Business Website: https://company.com
Product Page: https://shop.com/product/123
Social Media: https://instagram.com/username
Landing Page: https://campaign.com/summer-sale
App Download: https://app.store/download/appname

BEGIN:VCARD
VERSION:3.0
FN:John Doe
ORG:Company Inc.
TITLE:Marketing Director
TEL:+1-555-123-4567
EMAIL:john@company.com
URL:https://company.com
ADR:;;123 Business St;City;State;12345;Country
END:VCARD

Network Name: CompanyGuest
Password: SecurePass123
Security: WPA2/WPA3
Hidden Network: No

Generated String: WIFI:T:WPA;S:CompanyGuest;P:SecurePass123;H:false;;

Recipient: +1-555-123-4567
Message: "Thanks for visiting! Reply with your feedback."

Generated String: SMSTO:+15551234567:Thanks for visiting! Reply with your feedback.

To: support@company.com
Subject: Product Inquiry
Body: I'm interested in learning more about your services.

Generated String: mailto:support@company.com?subject=Product%20Inquiry&body=I%27m%20interested%20in%20learning%20more%20about%20your%20services.

✓ Scan with multiple smartphone cameras
✓ Test different lighting conditions
✓ Verify all information is correct
✓ Check destination links work properly
✓ Test on both iOS and Android devices

Corporate Blue:
- Foreground: #003366 (Dark Blue)
- Background: #FFFFFF (White)

Modern Minimalist:
- Foreground: #2D3748 (Dark Gray)
- Background: #F7FAFC (Light Gray)

High Contrast (Best Readability):
- Foreground: #000000 (Black)
- Background: #FFFFFF (White)

Brand Matching:
- Use your brand's primary color
- Ensure sufficient contrast (4.5:1 minimum)

// Good contrast ratios
const colorCombinations = {
  excellent: { ratio: "7:1+", description: "Perfect for all uses" },
  good: { ratio: "4.5:1+", description: "Suitable for most applications" },
  poor: { ratio: "3:1-", description: "May cause scanning issues" }
};

// Test your colors
const testContrast = (foreground, background) => {
  // Use online contrast checkers or built-in tool
  return calculateContrastRatio(foreground, background);
};

Size Guidelines:
- Logo should be 10-30% of total QR code area
- Maintain square aspect ratio when possible
- Ensure logo doesn't cover critical positioning markers

Positioning:
- Center placement is most common
- Corner placement for subtle branding
- Consider error correction level when adding logos

File Formats:
- PNG with transparent background (preferred)
- SVG for scalable logos
- JPEG for photographic logos

const logoSettings = {
  size: "20%", // Percentage of QR code size
  position: "center", // center, top-left, top-right, etc.
  shape: "square", // square, circle, rounded
  background: "white", // Background color behind logo
  border: "2px", // Border around logo
  opacity: 1.0 // Logo transparency
};

L (Low) - 7% correction:
✓ Clean environments
✓ Digital displays
✓ Short-term use
✗ Not suitable with logos

M (Medium) - 15% correction:
✓ General purpose use
✓ Print materials
✓ Small logos possible
✓ Most common choice

Q (Quartile) - 25% correction:
✓ Industrial environments
✓ Medium-sized logos
✓ Outdoor applications
✓ Long-term durability

H (High) - 30% correction:
✓ Harsh conditions
✓ Large logos
✓ Maximum durability
✗ Larger QR code size

Type,Content,Name,Color_Foreground,Color_Background
URL,https://company.com/product1,Product 1,#000000,#FFFFFF
URL,https://company.com/product2,Product 2,#000000,#FFFFFF
Contact,"John Doe;Company Inc.;+1-555-123-4567;john@company.com",John Contact,#003366,#FFFFFF
WiFi,"WIFI:T:WPA;S:CompanyWiFi;P:password123;;",Office WiFi,#000000,#FFFFFF

const processBatch = (csvData) => {
  const qrCodes = csvData.map((row, index) => {
    return {
      id: index,
      type: row.Type,
      content: row.Content,
      name: row.Name || `QR_${index}`,
      colors: {
        foreground: row.Color_Foreground || '#000000',
        background: row.Color_Background || '#FFFFFF'
      }
    };
  });
  
  return generateMultipleQRCodes(qrCodes);
};

// Create trackable, editable QR codes
const createDynamicQR = async (originalURL, campaign) => {
  const shortURL = await createShortURL({
    originalURL: originalURL,
    campaign: campaign,
    analytics: true,
    editable: true
  });
  
  return generateQRCode({
    content: shortURL,
    trackingEnabled: true,
    campaignInfo: campaign
  });
};

✓ Change destination without reprinting
✓ Track scan analytics and demographics
✓ A/B test different destinations
✓ Set expiration dates
✓ Password protect access
✓ Geographic restrictions

const qrTemplates = {
  businessCard: {
    type: "contact",
    errorCorrection: "M",
    size: 300,
    colors: { fg: "#2D3748", bg: "#FFFFFF" },
    logo: { enabled: true, size: "20%" }
  },
  
  marketing: {
    type: "url",
    errorCorrection: "L",
    size: 400,
    colors: { fg: "#E53E3E", bg: "#FFFFFF" },
    logo: { enabled: true, size: "25%" }
  },
  
  restaurant: {
    type: "url", // Menu or ordering system
    errorCorrection: "M",
    size: 250,
    colors: { fg: "#2F855A", bg: "#FFFFFF" },
    style: "rounded"
  }
};

const addTracking = (baseURL, campaign) => {
  const url = new URL(baseURL);
  
  url.searchParams.set('utm_source', 'qr_code');
  url.searchParams.set('utm_medium', 'offline');
  url.searchParams.set('utm_campaign', campaign.name);
  url.searchParams.set('utm_term', campaign.location);
  url.searchParams.set('utm_content', campaign.variation);
  
  return url.toString();
};

// Example usage
const trackedURL = addTracking(
  'https://company.com/product',
  {
    name: 'summer_sale_2025',
    location: 'poster_downtown',
    variation: 'qr_v1'
  }
);

Minimum Sizes by Distance:
- Business card: 0.8 inches (2cm)
- Poster/Flyer: 1.2 inches (3cm) 
- Billboard: 3+ inches (8cm+)
- Digital screen: Depends on viewing distance

Print Resolution:
- 300 DPI for professional print
- 150 DPI for general print
- 72 DPI for digital displays only

Contrast Requirements:
✓ Minimum 4.5:1 contrast ratio
✓ Test in grayscale
✓ Consider color-blind accessibility
✓ Avoid light colors on light backgrounds

Color Guidelines:
✓ Dark foreground, light background preferred
✓ Use brand colors strategically
✓ Test under different lighting
✓ Consider print color shifts

// Good URL structure
const optimizedURL = {
  original: "https://verylongcompanyname.com/products/category/subcategory/item123?ref=qrcode&utm_campaign=summer",
  optimized: "https://short.ly/summer-deal", // Redirects to full URL
  benefits: [
    "Shorter QR code (less complex)",
    "Better error correction",
    "Easier to type manually if needed",
    "Analytics tracking possible"
  ]
};

Text Content:
✓ Keep under 300 characters when possible
✓ Use clear, actionable language
✓ Include call-to-action context
✗ Avoid special characters that may cause issues

Contact Information:
✓ Include essential information only
✓ Use standard phone number formats
✓ Verify email addresses work
✓ Test vCard import on multiple devices

Optimal Locations:
✓ Eye level (4-6 feet high)
✓ Good lighting conditions
✓ Stable surfaces (avoid movement)
✓ Easily accessible to smartphones

Avoid These Locations:
✗ Behind glass with glare
✗ Curved or uneven surfaces
✗ Areas with poor lighting
✗ Moving objects (vehicles, etc.)

Website Integration:
✓ Above the fold on mobile
✓ Near call-to-action buttons
✓ Contact or about pages
✓ Download or app promotion sections

Social Media:
✓ Instagram stories and posts
✓ LinkedIn business profiles
✓ Facebook event pages
✓ Twitter profile headers

// Multi-channel QR campaign
const marketingCampaign = {
  name: "Summer Sale 2025",
  channels: [
    {
      medium: "print_poster",
      qrContent: "https://shop.com/summer-sale?source=poster",
      placement: "Downtown shopping district",
      expectedScans: 500
    },
    {
      medium: "business_card", 
      qrContent: "https://company.com/contact?source=card",
      placement: "Trade show networking",
      expectedScans: 200
    },
    {
      medium: "product_packaging",
      qrContent: "https://company.com/warranty?product=123",
      placement: "Product boxes",
      expectedScans: 1000
    }
  ]
};

// Analytics dashboard data
const campaignMetrics = {
  totalScans: 1850,
  uniqueUsers: 1423,
  conversionRate: 12.5,
  topPerformingLocation: "Downtown poster",
  peakScanTime: "Tuesday 2-4 PM",
  deviceBreakdown: {
    iOS: 65,
    Android: 35
  },
  locationData: {
    city: "Major metropolitan area",
    demographics: "25-45 age group primary"
  }
};

const restaurantQR = {
  menuTypes: {
    dineIn: {
      url: "https://restaurant.com/menu/dine-in",
      features: ["Full menu", "Allergen info", "Nutritional data"]
    },
    takeout: {
      url: "https://restaurant.com/menu/takeout", 
      features: ["Ordering system", "Pickup times", "Payment integration"]
    },
    delivery: {
      url: "https://restaurant.com/menu/delivery",
      features: ["Delivery zones", "Minimum orders", "Tracking"]
    }
  },
  
  placement: [
    "Table tents (individual QR codes)",
    "Wall posters (large, high contrast)",
    "Receipt integration",
    "Window displays for takeout"
  ]
};

const eventQR = {
  schedule: {
    content: "https://event.com/schedule",
    placement: "Registration desks, program booklets"
  },
  
  networking: {
    content: "BEGIN:VCARD\nFN:Event Organizer\nORG:Conference Inc.\nTEL:+1-555-EVENT\nEMAIL:contact@event.com\nEND:VCARD",
    placement: "Badge holders, business card alternatives"
  },
  
  feedback: {
    content: "https://event.com/feedback?session=keynote-1",
    placement: "Session rooms, presentation slides"
  },
  
  resources: {
    content: "https://event.com/resources/downloads",
    placement: "Information booths, handout materials"
  }
};

const realEstateQR = {
  propertyListing: {
    content: "https://realty.com/property/123-main-st",
    includes: [
      "Virtual tour links",
      "Photo galleries", 
      "Pricing information",
      "Agent contact details",
      "Mortgage calculators",
      "Neighborhood information"
    ],
    placement: [
      "For sale signs",
      "Property flyers", 
      "Open house materials",
      "Business cards",
      "Advertisement placements"
    ]
  }
};

Standard: ISO/IEC 18004:2015
Character Capacity (Version 40):
- Numeric: 7,089 characters
- Alphanumeric: 4,296 characters  
- Binary: 2,953 bytes
- Kanji: 1,817 characters

Error Correction Codes:
- Reed-Solomon error correction
- 4 levels: L(7%), M(15%), Q(25%), H(30%)

const qrVersions = {
  1: { modules: "21x21", numericCapacity: 41 },
  10: { modules: "57x57", numericCapacity: 1273 },
  20: { modules: "97x97", numericCapacity: 3057 },
  30: { modules: "137x137", numericCapacity: 5156 },
  40: { modules: "177x177", numericCapacity: 7089 }
};

// Version selection based on content
const selectVersion = (content, errorLevel) => {
  const requiredCapacity = calculateRequiredCapacity(content);
  return findMinimumVersion(requiredCapacity, errorLevel);
};

const pngSpecs = {
  colorDepth: "24-bit RGB or 8-bit grayscale",
  compression: "Lossless PNG compression",
  resolution: "72-300 DPI",
  maxSize: "2000x2000 pixels",
  transparency: "Alpha channel support",
  embedding: "Color profile and metadata support"
};

const scanningSpecs = {
  minimumResolution: "640x480 pixels",
  focusDistance: "4-24 inches optimal",
  lightingConditions: "300+ lux recommended",
  angleRange: "±45 degrees from perpendicular",
  
  cameraRequirements: {
    autofocus: "Recommended for close scanning",
    resolution: "2MP+ for reliable scanning",
    stabilization: "Helpful for handheld scanning"
  },
  
  processingTime: {
    simple: "0.1-0.5 seconds",
    complex: "0.5-2.0 seconds",
    withLogo: "0.2-1.0 seconds"
  }
};

// Scanning checklist
const scanningTroubleshooting = {
  contrast: "Ensure sufficient contrast (min 4.5:1)",
  size: "Check minimum size requirements for distance",
  lighting: "Improve lighting conditions",
  focus: "Allow camera time to autofocus",
  angle: "Hold phone perpendicular to QR code",
  stability: "Keep phone steady while scanning",
  
  technicalFixes: {
    errorCorrection: "Increase to level M or Q",
    quietZone: "Ensure adequate white border",
    logoSize: "Reduce logo size if present",
    complexity: "Reduce data content if possible"
  }
};

const printOptimization = {
  resolution: "Use 300 DPI minimum for print",
  format: "Use SVG for scalability or high-res PNG",
  size: "Generate larger than needed, then scale down",
  colors: "Use pure black/white for maximum contrast",
  
  printerSettings: {
    colorMode: "Use grayscale or black & white mode",
    quality: "Set to highest quality setting",
    paperType: "Use white, non-glossy paper when possible"
  }
};

const logoOptimization = {
  size: "Keep logo under 20% of QR code area",
  placement: "Center placement usually works best",
  errorCorrection: "Use level Q (25%) or H (30%)",
  background: "Add white background behind logo",
  contrast: "Ensure logo doesn't blend with QR pattern",
  
  testingSteps: [
    "Test without logo first",
    "Gradually increase logo size",
    "Test with multiple devices",
    "Check different lighting conditions"
  ]
};

const encodingFixes = {
  characterSet: "Use UTF-8 encoding for all content",
  specialChars: "Test with common special characters",
  urlEncoding: "Properly encode URLs with spaces/symbols",
  vCardFormat: "Follow vCard 3.0 standard strictly",
  
  testingContent: [
    "ASCII characters only (safest)",
    "Common international characters",
    "Special symbols and punctuation",
    "Long URLs and text content"
  ]
};

const compatibilityTesting = {
  nativeCamera: "Test with built-in camera apps (iOS/Android)",
  thirdPartyApps: "Test with popular QR scanner apps",
  socialApps: "Test with Instagram, Snapchat, WeChat",
  browserApps: "Test with Chrome, Safari camera features",
  
  commonIssues: {
    dataTypes: "Some apps don't support all data types",
    formatting: "Strict formatting requirements",
    urlSchemes: "Custom URL schemes may not work",
    encoding: "Character encoding differences"
  }
};