Ergonomic Chair Recommendations - Complete Guide

# Ergonomic Chair Features for Programming

class ErgonomicChairFeatures {
  constructor() {
    this.features = {
      lumbarSupport: {
        name: 'Lumbar Support',
        importance: 'Critical',
        description: 'Supports natural curve of lower back',
        types: ['Fixed', 'Adjustable', 'Dynamic'],
        recommendation: 'Adjustable or dynamic lumbar support'
      },
      
      seatHeight: {
        name: 'Seat Height Adjustment',
        importance: 'Critical',
        description: 'Allows feet to rest flat on floor',
        range: '16-21 inches (40-53 cm)',
        recommendation: 'Gas lift mechanism with wide range'
      },
      
      armrests: {
        name: 'Armrest Adjustability',
        importance: 'High',
        description: 'Supports arms and shoulders',
        types: ['Fixed', 'Height adjustable', '4D adjustable'],
        recommendation: '4D adjustable armrests'
      },
      
      backrest: {
        name: 'Backrest Adjustability',
        importance: 'High',
        description: 'Supports upper back and shoulders',
        types: ['Fixed', 'Tilt', 'Tilt with lock', 'Tilt with tension'],
        recommendation: 'Tilt with tension control'
      },
      
      seatDepth: {
        name: 'Seat Depth Adjustment',
        importance: 'Medium',
        description: 'Ensures proper thigh support',
        range: '15-17 inches (38-43 cm)',
        recommendation: 'Adjustable seat depth'
      },
      
      materials: {
        name: 'Breathable Materials',
        importance: 'Medium',
        description: 'Prevents heat buildup during long sessions',
        types: ['Mesh', 'Fabric', 'Leather', 'Hybrid'],
        recommendation: 'Mesh back with fabric seat'
      }
    };
  }
  
  evaluateChair(chair) {
    const evaluation = {
      ergonomicScore: this.calculateErgonomicScore(chair),
      comfortRating: this.assessComfort(chair),
      durabilityRating: this.assessDurability(chair),
      valueRating: this.assessValue(chair),
      programmingSuitability: this.assessProgrammingSuitability(chair)
    };
    
    return evaluation;
  }
  
  calculateErgonomicScore(chair) {
    let score = 0;
    const maxScore = 100;
    
    // Lumbar support (25 points)
    if (chair.lumbarSupport === 'adjustable') score += 25;
    else if (chair.lumbarSupport === 'fixed') score += 15;
    else if (chair.lumbarSupport === 'dynamic') score += 20;
    
    // Seat height adjustment (20 points)
    if (chair.seatHeightAdjustable) score += 20;
    
    // Armrest adjustability (20 points)
    if (chair.armrests === '4d') score += 20;
    else if (chair.armrests === 'height') score += 15;
    else if (chair.armrests === 'fixed') score += 5;
    
    // Backrest adjustability (15 points)
    if (chair.backrest === 'tilt_tension') score += 15;
    else if (chair.backrest === 'tilt_lock') score += 10;
    else if (chair.backrest === 'tilt') score += 8;
    
    // Seat depth adjustment (10 points)
    if (chair.seatDepthAdjustable) score += 10;
    
    // Breathable materials (10 points)
    if (chair.materials.includes('mesh')) score += 10;
    else if (chair.materials.includes('fabric')) score += 7;
    
    return {
      score: score,
      percentage: (score / maxScore) * 100,
      rating: score >= 80 ? 'Excellent' : 
              score >= 60 ? 'Good' : 
              score >= 40 ? 'Fair' : 'Poor'
    };
  }
  
  assessComfort(chair) {
    const comfortFactors = {
      cushioning: this.evaluateCushioning(chair),
      support: this.evaluateSupport(chair),
      materials: this.evaluateMaterials(chair),
      adjustability: this.evaluateAdjustability(chair)
    };
    
    const totalScore = Object.values(comfortFactors).reduce((sum, score) => sum + score, 0);
    const averageScore = totalScore / Object.keys(comfortFactors).length;
    
    return {
      score: averageScore,
      rating: averageScore >= 8 ? 'Excellent' : 
              averageScore >= 6 ? 'Good' : 
              averageScore >= 4 ? 'Fair' : 'Poor',
      factors: comfortFactors
    };
  }
  
  evaluateCushioning(chair) {
    // Cushioning quality assessment
    const cushioningTypes = {
      'high_density_foam': 9,
      'memory_foam': 8,
      'standard_foam': 6,
      'minimal_cushioning': 3
    };
    
    return cushioningTypes[chair.cushioning] || 5;
  }
  
  evaluateSupport(chair) {
    // Support quality assessment
    let supportScore = 0;
    
    if (chair.lumbarSupport === 'adjustable') supportScore += 3;
    if (chair.backrest === 'tilt_tension') supportScore += 2;
    if (chair.armrests === '4d') supportScore += 2;
    if (chair.seatDepthAdjustable) supportScore += 1;
    
    return Math.min(supportScore, 10);
  }
  
  evaluateMaterials(chair) {
    // Material quality assessment
    const materialScores = {
      'premium_mesh': 9,
      'high_quality_fabric': 8,
      'leather': 7,
      'standard_fabric': 6,
      'basic_materials': 4
    };
    
    return materialScores[chair.materialQuality] || 5;
  }
  
  evaluateAdjustability(chair) {
    // Adjustability assessment
    let adjustabilityScore = 0;
    
    const adjustments = [
      'seatHeight',
      'armrestHeight',
      'armrestWidth',
      'armrestDepth',
      'armrestAngle',
      'backrestTilt',
      'lumbarHeight',
      'lumbarDepth',
      'seatDepth'
    ];
    
    adjustments.forEach(adjustment => {
      if (chair[adjustment]) adjustabilityScore += 1;
    });
    
    return Math.min(adjustabilityScore, 10);
  }
  
  assessDurability(chair) {
    const durabilityFactors = {
      warranty: this.evaluateWarranty(chair),
      materials: this.evaluateMaterialDurability(chair),
      construction: this.evaluateConstruction(chair),
      brand: this.evaluateBrand(chair)
    };
    
    const totalScore = Object.values(durabilityFactors).reduce((sum, score) => sum + score, 0);
    const averageScore = totalScore / Object.keys(durabilityFactors).length;
    
    return {
      score: averageScore,
      rating: averageScore >= 8 ? 'Excellent' : 
              averageScore >= 6 ? 'Good' : 
              averageScore >= 4 ? 'Fair' : 'Poor',
      factors: durabilityFactors
    };
  }
  
  evaluateWarranty(chair) {
    // Warranty length assessment
    const warrantyYears = chair.warranty || 0;
    
    if (warrantyYears >= 12) return 10;
    if (warrantyYears >= 5) return 8;
    if (warrantyYears >= 3) return 6;
    if (warrantyYears >= 1) return 4;
    return 2;
  }
  
  evaluateMaterialDurability(chair) {
    // Material durability assessment
    const durabilityScores = {
      'aluminum_frame': 10,
      'steel_frame': 9,
      'plastic_frame': 6,
      'wood_frame': 7
    };
    
    return durabilityScores[chair.frameMaterial] || 5;
  }
  
  evaluateConstruction(chair) {
    // Construction quality assessment
    let constructionScore = 0;
    
    if (chair.gasLiftCertified) constructionScore += 3;
    if (chair.castorsCertified) constructionScore += 2;
    if (chair.mechanismsCertified) constructionScore += 3;
    if (chair.stabilityTested) constructionScore += 2;
    
    return constructionScore;
  }
  
  evaluateBrand(chair) {
    // Brand reputation assessment
    const brandScores = {
      'herman_miller': 10,
      'steelcase': 9,
      'humanscale': 8,
      'knoll': 8,
      'okamura': 7,
      'other_premium': 6,
      'mid_range': 4,
      'budget': 2
    };
    
    return brandScores[chair.brandTier] || 5;
  }
  
  assessProgrammingSuitability(chair) {
    const factors = {
      ergonomicScore: this.calculateErgonomicScore(chair).percentage / 10,
      comfortRating: this.assessComfort(chair).score,
      durabilityRating: this.assessDurability(chair).score,
      adjustability: this.evaluateAdjustability(chair),
      materials: this.evaluateMaterials(chair)
    };
    
    const totalScore = Object.values(factors).reduce((sum, score) => sum + score, 0);
    const averageScore = totalScore / Object.keys(factors).length;
    
    return {
      score: averageScore,
      rating: averageScore >= 8 ? 'Excellent for Programming' : 
              averageScore >= 6 ? 'Good for Programming' : 
              averageScore >= 4 ? 'Fair for Programming' : 'Not Recommended',
      factors: factors
    };
  }
}

class ChairRecommendations {
  constructor() {
    this.recommendations = {
      budget: {
        priceRange: '$100-300',
        chairs: [
          {
            name: 'IKEA Markus',
            price: '$199',
            features: ['Fixed lumbar support', 'Height adjustable', 'Tilt backrest'],
            pros: ['Good value', 'Simple design', 'Reliable'],
            cons: ['Limited adjustability', 'Fixed armrests', 'Basic materials']
          },
          {
            name: 'Staples Hyken',
            price: '$179',
            features: ['Mesh back', 'Height adjustable', 'Tilt lock'],
            pros: ['Breathable', 'Affordable', 'Good support'],
            cons: ['Limited warranty', 'Basic construction', 'Fixed armrests']
          }
        ]
      },
      
      midRange: {
        priceRange: '$300-800',
        chairs: [
          {
            name: 'Herman Miller Sayl',
            price: '$395',
            features: ['Dynamic lumbar support', '4D armrests', 'Tilt tension'],
            pros: ['Excellent ergonomics', 'Modern design', 'Good warranty'],
            cons: ['Higher price', 'Limited color options', 'Learning curve']
          },
          {
            name: 'Steelcase Series 1',
            price: '$399',
            features: ['Adjustable lumbar', 'Height adjustable armrests', 'Tilt tension'],
            pros: ['Durable construction', 'Good adjustability', 'Reliable'],
            cons: ['Basic materials', 'Limited customization', 'Heavy']
          }
        ]
      },
      
      premium: {
        priceRange: '$800+',
        chairs: [
          {
            name: 'Herman Miller Aeron',
            price: '$1,395',
            features: ['PostureFit SL', '4D armrests', 'Tilt limiter', 'Forward tilt'],
            pros: ['Industry standard', 'Excellent ergonomics', 'Durable', 'Resale value'],
            cons: ['High price', 'Learning curve', 'Limited customization']
          },
          {
            name: 'Steelcase Gesture',
            price: '$1,199',
            features: ['LiveBack technology', '4D armrests', 'Tilt tension', 'Forward tilt'],
            pros: ['Innovative design', 'Excellent adjustability', 'Modern technology'],
            cons: ['High price', 'Complex adjustments', 'Heavy']
          }
        ]
      }
    };
  }
  
  getRecommendation(budget, preferences) {
    const category = this.getCategoryByBudget(budget);
    const chairs = this.recommendations[category].chairs;
    
    return chairs.map(chair => {
      const evaluation = new ErgonomicChairFeatures().evaluateChair(chair);
      return {
        ...chair,
        evaluation: evaluation,
        suitability: evaluation.programmingSuitability.rating
      };
    }).sort((a, b) => b.evaluation.programmingSuitability.score - a.evaluation.programmingSuitability.score);
  }
  
  getCategoryByBudget(budget) {
    if (budget <= 300) return 'budget';
    if (budget <= 800) return 'midRange';
    return 'premium';
  }
}