Custom Schema Design

interface SchemaDesignPrinciples {
  // 1. Field Types and Constraints
  fieldTypes: {
    // Primitive types for different data categories
    identifiers: 'string' | 'address';     // IDs, addresses, references
    quantities: 'uint8' | 'uint16' | 'uint32' | 'uint64'; // Numbers, amounts, counts
    flags: 'bool';                         // Boolean states
    metadata: 'string' | 'bytes';         // Flexible data storage
    timestamps: 'uint64';                 // Time-based data
  };
  
  // 2. Naming Conventions
  namingRules: {
    descriptive: true;    // Use clear, self-documenting field names
    consistent: true;     // Follow consistent naming patterns
    versioned: true;      // Include version information
    namespaced: true;     // Use prefixes for related fields
  };
  
  // 3. Data Minimization
  dataStrategy: {
    onChain: 'essential_only';      // Only critical data on-chain
    offChain: 'detailed_records';   // Comprehensive data off-chain
    hashed: 'sensitive_data';       // Hash sensitive information
  };
  
  // 4. Evolution Strategy
  compatibility: {
    backward: true;       // Support older versions
    forward: true;        // Plan for future extensions
    migration: true;      // Define upgrade paths
  };
}

// Identity and Reference Fields
const identityFields = {
  userId: 'string',           // User identifiers
  walletAddress: 'address',   // Blockchain addresses
  sessionId: 'string',        // Process references
  externalId: 'string'        // Third-party system IDs
};

// Quantitative Fields
const quantitativeFields = {
  score: 'uint8',             // Scores (0-255)
  count: 'uint16',            // Counts (0-65535)
  amount: 'uint32',           // Amounts (0-4B)
  timestamp: 'uint64',        // Unix timestamps
  duration: 'uint32'          // Time periods in seconds
};

// Categorical Fields
const categoricalFields = {
  verified: 'bool',           // Boolean states
  status: 'string',           // Enumerated states
  level: 'string',            // Tier/level indicators
  type: 'string'              // Category classifications
};

// Metadata Fields
const metadataFields = {
  notes: 'string',            // Text descriptions
  tags: 'string',             // Comma-separated tags
  dataHash: 'bytes',          // Content hashes
  signature: 'bytes'          // Cryptographic signatures
};

import { StellarAttestSDK, SolanaAttestSDK } from '@attestprotocol/sdk';

class ComplianceSchemaManager {
  private sdk: StellarAttestSDK | SolanaAttestSDK;
  private schemaRegistry: Map<string, SchemaDefinition> = new Map();
  
  constructor(sdk: StellarAttestSDK | SolanaAttestSDK) {
    this.sdk = sdk;
  }

  async createComplianceSchemas(): Promise<Map<string, string>> {
    const schemas = new Map<string, string>();
    
    // Create all compliance schemas in parallel
    const [amlSchema, soxSchema, gdprSchema] = await Promise.all([
      this.createAMLSchema(),
      this.createSOXSchema(),
      this.createGDPRSchema()
    ]);
    
    schemas.set('aml-screening', amlSchema);
    schemas.set('sox-compliance', soxSchema);
    schemas.set('gdpr-processing', gdprSchema);
    
    return schemas;
  }

  async createIndustrySpecificSchemas(): Promise<Map<string, string>> {
    const schemas = new Map<string, string>();
    
    // Create industry schemas in parallel
    const [hipaaSchema, finservSchema] = await Promise.all([
      this.createHIPAASchema(),
      this.createFinancialServicesSchema()
    ]);
    
    schemas.set('hipaa-compliance', hipaaSchema);
    schemas.set('finserv-authorization', finservSchema);
    
    return schemas;
  }

  **AML Schema Creation**
  
  ```typescript
  private async createAMLSchema(): Promise<string> {
    // Anti-Money Laundering screening results schema
    return await this.createSchema({
      name: 'aml-screening-v1',
      description: 'Anti-Money Laundering screening results',
      definition: 'cleared:bool,riskLevel:uint8,checkDate:uint64,provider:string,sanctionsCheck:bool,pepCheck:bool,adverseMediaCheck:bool,nextReview:uint64,timestamp:uint64',
      category: 'compliance',
      revocable: true,
      maxAge: 90 * 24 * 60 * 60, // 90 days
      validationRules: {
        riskLevel: { min: 0, max: 100 },
        nextReview: { required: true },
        provider: { allowed: ['chainalysis', 'elliptic', 'scorechain'] }
      }
    });
  }

private async createSOXSchema(): Promise<string> {
  // Sarbanes-Oxley compliance attestation schema
  return await this.createSchema({
    name: 'sox-compliance-v1',
    description: 'Sarbanes-Oxley compliance attestation',
    definition: 'compliant:bool,controlsTested:uint8,deficiencies:uint8,auditDate:uint64,auditor:string,certificationLevel:string,remediation:string,nextAudit:uint64,timestamp:uint64',
    category: 'governance',
    revocable: true,
    maxAge: 365 * 24 * 60 * 60, // 1 year
    validationRules: {
      controlsTested: { min: 1 },
      certificationLevel: { allowed: ['basic', 'enhanced', 'comprehensive'] },
      auditor: { required: true }
    }
  });
}

private async createGDPRSchema(): Promise<string> {
  // GDPR data processing compliance schema
  return await this.createSchema({
    name: 'gdpr-data-processing-v1',
    description: 'GDPR data processing compliance',
    definition: 'lawfulBasis:string,dataCategories:string,processingPurpose:string,retentionPeriod:uint32,consentObtained:bool,dataMinimized:bool,securityMeasures:string,dpoApproved:bool,timestamp:uint64',
    category: 'privacy',
    revocable: true,
    maxAge: 180 * 24 * 60 * 60, // 6 months
    validationRules: {
      lawfulBasis: { allowed: ['consent', 'contract', 'legal_obligation', 'vital_interests', 'public_task', 'legitimate_interests'] },
      retentionPeriod: { max: 7 * 365 * 24 * 60 * 60 }, // Max 7 years
      consentObtained: { required: true },
      dpoApproved: { required: true }
    }
  });
}

private async createHIPAASchema(): Promise<string> {
  // Healthcare HIPAA compliance verification schema
  return await this.createSchema({
    name: 'hipaa-compliance-v1',
    description: 'Healthcare HIPAA compliance verification',
    definition: 'covered:bool,associateType:string,trainingComplete:bool,trainingDate:uint64,accessLevel:string,auditTrail:bool,encryptionUsed:bool,incidentCount:uint8,lastReview:uint64,timestamp:uint64',
    category: 'healthcare',
    revocable: true,
    maxAge: 365 * 24 * 60 * 60,
    validationRules: {
      associateType: { allowed: ['covered_entity', 'business_associate', 'subcontractor'] },
      accessLevel: { allowed: ['basic', 'administrative', 'clinical', 'technical'] },
      trainingComplete: { required: true }
    }
  });
}

private async createFinancialServicesSchema(): Promise<string> {
  // Financial services authorization and licensing schema
  return await this.createSchema({
    name: 'finserv-authorization-v1',
    description: 'Financial services authorization and licensing',
    definition: 'licensed:bool,licenseType:string,licenseNumber:string,jurisdiction:string,issuedDate:uint64,expiryDate:uint64,supervisoryBody:string,capitalRequirement:uint64,bondRequired:bool,bondAmount:uint64,timestamp:uint64',
    category: 'financial',
    revocable: true,
    maxAge: 30 * 24 * 60 * 60, // 30 days
    validationRules: {
      licenseType: { allowed: ['broker_dealer', 'investment_advisor', 'money_transmitter', 'bank', 'credit_union'] },
      capitalRequirement: { min: 0 },
      bondRequired: { required: true }
    }
  });
}

private async createSchema(definition: SchemaDefinition): Promise<string> {
  // Validate schema definition
  this.validateSchemaDefinition(definition);
  
  // Create schema on-chain
  const result = await this.sdk.createSchema({
    schemaName: definition.name,
    schemaContent: definition.definition,
    revocable: definition.revocable
  });
  
  if (result.error) {
    throw new Error(`Schema creation failed: ${result.error}`);
  }
  
  // Store schema metadata
  this.schemaRegistry.set(definition.name, {
    ...definition,
    schemaUID: result.data.schemaUID,
    createdAt: Date.now()
  });
  
  return result.data.schemaUID;
}

private validateSchemaDefinition(definition: SchemaDefinition): void {
  // Validate field definitions
  const fields = definition.definition.split(',');
  const fieldNames = new Set<string>();
  
  for (const field of fields) {
    const [name, type] = field.split(':');
    
    if (!name || !type) {
      throw new Error(`Invalid field definition: ${field}`);
    }
    
    if (fieldNames.has(name)) {
      throw new Error(`Duplicate field name: ${name}`);
    }
    
    fieldNames.add(name);
    
    if (!this.isValidFieldType(type)) {
      throw new Error(`Invalid field type: ${type}`);
    }
  }
  
  // Validate required fields
  const requiredFields = ['timestamp'];
  for (const required of requiredFields) {
    if (!fieldNames.has(required)) {
      throw new Error(`Missing required field: ${required}`);
    }
  }
  
  // Validate naming conventions
  if (!definition.name.includes('-v')) {
    throw new Error('Schema name must include version identifier');
  }
}

private isValidFieldType(type: string): boolean {
  const validTypes = [
    'bool', 'string', 'uint8', 'uint16', 'uint32', 'uint64',
    'int8', 'int16', 'int32', 'int64', 'address', 'bytes'
  ];
  return validTypes.includes(type);
}
}

interface SchemaDefinition {
name: string;
description: string;
definition: string;
category: string;
revocable: boolean;
maxAge?: number;
validationRules?: Record<string, any>;
schemaUID?: string;
createdAt?: number;
}

class ProcessSchemaManager {
  private sdk: StellarAttestSDK | SolanaAttestSDK;
  
  constructor(sdk: StellarAttestSDK | SolanaAttestSDK) {
    this.sdk = sdk;
  }

  async createProcessSchemas(): Promise<Map<string, string>> {
    const schemas = new Map<string, string>();
    
    // Loan Approval Process Schema
    const loanProcessSchema = await this.createProcessSchema({
      name: 'loan-approval-process-v1',
      description: 'Multi-step loan approval process tracking',
      steps: [
        {
          name: 'application_submitted',
          fields: 'applicationId:string,applicant:address,requestedAmount:uint64,purpose:string,submittedDate:uint64'
        },
        {
          name: 'credit_check_completed',
          fields: 'applicationId:string,creditScore:uint16,creditProvider:string,checkDate:uint64,approved:bool'
        },
        {
          name: 'income_verification',
          fields: 'applicationId:string,incomeVerified:bool,employmentStatus:string,verificationMethod:string,verifiedDate:uint64'
        },
        {
          name: 'collateral_assessment',
          fields: 'applicationId:string,collateralType:string,assessedValue:uint64,assessor:string,assessmentDate:uint64'
        },
        {
          name: 'final_approval',
          fields: 'applicationId:string,approved:bool,approvedAmount:uint64,interestRate:uint16,termMonths:uint16,approver:string,approvalDate:uint64'
        }
      ],
      category: 'lending',
      revocable: false
    });
    schemas.set('loan-process', loanProcessSchema);
    
    // Clinical Trial Participation Schema
    const clinicalTrialSchema = await this.createProcessSchema({
      name: 'clinical-trial-participation-v1',
      description: 'Clinical trial participant tracking',
      steps: [
        {
          name: 'screening',
          fields: 'trialId:string,participant:address,eligibilityMet:bool,consentSigned:bool,screeningDate:uint64'
        },
        {
          name: 'enrollment',
          fields: 'trialId:string,participant:address,enrolled:bool,cohort:string,enrollmentDate:uint64,randomizationCode:string'
        },
        {
          name: 'treatment_administration',
          fields: 'trialId:string,participant:address,treatmentGroup:string,dosage:string,administrationDate:uint64,sideEffects:string'
        },
        {
          name: 'follow_up',
          fields: 'trialId:string,participant:address,followUpDate:uint64,responseAssessment:string,adverseEvents:string,continueTreatment:bool'
        },
        {
          name: 'completion',
          fields: 'trialId:string,participant:address,completed:bool,completionDate:uint64,reason:string,finalAssessment:string'
        }
      ],
      category: 'healthcare',
      revocable: false
    });
    schemas.set('clinical-trial', clinicalTrialSchema);
    
    return schemas;
  }

  private async createProcessSchema(definition: ProcessSchemaDefinition): Promise<string> {
    // Create individual schemas for each step
    const stepSchemas: string[] = [];
    
    for (const step of definition.steps) {
      const stepSchemaName = `${definition.name}-${step.name}`;
      const stepDefinition = `${step.fields},stepNumber:uint8,processId:string,timestamp:uint64`;
      
      const result = await this.sdk.createSchema({
        schemaName: stepSchemaName,
        schemaContent: stepDefinition,
        revocable: definition.revocable
      });
      
      if (result.error) {
        throw new Error(`Step schema creation failed: ${result.error}`);
      }
      
      stepSchemas.push(result.data.schemaUID);
    }
    
    // Create master process schema
    const masterDefinition = `processType:string,totalSteps:uint8,currentStep:uint8,status:string,startedDate:uint64,completedDate:uint64,timestamp:uint64`;
    
    const masterResult = await this.sdk.createSchema({
      schemaName: definition.name,
      schemaContent: masterDefinition,
      revocable: definition.revocable
    });
    
    if (masterResult.error) {
      throw new Error(`Master process schema creation failed: ${masterResult.error}`);
    }
    
    return masterResult.data.schemaUID;
  }
}

interface ProcessStep {
  name: string;
  fields: string;
}

interface ProcessSchemaDefinition {
  name: string;
  description: string;
  steps: ProcessStep[];
  category: string;
  revocable: boolean;
}

class HierarchicalSchemaManager {
  private sdk: StellarAttestSDK | SolanaAttestSDK;
  private schemaHierarchy: Map<string, string[]> = new Map();
  
  constructor(sdk: StellarAttestSDK | SolanaAttestSDK) {
    this.sdk = sdk;
  }

  async createEducationHierarchy(): Promise<Map<string, string>> {
    const schemas = new Map<string, string>();
    
    // Base education schema
    const baseEducationSchema = await this.sdk.createSchema({
      schemaName: 'education-base-v1',
      schemaContent: 'hasEducation:bool,level:string,verified:bool,timestamp:uint64',
      revocable: false
    });
    
    if (baseEducationSchema.error) {
      throw new Error(`Base education schema failed: ${baseEducationSchema.error}`);
    }
    schemas.set('education-base', baseEducationSchema.data.schemaUID);
    
    // High school diploma schema (extends base)
    const highSchoolSchema = await this.sdk.createSchema({
      schemaName: 'education-highschool-v1',
      schemaContent: 'hasEducation:bool,level:string,verified:bool,institution:string,graduationYear:uint16,gpa:uint8,honors:string,transcript:string,timestamp:uint64',
      revocable: false
    });
    
    if (highSchoolSchema.error) {
      throw new Error(`High school schema failed: ${highSchoolSchema.error}`);
    }
    schemas.set('education-highschool', highSchoolSchema.data.schemaUID);
    
    // Bachelor's degree schema (extends high school)
    const bachelorSchema = await this.sdk.createSchema({
      schemaName: 'education-bachelor-v1',
      schemaContent: 'hasEducation:bool,level:string,verified:bool,institution:string,graduationYear:uint16,gpa:uint8,honors:string,transcript:string,major:string,minor:string,credits:uint16,accreditation:string,timestamp:uint64',
      revocable: false
    });
    
    if (bachelorSchema.error) {
      throw new Error(`Bachelor schema failed: ${bachelorSchema.error}`);
    }
    schemas.set('education-bachelor', bachelorSchema.data.schemaUID);
    
    // Graduate degree schema (extends bachelor)
    const graduateSchema = await this.sdk.createSchema({
      schemaName: 'education-graduate-v1',
      schemaContent: 'hasEducation:bool,level:string,verified:bool,institution:string,graduationYear:uint16,gpa:uint8,honors:string,transcript:string,major:string,minor:string,credits:uint16,accreditation:string,degreeType:string,thesis:string,advisor:string,researchArea:string,timestamp:uint64',
      revocable: false
    });
    
    if (graduateSchema.error) {
      throw new Error(`Graduate schema failed: ${graduateSchema.error}`);
    }
    schemas.set('education-graduate', graduateSchema.data.schemaUID);
    
    // Define hierarchy relationships
    this.schemaHierarchy.set('education-base', []);
    this.schemaHierarchy.set('education-highschool', ['education-base']);
    this.schemaHierarchy.set('education-bachelor', ['education-highschool']);
    this.schemaHierarchy.set('education-graduate', ['education-bachelor']);
    
    return schemas;
  }

  async verifyHierarchicalRequirements(
    userAddress: string,
    targetSchema: string
  ): Promise<HierarchyVerificationResult> {
    const requiredSchemas = this.schemaHierarchy.get(targetSchema) || [];
    const verificationResults: Map<string, boolean> = new Map();
    
    for (const requiredSchema of requiredSchemas) {
      const attestation = await this.sdk.fetchAttestation({
        schemaUID: requiredSchema,
        subject: userAddress
      });
      
      verificationResults.set(
        requiredSchema,
        !!(attestation.data && !attestation.data.revoked)
      );
    }
    
    const allRequirementsMet = Array.from(verificationResults.values()).every(met => met);
    
    return {
      eligible: allRequirementsMet,
      requiredSchemas,
      verificationResults,
      missingRequirements: Array.from(verificationResults.entries())
        .filter(([, met]) => !met)
        .map(([schema]) => schema)
    };
  }
}

interface HierarchyVerificationResult {
  eligible: boolean;
  requiredSchemas: string[];
  verificationResults: Map<string, boolean>;
  missingRequirements: string[];
}

class CompositeSchemaManager {
  private sdk: StellarAttestSDK | SolanaAttestSDK;
  
  constructor(sdk: StellarAttestSDK | SolanaAttestSDK) {
    this.sdk = sdk;
  }

  async createEmploymentVerificationComposite(): Promise<string> {
    // Comprehensive employment verification combining multiple checks
    const compositeSchema = await this.sdk.createSchema({
      schemaName: 'employment-verification-composite-v1',
      schemaContent: 'employed:bool,employer:string,position:string,startDate:uint64,salary:uint64,verified:bool,backgroundCheck:bool,referenceCheck:bool,skillAssessment:bool,educationVerified:bool,identityVerified:bool,creditCheck:bool,drugTest:bool,verificationScore:uint8,timestamp:uint64',
      revocable: true
    });
    
    if (compositeSchema.error) {
      throw new Error(`Composite schema creation failed: ${compositeSchema.error}`);
    }
    
    return compositeSchema.data.schemaUID;
  }

  async issueCompositeAttestation(
    subjectAddress: string,
    verificationData: EmploymentVerificationData
  ): Promise<string> {
    // Calculate composite verification score
    const score = this.calculateCompositeScore(verificationData);
    
    // Create composite attestation value
    const attestationValue = `employed:${verificationData.employed},employer:${verificationData.employer},position:${verificationData.position},startDate:${verificationData.startDate},salary:${verificationData.salary},verified:${verificationData.verified},backgroundCheck:${verificationData.backgroundCheck},referenceCheck:${verificationData.referenceCheck},skillAssessment:${verificationData.skillAssessment},educationVerified:${verificationData.educationVerified},identityVerified:${verificationData.identityVerified},creditCheck:${verificationData.creditCheck},drugTest:${verificationData.drugTest},verificationScore:${score},timestamp:${Math.floor(Date.now() / 1000)}`;
    
    const attestation = await this.sdk.attest({
      schemaUID: 'employment-verification-composite-v1',
      subject: subjectAddress,
      value: attestationValue,
      reference: `employment-composite-${Date.now()}`
    });
    
    if (attestation.error) {
      throw new Error(`Composite attestation failed: ${attestation.error}`);
    }
    
    return attestation.data;
  }

  private calculateCompositeScore(data: EmploymentVerificationData): number {
    let score = 0;
    let maxScore = 0;
    
    // Weight different verification types
    const weights = {
      employed: 20,
      verified: 15,
      backgroundCheck: 10,
      referenceCheck: 10,
      skillAssessment: 10,
      educationVerified: 10,
      identityVerified: 15,
      creditCheck: 5,
      drugTest: 5
    };
    
    Object.entries(weights).forEach(([key, weight]) => {
      maxScore += weight;
      if (data[key as keyof EmploymentVerificationData]) {
        score += weight;
      }
    });
    
    return Math.round((score / maxScore) * 100);
  }
}

interface EmploymentVerificationData {
  employed: boolean;
  employer: string;
  position: string;
  startDate: number;
  salary: number;
  verified: boolean;
  backgroundCheck: boolean;
  referenceCheck: boolean;
  skillAssessment: boolean;
  educationVerified: boolean;
  identityVerified: boolean;
  creditCheck: boolean;
  drugTest: boolean;
}

class SchemaTestFramework {
  private sdk: StellarAttestSDK | SolanaAttestSDK;
  
  constructor(sdk: StellarAttestSDK | SolanaAttestSDK) {
    this.sdk = sdk;
  }

  async testSchemaDefinition(
    schemaDefinition: string,
    testCases: SchemaTestCase[]
  ): Promise<SchemaTestResult> {
    const results: TestCaseResult[] = [];
    
    for (const testCase of testCases) {
      try {
        const result = await this.validateSchemaData(schemaDefinition, testCase.data);
        
        results.push({
          name: testCase.name,
          data: testCase.data,
          expected: testCase.expected,
          actual: result.valid,
          passed: result.valid === testCase.expected,
          errors: result.errors
        });
      } catch (error) {
        results.push({
          name: testCase.name,
          data: testCase.data,
          expected: testCase.expected,
          actual: false,
          passed: false,
          errors: [error.message]
        });
      }
    }
    
    const passed = results.filter(r => r.passed).length;
    const total = results.length;
    
    return {
      schemaDefinition,
      testCases: results,
      summary: {
        total,
        passed,
        failed: total - passed,
        successRate: (passed / total) * 100
      }
    };
  }

  private async validateSchemaData(
    schemaDefinition: string,
    data: string
  ): Promise<{ valid: boolean; errors: string[] }> {
    const errors: string[] = [];
    
    // Parse schema definition
    const schemaFields = this.parseSchemaDefinition(schemaDefinition);
    const dataFields = this.parseDataString(data);
    
    // Check required fields
    for (const field of schemaFields) {
      if (!dataFields.has(field.name)) {
        errors.push(`Missing required field: ${field.name}`);
      } else {
        // Validate field type
        const value = dataFields.get(field.name)!;
        if (!this.validateFieldType(value, field.type)) {
          errors.push(`Invalid type for field ${field.name}: expected ${field.type}, got ${typeof value}`);
        }
      }
    }
    
    // Check for extra fields
    for (const [fieldName] of dataFields) {
      if (!schemaFields.find(f => f.name === fieldName)) {
        errors.push(`Unexpected field: ${fieldName}`);
      }
    }
    
    return {
      valid: errors.length === 0,
      errors
    };
  }

  private parseSchemaDefinition(definition: string): SchemaField[] {
    return definition.split(',').map(field => {
      const [name, type] = field.split(':');
      return { name: name.trim(), type: type.trim() };
    });
  }

  private parseDataString(data: string): Map<string, string> {
    const fields = new Map<string, string>();
    data.split(',').forEach(pair => {
      const [key, value] = pair.split(':');
      fields.set(key.trim(), value.trim());
    });
    return fields;
  }

  private validateFieldType(value: string, expectedType: string): boolean {
    switch (expectedType) {
      case 'bool':
        return value === 'true' || value === 'false';
      case 'uint8':
        const uint8Value = parseInt(value);
        return !isNaN(uint8Value) && uint8Value >= 0 && uint8Value <= 255;
      case 'uint16':
        const uint16Value = parseInt(value);
        return !isNaN(uint16Value) && uint16Value >= 0 && uint16Value <= 65535;
      case 'uint32':
        const uint32Value = parseInt(value);
        return !isNaN(uint32Value) && uint32Value >= 0 && uint32Value <= 4294967295;
      case 'uint64':
        const uint64Value = parseInt(value);
        return !isNaN(uint64Value) && uint64Value >= 0;
      case 'string':
        return typeof value === 'string' && value.length > 0;
      case 'address':
        return /^[a-zA-Z0-9]{20,64}$/.test(value); // Simplified address validation
      case 'bytes':
        return /^0x[a-fA-F0-9]*$/.test(value); // Hex string validation
      default:
        return false;
    }
  }
}

interface SchemaField {
  name: string;
  type: string;
}

interface SchemaTestCase {
  name: string;
  data: string;
  expected: boolean; // Should this data be valid?
}

interface TestCaseResult {
  name: string;
  data: string;
  expected: boolean;
  actual: boolean;
  passed: boolean;
  errors: string[];
}

interface SchemaTestResult {
  schemaDefinition: string;
  testCases: TestCaseResult[];
  summary: {
    total: number;
    passed: number;
    failed: number;
    successRate: number;
  };
}

class SchemaEvolutionManager {
  private sdk: StellarAttestSDK | SolanaAttestSDK;
  private versionRegistry: Map<string, SchemaVersion[]> = new Map();
  
  constructor(sdk: StellarAttestSDK | SolanaAttestSDK) {
    this.sdk = sdk;
  }

  async planSchemaEvolution(
    currentSchemaUID: string,
    proposedDefinition: string
  ): Promise<EvolutionPlan> {
    const currentSchema = await this.getSchemaDefinition(currentSchemaUID);
    
    if (!currentSchema) {
      throw new Error('Current schema not found');
    }
    
    const compatibility = this.analyzeCompatibility(
      currentSchema.definition,
      proposedDefinition
    );
    
    return {
      currentVersion: currentSchema.version,
      proposedVersion: this.incrementVersion(currentSchema.version),
      compatibility,
      migrationRequired: !compatibility.backwardCompatible,
      migrationStrategy: this.generateMigrationStrategy(compatibility),
      risks: this.assessMigrationRisks(compatibility)
    };
  }

  private analyzeCompatibility(
    currentDefinition: string,
    proposedDefinition: string
  ): CompatibilityAnalysis {
    const currentFields = this.parseSchemaDefinition(currentDefinition);
    const proposedFields = this.parseSchemaDefinition(proposedDefinition);
    
    const removedFields = currentFields.filter(
      current => !proposedFields.find(proposed => proposed.name === current.name)
    );
    
    const addedFields = proposedFields.filter(
      proposed => !currentFields.find(current => current.name === proposed.name)
    );
    
    const modifiedFields = currentFields.filter(current => {
      const proposed = proposedFields.find(p => p.name === current.name);
      return proposed && proposed.type !== current.type;
    });
    
    return {
      backwardCompatible: removedFields.length === 0 && modifiedFields.length === 0,
      forwardCompatible: addedFields.length === 0 && modifiedFields.length === 0,
      removedFields,
      addedFields,
      modifiedFields
    };
  }

  private generateMigrationStrategy(
    compatibility: CompatibilityAnalysis
  ): MigrationStrategy {
    if (compatibility.backwardCompatible) {
      return {
        type: 'seamless',
        steps: [
          'Deploy new schema version',
          'Update applications to use new schema',
          'Existing attestations remain valid'
        ]
      };
    }
    
    if (compatibility.removedFields.length > 0 || compatibility.modifiedFields.length > 0) {
      return {
        type: 'breaking',
        steps: [
          'Create migration mapping for existing attestations',
          'Deploy new schema version',
          'Migrate existing attestations to new format',
          'Update applications to use new schema',
          'Deprecate old schema version'
        ]
      };
    }
    
    return {
      type: 'additive',
      steps: [
        'Deploy new schema version with optional fields',
        'Update applications incrementally',
        'Backfill new fields where possible'
      ]
    };
  }

  private assessMigrationRisks(compatibility: CompatibilityAnalysis): string[] {
    const risks: string[] = [];
    
    if (compatibility.removedFields.length > 0) {
      risks.push('Data loss: Removed fields will lose information');
      risks.push('Application compatibility: Existing applications may break');
    }
    
    if (compatibility.modifiedFields.length > 0) {
      risks.push('Type conversion: Field type changes may cause data corruption');
      risks.push('Validation failures: Existing data may not pass new validation');
    }
    
    if (!compatibility.backwardCompatible) {
      risks.push('Breaking change: Requires coordinated deployment');
      risks.push('Downtime: May require service interruption');
    }
    
    return risks;
  }
}

interface SchemaVersion {
  version: string;
  schemaUID: string;
  definition: string;
  createdAt: number;
  deprecated?: boolean;
}

interface CompatibilityAnalysis {
  backwardCompatible: boolean;
  forwardCompatible: boolean;
  removedFields: SchemaField[];
  addedFields: SchemaField[];
  modifiedFields: SchemaField[];
}

interface MigrationStrategy {
  type: 'seamless' | 'additive' | 'breaking';
  steps: string[];
}

interface EvolutionPlan {
  currentVersion: string;
  proposedVersion: string;
  compatibility: CompatibilityAnalysis;
  migrationRequired: boolean;
  migrationStrategy: MigrationStrategy;
  risks: string[];
}