/**
 * Base Visualizer Class
 * Abstract base for all audio visualizers
 */

import * as THREE from 'three';

export class BaseVisualizer {
  constructor(scene) {
    this.scene = scene;
    this.mesh = null;
    this.isVisible = false;
  }

  /**
   * Initialize geometry, materials, and mesh
   * Override in subclasses
   */
  init() {
    throw new Error('init() must be implemented by subclass');
  }

  /**
   * Update visualizer with audio data
   * @param {Object} bands - { low, mid, high } frequency bands (0-1)
   * @param {number} time - Animation time
   */
  update(bands, time) {
    throw new Error('update() must be implemented by subclass');
  }

  /**
   * Add visualizer to scene
   */
  show() {
    if (this.mesh && !this.isVisible) {
      this.scene.add(this.mesh);
      this.isVisible = true;
    }
  }

  /**
   * Remove visualizer from scene
   */
  hide() {
    if (this.mesh && this.isVisible) {
      this.scene.remove(this.mesh);
      this.isVisible = false;
    }
  }

  /**
   * Cleanup resources
   */
  dispose() {
    this.hide();
    if (this.mesh) {
      this.mesh.geometry?.dispose();
      if (this.mesh.material) {
        if (Array.isArray(this.mesh.material)) {
          this.mesh.material.forEach(m => m.dispose());
        } else {
          this.mesh.material.dispose();
        }
      }
    }
  }

  /**
   * Helper: Create shader material with common settings
   */
  createShaderMaterial(vertexShader, fragmentShader, uniforms = {}) {
    return new THREE.ShaderMaterial({
      vertexShader,
      fragmentShader,
      uniforms: {
        uTime: { value: 0 },
        uLow: { value: 0 },
        uMid: { value: 0 },
        uHigh: { value: 0 },
        ...uniforms
      },
      transparent: true,
      blending: THREE.AdditiveBlending,
      depthWrite: false
    });
  }
}

export default BaseVisualizer;