/**
 * Quantum Transition Animations
 * Provides dynamic transitions and particle effects for the Quantum NLP Framework
 */

// Wait for document to be fully loaded
document.addEventListener('DOMContentLoaded', function() {
  // Initialize animations when page loads
  initQuantumAnimations();
  
  // Add event listener for analyze button to trigger animations
  const analyzeBtn = document.getElementById('analyze-btn');
  if (analyzeBtn) {
    analyzeBtn.addEventListener('click', function() {
      // Only trigger animation if form is valid
      const form = document.getElementById('process-form');
      if (form.checkValidity()) {
        showQuantumTransition();
      }
    });
    
    // Enhanced button effects
    analyzeBtn.addEventListener('mouseover', function() {
      triggerSmallParticleEffect(this);
    });
  }
  
  // Initialize text-to-vision transitions
  initTextToVisionTransitions();
  
  // Check if results are present and apply animations
  const resultsContainer = document.getElementById('results-container');
  if (resultsContainer && resultsContainer.children.length > 0) {
    applyResultsAnimations(resultsContainer);
  }
});

/**
 * Initialize text-to-vision transitions with staggered timing
 */
function initTextToVisionTransitions() {
  const visionElements = document.querySelectorAll('.text-to-vision');
  visionElements.forEach((elem, index) => {
    // Add a staggered delay for smoother visual effect
    const delay = 300 + (index * 150);
    setTimeout(() => {
      elem.classList.add('text-to-vision-active');
      
      // Reset the animation after it completes to allow replaying
      setTimeout(() => {
        elem.classList.remove('text-to-vision-active');
      }, 1500);
    }, delay);
  });
}

/**
 * Apply animations to results container
 */
function applyResultsAnimations(container) {
  // Add entrance animation
  container.style.opacity = '0';
  container.style.transform = 'translateY(20px)';
  
  setTimeout(() => {
    container.style.transition = 'opacity 0.5s ease, transform 0.5s ease';
    container.style.opacity = '1';
    container.style.transform = 'translateY(0)';
    
    // Apply smoke dispersion effect to each card
    const cards = container.querySelectorAll('.quantum-card');
    cards.forEach((card, index) => {
      setTimeout(() => {
        card.classList.add('quantum-reveal');
      }, 300 + (index * 150));
    });
  }, 200);
}

/**
 * Trigger a small particle effect around an element
 */
function triggerSmallParticleEffect(element) {
  // Create a few particles around the button
  const rect = element.getBoundingClientRect();
  const centerX = rect.left + rect.width / 2;
  const centerY = rect.top + rect.height / 2;
  
  // Create 5-10 particles
  const count = Math.floor(Math.random() * 5) + 5;
  for (let i = 0; i < count; i++) {
    const particle = document.createElement('div');
    particle.className = 'quantum-particle';
    
    // Random position around the element
    const angle = Math.random() * Math.PI * 2;
    const distance = Math.random() * 20 + 10;
    const x = centerX + Math.cos(angle) * distance;
    const y = centerY + Math.sin(angle) * distance;
    
    // Random size
    const size = Math.random() * 4 + 2;
    
    // Set styles
    particle.style.left = x + 'px';
    particle.style.top = y + 'px';
    particle.style.width = size + 'px';
    particle.style.height = size + 'px';
    particle.style.backgroundColor = getQuantumParticleColor();
    
    // Add to body
    document.body.appendChild(particle);
    
    // Animate and remove
    setTimeout(() => {
      particle.remove();
    }, 1000);
  }
}

/**
 * Initialize all quantum animations and effects
 */
function initQuantumAnimations() {
  // Create canvas for particle effects
  createParticleCanvas();
  
  // Pre-load any assets needed for animations
  preloadAnimationAssets();
}

/**
 * Create canvas for particle animations
 */
function createParticleCanvas() {
  const canvas = document.createElement('canvas');
  canvas.id = 'quantum-particles';
  canvas.className = 'particle-canvas';
  canvas.width = window.innerWidth;
  canvas.height = window.innerHeight;
  
  // Add canvas to the body but keep it hidden initially
  canvas.style.display = 'none';
  canvas.style.position = 'fixed';
  canvas.style.top = 0;
  canvas.style.left = 0;
  canvas.style.pointerEvents = 'none';
  canvas.style.zIndex = 1000;
  document.body.appendChild(canvas);
  
  // Handle window resize
  window.addEventListener('resize', function() {
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;
  });
}

/**
 * Preload any assets needed for animations
 */
function preloadAnimationAssets() {
  // Add any image preloading here if needed
}

/**
 * Show the quantum transition animation when analyzing text
 */
function showQuantumTransition() {
  // Get input and display areas
  const inputArea = document.querySelector('.card-body:has(#input_text)');
  const resultsArea = document.querySelector('#results-container');
  
  // Show loading overlay
  showLoadingOverlay();
  
  // Show particle effects
  triggerParticleEffect();
  
  // The actual form submission happens normally, but we add visual effects
}

/**
 * Show a quantum-themed loading overlay
 */
function showLoadingOverlay() {
  // Create overlay if it doesn't exist
  let overlay = document.getElementById('quantum-overlay');
  
  if (!overlay) {
    overlay = document.createElement('div');
    overlay.id = 'quantum-overlay';
    overlay.innerHTML = `
      <div class="quantum-loader">
        <div class="quantum-spinner">
          <div class="q-orbit q-orbit-1"></div>
          <div class="q-orbit q-orbit-2"></div>
          <div class="q-orbit q-orbit-3"></div>
          <div class="q-core"></div>
        </div>
        <div class="quantum-message">Quantum Processing</div>
      </div>
    `;
    document.body.appendChild(overlay);
  }
  
  // Show the overlay with animation
  overlay.style.display = 'flex';
  setTimeout(() => {
    overlay.classList.add('active');
  }, 10);
}

/**
 * Hide the quantum loading overlay
 */
function hideLoadingOverlay() {
  const overlay = document.getElementById('quantum-overlay');
  if (overlay) {
    overlay.classList.remove('active');
    setTimeout(() => {
      overlay.style.display = 'none';
    }, 500);
  }
}

/**
 * Trigger the particle whirlwind effect
 */
function triggerParticleEffect() {
  const canvas = document.getElementById('quantum-particles');
  if (!canvas) return;
  
  // Show canvas with fade-in
  canvas.style.display = 'block';
  setTimeout(() => {
    canvas.classList.add('active');
  }, 10);
  
  // Get canvas context
  const ctx = canvas.getContext('2d');
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  
  // Create particles for the whirlwind effect
  const particles = [];
  const particleCount = 150;
  
  // Initialize particles
  for (let i = 0; i < particleCount; i++) {
    particles.push({
      x: canvas.width / 2,
      y: canvas.height / 2,
      size: Math.random() * 5 + 1,
      color: getQuantumParticleColor(),
      speedX: (Math.random() - 0.5) * 10,
      speedY: (Math.random() - 0.5) * 10,
      rotationRadius: Math.random() * 100 + 50,
      rotationSpeed: Math.random() * 0.1 + 0.02,
      rotationAngle: Math.random() * Math.PI * 2,
      opacity: Math.random() * 0.7 + 0.3,
      fadeSpeed: Math.random() * 0.02 + 0.005
    });
  }
  
  // Animation variables
  let frame = 0;
  const maxFrames = 120;
  
  // Animate particles
  function animateParticles() {
    // Clear canvas
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    
    // Update and draw particles
    for (let i = 0; i < particles.length; i++) {
      const p = particles[i];
      
      // Update rotation angle
      p.rotationAngle += p.rotationSpeed;
      
      // Calculate position with spiral effect
      const spiralFactor = 1 + (frame / maxFrames) * 3;
      const rotRadius = p.rotationRadius * (1 - frame / maxFrames);
      
      p.x = canvas.width / 2 + Math.cos(p.rotationAngle) * rotRadius * spiralFactor;
      p.y = canvas.height / 2 + Math.sin(p.rotationAngle) * rotRadius;
      
      // Add dispersion effect in later frames
      if (frame > maxFrames * 0.7) {
        p.x += p.speedX;
        p.y += p.speedY;
        p.opacity -= p.fadeSpeed;
      }
      
      // Draw particle
      ctx.globalAlpha = Math.max(0, p.opacity);
      ctx.fillStyle = p.color;
      ctx.beginPath();
      ctx.arc(p.x, p.y, p.size, 0, Math.PI * 2);
      ctx.fill();
    }
    
    // Increment frame
    frame++;
    
    // Continue animation or clean up
    if (frame <= maxFrames) {
      requestAnimationFrame(animateParticles);
    } else {
      // End animation with fade-out
      canvas.classList.remove('active');
      
      // After fade-out, hide the canvas completely
      setTimeout(() => {
        canvas.style.display = 'none';
        ctx.clearRect(0, 0, canvas.width, canvas.height);
      }, 300);
    }
  }
  
  // Start animation
  animateParticles();
  
  // Set timeout to match form submission time
  setTimeout(function() {
    hideLoadingOverlay();
    
    // Add reveal animation to results when they load
    const resultElements = document.querySelectorAll('.card');
    resultElements.forEach((el, index) => {
      if (el.closest('#results-container')) {
        // Add a staggered delay for each card
        setTimeout(() => {
          el.classList.add('quantum-reveal');
        }, index * 150);
      }
    });
  }, 2000); // Adjust timing as needed to match server response time
}

/**
 * Get a color for quantum particles
 */
function getQuantumParticleColor() {
  const colors = [
    '#4285F4', // Blue
    '#0F9D58', // Green
    '#DB4437', // Red
    '#F4B400', // Yellow
    '#9C27B0', // Purple
    '#00BCD4', // Cyan
    '#3F51B5'  // Indigo
  ];
  return colors[Math.floor(Math.random() * colors.length)];
}

/**
 * Apply visualization effect to quantum results
 */
function visualizeQuantumResults() {
  const quantumScoreEl = document.querySelector('.quantum-score');
  if (quantumScoreEl) {
    // Get the quantum score
    const score = parseFloat(quantumScoreEl.textContent);
    
    // Create a visualization canvas for the score
    createQuantumScoreVisualization(quantumScoreEl, score);
    
    // Apply visualization to the entire container
    const container = document.querySelector('.quantum-visualized');
    if (container) {
      applyQuantumVisualization(container, score);
    }
  }
}

/**
 * Create a visualization for the quantum score
 */
function createQuantumScoreVisualization(element, score) {
  // Add special particle effects around the score
  const parentEl = element.closest('.text-end');
  if (!parentEl) return;
  
  // Create a canvas for the visualization
  const canvas = document.createElement('canvas');
  canvas.className = 'quantum-score-canvas';
  canvas.width = 200;
  canvas.height = 100;
  canvas.style.position = 'absolute';
  canvas.style.top = '0';
  canvas.style.right = '0';
  canvas.style.pointerEvents = 'none';
  canvas.style.zIndex = '1';
  
  // Insert canvas
  parentEl.style.position = 'relative';
  parentEl.appendChild(canvas);
  
  // Create particles
  const ctx = canvas.getContext('2d');
  const particles = [];
  const particleCount = Math.round(score * 50); // More particles for higher scores
  
  // Create particles based on score
  for (let i = 0; i < particleCount; i++) {
    particles.push({
      x: canvas.width * 0.75,
      y: canvas.height * 0.5,
      size: Math.random() * 3 + 1,
      color: getScoreColor(score),
      speedX: (Math.random() - 0.5) * 2,
      speedY: (Math.random() - 0.5) * 2,
      opacity: Math.random() * 0.5 + 0.3,
      life: Math.random() * 100 + 50
    });
  }
  
  // Animate particles
  function animate() {
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    
    let remainingParticles = 0;
    
    for (let i = 0; i < particles.length; i++) {
      const p = particles[i];
      
      if (p.life > 0) {
        p.x += p.speedX;
        p.y += p.speedY;
        p.opacity = Math.max(0, p.opacity - 0.005);
        p.life--;
        
        ctx.globalAlpha = p.opacity;
        ctx.fillStyle = p.color;
        ctx.beginPath();
        ctx.arc(p.x, p.y, p.size, 0, Math.PI * 2);
        ctx.fill();
        
        remainingParticles++;
      }
    }
    
    if (remainingParticles > 0) {
      requestAnimationFrame(animate);
    }
  }
  
  // Start animation
  animate();
}

/**
 * Apply quantum visualization to an element
 */
function applyQuantumVisualization(element, score) {
  // Add the visualized class
  element.classList.add('quantum-visualized');
  
  // Create dynamic quantum effect based on score
  const intensity = score || 0.5;
  
  // Add a pulsing background effect
  element.style.setProperty('--quantum-pulse-intensity', intensity);
  
  // Create tumbleweed whirlwind effect
  createTumbleweeds(element, Math.round(intensity * 10));
}

/**
 * Create tumbleweed whirlwind particles inside an element
 */
function createTumbleweeds(element, count) {
  for (let i = 0; i < count; i++) {
    const tumbleweed = document.createElement('div');
    tumbleweed.className = 'tumbleweed';
    
    // Random position within the element
    const rect = element.getBoundingClientRect();
    const x = Math.random() * rect.width;
    const y = Math.random() * rect.height;
    
    // Random size
    const size = Math.random() * 20 + 10;
    
    // Set styles
    tumbleweed.style.left = x + 'px';
    tumbleweed.style.top = y + 'px';
    tumbleweed.style.width = size + 'px';
    tumbleweed.style.height = size + 'px';
    
    // Add to the element
    element.appendChild(tumbleweed);
    
    // Animate the tumbleweed
    animateTumbleweed(tumbleweed, rect);
  }
}

/**
 * Animate a tumbleweed particle
 */
function animateTumbleweed(element, containerRect) {
  const duration = Math.random() * 8000 + 4000; // 4-12 seconds
  let startTime = null;
  
  // The animation function
  function animate(timestamp) {
    if (!startTime) startTime = timestamp;
    const elapsed = timestamp - startTime;
    const progress = Math.min(elapsed / duration, 1);
    
    // Spiral motion
    const angle = progress * Math.PI * 6; // 3 full rotations
    const radius = progress * 100; // Expand outward
    const centerX = containerRect.width / 2;
    const centerY = containerRect.height / 2;
    
    const x = centerX + Math.cos(angle) * radius;
    const y = centerY + Math.sin(angle) * radius;
    
    // Apply position
    element.style.transform = `translate(${x}px, ${y}px) rotate(${angle * 180 / Math.PI}deg)`;
    
    // Fade out towards the end
    if (progress > 0.7) {
      element.style.opacity = 1 - ((progress - 0.7) / 0.3);
    }
    
    // Continue animation if not complete
    if (progress < 1) {
      requestAnimationFrame(animate);
    } else {
      // Remove element when animation completes
      element.remove();
    }
  }
  
  // Start the animation
  requestAnimationFrame(animate);
}

/**
 * Get color based on score value
 */
function getScoreColor(score) {
  if (score < 0.3) return '#dc3545'; // Low - red
  if (score < 0.6) return '#ffc107'; // Medium - yellow
  if (score < 0.8) return '#0dcaf0'; // Good - cyan
  return '#198754'; // High - green
}