// Movement/AC_Movement.ts

import type { AC_DebugHUD } from '#root/Debug/Components/AC_DebugHUD.ts';
import { BFL_MovementProcessor } from '#root/Movement/Core/BFL_MovementProcessor.ts';
import type { DA_MovementConfig } from '#root/Movement/Core/DA_MovementConfig.ts';
import { DA_MovementConfigDefault } from '#root/Movement/Core/DA_MovementConfigDefault.ts';
import { E_MovementState } from '#root/Movement/Core/E_MovementState.ts';
import type { S_MovementState } from '#root/Movement/Core/S_MovementState.ts';
import { E_SurfaceType } from '#root/Movement/Surface/E_SurfaceType.ts';
import { S_AngleThresholds } from '#root/Movement/Surface/S_AngleThresholds.ts';
import { ActorComponent } from '#root/UE/ActorComponent.ts';
import type { CapsuleComponent } from '#root/UE/CapsuleComponent.ts';
import type { Float } from '#root/UE/Float.ts';
import { HitResult } from '#root/UE/HitResult.ts';
import { MathLibrary } from '#root/UE/MathLibrary.ts';
import { Rotator } from '#root/UE/Rotator.ts';
import { StringLibrary } from '#root/UE/StringLibrary.ts';
import { SystemLibrary } from '#root/UE/SystemLibrary.ts';
import { Vector } from '#root/UE/Vector.ts';

/**
 * Movement System Component
 * Core deterministic movement system for 3D platformer
 * Handles surface classification and movement physics calculations
 */
export class AC_Movement extends ActorComponent {
  // ════════════════════════════════════════════════════════════════════════════════════════
  //                                    FUNCTIONS
  // ════════════════════════════════════════════════════════════════════════════════════════

  // ────────────────────────────────────────────────────────────────────────────────────────
  // Debug
  // ────────────────────────────────────────────────────────────────────────────────────────

  /**
   * Update debug HUD with current movement info
   * @category Debug
   */
  public UpdateDebugPage(): void {
    if (SystemLibrary.IsValid(this.DebugHUDComponent)) {
      if (
        this.DebugHUDComponent.ShouldUpdatePage(
          this.DebugPageID,
          SystemLibrary.GetGameTimeInSeconds()
        )
      ) {
        this.DebugHUDComponent.UpdatePageContent(
          this.DebugPageID,
          // Constants
          `Max Speed: ${this.Config.MaxSpeed}\n` +
            `Acceleration: ${this.Config.Acceleration}\n` +
            `Friction: ${this.Config.Friction}\n` +
            `Gravity: ${this.Config.Gravity}\n` +
            `Initialized: ${this.IsInitialized}\n` +
            `\n` +
            // Current State
            `Current Velocity: ${StringLibrary.ConvVectorToString(this.CurrentMovementState.Velocity)}\n` +
            `Speed: ${this.CurrentMovementState.Speed}\n` +
            `Is Grounded: ${this.CurrentMovementState.IsGrounded}\n` +
            `Surface Type: ${this.CurrentMovementState.SurfaceType}\n` +
            `Movement State: ${this.CurrentMovementState.MovementState}\n` +
            `Input Magnitude: ${this.CurrentMovementState.InputMagnitude}` +
            `\n` +
            // Rotation
            `Current Yaw: ${this.CurrentMovementState.Rotation.yaw}\n` +
            `Rotation Delta: ${this.CurrentMovementState.RotationDelta}\n°` +
            `Is Rotating: ${this.CurrentMovementState.IsRotating}\n` +
            `Rotation Speed: ${this.Config.RotationSpeed}\n°` +
            `Min Speed: ${this.Config.MinSpeedForRotation}` +
            `\n` +
            // Position
            `Location: ${StringLibrary.ConvVectorToString(this.GetOwner().GetActorLocation())}` +
            `\n` +
            // Sweep Collision
            `Collision Checks: ${this.CurrentMovementState.CollisionCount}/${this.Config.MaxCollisionChecks}\n` +
            `Sweep Blocked: ${this.CurrentMovementState.IsBlocked}\n` +
            `Ground Distance: ${this.Config.GroundTraceDistance} cm`
        );
      }
    }
  }

  // ────────────────────────────────────────────────────────────────────────────────────────
  // Default
  // ────────────────────────────────────────────────────────────────────────────────────────

  /**
   * Process movement input from player controller
   * Normalizes input and calculates target velocity
   * @param InputVector - Raw input from WASD/gamepad stick
   * @param DeltaTime - Time since last frame for frame-rate independence
   * @category Default
   */
  public ProcessMovementInput(InputVector: Vector, DeltaTime: Float): void {
    if (this.IsInitialized) {
      this.CurrentMovementState = BFL_MovementProcessor.ProcessMovement(
        this.CurrentMovementState,
        {
          InputVector,
          DeltaTime,
          CapsuleComponent: this.CapsuleComponent,
          Config: this.Config,
          AngleThresholdsRads: this.AngleThresholdsRads,
        },
        SystemLibrary.IsValid(this.DebugHUDComponent)
          ? this.DebugHUDComponent.ShowVisualDebug
          : false
      );

      this.GetOwner().SetActorLocation(this.CurrentMovementState.Location);
      this.GetOwner().SetActorRotation(this.CurrentMovementState.Rotation);
    }
  }

  /**
   * Initialize movement system with angle conversion
   * Converts degree thresholds to radians for runtime performance
   * @category Default
   */
  public InitializeMovementSystem(
    CapsuleComponentRef: CapsuleComponent | null = null,
    DebugHUDComponentRef: AC_DebugHUD | null = null
  ): void {
    this.CapsuleComponent = CapsuleComponentRef;
    this.DebugHUDComponent = DebugHUDComponentRef;
    this.IsInitialized = true;

    this.AngleThresholdsRads = {
      Walkable: MathLibrary.DegreesToRadians(
        this.Config.AngleThresholdsDegrees.Walkable
      ),
      SteepSlope: MathLibrary.DegreesToRadians(
        this.Config.AngleThresholdsDegrees.SteepSlope
      ),
      Wall: MathLibrary.DegreesToRadians(
        this.Config.AngleThresholdsDegrees.Wall
      ),
    };

    this.CurrentMovementState = BFL_MovementProcessor.CreateInitialState(
      this.GetOwner().GetActorLocation(),
      this.GetOwner().GetActorRotation()
    );

    if (SystemLibrary.IsValid(this.DebugHUDComponent)) {
      this.DebugHUDComponent.AddDebugPage(
        this.DebugPageID,
        'Movement Info',
        60
      );
    }
  }

  // ════════════════════════════════════════════════════════════════════════════════════════
  //                                    VARIABLES
  // ════════════════════════════════════════════════════════════════════════════════════════

  // ────────────────────────────────────────────────────────────────────────────────────────
  // Components
  // ────────────────────────────────────────────────────────────────────────────────────────

  /**
   * Reference to debug HUD component for displaying camera info
   * Optional, used for debugging purposes
   * @category Components
   */
  private DebugHUDComponent: AC_DebugHUD | null = null;

  /**
   * Reference to character's capsule component for collision detection
   * @category Components
   */
  private CapsuleComponent: CapsuleComponent | null = null;

  // ────────────────────────────────────────────────────────────────────────────────────────
  // Default
  // ────────────────────────────────────────────────────────────────────────────────────────

  /**
   * Default movement state
   * @category Default
   */
  private CurrentMovementState: S_MovementState = {
    Location: new Vector(0, 0, 0),
    Rotation: new Rotator(0, 0, 0),
    Velocity: new Vector(0, 0, 0),
    Speed: 0.0,
    IsGrounded: false,
    GroundHit: new HitResult(),
    SurfaceType: E_SurfaceType.None,
    IsBlocked: false,
    CollisionCount: 0,
    IsRotating: false,
    RotationDelta: 0.0,
    MovementState: E_MovementState.Idle,
    InputMagnitude: 0.0,
  };

  /**
   * Default movement configuration
   * @category Default
   * @instanceEditable true
   */
  private readonly Config: DA_MovementConfig = new DA_MovementConfigDefault();

  /**
   * Runtime cached angle thresholds in radians
   * Converted from degrees during initialization for performance
   * @category Default
   */
  private AngleThresholdsRads: S_AngleThresholds = {
    Walkable: 0.0,
    SteepSlope: 0.0,
    Wall: 0.0,
  };

  /**
   * Debug page identifier for organizing debug output
   * Used by debug HUD to categorize information
   * @category Default
   * @instanceEditable true
   */
  private readonly DebugPageID: string = 'MovementInfo';

  /**
   * Flag indicating if movement system has been initialized
   * Ensures angle thresholds are converted before use
   * @category Debug
   */
  private IsInitialized = false;
}