import { System } from '../ecs/System.js';
import { Invincibility } from '../components/Invincibility.js';
import { MeshComponent } from '../components/MeshComponent.js';
import { GameConfig } from '../game/GameConfig.js';

/**
 * InvincibilitySystem - handles invincibility flashing effect
 */
export class InvincibilitySystem extends System {
  constructor() {
    super();
    this.flashTimer = 0;
  }

  /**
   * Update invincibility timers and flash effect
   * @param {number} deltaTime - Time since last frame in seconds
   */
  update(deltaTime) {
    const entities = this.getEntities(Invincibility, MeshComponent);

    this.flashTimer += deltaTime;

    for (const entityId of entities) {
      const invincibility = this.getComponent(entityId, Invincibility);
      const meshComp = this.getComponent(entityId, MeshComponent);

      if (!invincibility || !meshComp) continue;

      // Update invincibility timer
      invincibility.update(deltaTime);

      // Flash effect - toggle visibility based on flash rate
      if (invincibility.getIsInvincible()) {
        const flashInterval = Math.floor(this.flashTimer / GameConfig.INVINCIBILITY_FLASH_RATE);
        meshComp.mesh.visible = flashInterval % 2 === 0;
      } else {
        // Always visible when not invincible
        meshComp.mesh.visible = true;
      }
    }

    // Reset flash timer periodically to prevent overflow
    if (this.flashTimer > 10) {
      this.flashTimer = 0;
    }
  }
}