#!/usr/bin/env node
/**
 * Neo4j Auto-Sync Runner
 *
 * Runs as a standalone service for automated Neo4j synchronization.
 *
 * Usage:
 *   npx tsx apps/backend/src/scripts/neo4j-auto-sync.ts [command]
 *
 * Commands:
 *   start     - Start scheduler (default)
 *   sync      - Run single sync now
 *   full      - Run full sync (ignores checkpoint)
 *   status    - Show sync status
 *   help      - Show this help
 *
 * Environment Variables:
 *   NEO4J_LOCAL_URI        - Local Neo4j URI (default: bolt://localhost:7687)
 *   NEO4J_LOCAL_USER       - Local Neo4j user (default: neo4j)
 *   NEO4J_LOCAL_PASSWORD   - Local Neo4j password (default: password)
 *   NEO4J_URI              - Cloud Neo4j URI
 *   NEO4J_USER             - Cloud Neo4j user
 *   NEO4J_PASSWORD         - Cloud Neo4j password
 *   NEO4J_SYNC_SCHEDULE    - Cron schedule (default: "0 *\/6 * * *" = every 6 hours)
 */

import dotenv from 'dotenv';
import path from 'path';
import fs from 'fs';
import { Neo4jAutoSync } from '../services/Neo4jAutoSync.js';

// Load environment
dotenv.config({ path: path.resolve(process.cwd(), '.env.production') });
dotenv.config({ path: path.resolve(process.cwd(), '.env') });

const STATUS_FILE = path.join(process.cwd(), '.neo4j-sync-status.json');

async function main() {
  const command = process.argv[2] || 'start';

  console.log('═'.repeat(60));
  console.log('🔄 Neo4j Auto-Sync Service');
  console.log('═'.repeat(60));
  console.log('');

  switch (command) {
    case 'start':
      await startScheduler();
      break;

    case 'sync':
      await runSync(false);
      break;

    case 'full':
      await runSync(true);
      break;

    case 'status':
      showStatus();
      break;

    case 'help':
    default:
      showHelp();
      break;
  }
}

async function startScheduler() {
  const syncService = new Neo4jAutoSync();
  const schedule = process.env.NEO4J_SYNC_SCHEDULE || '0 */6 * * *';

  console.log('Configuration:');
  console.log(`  Local:    ${process.env.NEO4J_LOCAL_URI || 'bolt://localhost:7687'}`);
  console.log(`  Cloud:    ${process.env.NEO4J_URI || '(not configured)'}`);
  console.log(`  Schedule: ${schedule}`);
  console.log('');

  // Run initial sync
  console.log('Running initial sync...\n');
  await syncService.sync();

  // Start scheduler
  syncService.startScheduler();

  console.log('\n✅ Auto-sync service running. Press Ctrl+C to stop.\n');

  // Keep process alive
  process.on('SIGINT', () => {
    console.log('\n⏹️  Shutting down...');
    syncService.stopScheduler();
    process.exit(0);
  });

  // Keep alive
  setInterval(() => {
    // Heartbeat
  }, 60000);
}

async function runSync(forceFullSync: boolean) {
  const syncService = new Neo4jAutoSync();

  console.log(`Running ${forceFullSync ? 'FULL' : 'incremental'} sync...\n`);

  const status = await syncService.sync(forceFullSync);

  console.log('\n' + '═'.repeat(60));
  console.log('Sync Result:');
  console.log(`  Status:        ${status.status}`);
  console.log(`  Type:          ${status.lastSyncType}`);
  console.log(`  Nodes:         ${status.nodesSync}`);
  console.log(`  Relationships: ${status.relationshipsSync}`);
  console.log(`  Duration:      ${status.lastSyncDuration}ms`);
  if (status.error) {
    console.log(`  Error:         ${status.error}`);
  }
  console.log('═'.repeat(60));
}

function showStatus() {
  if (fs.existsSync(STATUS_FILE)) {
    const status = JSON.parse(fs.readFileSync(STATUS_FILE, 'utf-8'));
    console.log('Current Sync Status:');
    console.log('');
    console.log(`  Status:           ${status.status}`);
    console.log(`  Last Sync:        ${status.lastSyncTime || 'Never'}`);
    console.log(`  Sync Type:        ${status.lastSyncType || 'N/A'}`);
    console.log(`  Nodes Synced:     ${status.nodesSync || 0}`);
    console.log(`  Rels Synced:      ${status.relationshipsSync || 0}`);
    console.log(`  Duration:         ${status.lastSyncDuration ? status.lastSyncDuration + 'ms' : 'N/A'}`);
    console.log(`  Next Scheduled:   ${status.nextScheduledSync || 'N/A'}`);
    if (status.error) {
      console.log(`  Error:            ${status.error}`);
    }
  } else {
    console.log('No sync status found. Run a sync first.');
  }
}

function showHelp() {
  console.log(`
Usage: npx tsx apps/backend/src/scripts/neo4j-auto-sync.ts [command]

Commands:
  start     Start the scheduler service (runs continuously)
  sync      Run a single sync (incremental if checkpoint exists)
  full      Run a full sync (ignores checkpoint, replaces all data)
  status    Show current sync status
  help      Show this help message

Environment Variables:
  NEO4J_LOCAL_URI        Local Neo4j URI (default: bolt://localhost:7687)
  NEO4J_LOCAL_USER       Local Neo4j user (default: neo4j)
  NEO4J_LOCAL_PASSWORD   Local Neo4j password (default: password)
  NEO4J_URI              Cloud Neo4j URI (required)
  NEO4J_USER             Cloud Neo4j user (default: neo4j)
  NEO4J_PASSWORD         Cloud Neo4j password (required)
  NEO4J_SYNC_SCHEDULE    Cron schedule (default: 0 */6 * * * = every 6 hours)

Schedule Examples:
  0 */6 * * *     Every 6 hours
  0 */2 * * *     Every 2 hours
  0 0 * * *       Daily at midnight
  */30 * * * *    Every 30 minutes
  0 9,18 * * *    At 9am and 6pm

Examples:
  # Start auto-sync service (runs continuously)
  npx tsx apps/backend/src/scripts/neo4j-auto-sync.ts start

  # Run single sync
  npx tsx apps/backend/src/scripts/neo4j-auto-sync.ts sync

  # Force full sync
  npx tsx apps/backend/src/scripts/neo4j-auto-sync.ts full

  # Check status
  npx tsx apps/backend/src/scripts/neo4j-auto-sync.ts status
`);
}

main().catch(console.error);