
            DesiredVelocity,
            DeltaTime,
            Acceleration / MaxSpeed
        );
    }
    else if (bAutoBrakeEnabled)
    {
        // Auto-braking when no input
        CurrentVelocity = FMath::VInterpTo(
            CurrentVelocity,
            FVector::ZeroVector,
            DeltaTime,
            AutoBrakeStrength
        );
    }
    else
    {
        // Gradual deceleration
        float Speed = CurrentVelocity.Size();
        if (Speed > 0)
        {
            Speed = FMath::FInterpTo(Speed, 0, DeltaTime, Deceleration / MaxSpeed);
            CurrentVelocity = CurrentVelocity.GetSafeNormal() * Speed;
        }
    }
}

void ASpaceshipPawn::UpdateAssistedMovement(float DeltaTime)
{
    // Assisted mode - a middle ground with some inertia but stabilization assistance
    FVector ForwardVector = GetActorForwardVector();
    FVector RightVector = GetActorRightVector();

    // Calculate thrust force
    FVector ThrustForce = (ForwardVector * CurrentThrottleInput * Acceleration) +
        (RightVector * CurrentStrafeInput * (Acceleration * 0.7f));

    // Apply thrust to velocity
    CurrentVelocity += ThrustForce * DeltaTime;

    // Limit max speed
    float CurrentSpeed = CurrentVelocity.Size();
    if (CurrentSpeed > MaxSpeed)
    {
        CurrentVelocity = CurrentVelocity.GetSafeNormal() * MaxSpeed;
    }

    // Apply auto-stabilization (gradual slowdown) when not thrusting
    if (FMath::IsNearlyZero(CurrentThrottleInput) && FMath::IsNearlyZero(CurrentStrafeInput) && bAutoBrakeEnabled)
    {
        CurrentVelocity = FMath::VInterpTo(
            CurrentVelocity,
            FVector::ZeroVector,
            DeltaTime,
            StabilizationSpeed
        );
    }
}

void ASpaceshipPawn::UpdateRealisticMovement(float DeltaTime)
{
    // This is the original physics-based movement with momentum
    FVector CurrentDirection = GetActorForwardVector();
    FVector RightVector = GetActorRightVector();

    // Calculate thrust force (forward + strafe)
    FVector ThrustForce = (CurrentDirection * CurrentThrottleInput * Acceleration) +
        (RightVector * CurrentStrafeInput * (Acceleration * 0.7f));

    // Apply thrust to velocity
    CurrentVelocity += ThrustForce * DeltaTime;

    // Apply drag
    float DragCoefficient = 0.05f;
    FVector DragForce = -CurrentVelocity * DragCoefficient;
    CurrentVelocity += DragForce * DeltaTime;

    // Limit max speed
    float CurrentSpeed = CurrentVelocity.Size();
    if (CurrentSpeed > MaxSpeed)
    {
        CurrentVelocity = CurrentVelocity.GetSafeNormal() * MaxSpeed;
    }
}

void ASpaceshipPawn::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
    Super::SetupPlayerInputComponent(PlayerInputComponent);

    if (UEnhancedInputComponent* EnhancedInputComponent = CastChecked<UEnhancedInputComponent>(PlayerInputComponent))
    {
        // Bind throttle input 
        EnhancedInputComponent->BindAction(ThrottleAction, ETriggerEvent::Triggered, this, &ASpaceshipPawn::HandleThrottleInput);

        // Bind strafe input if available
        if (StrafeAction)
        {
            EnhancedInputComponent->BindAction(StrafeAction, ETriggerEvent::Triggered, this, &ASpaceshipPawn::HandleStrafeInput);
        }

        // Bind mouse control
        EnhancedInputComponent->BindAction(MouseLookAction, ETriggerEvent::Triggered, this, &ASpaceshipPawn::HandleMouseLook);

        // Add shooting binding
        EnhancedInputComponent->BindAction(ShootAction, ETriggerEvent::Triggered, this, &ASpaceshipPawn::HandleShoot);
    }
}

void ASpaceshipPawn::HandleThrottleInput(const FInputActionValue& Value)
{
    CurrentThrottleInput = Value.Get<float>();
    bThrottlePressed = !FMath::IsNearlyZero(CurrentThrottleInput);
}

void ASpaceshipPawn::HandleStrafeInput(const FInputActionValue& Value)
{
    CurrentStrafeInput = Value.Get<float>();
}

void ASpaceshipPawn::HandleMouseLook(const FInputActionValue& Value)
{
    const FVector2D MouseDelta = Value.Get<FVector2D>();
    LastMouseDelta = MouseDelta;
}

void ASpaceshipPawn::HandleShoot(const FInputActionValue& Value)
{
    // Debug message
    if (GEngine)
        GEngine->AddOnScreenDebugMessage(-1, 2.f, FColor::Yellow, TEXT("HandleShoot Called"));

    if (bCanFire)
    {
        Fire();
    }
}

void ASpaceshipPawn::Fire()
{
    // Debug messages
    if (!ProjectileClass)
    {
        if (GEngine)
            GEngine->AddOnScreenDebugMessage(-1, 2.f, FColor::Red, TEXT("ProjectileClass not set!"));
        return;
    }

    UWorld* World = GetWorld();
    if (World)
    {
        FVector SpawnLocation = ProjectileSpawnPoint->GetComponentLocation();
        FRotator SpawnRotation = GetActorRotation();

        FActorSpawnParameters SpawnParams;
        SpawnParams.Owner = this;
        SpawnParams.Instigator = GetInstigator();

        // Spawn the projectile
        ASpaceshipProjectile* Projectile = World->SpawnActor<ASpaceshipProjectile>(
            ProjectileClass,
            SpawnLocation,
            SpawnRotation,
            SpawnParams
        );

        if (Projectile)
        {
            if (GEngine)
                GEngine->AddOnScreenDebugMessage(-1, 2.f, FColor::Green, TEXT("Projectile Spawned"));
        }
        else
        {
            if (GEngine)
                GEngine->AddOnScreenDebugMessage(-1, 2.f, FColor::Red, TEXT("Failed to spawn projectile"));
        }

        // Start fire rate timer
        bCanFire = false;
        GetWorldTimerManager().SetTimer(FireTimerHandle, this, &ASpaceshipPawn::ResetFire, FireRate, false);
    }
}

void ASpaceshipPawn::ResetFire()
{
    bCanFire = true;
}