Bulk CSV Phone Validation: Complete Enterprise Guide 2025

// Enterprise Bulk CSV Phone Validation Implementation
class BulkPhoneValidator {
  constructor(apiKey) {
    this.apiKey = apiKey;
    this.batchSize = 1000; // Optimal for performance
    this.maxConcurrent = 5; // Concurrent processing limit
  }

  async validateCSVFile(filePath, options = {}) {
    try {
      // Step 1: Parse CSV file
      const records = await this.parseCSV(filePath);
      console.log(`Processing ${records.length} phone records...`);

      // Step 2: Batch processing for large files
      const batches = this.createBatches(records, this.batchSize);
      const results = [];

      for (const batch of batches) {
        const batchResults = await this.processBatch(batch, options);
        results.push(...batchResults);

        // Progress tracking
        const progress = (results.length / records.length) * 100;
        console.log(`Validation progress: ${progress.toFixed(1)}%`);
      }

      // Step 3: Generate comprehensive report
      const report = this.generateValidationReport(results);

      // Step 4: Export cleaned data
      const cleanData = this.exportCleanData(results);

      return {
        summary: report,
        cleanedData: cleanData,
        statistics: this.calculateStatistics(results)
      };

    } catch (error) {
      throw new Error(`Bulk validation failed: ${error.message}`);
    }
  }

  async processBatch(phoneNumbers, options) {
    const validationPromises = phoneNumbers.map(async (record) => {
      try {
        const validation = await phoneCheckAPI.validate({
          phone: record.phone_number,
          country: record.country_code || 'US',
          includeCarrierInfo: options.includeCarrier || true,
          checkLineType: options.checkLineType || true,
          riskScoring: options.riskScoring || false,
          timeout: 5000
        });

        return {
          originalRecord: record,
          validation: validation,
          status: this.determineStatus(validation),
          recommendations: this.generateRecommendations(validation, record)
        };
      } catch (error) {
        return {
          originalRecord: record,
          error: error.message,
          status: 'ERROR'
        };
      }
    });

    return Promise.all(validationPromises);
  }

  determineStatus(validation) {
    if (!validation.isValid) return 'INVALID';
    if (validation.lineType === 'LANDLINE') return 'LANDLINE';
    if (validation.lineType === 'VOIP' && validation.riskScore > 0.7) return 'HIGH_RISK_VOIP';
    if (validation.lineType === 'MOBILE' && validation.isActive) return 'VALID_MOBILE';
    return 'REVIEW_NEEDED';
  }

  generateValidationReport(results) {
    const stats = {
      total: results.length,
      validMobile: 0,
      invalid: 0,
      landline: 0,
      voip: 0,
      highRisk: 0,
      errors: 0
    };

    results.forEach(result => {
      switch (result.status) {
        case 'VALID_MOBILE': stats.validMobile++; break;
        case 'INVALID': stats.invalid++; break;
        case 'LANDLINE': stats.landline++; break;
        case 'HIGH_RISK_VOIP': stats.voip++; stats.highRisk++; break;
        case 'ERROR': stats.errors++; break;
        default: break;
      }
    });

    return {
      ...stats,
      validPercentage: ((stats.validMobile / stats.total) * 100).toFixed(1),
      invalidPercentage: ((stats.invalid / stats.total) * 100).toFixed(1),
      landlinePercentage: ((stats.landline / stats.total) * 100).toFixed(1),
      estimatedSavings: this.calculateSavings(stats)
    };
  }

  exportCleanData(results, format = 'csv') {
    const cleanRecords = results
      .filter(result => result.status === 'VALID_MOBILE')
      .map(result => ({
        ...result.originalRecord,
        phone_validated: result.validation.phone,
        carrier: result.validation.carrier,
        country: result.validation.country,
        line_type: result.validation.lineType,
        validation_date: new Date().toISOString(),
        risk_score: result.validation.riskScore || 0
      }));

    if (format === 'csv') {
      return this.generateCSV(cleanRecords);
    } else if (format === 'json') {
      return JSON.stringify(cleanRecords, null, 2);
    }

    return cleanRecords;
  }

  calculateSavings(stats) {
    // Based on industry averages
    const smsCostPerMessage = 0.03;
    const monthlySmsVolume = 100000; // Enterprise average

    const currentWaste = (stats.invalid + stats.landline) / stats.total;
    const monthlySavings = monthlySmsVolume * currentWaste * smsCostPerMessage;

    return {
      monthly: monthlySavings.toFixed(2),
      annual: (monthlySavings * 12).toFixed(2),
      percentageReduction: (currentWaste * 100).toFixed(1)
    };
  }
}