#!/usr/bin/env node
/**
 * Schema Sync Validation - Enforces inst_058
 * Validates field mappings before synchronizing JSON config to MongoDB
 *
 * Usage: node scripts/verify-schema-sync.js <json-file> <collection-name>
 */

const fs = require('fs');
const path = require('path');
const mongoose = require('mongoose');

// Known schema mappings that require transformation
const KNOWN_MAPPINGS = {
  'instruction-history': {
    // inst_075 has "rules" in JSON but must be "SYSTEM"/"STRATEGIC"/"OPERATIONAL"/"TACTICAL" in DB
    quadrant: {
      sourceField: 'quadrant',
      destField: 'quadrant',
      transform: (value) => {
        // Map "rules" to a valid quadrant
        if (value === 'rules') {
          console.warn('⚠️  Found "rules" quadrant - must map to SYSTEM/STRATEGIC/OPERATIONAL/TACTICAL');
          return null; // Indicates mapping required
        }
        return value;
      },
      enumValues: ['SYSTEM', 'STRATEGIC', 'OPERATIONAL', 'TACTICAL']
    },
    persistence: {
      sourceField: 'persistence',
      destField: 'persistence',
      transform: (value) => value,
      enumValues: ['HIGH', 'MEDIUM', 'LOW']
    }
  }
};

function validateMapping(jsonData, collectionName) {
  const issues = [];
  const mapping = KNOWN_MAPPINGS[collectionName];

  if (!mapping) {
    console.log(`\n⚠️  No schema mapping defined for collection: ${collectionName}`);
    console.log(`   Consider adding to KNOWN_MAPPINGS if enum constraints exist.\n`);
    return { valid: true, issues: [] };
  }

  // For instruction-history, validate each instruction
  if (collectionName === 'instruction-history') {
    if (!jsonData.instructions || !Array.isArray(jsonData.instructions)) {
      issues.push('JSON must have "instructions" array');
      return { valid: false, issues };
    }

    jsonData.instructions.forEach((inst, idx) => {
      // Check quadrant mapping
      if (inst.quadrant) {
        const quadrantMapping = mapping.quadrant;
        const transformed = quadrantMapping.transform(inst.quadrant);

        if (transformed === null) {
          issues.push({
            instruction: inst.id || `index ${idx}`,
            field: 'quadrant',
            value: inst.quadrant,
            issue: 'Value requires manual mapping',
            validValues: quadrantMapping.enumValues
          });
        } else if (!quadrantMapping.enumValues.includes(transformed)) {
          issues.push({
            instruction: inst.id || `index ${idx}`,
            field: 'quadrant',
            value: transformed,
            issue: 'Invalid enum value',
            validValues: quadrantMapping.enumValues
          });
        }
      }

      // Check persistence mapping
      if (inst.persistence) {
        const persistenceMapping = mapping.persistence;
        const transformed = persistenceMapping.transform(inst.persistence);

        if (!persistenceMapping.enumValues.includes(transformed)) {
          issues.push({
            instruction: inst.id || `index ${idx}`,
            field: 'persistence',
            value: transformed,
            issue: 'Invalid enum value',
            validValues: persistenceMapping.enumValues
          });
        }
      }
    });
  }

  return {
    valid: issues.length === 0,
    issues
  };
}

function testMappingWithSingleRecord(jsonData, collectionName) {
  console.log('\n🧪 Testing mapping with single record (inst_058 requirement)\n');

  if (collectionName === 'instruction-history') {
    const testRecord = jsonData.instructions[0];
    if (!testRecord) {
      console.log('⚠️  No records to test\n');
      return true;
    }

    console.log(`Testing: ${testRecord.id || 'first record'}`);
    console.log(`  Quadrant: ${testRecord.quadrant}`);
    console.log(`  Persistence: ${testRecord.persistence}`);

    const mapping = KNOWN_MAPPINGS[collectionName];
    if (mapping.quadrant) {
      const transformed = mapping.quadrant.transform(testRecord.quadrant);
      console.log(`  → Transformed quadrant: ${transformed}`);

      if (transformed === null || !mapping.quadrant.enumValues.includes(transformed)) {
        console.log(`  ❌ Mapping would fail for this record\n`);
        return false;
      }
    }

    console.log(`  ✅ Mapping successful\n`);
  }

  return true;
}

async function main() {
  const jsonFile = process.argv[2];
  const collectionName = process.argv[3];

  if (!jsonFile || !collectionName) {
    console.log('Usage: verify-schema-sync.js <json-file> <collection-name>');
    console.log('');
    console.log('Example:');
    console.log('  verify-schema-sync.js .claude/instruction-history.json instruction-history');
    console.log('');
    console.log('Enforces inst_058: Validates field mappings before sync operations');
    process.exit(0);
  }

  console.log('\n📊 Schema Sync Validation (inst_058)\n');
  console.log(`Source: ${jsonFile}`);
  console.log(`Target Collection: ${collectionName}\n`);

  // Load JSON file
  if (!fs.existsSync(jsonFile)) {
    console.log(`❌ File not found: ${jsonFile}\n`);
    process.exit(1);
  }

  const jsonData = JSON.parse(fs.readFileSync(jsonFile, 'utf8'));

  // Validate mappings
  const validation = validateMapping(jsonData, collectionName);

  if (!validation.valid) {
    console.log(`❌ Found ${validation.issues.length} mapping issue(s):\n`);
    validation.issues.forEach((issue, idx) => {
      console.log(`${idx + 1}. ${issue.instruction}`);
      console.log(`   Field: ${issue.field}`);
      console.log(`   Value: "${issue.value}"`);
      console.log(`   Issue: ${issue.issue}`);
      console.log(`   Valid values: ${issue.validValues.join(', ')}\n`);
    });

    console.log('Fix mapping issues before executing sync operation.\n');
    process.exit(1);
  }

  // Test with single record (inst_058 requirement)
  const testPassed = testMappingWithSingleRecord(jsonData, collectionName);

  if (!testPassed) {
    console.log('❌ Single record mapping test failed\n');
    console.log('Fix mapping functions before batch sync.\n');
    process.exit(1);
  }

  console.log('✅ All field mappings validated');
  console.log('✅ Single record test passed');
  console.log('\nSafe to proceed with batch sync operation.\n');
  process.exit(0);
}

main();