/**
 * TwoQuarks Quantum Field - Ultra Blue Particle System
 * High-performance canvas animation with WebGL-style particles
 */

class QuantumField {
  constructor(canvasId) {
    this.canvas = document.getElementById(canvasId);
    if (!this.canvas) {
      console.warn(`Canvas ${canvasId} not found`);
      return;
    }
    
    this.ctx = this.canvas.getContext('2d', { alpha: false });
    this.particles = [];
    this.connections = [];
    this.mouse = { x: null, y: null, radius: 150 };
    
    // Ultra Blue color palette
    this.colors = {
      primary: 'rgba(39, 80, 146, 0.8)',      // #3B82F6
      bright: 'rgba(96, 165, 250, 0.6)',       // #60A5FA
      deep: 'rgba(30, 64, 175, 0.9)',          // #1E40AF
      glow: 'rgba(59, 130, 246, 0.15)',
      connection: 'rgba(59, 130, 246, 0.12)'
    };
    
    // Configuration
    this.config = {
      particleCount: 120,
      particleSpeed: 0.3,
      connectionDistance: 140,
      mouseInteraction: true,
      mouseRepelForce: 0.8,
      particleSize: { min: 1, max: 3 },
      glowEnabled: true
    };
    
    this.init();
  }
  
  init() {
    this.resize();
    this.createParticles();
    this.setupEventListeners();
    this.animate();
  }
  
  resize() {
    this.canvas.width = window.innerWidth;
    this.canvas.height = window.innerHeight;
  }
  
  createParticles() {
    this.particles = [];
    const { particleCount, particleSpeed, particleSize } = this.config;
    
    for (let i = 0; i < particleCount; i++) {
      this.particles.push({
        x: Math.random() * this.canvas.width,
        y: Math.random() * this.canvas.height,
        vx: (Math.random() - 0.5) * particleSpeed,
        vy: (Math.random() - 0.5) * particleSpeed,
        size: Math.random() * (particleSize.max - particleSize.min) + particleSize.min,
        color: this.getRandomColor(),
        brightness: Math.random() * 0.5 + 0.5
      });
    }
  }
  
  getRandomColor() {
    const colorOptions = [
      this.colors.primary,
      this.colors.bright,
      this.colors.deep
    ];
    return colorOptions[Math.floor(Math.random() * colorOptions.length)];
  }
  
  setupEventListeners() {
    window.addEventListener('resize', () => this.resize());
    
    if (this.config.mouseInteraction) {
      window.addEventListener('mousemove', (e) => {
        this.mouse.x = e.clientX;
        this.mouse.y = e.clientY;
      });
      
      window.addEventListener('mouseleave', () => {
        this.mouse.x = null;
        this.mouse.y = null;
      });
    }
  }
  
  updateParticles() {
    const { width, height } = this.canvas;
    const { mouseRepelForce } = this.config;
    
    this.particles.forEach(p => {
      // Mouse interaction - repel effect
      if (this.mouse.x !== null && this.mouse.y !== null) {
        const dx = p.x - this.mouse.x;
        const dy = p.y - this.mouse.y;
        const dist = Math.sqrt(dx * dx + dy * dy);
        
        if (dist < this.mouse.radius) {
          const force = (this.mouse.radius - dist) / this.mouse.radius;
          const angle = Math.atan2(dy, dx);
          p.vx += Math.cos(angle) * force * mouseRepelForce;
          p.vy += Math.sin(angle) * force * mouseRepelForce;
        }
      }
      
      // Update position
      p.x += p.vx;
      p.y += p.vy;
      
      // Damping
      p.vx *= 0.99;
      p.vy *= 0.99;
      
      // Boundary wrapping
      if (p.x < 0) p.x = width;
      if (p.x > width) p.x = 0;
      if (p.y < 0) p.y = height;
      if (p.y > height) p.y = 0;
      
      // Subtle brightness pulsing
      p.brightness += (Math.random() - 0.5) * 0.02;
      p.brightness = Math.max(0.3, Math.min(1, p.brightness));
    });
  }
  
  drawConnections() {
    const { connectionDistance } = this.config;
    this.ctx.strokeStyle = this.colors.connection;
    this.ctx.lineWidth = 0.5;
    
    for (let i = 0; i < this.particles.length; i++) {
      for (let j = i + 1; j < this.particles.length; j++) {
        const dx = this.particles[i].x - this.particles[j].x;
        const dy = this.particles[i].y - this.particles[j].y;
        const dist = Math.sqrt(dx * dx + dy * dy);
        
        if (dist < connectionDistance) {
          const opacity = (1 - dist / connectionDistance) * 0.3;
          this.ctx.strokeStyle = `rgba(29, 80, 126, ${opacity})`;
          
          this.ctx.beginPath();
          this.ctx.moveTo(this.particles[i].x, this.particles[i].y);
          this.ctx.lineTo(this.particles[j].x, this.particles[j].y);
          this.ctx.stroke();
        }
      }
    }
  }
  
  drawParticles() {
    this.particles.forEach(p => {
      // Glow effect
      if (this.config.glowEnabled) {
        const gradient = this.ctx.createRadialGradient(
          p.x, p.y, 0,
          p.x, p.y, p.size * 4
        );
        gradient.addColorStop(0, p.color.replace(/[\d.]+\)$/g, `${p.brightness})`));
        gradient.addColorStop(1, p.color.replace(/[\d.]+\)$/g, '0)'));
        
        this.ctx.fillStyle = gradient;
        this.ctx.beginPath();
        this.ctx.arc(p.x, p.y, p.size * 4, 0, Math.PI * 2);
        this.ctx.fill();
      }
      
      // Core particle
      this.ctx.fillStyle = p.color.replace(/[\d.]+\)$/g, `${p.brightness})`);
      this.ctx.beginPath();
      this.ctx.arc(p.x, p.y, p.size, 0, Math.PI * 2);
      this.ctx.fill();
    });
  }
  
  animate() {
    // Clear with black background
    this.ctx.fillStyle = '#000000';
    this.ctx.fillRect(0, 0, this.canvas.width, this.canvas.height);
    
    this.updateParticles();
    this.drawConnections();
    this.drawParticles();
    
    requestAnimationFrame(() => this.animate());
  }
}

// Auto-initialize when DOM is ready
if (document.readyState === 'loading') {
  document.addEventListener('DOMContentLoaded', () => {
    new QuantumField('quantumField');
  });
} else {
  new QuantumField('quantumField');
}

// Export for potential external use
if (typeof module !== 'undefined' && module.exports) {
  module.exports = QuantumField;
}