import { WorkerMessage } from './shader/types';
import { InputManager } from './shader/core/InputManager';
import { WorkerPool } from './shader/core/WorkerPool';
import { RenderController } from './shader/core/RenderController';

/**
 * Refactored shader renderer with separated concerns
 * Demonstrates the benefits of extracting responsibilities from the God class
 */
export class RefactoredShader {
  private canvas: HTMLCanvasElement;
  private ctx: CanvasRenderingContext2D;
  private code: string;
  
  // Extracted components with single responsibilities
  private inputManager: InputManager;
  private workerPool: WorkerPool;
  private renderController: RenderController;
  
  // Render state
  private compiled: boolean = false;
  private renderMode: string = 'classic';
  private valueMode: string = 'integer';
  private hueShift: number = 0;

  // Reusable message object for performance
  private reusableMessage: WorkerMessage = {
    id: '',
    type: 'render',
    width: 0,
    height: 0,
    fullWidth: 0,
    fullHeight: 0,
    time: 0,
    renderMode: 'classic',
    valueMode: 'integer',
    hueShift: 0,
    mouseX: 0,
    mouseY: 0,
    mousePressed: false,
    mouseVX: 0,
    mouseVY: 0,
    mouseClickTime: 0,
    touchCount: 0,
    touch0X: 0,
    touch0Y: 0,
    touch1X: 0,
    touch1Y: 0,
    pinchScale: 1,
    pinchRotation: 0,
    accelX: 0,
    accelY: 0,
    accelZ: 0,
    gyroX: 0,
    gyroY: 0,
    gyroZ: 0,
    audioLevel: 0,
    bassLevel: 0,
    midLevel: 0,
    trebleLevel: 0,
    bpm: 120,
    startY: 0,
  };

  constructor(canvas: HTMLCanvasElement, code: string = 'x^y') {
    this.canvas = canvas;
    this.ctx = canvas.getContext('2d')!;
    this.code = code;

    // Initialize separated components
    this.inputManager = new InputManager();
    this.workerPool = new WorkerPool();
    this.renderController = new RenderController();

    this.setupEventHandlers();
    this.compile();
  }

  private setupEventHandlers(): void {
    // Set up render controller callback
    this.renderController.setRenderFrameHandler((time, renderId) => {
      this.render(renderId, time);
    });

    // Set up worker pool callbacks
    this.workerPool.setRenderCompleteHandler((imageData) => {
      this.ctx.putImageData(imageData, 0, 0);
      this.renderController.setRenderingState(false);
    });

    this.workerPool.setErrorHandler((error) => {
      console.error('Rendering error:', error);
      this.renderController.setRenderingState(false);
    });
  }

  async compile(): Promise<void> {
    try {
      await this.workerPool.compile(this.code);
      this.compiled = true;
      console.log('Shader compiled successfully');
    } catch (error) {
      console.error('Compilation failed:', error);
      this.compiled = false;
      throw error;
    }
  }

  private render(id: string, currentTime: number): void {
    if (!this.compiled || this.renderController.isCurrentlyRendering()) {
      return;
    }

    this.renderController.setRenderingState(true);
    this.renderController.addPendingRender(id);

    // Update reusable message to avoid allocations
    this.reusableMessage.id = id;
    this.reusableMessage.width = this.canvas.width;
    this.reusableMessage.height = this.canvas.height;
    this.reusableMessage.fullWidth = this.canvas.width;
    this.reusableMessage.fullHeight = this.canvas.height;
    this.reusableMessage.time = currentTime;
    this.reusableMessage.renderMode = this.renderMode;
    this.reusableMessage.valueMode = this.valueMode;
    this.reusableMessage.hueShift = this.hueShift;

    // Populate input data from InputManager
    this.inputManager.populateWorkerMessage(this.reusableMessage);

    // Choose rendering strategy based on worker count
    if (this.workerPool.getWorkerCount() > 1) {
      this.workerPool.renderMultiWorker(
        this.reusableMessage,
        this.canvas.width,
        this.canvas.height
      );
    } else {
      this.workerPool.renderSingleWorker(this.reusableMessage);
    }
  }

  // Public API methods
  start(): void {
    if (!this.compiled) {
      console.warn('Cannot start rendering: shader not compiled');
      return;
    }
    this.renderController.start();
  }

  stop(): void {
    this.renderController.stop();
  }

  setCode(code: string): Promise<void> {
    this.code = code;
    this.compiled = false;
    return this.compile();
  }

  setRenderMode(mode: string): void {
    this.renderMode = mode;
  }

  setValueMode(mode: string): void {
    this.valueMode = mode;
  }

  setHueShift(shift: number): void {
    this.hueShift = shift;
  }

  setTargetFPS(fps: number): void {
    this.renderController.setTargetFPS(fps);
  }

  setTimeSpeed(speed: number): void {
    this.renderController.setTimeSpeed(speed);
  }

  // Input methods - delegated to InputManager
  setMousePosition(x: number, y: number): void {
    this.inputManager.setMousePosition(x, y);
  }

  setMousePressed(pressed: boolean): void {
    this.inputManager.setMousePressed(pressed);
  }

  setMouseVelocity(vx: number, vy: number): void {
    this.inputManager.setMouseVelocity(vx, vy);
  }

  setTouchData(
    count: number,
    x0: number = 0,
    y0: number = 0,
    x1: number = 0,
    y1: number = 0,
    scale: number = 1,
    rotation: number = 0
  ): void {
    this.inputManager.setTouchData(count, x0, y0, x1, y1, scale, rotation);
  }

  setAccelerometer(x: number, y: number, z: number): void {
    this.inputManager.setAccelerometer(x, y, z);
  }

  setGyroscope(x: number, y: number, z: number): void {
    this.inputManager.setGyroscope(x, y, z);
  }

  setAudioLevels(
    level: number,
    bass: number,
    mid: number,
    treble: number,
    bpm: number
  ): void {
    this.inputManager.setAudioLevels(level, bass, mid, treble, bpm);
  }

  // Getters
  isCompiled(): boolean {
    return this.compiled;
  }

  isAnimating(): boolean {
    return this.renderController.isAnimating();
  }

  getCurrentTime(): number {
    return this.renderController.getCurrentTime();
  }

  getFrameRate(): number {
    return this.renderController.getFrameRate();
  }

  getWorkerCount(): number {
    return this.workerPool.getWorkerCount();
  }

  // Cleanup
  destroy(): void {
    this.renderController.stop();
    this.workerPool.destroy();
  }

  // Helper methods for generating example shader code
  static getExamples(): string[] {
    return [
      'x^y',
      'x|y',
      '(x+y+t*10)%256',
      '((x>>4)^(y>>4))<<4',
      '(x^y^(x*y))%256',
      'd * t / 2.0',
      '((x&y)|(x^y))%256',
      '(x+y)&255',
      'x%y',
      '((x*t)^y)%256',
      '(x&(y|t*8))%256',
      'a+d*t',
      'n*t*400',
      '((x>>2)|(y<<2))%88',
      '(x*y*t)%256',
      '(x+y*t)%256',
      '(x^y^(t*16))%256',
      '((x*t)&(y*t))%256',
      '(x+(y<<(t%4)))%256',
      '((x*t%128)^y)%256',
      '(x^(y*t*2))%256',
      '((x+t)*(y+t))%256',
      '(x&y&(t*8))%256',
      '((x|t)^(y|t))%256',
    ];
  }
}