import { LacertaDB } from 'lacertadb';

// 1. Instantiate LacertaDB orchestrator
const lacerta = new LacertaDB();

// 2. Acquire database instance
const db = await lacerta.getDatabase('application-nexus');

// 3. Initialize collection with QuickStore
const users = await db.createCollection('users');

// 4. Leverage QuickStore for ephemeral caching
db.quickStore.add('session', { userId: 'usr_123', token: 'xyz' });
const session = db.quickStore.get('session');

// 5. Persist documents with compression
await users.add({
  name: 'John Doe',
  email: 'john@example.com',
  metadata: { created: Date.now() }
});

// 6. Execute sophisticated queries
const results = await users.query({
  $and: [
    { 'metadata.created': { $gte: Date.now() - 86400000 } },
    { email: { $regex: '@example.com$' } }
  ]
});

// Initialize encrypted database with configurable parameters
const secureDb = await lacerta.getSecureDatabase(
  'classified-data',
  'user-pin-entropy',
  null,  // Auto-generate cryptographic salt
  {
    iterations: 200000,      // PBKDF2 iteration count
    hashAlgorithm: 'SHA-512' // Hashing algorithm selection
  }
);

// Encrypted operations maintain transparency
const secrets = await secureDb.createCollection('api-keys');
await secrets.add({ 
  service: 'stripe',
  key: await secureDb.encryption.encryptPrivateKey('sk_live_...', 'stripe.com')
});

// ES6 Module Syntax
import { LacertaDB, QuickStore } from 'lacertadb';

// Selective Component Import
import { 
  LacertaDB, 
  SecureDatabaseEncryption,
  PerformanceMonitor,
  MigrationManager,
  QuickStore,
  BTreeIndex,
  AsyncMutex
} from 'lacertadb';

// CommonJS Pattern
const { LacertaDB } = require('lacertadb');

{
  _id: "doc_1234567890_abc",        // Unique identifier
  _created: 1234567890,              // Creation timestamp
  _modified: 1234567890,             // Modification timestamp
  _permanent: false,                 // Cleanup immunity flag
  _compressed: true,                 // Compression status
  _encrypted: false,                 // Encryption status
  _attachments: [],                  // OPFS attachment references
  ...userDefinedFields               // Application data
}

// Automatic verification during operations
const btreeIndex = new BTreeIndex();
btreeIndex.insert(key, value); // Triggers periodic verification

// Manual verification
const report = await collection.verifyIndexes();
// {
//   'age_index': { healthy: true, issues: [] },
//   'email_index': { healthy: false, issues: [...], repaired: 2 }
// }

class Document {
  constructor(data = {}) {
    this._data = null;  // Private storage
    // ... other initialization
  }
  
  // Lazy getter for memory optimization
  get data() {
    return this._data || {};
  }
  
  set data(value) {
    this._data = value;
  }
}

class AsyncMutex {
  async runExclusive(callback) {
    const release = await this.acquire();
    try {
      return await callback();
    } finally {
      release();
    }
  }
}

async performTransaction(db, storeNames, mode, callback, retries = 3) {
  for (let i = 0; i < retries; i++) {
    try {
      return await executeTransaction();
    } catch (error) {
      if (i < retries - 1) {
        await new Promise(r => setTimeout(r, (2 ** i) * 100));
      }
    }
  }
}

// HIPAA-compliant patient data storage
const lacerta = new LacertaDB();
const healthDb = await lacerta.getSecureDatabase(
  'patient-records',
  await SecureDatabaseEncryption.generateSecurePIN(12),
  null,
  { iterations: 500000 }  // Enhanced security
);

const patients = await healthDb.createCollection('patients');
const vitals = await healthDb.createCollection('vitals');

// QuickStore for current session
healthDb.quickStore.add('current_patient', {
  id: 'pat_123',
  name: 'John Doe',
  sessionStart: Date.now()
});

// Create indexes for efficient queries
await patients.createIndex('mrn', { unique: true });  // Medical Record Number
await vitals.createIndex('patientId', { type: 'hash' });
await vitals.createIndex('timestamp', { type: 'btree' });

// Store patient with encryption
await patients.add({
  mrn: 'MRN123456',
  name: 'John Doe',
  dob: '1980-01-15',
  allergies: ['penicillin'],
  conditions: ['hypertension']
}, { permanent: true });

// Record vitals
await vitals.add({
  patientId: 'pat_123',
  timestamp: Date.now(),
  bloodPressure: { systolic: 120, diastolic: 80 },
  heartRate: 72,
  temperature: 98.6
});

// Aggregate patient statistics
const stats = await vitals.aggregate([
  { $match: { patientId: 'pat_123' } },
  { $sort: { timestamp: -1 } },
  { $limit: 100 },
  { $group: {
    _id: '$patientId',
    avgHeartRate: { $avg: '$heartRate' },
    avgSystolic: { $avg: '$bloodPressure.systolic' },
    readingCount: { $count: {} }
  }}
]);

// Game state management with QuickStore
const gameDb = await lacerta.getDatabase('game-state');
const quickStore = gameDb.quickStore;

// Immediate state updates via QuickStore
quickStore.add('player_state', {
  position: { x: 100, y: 200, z: 50 },
  health: 100,
  inventory: ['sword', 'potion'],
  score: 5000
});

// Persistent game saves
const saves = await gameDb.createCollection('saves');
await saves.createIndex('timestamp', { type: 'btree' });

async function saveGame() {
  const state = quickStore.get('player_state');
  await saves.add({
    ...state,
    savePoint: 'checkpoint_3',
    timestamp: Date.now()
  }, { compressed: true });
}

// Load recent saves
const recentSaves = await saves.query(
  { timestamp: { $gte: Date.now() - 86400000 } },
  { sort: { timestamp: -1 }, limit: 10 }
);

// Real-time analytics with caching strategies
const analyticsDb = await lacerta.getDatabase('analytics');
const events = await analyticsDb.createCollection('events');

// Configure aggressive caching for dashboards
events.configureCacheStrategy({
  type: 'lfu',  // Frequently accessed metrics
  maxSize: 1000,
  ttl: 300000  // 5-minute cache
});

// Create performance indexes
await events.createIndex('eventType', { type: 'hash' });
await events.createIndex('timestamp', { type: 'btree' });
await events.createIndex('userId', { type: 'hash' });

// Store events with batch operations
const eventBatch = Array.from({ length: 1000 }, (_, i) => ({
  eventType: ['click', 'view', 'purchase'][i % 3],
  userId: `user_${i % 100}`,
  timestamp: Date.now() - (i * 1000),
  metadata: { source: 'web', version: '2.0' }
}));

await events.batchAdd(eventBatch, { compressed: true });

// Complex analytics aggregation
const metrics = await events.aggregate([
  { $match: { 
    timestamp: { $gte: Date.now() - 3600000 }  // Last hour
  }},
  { $group: {
    _id: '$eventType',
    count: { $count: {} },
    uniqueUsers: { $addToSet: '$userId' }
  }},
  { $project: {
    eventType: '$_id',
    count: 1,
    uniqueUserCount: { $size: '$uniqueUsers' }
  }},
  { $sort: { count: -1 } }
]);

// Store computed metrics in QuickStore for instant access
analyticsDb.quickStore.add('dashboard_metrics', {
  computed: Date.now(),
  metrics,
  summary: {
    totalEvents: metrics.reduce((sum, m) => sum + m.count, 0),
    eventTypes: metrics.length
  }
});

// Initialize comprehensive monitoring
const monitor = lacerta.performanceMonitor;
monitor.startMonitoring();

// Custom performance tracking
class PerformanceTracker {
  constructor(monitor) {
    this.monitor = monitor;
    this.thresholds = {
      query: 50,      // ms
      write: 100,     // ms
      aggregate: 200  // ms
    };
  }
  
  async track(operation, type) {
    const start = performance.now();
    try {
      const result = await operation();
      const duration = performance.now() - start;
      
      this.monitor.recordOperation(type, duration);
      
      if (duration > this.thresholds[type]) {
        console.warn(`Slow ${type}: ${duration}ms`);
      }
      
      return result;
    } catch (error) {
      this.monitor.recordOperation(`${type}_error`, 0);
      throw error;
    }
  }
}

const tracker = new PerformanceTracker(monitor);

// Track operations
const results = await tracker.track(
  () => users.query({ age: { $gte: 18 } }),
  'query'
);

// Optimization recommendations
const tips = monitor.getOptimizationTips();
// Analyzes cache hit rates, latency patterns, memory trends

// B-Tree for range queries and sorting
await orders.createIndex('createdAt', { type: 'btree' });
await products.createIndex('price', { type: 'btree' });

// Hash for exact matches
await users.createIndex('email', { type: 'hash', unique: true });
await sessions.createIndex('token', { type: 'hash' });

// Text index for search
await articles.createIndex('content', { type: 'text' });

// Geo index for spatial queries
await stores.createIndex('location', { type: 'geo' });

// QuickStore for ephemeral, frequently accessed data
db.quickStore.add('ui_state', { theme: 'dark', sidebar: true });
db.quickStore.add('form_draft', { title: 'Unsaved', content: '...' });

// Collections for persistent, structured data
await documents.add({ title: 'Report', content: '...' });

// Connections are automatically pooled and reused
const db1 = await lacerta.getDatabase('app');  // New connection
const db2 = await lacerta.getDatabase('app');  // Reuses connection

// Manual cleanup when necessary
connectionPool.releaseConnection('app');

// Use projection to minimize memory footprint
const summaries = await posts.query(
  { published: true },
  { 
    projection: { title: 1, excerpt: 1 },  // Only needed fields
    limit: 100
  }
);

// Clear caches periodically
setInterval(() => {
  posts.clearCache();
}, 300000);  // Every 5 minutes

// Configure appropriate cache sizes
posts.configureCacheStrategy({
  type: 'lru',
  maxSize: 50  // Limit cache entries
});

// 1. Export existing data
const oldDb = await getOldDatabase();
const backup = await oldDb.export('json');

// 2. Initialize new version
const newLacerta = new LacertaDB();
const newDb = await newLacerta.getDatabase('migrated');

// 3. Import with QuickStore preservation
await newDb.import(backup, 'json');

// 4. Migrate to QuickStore where appropriate
const sessions = await newDb.getCollection('sessions');
const allSessions = await sessions.getAll();

// Move active sessions to QuickStore
for (const session of allSessions) {
  if (session.active) {
    newDb.quickStore.add(`session_${session.userId}`, session);
    await sessions.delete(session._id);
  }
}

// 5. Update indexes for new architecture
const collections = newDb.listCollections();
for (const name of collections) {
  const coll = await newDb.getCollection(name);
  await coll.verifyIndexes();  // Self-healing verification
}

const migrationManager = new MigrationManager(db);

// Migration to add QuickStore references
migrationManager.addMigration({
  version: '0.7.0',
  name: 'Add QuickStore support',
  up: async (doc) => {
    if (doc.sessionId && !doc.quickStoreKey) {
      // Move session data to QuickStore
      db.quickStore.add(`session_${doc.sessionId}`, {
        userId: doc.userId,
        created: doc._created
      });
      return { ...doc, quickStoreKey: `session_${doc.sessionId}` };
    }
    return null;
  },
  down: async (doc) => {
    if (doc.quickStoreKey) {
      db.quickStore.delete(doc.quickStoreKey);
      const { quickStoreKey, ...rest } = doc;
      return rest;
    }
    return null;
  }
});

await migrationManager.runMigrations('0.7.0');

// 1. Monitor QuickStore usage
console.log(`QuickStore entries: ${db.quickStore.size}`);

// 2. Implement rotation policy
function rotateQuickStore(maxEntries = 100) {
  const all = db.quickStore.getAll();
  if (all.length > maxEntries) {
    const toDelete = all
      .sort((a, b) => a._modified - b._modified)
      .slice(0, all.length - maxEntries);
    
    toDelete.forEach(doc => db.quickStore.delete(doc._id));
  }
}

// 3. Move to collections for larger data
if (data.length > 1000) {  // Large dataset
  await collection.add(data);
} else {
  db.quickStore.add('small_data', data);
}

// 1. Use batch operations
await users.batchAdd(documents);  // Single transaction

// 2. Implement operation queuing
class OperationQueue {
  constructor(concurrency = 10) {
    this.queue = [];
    this.running = 0;
    this.concurrency = concurrency;
  }
  
  async add(operation) {
    if (this.running >= this.concurrency) {
      await new Promise(resolve => this.queue.push(resolve));
    }
    this.running++;
    try {
      return await operation();
    } finally {
      this.running--;
      if (this.queue.length > 0) {
        this.queue.shift()();
      }
    }
  }
}

// 1. Proper cleanup in destroy methods
class Collection {
  destroy() {
    clearInterval(this._cleanupInterval);
    this._events.clear();
    this._cacheStrategy = null;
    this._indexManager = null;
    // Release connection
    if (this._db) {
      connectionPool.releaseConnection(this.database.name);
    }
  }
}

// 2. WeakMap for external references
const privateData = new WeakMap();
privateData.set(instance, { sensitive: 'data' });