/**
 * Unit tests for HedgingManager
 */

import { HedgingManager } from '../../src/core/HedgingManager';
import { HedgingSessionRequest, HedgingSession } from '../../src/types/hedging';
import { Logger } from '../../src/utils/Logger';

// Mock dependencies
jest.mock('../../src/utils/Logger');
jest.mock('../../src/core/RiskManager');
jest.mock('../../src/core/OrderCoordinator');
jest.mock('../../src/core/HedgingStrategyEngine');
jest.mock('../../src/core/HedgingConfigManager');

describe('HedgingManager', () => {
  let hedgingManager: HedgingManager;
  let mockConfig: any;

  beforeEach(() => {
    mockConfig = {
      maxConcurrentSessions: 5,
      sessionTimeout: 60000,
      riskCheckInterval: 1000
    };

    hedgingManager = new HedgingManager(mockConfig);
  });

  afterEach(() => {
    jest.clearAllMocks();
  });

  describe('Initialization', () => {
    it('should initialize with correct configuration', async () => {
      await hedgingManager.initialize();
      
      const status = hedgingManager.getStatus();
      expect(status.isRunning).toBe(false);
      expect(status.totalSessions).toBe(0);
    });

    it('should throw error if already initialized', async () => {
      await hedgingManager.initialize();
      
      await expect(hedgingManager.initialize()).rejects.toThrow('HedgingManager is already initialized');
    });
  });

  describe('Session Management', () => {
    beforeEach(async () => {
      await hedgingManager.initialize();
    });

    it('should create a new hedging session', async () => {
      const sessionRequest: HedgingSessionRequest = {
        strategy: {
          symbol: 'ETH/USD',
          volumeDistribution: 'equal',
          priceRange: { min: 0.001, max: 0.01 },
          timing: { minInterval: 30, maxInterval: 120, orderSize: { min: 100, max: 500 } },
          riskLimits: { maxPositionSize: 0.1, stopLossThreshold: 0.05, maxSlippage: 0.02 },
          orderTypes: { primary: 'limit', fallback: 'market' }
        },
        accounts: ['account1', 'account2'],
        duration: 300000
      };

      const session = await hedgingManager.createSession(sessionRequest);
      
      expect(session).toBeDefined();
      expect(session.id).toBeDefined();
      expect(session.status).toBe('created');
      expect(session.strategy.symbol).toBe('ETH/USD');
      expect(session.accounts).toEqual(['account1', 'account2']);
    });

    it('should throw error when creating session with invalid request', async () => {
      const invalidRequest = {
        strategy: {
          symbol: '', // Invalid empty symbol
          volumeDistribution: 'equal',
          priceRange: { min: 0.001, max: 0.01 },
          timing: { minInterval: 30, maxInterval: 120, orderSize: { min: 100, max: 500 } },
          riskLimits: { maxPositionSize: 0.1, stopLossThreshold: 0.05, maxSlippage: 0.02 },
          orderTypes: { primary: 'limit', fallback: 'market' }
        },
        accounts: [],
        duration: 300000
      } as HedgingSessionRequest;

      await expect(hedgingManager.createSession(invalidRequest)).rejects.toThrow();
    });

    it('should start a hedging session', async () => {
      const sessionRequest: HedgingSessionRequest = {
        strategy: {
          symbol: 'ETH/USD',
          volumeDistribution: 'equal',
          priceRange: { min: 0.001, max: 0.01 },
          timing: { minInterval: 30, maxInterval: 120, orderSize: { min: 100, max: 500 } },
          riskLimits: { maxPositionSize: 0.1, stopLossThreshold: 0.05, maxSlippage: 0.02 },
          orderTypes: { primary: 'limit', fallback: 'market' }
        },
        accounts: ['account1', 'account2'],
        duration: 300000
      };

      const session = await hedgingManager.createSession(sessionRequest);
      await hedgingManager.startSession(session.id);
      
      const updatedSession = hedgingManager.getSession(session.id);
      expect(updatedSession?.status).toBe('running');
    });

    it('should pause a running session', async () => {
      const sessionRequest: HedgingSessionRequest = {
        strategy: {
          symbol: 'ETH/USD',
          volumeDistribution: 'equal',
          priceRange: { min: 0.001, max: 0.01 },
          timing: { minInterval: 30, maxInterval: 120, orderSize: { min: 100, max: 500 } },
          riskLimits: { maxPositionSize: 0.1, stopLossThreshold: 0.05, maxSlippage: 0.02 },
          orderTypes: { primary: 'limit', fallback: 'market' }
        },
        accounts: ['account1', 'account2'],
        duration: 300000
      };

      const session = await hedgingManager.createSession(sessionRequest);
      await hedgingManager.startSession(session.id);
      await hedgingManager.pauseSession(session.id);
      
      const updatedSession = hedgingManager.getSession(session.id);
      expect(updatedSession?.status).toBe('paused');
    });

    it('should resume a paused session', async () => {
      const sessionRequest: HedgingSessionRequest = {
        strategy: {
          symbol: 'ETH/USD',
          volumeDistribution: 'equal',
          priceRange: { min: 0.001, max: 0.01 },
          timing: { minInterval: 30, maxInterval: 120, orderSize: { min: 100, max: 500 } },
          riskLimits: { maxPositionSize: 0.1, stopLossThreshold: 0.05, maxSlippage: 0.02 },
          orderTypes: { primary: 'limit', fallback: 'market' }
        },
        accounts: ['account1', 'account2'],
        duration: 300000
      };

      const session = await hedgingManager.createSession(sessionRequest);
      await hedgingManager.startSession(session.id);
      await hedgingManager.pauseSession(session.id);
      await hedgingManager.resumeSession(session.id);
      
      const updatedSession = hedgingManager.getSession(session.id);
      expect(updatedSession?.status).toBe('running');
    });

    it('should stop a session', async () => {
      const sessionRequest: HedgingSessionRequest = {
        strategy: {
          symbol: 'ETH/USD',
          volumeDistribution: 'equal',
          priceRange: { min: 0.001, max: 0.01 },
          timing: { minInterval: 30, maxInterval: 120, orderSize: { min: 100, max: 500 } },
          riskLimits: { maxPositionSize: 0.1, stopLossThreshold: 0.05, maxSlippage: 0.02 },
          orderTypes: { primary: 'limit', fallback: 'market' }
        },
        accounts: ['account1', 'account2'],
        duration: 300000
      };

      const session = await hedgingManager.createSession(sessionRequest);
      await hedgingManager.startSession(session.id);
      await hedgingManager.stopSession(session.id);
      
      const updatedSession = hedgingManager.getSession(session.id);
      expect(updatedSession?.status).toBe('stopped');
    });

    it('should throw error when operating on non-existent session', async () => {
      await expect(hedgingManager.startSession('non-existent')).rejects.toThrow();
      await expect(hedgingManager.pauseSession('non-existent')).rejects.toThrow();
      await expect(hedgingManager.resumeSession('non-existent')).rejects.toThrow();
      await expect(hedgingManager.stopSession('non-existent')).rejects.toThrow();
    });

    it('should throw error when starting already running session', async () => {
      const sessionRequest: HedgingSessionRequest = {
        strategy: {
          symbol: 'ETH/USD',
          volumeDistribution: 'equal',
          priceRange: { min: 0.001, max: 0.01 },
          timing: { minInterval: 30, maxInterval: 120, orderSize: { min: 100, max: 500 } },
          riskLimits: { maxPositionSize: 0.1, stopLossThreshold: 0.05, maxSlippage: 0.02 },
          orderTypes: { primary: 'limit', fallback: 'market' }
        },
        accounts: ['account1', 'account2'],
        duration: 300000
      };

      const session = await hedgingManager.createSession(sessionRequest);
      await hedgingManager.startSession(session.id);
      
      await expect(hedgingManager.startSession(session.id)).rejects.toThrow();
    });
  });

  describe('Session Retrieval', () => {
    beforeEach(async () => {
      await hedgingManager.initialize();
    });

    it('should get all sessions', async () => {
      const sessionRequest: HedgingSessionRequest = {
        strategy: {
          symbol: 'ETH/USD',
          volumeDistribution: 'equal',
          priceRange: { min: 0.001, max: 0.01 },
          timing: { minInterval: 30, maxInterval: 120, orderSize: { min: 100, max: 500 } },
          riskLimits: { maxPositionSize: 0.1, stopLossThreshold: 0.05, maxSlippage: 0.02 },
          orderTypes: { primary: 'limit', fallback: 'market' }
        },
        accounts: ['account1', 'account2'],
        duration: 300000
      };

      const session1 = await hedgingManager.createSession(sessionRequest);
      const session2 = await hedgingManager.createSession(sessionRequest);
      
      const allSessions = hedgingManager.getAllSessions();
      expect(allSessions).toHaveLength(2);
      expect(allSessions.map(s => s.id)).toContain(session1.id);
      expect(allSessions.map(s => s.id)).toContain(session2.id);
    });

    it('should get session by ID', async () => {
      const sessionRequest: HedgingSessionRequest = {
        strategy: {
          symbol: 'ETH/USD',
          volumeDistribution: 'equal',
          priceRange: { min: 0.001, max: 0.01 },
          timing: { minInterval: 30, maxInterval: 120, orderSize: { min: 100, max: 500 } },
          riskLimits: { maxPositionSize: 0.1, stopLossThreshold: 0.05, maxSlippage: 0.02 },
          orderTypes: { primary: 'limit', fallback: 'market' }
        },
        accounts: ['account1', 'account2'],
        duration: 300000
      };

      const session = await hedgingManager.createSession(sessionRequest);
      const retrievedSession = hedgingManager.getSession(session.id);
      
      expect(retrievedSession).toBeDefined();
      expect(retrievedSession?.id).toBe(session.id);
    });

    it('should return null for non-existent session', () => {
      const session = hedgingManager.getSession('non-existent');
      expect(session).toBeNull();
    });
  });

  describe('Order Management', () => {
    beforeEach(async () => {
      await hedgingManager.initialize();
    });

    it('should get session orders', async () => {
      const sessionRequest: HedgingSessionRequest = {
        strategy: {
          symbol: 'ETH/USD',
          volumeDistribution: 'equal',
          priceRange: { min: 0.001, max: 0.01 },
          timing: { minInterval: 30, maxInterval: 120, orderSize: { min: 100, max: 500 } },
          riskLimits: { maxPositionSize: 0.1, stopLossThreshold: 0.05, maxSlippage: 0.02 },
          orderTypes: { primary: 'limit', fallback: 'market' }
        },
        accounts: ['account1', 'account2'],
        duration: 300000
      };

      const session = await hedgingManager.createSession(sessionRequest);
      const orders = hedgingManager.getSessionOrders(session.id);
      
      expect(orders).toBeDefined();
      expect(Array.isArray(orders)).toBe(true);
    });

    it('should return empty array for non-existent session orders', () => {
      const orders = hedgingManager.getSessionOrders('non-existent');
      expect(orders).toEqual([]);
    });
  });

  describe('Risk Management', () => {
    beforeEach(async () => {
      await hedgingManager.initialize();
    });

    it('should get session risk status', async () => {
      const sessionRequest: HedgingSessionRequest = {
        strategy: {
          symbol: 'ETH/USD',
          volumeDistribution: 'equal',
          priceRange: { min: 0.001, max: 0.01 },
          timing: { minInterval: 30, maxInterval: 120, orderSize: { min: 100, max: 500 } },
          riskLimits: { maxPositionSize: 0.1, stopLossThreshold: 0.05, maxSlippage: 0.02 },
          orderTypes: { primary: 'limit', fallback: 'market' }
        },
        accounts: ['account1', 'account2'],
        duration: 300000
      };

      const session = await hedgingManager.createSession(sessionRequest);
      const riskStatus = hedgingManager.getSessionRiskStatus(session.id);
      
      expect(riskStatus).toBeDefined();
      expect(riskStatus.overallRisk).toBeDefined();
      expect(riskStatus.activeBreaches).toBeDefined();
      expect(riskStatus.acknowledgedBreaches).toBeDefined();
    });

    it('should get session risk breaches', async () => {
      const sessionRequest: HedgingSessionRequest = {
        strategy: {
          symbol: 'ETH/USD',
          volumeDistribution: 'equal',
          priceRange: { min: 0.001, max: 0.01 },
          timing: { minInterval: 30, maxInterval: 120, orderSize: { min: 100, max: 500 } },
          riskLimits: { maxPositionSize: 0.1, stopLossThreshold: 0.05, maxSlippage: 0.02 },
          orderTypes: { primary: 'limit', fallback: 'market' }
        },
        accounts: ['account1', 'account2'],
        duration: 300000
      };

      const session = await hedgingManager.createSession(sessionRequest);
      const breaches = hedgingManager.getSessionRiskBreaches(session.id);
      
      expect(breaches).toBeDefined();
      expect(Array.isArray(breaches)).toBe(true);
    });

    it('should acknowledge risk breach', async () => {
      const sessionRequest: HedgingSessionRequest = {
        strategy: {
          symbol: 'ETH/USD',
          volumeDistribution: 'equal',
          priceRange: { min: 0.001, max: 0.01 },
          timing: { minInterval: 30, maxInterval: 120, orderSize: { min: 100, max: 500 } },
          riskLimits: { maxPositionSize: 0.1, stopLossThreshold: 0.05, maxSlippage: 0.02 },
          orderTypes: { primary: 'limit', fallback: 'market' }
        },
        accounts: ['account1', 'account2'],
        duration: 300000
      };

      const session = await hedgingManager.createSession(sessionRequest);
      const breaches = hedgingManager.getSessionRiskBreaches(session.id);
      
      if (breaches.length > 0) {
        const breach = breaches[0];
        await hedgingManager.acknowledgeRiskBreach(session.id, breach.id);
        
        const updatedBreaches = hedgingManager.getSessionRiskBreaches(session.id);
        const updatedBreach = updatedBreaches.find(b => b.id === breach.id);
        expect(updatedBreach?.acknowledged).toBe(true);
      }
    });

    it('should throw error when acknowledging non-existent breach', async () => {
      const sessionRequest: HedgingSessionRequest = {
        strategy: {
          symbol: 'ETH/USD',
          volumeDistribution: 'equal',
          priceRange: { min: 0.001, max: 0.01 },
          timing: { minInterval: 30, maxInterval: 120, orderSize: { min: 100, max: 500 } },
          riskLimits: { maxPositionSize: 0.1, stopLossThreshold: 0.05, maxSlippage: 0.02 },
          orderTypes: { primary: 'limit', fallback: 'market' }
        },
        accounts: ['account1', 'account2'],
        duration: 300000
      };

      const session = await hedgingManager.createSession(sessionRequest);
      
      await expect(hedgingManager.acknowledgeRiskBreach(session.id, 'non-existent')).rejects.toThrow();
    });
  });

  describe('Lifecycle Management', () => {
    it('should start and stop the manager', async () => {
      await hedgingManager.initialize();
      
      await hedgingManager.start();
      const status = hedgingManager.getStatus();
      expect(status.isRunning).toBe(true);
      
      await hedgingManager.stop();
      const stoppedStatus = hedgingManager.getStatus();
      expect(stoppedStatus.isRunning).toBe(false);
    });

    it('should throw error when starting already running manager', async () => {
      await hedgingManager.initialize();
      await hedgingManager.start();
      
      await expect(hedgingManager.start()).rejects.toThrow();
    });

    it('should throw error when stopping non-running manager', async () => {
      await hedgingManager.initialize();
      
      await expect(hedgingManager.stop()).rejects.toThrow();
    });
  });

  describe('Status and Statistics', () => {
    beforeEach(async () => {
      await hedgingManager.initialize();
    });

    it('should return correct status', () => {
      const status = hedgingManager.getStatus();
      
      expect(status).toBeDefined();
      expect(typeof status.isRunning).toBe('boolean');
      expect(typeof status.totalSessions).toBe('number');
      expect(typeof status.activeSessions).toBe('number');
      expect(typeof status.pausedSessions).toBe('number');
      expect(typeof status.stoppedSessions).toBe('number');
    });

    it('should return correct statistics', () => {
      const stats = hedgingManager.getStatistics();
      
      expect(stats).toBeDefined();
      expect(typeof stats.totalSessions).toBe('number');
      expect(typeof stats.totalOrders).toBe('number');
      expect(typeof stats.totalVolume).toBe('number');
      expect(typeof stats.averageExecutionTime).toBe('number');
      expect(typeof stats.successRate).toBe('number');
    });
  });

  describe('Error Handling', () => {
    it('should handle initialization errors gracefully', async () => {
      const invalidConfig = {
        maxConcurrentSessions: -1, // Invalid negative value
        sessionTimeout: 60000,
        riskCheckInterval: 1000
      };

      const invalidManager = new HedgingManager(invalidConfig);
      
      await expect(invalidManager.initialize()).rejects.toThrow();
    });

    it('should handle session creation errors gracefully', async () => {
      await hedgingManager.initialize();
      
      const invalidRequest = {
        strategy: null, // Invalid null strategy
        accounts: ['account1'],
        duration: 300000
      } as any;

      await expect(hedgingManager.createSession(invalidRequest)).rejects.toThrow();
    });
  });

  describe('Event Emission', () => {
    beforeEach(async () => {
      await hedgingManager.initialize();
    });

    it('should emit session created event', async () => {
      const sessionRequest: HedgingSessionRequest = {
        strategy: {
          symbol: 'ETH/USD',
          volumeDistribution: 'equal',
          priceRange: { min: 0.001, max: 0.01 },
          timing: { minInterval: 30, maxInterval: 120, orderSize: { min: 100, max: 500 } },
          riskLimits: { maxPositionSize: 0.1, stopLossThreshold: 0.05, maxSlippage: 0.02 },
          orderTypes: { primary: 'limit', fallback: 'market' }
        },
        accounts: ['account1', 'account2'],
        duration: 300000
      };

      const eventSpy = jest.fn();
      hedgingManager.on('sessionCreated', eventSpy);
      
      await hedgingManager.createSession(sessionRequest);
      
      expect(eventSpy).toHaveBeenCalled();
    });

    it('should emit session started event', async () => {
      const sessionRequest: HedgingSessionRequest = {
        strategy: {
          symbol: 'ETH/USD',
          volumeDistribution: 'equal',
          priceRange: { min: 0.001, max: 0.01 },
          timing: { minInterval: 30, maxInterval: 120, orderSize: { min: 100, max: 500 } },
          riskLimits: { maxPositionSize: 0.1, stopLossThreshold: 0.05, maxSlippage: 0.02 },
          orderTypes: { primary: 'limit', fallback: 'market' }
        },
        accounts: ['account1', 'account2'],
        duration: 300000
      };

      const session = await hedgingManager.createSession(sessionRequest);
      
      const eventSpy = jest.fn();
      hedgingManager.on('sessionStarted', eventSpy);
      
      await hedgingManager.startSession(session.id);
      
      expect(eventSpy).toHaveBeenCalled();
    });
  });
});