// Request Games © All rights reserved

// Source/TengriPlatformer/Movement/Core/TengriMovementConfig.h

#pragma once

#include "CoreMinimal.h"
#include "Engine/DataAsset.h"
#include "TengriMovementConfig.generated.h"

// ============================================================================
//                          SURFACE THRESHOLDS
// ============================================================================

/**
 * Pre-calculated cosine thresholds for surface classification.
 * Generated from angle degrees in UTengriMovementConfig.
 */
USTRUCT(BlueprintType)
struct TENGRIPLATFORMER_API FSurfaceThresholds
{
	GENERATED_BODY()

	/** Minimum Normal.Z for walkable floor (cos of max walkable angle) */
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Thresholds")
	float WalkableZ = 0.64f;

	/** Minimum Normal.Z for steep slopes */
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Thresholds")
	float SteepSlopeZ = 0.08f;

	/** Minimum Normal.Z for walls (below = ceiling/overhang) */
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Thresholds")
	float WallZ = -0.08f;

	// === Classification Helpers ===

	FORCEINLINE bool IsWalkable(const float NormalZ) const
	{
		return NormalZ >= WalkableZ;
	}

	FORCEINLINE bool IsSteepSlope(const float NormalZ) const
	{
		return NormalZ >= SteepSlopeZ && NormalZ < WalkableZ;
	}

	FORCEINLINE bool IsWall(const float NormalZ) const
	{
		return NormalZ >= WallZ && NormalZ < SteepSlopeZ;
	}

	FORCEINLINE bool IsOverhang(const float NormalZ) const
	{
		return NormalZ < WallZ;
	}
};

// ============================================================================
//                         MOVEMENT CONFIG
// ============================================================================

/**
 * Data asset containing all movement system parameters.
 * Create instances in Content Browser for different character types.
 */
UCLASS(BlueprintType)
class TENGRIPLATFORMER_API UTengriMovementConfig : public UDataAsset
{
	GENERATED_BODY()

public:
	// ========================================================================
	//                              PHYSICS
	// ========================================================================

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Physics")
	float MaxSpeed = 800.0f;

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Physics")
	float Acceleration = 2048.0f;

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Physics")
	float Friction = 8.0f;

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Physics")
	float RotationSpeed = 360.0f;

	/** Minimum speed (cm/s) required to rotate character toward movement */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Physics")
	float MinSpeedForRotation = 10.0f;

	// ========================================================================
	//                        JUMP CONFIGURATION
	// ========================================================================

	/** Target height of the jump in cm (UE units) */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Jump", meta = (ClampMin = "10.0"))
	float MaxJumpHeight = 200.0f;

	/** Minimum height for a short hop (when button is released early) */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Jump", meta = (ClampMin = "1.0"))
	float MinJumpHeight = 40.0f;

	/** Time (seconds) to reach the peak of the jump. Defines "heaviness". */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Jump", meta = (ClampMin = "0.1", ClampMax = "2.0"))
	float TimeToJumpApex = 0.5f;

	// ========================================================================
	//                        JUMP FEEL (TIMINGS)
	// ========================================================================

	/** Time (seconds) after falling off a ledge during which jump is still allowed */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Jump|Feel", meta = (ClampMin = "0.0"))
	float CoyoteTime = 0.15f;

	/** Time (seconds) to buffer a jump input before hitting the ground */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Jump|Feel", meta = (ClampMin = "0.0"))
	float JumpBufferTime = 0.15f;

	// ========================================================================
	//                        AIR PHYSICS
	// ========================================================================

	/** Multiplier for acceleration when in air (0 = no control, 1 = full control) */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Air Physics", meta = (ClampMin = "0.0", ClampMax = "1.0"))
	float AirControl = 0.5f;

	/** Friction applied while in air (usually 0 for platformers) */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Air Physics")
	float AirFriction = 0.0f;

	// ========================================================================
	//                     CALCULATED VALUES (READ ONLY)
	// ========================================================================

	/** Gravity magnitude calculated from Jump Height & Time */
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Calculated")
	float Gravity = 980.0f;

	/** Initial Z velocity required to reach MaxJumpHeight */
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Calculated")
	float JumpVelocity = 0.0f;

	/** Velocity cut-off for variable jump height */
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Calculated")
	float MinJumpVelocity = 0.0f;

	// ========================================================================
	//                        AIR PHYSICS
	// ========================================================================

	/** Multiplier for gravity when falling. Makes jump feel "heavy" and snappy. */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Air Physics", meta = (ClampMin = "1.0"))
	float FallingGravityScale = 1.5f;

	/** Maximum falling speed (cm/s). Prevents infinite acceleration. */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Air Physics", meta = (ClampMin = "0.0"))
	float TerminalVelocity = 2000.0f;

	/** Z velocity threshold to consider a landing "heavy" (e.g. for landing animation/shake) */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Air Physics")
	float HeavyLandVelocityThreshold = -1000.0f;

	// ========================================================================
	//                          SURFACE ANGLES
	// ========================================================================

	/** Maximum angle (degrees) that counts as walkable floor */
	UPROPERTY(EditAnywhere, Category = "Surface Angles", meta = (ClampMin = "0", ClampMax = "89"))
	float WalkableAngleDeg = 50.0f;

	/** Maximum angle for steep slopes (limited movement) */
	UPROPERTY(EditAnywhere, Category = "Surface Angles", meta = (ClampMin = "0", ClampMax = "89"))
	float SteepSlopeAngleDeg = 85.0f;

	/** Maximum angle for walls (above = ceiling) */
	UPROPERTY(EditAnywhere, Category = "Surface Angles", meta = (ClampMin = "90", ClampMax = "180"))
	float WallAngleDeg = 95.0f;

	// ========================================================================
	//                            COLLISION
	// ========================================================================

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Collision")
	int32 MaxSlideIterations = 3;

	/** Maximum height of step that can be walked over */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Collision")
	float MaxStepHeight = 45.0f;

	// ========================================================================
	//                         GROUND SNAPPING
	// ========================================================================

	/** Distance to search for ground when snapping */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Ground Snapping")
	float GroundSnapDistance = 20.0f;

	/** Micro-offset above ground to prevent floor penetration */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Ground Snapping")
	float GroundSnapOffset = 0.15f;

	// ========================================================================
	//                           SLOPE PHYSICS
	// ========================================================================

	/** Velocity damping on steep slopes (0 = full stop, 1 = full slide) */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Physics", meta = (ClampMin = "0", ClampMax = "1"))
	float SteepSlopeSlideFactor = 0.0f;

	// ========================================================================
	//                         FIXED TIMESTEP
	// ========================================================================

	/** Physics update rate in Hz (default: 120) */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Fixed Timestep",
		meta = (ClampMin = "30", ClampMax = "240"))
	float PhysicsTickRate = 120.0f;

	/** Maximum accumulated time before clamping (prevents spiral of death) */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Fixed Timestep",
		meta = (ClampMin = "0.05", ClampMax = "0.5"))
	float MaxAccumulatedTime = 0.1f;

	/** Enable interpolation between physics states */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Fixed Timestep")
	bool bEnableInterpolation = true;

	// ========================================================================
	//                              API
	// ========================================================================

	/** Converts degree angles to cosine thresholds for runtime use */
	FSurfaceThresholds GetThresholds() const;

#if WITH_EDITOR
	virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override;
#endif
};