// Request Games © All rights reserved

// Source/TengriPlatformer/Character/TengriCharacter.h

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Pawn.h"
#include "InputActionValue.h"
#include "TengriCharacter.generated.h"

// Forward declarations
class UCapsuleComponent;
class USkeletalMeshComponent;
class UTengriMovementComponent;
class ATengriPickupActor;
class UArrowComponent;
class UInputMappingContext;
class UInputAction;

/**
 * Main player character class with item interaction and throwing mechanics.
 * Supports dynamic input context switching for item-based actions.
 */
UCLASS()
class TENGRIPLATFORMER_API ATengriCharacter : public APawn
{
	GENERATED_BODY()

public:
	ATengriCharacter();

protected:
	virtual void BeginPlay() override;
	virtual void SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) override;

public:	
	// ========================================================================
	//                           COMPONENTS
	// ========================================================================

	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Components")
	TObjectPtr<UCapsuleComponent> CapsuleComponent;

	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Components")
	TObjectPtr<USkeletalMeshComponent> Mesh;

	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Components")
	TObjectPtr<UArrowComponent> ArrowComponent;

	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Components")
	TObjectPtr<UTengriMovementComponent> MovementComponent;

	// ========================================================================
	//                           INPUT CONFIG
	// ========================================================================

	/** Interact action (E / Square) - Always available */
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Input")
	TObjectPtr<UInputAction> InteractAction;

	/** Throw action (LMB / R2) - Active only in ItemHeld context */
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Input")
	TObjectPtr<UInputAction> ThrowAction;

	/** Aim action (RMB / L2) - Active only in ItemHeld context */
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Input")
	TObjectPtr<UInputAction> AimAction;

	/** Input mapping context for item-equipped state (Priority 1) */
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Input")
	TObjectPtr<UInputMappingContext> ItemHeldMappingContext;

	// ========================================================================
	//                           INTERACTION API
	// ========================================================================

	/**
	 * Handle interact button (E/Square).
	 * Behavior:
	 * - If holding item: Drop gently with small forward impulse
	 * - If empty hands: Pick up nearest item in radius
	 */
	UFUNCTION(BlueprintCallable, Category = "Interaction")
	void Interact();

	/**
	 * Execute throw action (LMB/R2).
	 * Uses camera-based raycasting for precise trajectory calculation.
	 * Automatically rotates character to face throw direction.
	 * @note Only callable when HeldItem is valid
	 */
	void OnThrowInput();

	/**
	 * Handle aim input state changes (RMB/L2).
	 * Toggles strafe mode on MovementComponent for camera-aligned rotation.
	 * @param Value - Input action value (true = pressed, false = released)
	 */
	void OnAimInput(const FInputActionValue& Value);

	/** Check if character is currently holding an item */
	UFUNCTION(BlueprintPure, Category = "Interaction")
	bool HasItem() const { return HeldItem != nullptr; }

protected:
	// ========================================================================
	//                           INTERACTION STATE
	// ========================================================================

	/** Currently held item reference (nullptr if empty-handed) */
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Interaction|State")
	TObjectPtr<ATengriPickupActor> HeldItem;

	/** Aiming state flag (affects camera and animation) */
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Interaction|State")
	bool bIsAiming = false;

	// ========================================================================
	//                           INTERACTION CONFIG
	// ========================================================================

	/** Socket name on character mesh for attaching held items */
	UPROPERTY(EditDefaultsOnly, Category = "Interaction|Config")
	FName HandSocketName = FName("HandSocket");

	/** Sphere radius for detecting nearby pickups (cm) */
	UPROPERTY(EditDefaultsOnly, Category = "Interaction|Config")
	float PickupRadius = 150.0f;

	/** Throw velocity magnitude (cm/s) */
	UPROPERTY(EditDefaultsOnly, Category = "Interaction|Config")
	float ThrowForce = 1200.0f;

	/** Gentle drop impulse for interact-to-drop (cm/s) */
	UPROPERTY(EditDefaultsOnly, Category = "Interaction|Config")
	float GentleDropSpeed = 50.0f;

	/** Raycast distance for throw targeting (cm) */
	UPROPERTY(EditDefaultsOnly, Category = "Interaction|Config")
	float ThrowTraceDistance = 5000.0f;

	/** Arc elevation adjustment for throw trajectory */
	UPROPERTY(EditDefaultsOnly, Category = "Interaction|Config")
	float ThrowArcElevation = 0.15f;

private:
	/**
	 * Find nearest interactable pickup within radius.
	 * Uses sphere overlap against PhysicsBody and WorldDynamic channels.
	 * @return Nearest valid pickup, or nullptr if none found
	 */
	ATengriPickupActor* FindNearestPickup() const;

	/**
	 * Toggle ItemHeld input mapping context on/off.
	 * Manages context priority to enable/disable throw and aim actions.
	 * @param bEnable - True to add context, false to remove
	 */
	void ToggleItemHeldContext(bool bEnable) const;
};