#!/usr/bin/env node

/**
 * Sync Instructions to MongoDB
 *
 * Syncs .claude/instruction-history.json to MongoDB governanceRules collection
 * Handles: inserts, updates, deactivations
 */

const fs = require('fs');
const path = require('path');
const mongoose = require('mongoose');
require('dotenv').config();

const GovernanceRule = require('../src/models/GovernanceRule.model');

const INSTRUCTION_FILE = path.join(__dirname, '../.claude/instruction-history.json');
const MONGODB_URI = process.env.MONGODB_URI || 'mongodb://localhost:27017/tractatus_dev';

async function syncToDatabase(options = {}) {
  const { silent = false } = options;

  if (!silent) {
    console.log('═══════════════════════════════════════════════════════════');
    console.log('  SYNC INSTRUCTIONS TO MONGODB');
    console.log('═══════════════════════════════════════════════════════════\n');
  }

  try {
    // Connect to MongoDB only if not already connected
    if (mongoose.connection.readyState !== 1) {
      if (!silent) console.log('📡 Connecting to MongoDB...');
      await mongoose.connect(MONGODB_URI);
      if (!silent) console.log(`   ✓ Connected to ${MONGODB_URI}\n`);
    } else {
      if (!silent) console.log('📡 Using existing MongoDB connection\n');
    }

    // Read instruction history
    console.log('📖 Reading instruction-history.json...');
    const data = JSON.parse(fs.readFileSync(INSTRUCTION_FILE, 'utf8'));
    console.log(`   ✓ Version: ${data.version}`);
    console.log(`   ✓ Total instructions: ${data.instructions.length}`);
    console.log(`   ✓ Active instructions: ${data.instructions.filter(i => i.active !== false).length}\n`);

    // Get current rules from database
    console.log('📊 Fetching current rules from database...');
    const existingRules = await GovernanceRule.find({});
    const existingRuleIds = new Set(existingRules.map(r => r.id));
    console.log(`   ✓ Found ${existingRules.length} existing rules\n`);

    // Sync stats
    let inserted = 0;
    let updated = 0;
    let deactivated = 0;
    let skipped = 0;
    const errors = [];

    console.log('🔄 Syncing instructions...\n');

    // Process each instruction
    for (const inst of data.instructions) {
      try {
        const ruleData = {
          id: inst.id,
          text: inst.text,
          quadrant: inst.quadrant,
          persistence: inst.persistence,
          temporalScope: inst.temporal_scope || 'PERMANENT',
          active: inst.active !== false,
          notes: inst.notes || '',
          source: inst.session_id ? 'user_instruction' : 'framework_default',
          createdBy: 'claude-code'
        };

        // Handle additional fields if present
        if (inst.parameters) {
          // Store parameters as notes if not already in notes
          if (!ruleData.notes.includes('Parameters:')) {
            ruleData.notes += `\n\nParameters: ${JSON.stringify(inst.parameters)}`;
          }
        }

        if (inst.deprecates) {
          if (!ruleData.notes.includes('Deprecates:')) {
            ruleData.notes += `\n\nDeprecates: ${inst.deprecates.join(', ')}`;
          }
        }

        if (inst.replaces) {
          if (!ruleData.notes.includes('Replaces:')) {
            ruleData.notes += `\n\nReplaces: ${inst.replaces.join(', ')}`;
          }
        }

        if (inst.part_of) {
          if (!ruleData.notes.includes('Part of:')) {
            ruleData.notes += `\n\nPart of: ${inst.part_of}`;
          }
        }

        if (inst.created_date) {
          if (!ruleData.notes.includes('Created:')) {
            ruleData.notes += `\n\nCreated: ${inst.created_date}`;
          }
        }

        if (inst.deprecation_reason) {
          if (!ruleData.notes.includes('Deprecation reason:')) {
            ruleData.notes += `\n\nDeprecation reason: ${inst.deprecation_reason}`;
          }
        }

        // Clean up notes (remove leading/trailing whitespace)
        ruleData.notes = ruleData.notes.trim();

        if (existingRuleIds.has(inst.id)) {
          // Update existing rule
          const result = await GovernanceRule.findOneAndUpdate(
            { id: inst.id },
            ruleData,
            { new: true, runValidators: true }
          );

          if (result) {
            updated++;
            console.log(`   ↻ Updated ${inst.id}`);
          } else {
            errors.push({ id: inst.id, error: 'Update returned null' });
            console.log(`   ✗ Failed to update ${inst.id}`);
          }
        } else {
          // Insert new rule
          const newRule = new GovernanceRule(ruleData);
          await newRule.save();
          inserted++;
          console.log(`   + Inserted ${inst.id}`);
        }
      } catch (err) {
        errors.push({ id: inst.id, error: err.message });
        console.log(`   ✗ Error processing ${inst.id}: ${err.message}`);
      }
    }

    console.log('');

    // Deactivate rules that no longer exist in JSON
    const jsonRuleIds = new Set(data.instructions.map(i => i.id));
    for (const existingRule of existingRules) {
      if (!jsonRuleIds.has(existingRule.id) && existingRule.active) {
        existingRule.active = false;
        existingRule.notes += `\n\nDeactivated during sync on ${new Date().toISOString()} - no longer in instruction-history.json`;
        await existingRule.save();
        deactivated++;
        console.log(`   ⊝ Deactivated ${existingRule.id}`);
      }
    }

    if (deactivated > 0) console.log('');

    // Summary
    console.log('═══════════════════════════════════════════════════════════');
    console.log('  SYNC SUMMARY');
    console.log('═══════════════════════════════════════════════════════════\n');
    console.log(`   Inserted: ${inserted}`);
    console.log(`   Updated: ${updated}`);
    console.log(`   Deactivated: ${deactivated}`);
    console.log(`   Errors: ${errors.length}`);
    console.log('');

    if (errors.length > 0) {
      console.log('   Errors encountered:');
      errors.forEach(({ id, error }) => {
        console.log(`     - ${id}: ${error}`);
      });
      console.log('');
    }

    // Verify final counts
    const activeCount = await GovernanceRule.countDocuments({ active: true });
    const totalCount = await GovernanceRule.countDocuments({});

    console.log(`   Database: ${activeCount} active / ${totalCount} total`);
    console.log(`   JSON file: ${data.stats.active_instructions} active / ${data.stats.total_instructions} total`);
    console.log('');

    if (activeCount === data.stats.active_instructions) {
      console.log('✅ Sync successful - counts match!');
    } else {
      console.log('⚠️  WARNING: Active counts do not match');
      console.log(`   Expected ${data.stats.active_instructions}, got ${activeCount}`);
    }

    console.log('');

    // Return success with stats
    return {
      success: true,
      added: inserted,
      updated: updated,
      deactivated: deactivated,
      errors: errors.length,
      finalCount: activeCount
    };

  } catch (err) {
    console.error('❌ Sync failed:', err.message);
    console.error(err.stack);

    if (require.main === module) {
      process.exit(1);
    }

    return {
      success: false,
      error: err.message
    };
  } finally {
    // Only disconnect if running as standalone script (not imported)
    if (require.main === module) {
      await mongoose.disconnect();
      console.log('📡 Disconnected from MongoDB\n');
    }
  }
}

// Export for use by server.js and other modules
module.exports = {
  syncInstructions: syncToDatabase
};

// Run directly if not imported
if (require.main === module) {
  syncToDatabase();
}