// Camera/Tests/FT_CameraSmoothing.ts

import { AC_Camera } from '#root/Camera/Components/AC_Camera.ts';
import { AC_DebugHUD } from '#root/Debug/Components/AC_DebugHUD.ts';
import { AC_InputDevice } from '#root/Input/Components/AC_InputDevice.ts';
import { AC_ToastSystem } from '#root/Toasts/Components/AC_ToastSystem.ts';
import { EFunctionalTestResult } from '#root/UE/EFunctionalTestResult.ts';
import { FunctionalTest } from '#root/UE/FunctionalTest.ts';
import { Vector } from '#root/UE/Vector.ts';

/**
 * Functional Test: Camera Smoothing System
 * Tests smooth interpolation vs instant rotation modes
 * Validates FInterpTo behavior and smoothing speed effects
 */
export class FT_CameraSmoothing extends FunctionalTest {
  // ════════════════════════════════════════════════════════════════════════════════════════
  //                                    GRAPHS
  // ════════════════════════════════════════════════════════════════════════════════════════

  // ────────────────────────────────────────────────────────────────────────────────────────
  // EventGraph
  // ────────────────────────────────────────────────────────────────────────────────────────

  /**
   * Test execution - validates smoothing behavior
   * Tests instant vs smooth rotation and interpolation accuracy
   */
  EventStartTest(): void {
    // Initialize system
    this.ToastSystemComponent.InitializeToastSystem();
    this.InputDeviceComponent.InitializeDeviceDetection(
      this.ToastSystemComponent,
      this.DebugHUDComponent
    );
    this.CameraComponent.InitializeCameraSystem(
      this.InputDeviceComponent,
      this.DebugHUDComponent
    );

    // Test 1: Test smooth rotation behavior
    this.CameraComponent.ProcessLookInput(new Vector(5.0, 0.0, 0.0), 0.016);

    // Before UpdateCameraRotation, current should still be 0
    if (this.CameraComponent.GetCameraRotation().Yaw === 0.0) {
      // After one update, should be moving toward target but not reached
      this.CameraComponent.UpdateCameraRotation(0.016);
      const afterUpdateYaw = this.CameraComponent.GetCameraRotation().Yaw;

      if (afterUpdateYaw !== 0.0) {
        // Test 2: Verify smoothing continues over multiple frames
        this.CameraComponent.UpdateCameraRotation(0.016);

        if (this.CameraComponent.GetCameraRotation().Yaw > afterUpdateYaw) {
          // Test 3: Test convergence to target after many updates
          this.CameraComponent.ProcessLookInput(
            new Vector(1.0, 0.0, 0.0),
            0.016
          );

          // Run many update cycles
          for (let i = 0; i < 100; i++) {
            this.CameraComponent.UpdateCameraRotation(0.016);
          }

          // Should have converged to target after many updates
          if (this.CameraComponent.GetCameraRotation().Yaw !== 0.0) {
            this.FinishTest(EFunctionalTestResult.Succeeded);
          } else {
            this.FinishTest(
              EFunctionalTestResult.Failed,
              'Smoothing should eventually reach target rotation'
            );
          }
        } else {
          this.FinishTest(
            EFunctionalTestResult.Failed,
            'Smoothing should continue to approach target'
          );
        }
      } else {
        this.FinishTest(
          EFunctionalTestResult.Failed,
          'Rotation should start moving after UpdateCameraRotation'
        );
      }
    } else {
      this.FinishTest(
        EFunctionalTestResult.Failed,
        'Current rotation should be 0 before UpdateCameraRotation'
      );
    }
  }

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

  /**
   * Camera system component - component under test
   * @category Components
   */
  private CameraComponent = new AC_Camera();

  /**
   * Input device detection system - required for camera initialization
   * @category Components
   */
  private InputDeviceComponent = new AC_InputDevice();

  /**
   * Toast notification system - required for input device initialization
   * @category Components
   */
  private ToastSystemComponent = new AC_ToastSystem();

  /**
   * Debug HUD system - displays test status and parameters
   * @category Components
   */
  private DebugHUDComponent = new AC_DebugHUD();
}