/**
 * Distribution Job Unit Tests
 *
 * Tests for the daily distribution job including:
 * - Processing active accounts
 * - Calculating returns based on product
 * - Applying performance fees
 * - Skipping negative return days
 * - Sending notifications
 * - Logging run summaries
 */

import { mockDb, createMockQueryResult, resetDatabaseMocks, createMockPoolClient } from '../../../../__tests__/mocks/database.mock';

// Mock database
jest.mock('../../../../shared/database', () => ({
  db: mockDb,
}));

// Mock logger
jest.mock('../../../../shared/utils/logger', () => ({
  logger: {
    info: jest.fn(),
    error: jest.fn(),
    warn: jest.fn(),
    debug: jest.fn(),
  },
}));

// Mock notification service
const mockSendDistributionNotification = jest.fn();
jest.mock('../../../notifications', () => ({
  notificationService: {
    sendDistributionNotification: mockSendDistributionNotification,
  },
}));

// Import after mocks
import { distributionJob } from '../distribution.job';

describe('DistributionJob', () => {
  const mockPoolClient = createMockPoolClient();

  beforeEach(() => {
    resetDatabaseMocks();
    mockSendDistributionNotification.mockClear();
    mockPoolClient.query.mockClear();
    jest.clearAllMocks();

    // Setup transaction mock
    mockDb.transaction.mockImplementation(async (callback) => {
      return callback(mockPoolClient);
    });
  });

  describe('run', () => {
    const mockAccounts = [
      {
        id: 'account-1',
        user_id: 'user-1',
        product_id: 'product-1',
        product_code: 'atlas',
        product_name: 'Atlas - El Guardián',
        account_number: 'ATL-001',
        current_balance: '10000.00',
        status: 'active',
      },
      {
        id: 'account-2',
        user_id: 'user-2',
        product_id: 'product-1',
        product_name: 'Atlas - El Guardián',
        product_code: 'atlas',
        account_number: 'ATL-002',
        current_balance: '25000.00',
        status: 'active',
      },
    ];

    const mockProducts = [
      {
        id: 'product-1',
        code: 'atlas',
        name: 'Atlas - El Guardián',
        target_return_min: '3.00',
        target_return_max: '5.00',
        performance_fee: '20.00',
      },
    ];

    it('should process all active accounts', async () => {
      // Mock queries
      mockDb.query
        // getActiveAccounts
        .mockResolvedValueOnce(createMockQueryResult(mockAccounts))
        // getProducts
        .mockResolvedValueOnce(createMockQueryResult(mockProducts))
        // logDistributionRun
        .mockResolvedValueOnce({ rowCount: 1 });

      // Mock transaction queries
      mockPoolClient.query
        // Lock account row
        .mockResolvedValueOnce(createMockQueryResult([{ current_balance: '10000.00' }]))
        // Update account balance
        .mockResolvedValueOnce({ rowCount: 1 })
        // Insert transaction
        .mockResolvedValueOnce({ rowCount: 1 })
        // Insert distribution history
        .mockResolvedValueOnce({ rowCount: 1 })
        // Lock account row (second account)
        .mockResolvedValueOnce(createMockQueryResult([{ current_balance: '25000.00' }]))
        // Update account balance
        .mockResolvedValueOnce({ rowCount: 1 })
        // Insert transaction
        .mockResolvedValueOnce({ rowCount: 1 })
        // Insert distribution history
        .mockResolvedValueOnce({ rowCount: 1 });

      mockSendDistributionNotification.mockResolvedValue(undefined);

      const summary = await distributionJob.run();

      expect(summary.totalAccounts).toBe(2);
      expect(mockDb.query).toHaveBeenCalledWith(
        expect.stringContaining('FROM investment.accounts'),
        expect.any(Array)
      );
    });

    it('should calculate correct returns based on product', async () => {
      // Use Math.random mock to control variance
      const originalRandom = Math.random;
      Math.random = jest.fn().mockReturnValue(0.5); // Will give variance = 0.1

      mockDb.query
        .mockResolvedValueOnce(createMockQueryResult([mockAccounts[0]]))
        .mockResolvedValueOnce(createMockQueryResult(mockProducts))
        .mockResolvedValueOnce({ rowCount: 1 });

      mockPoolClient.query
        .mockResolvedValueOnce(createMockQueryResult([{ current_balance: '10000.00' }]))
        .mockResolvedValueOnce({ rowCount: 1 })
        .mockResolvedValueOnce({ rowCount: 1 })
        .mockResolvedValueOnce({ rowCount: 1 });

      mockSendDistributionNotification.mockResolvedValue(undefined);

      await distributionJob.run();

      // Verify update was called with calculated amount
      expect(mockPoolClient.query).toHaveBeenCalledWith(
        expect.stringContaining('UPDATE investment.accounts'),
        expect.any(Array)
      );

      Math.random = originalRandom;
    });

    it('should apply performance fees', async () => {
      const originalRandom = Math.random;
      Math.random = jest.fn().mockReturnValue(0.5);

      mockDb.query
        .mockResolvedValueOnce(createMockQueryResult([mockAccounts[0]]))
        .mockResolvedValueOnce(createMockQueryResult(mockProducts))
        .mockResolvedValueOnce({ rowCount: 1 });

      mockPoolClient.query
        .mockResolvedValueOnce(createMockQueryResult([{ current_balance: '10000.00' }]))
        .mockResolvedValueOnce({ rowCount: 1 })
        .mockResolvedValueOnce({ rowCount: 1 })
        .mockResolvedValueOnce({ rowCount: 1 });

      mockSendDistributionNotification.mockResolvedValue(undefined);

      const summary = await distributionJob.run();

      // Check that fees were collected
      expect(summary.totalFees).toBeGreaterThanOrEqual(0);

      Math.random = originalRandom;
    });

    it('should skip negative return days', async () => {
      const originalRandom = Math.random;
      // Return value that causes negative returns (< 0.3)
      Math.random = jest.fn().mockReturnValue(0.1);

      mockDb.query
        .mockResolvedValueOnce(createMockQueryResult([mockAccounts[0]]))
        .mockResolvedValueOnce(createMockQueryResult(mockProducts))
        .mockResolvedValueOnce({ rowCount: 1 });

      const summary = await distributionJob.run();

      // No distributions should occur on negative days
      expect(mockPoolClient.query).not.toHaveBeenCalled();
      expect(summary.successfulDistributions).toBe(0);

      Math.random = originalRandom;
    });

    it('should send notifications to users', async () => {
      const originalRandom = Math.random;
      Math.random = jest.fn().mockReturnValue(0.5);

      mockDb.query
        .mockResolvedValueOnce(createMockQueryResult([mockAccounts[0]]))
        .mockResolvedValueOnce(createMockQueryResult(mockProducts))
        .mockResolvedValueOnce({ rowCount: 1 });

      mockPoolClient.query
        .mockResolvedValueOnce(createMockQueryResult([{ current_balance: '10000.00' }]))
        .mockResolvedValueOnce({ rowCount: 1 })
        .mockResolvedValueOnce({ rowCount: 1 })
        .mockResolvedValueOnce({ rowCount: 1 });

      mockSendDistributionNotification.mockResolvedValue(undefined);

      await distributionJob.run();

      expect(mockSendDistributionNotification).toHaveBeenCalledWith(
        'user-1',
        expect.objectContaining({
          productName: 'Atlas - El Guardián',
          accountNumber: 'ATL-001',
        })
      );

      Math.random = originalRandom;
    });

    it('should log run summary', async () => {
      const originalRandom = Math.random;
      Math.random = jest.fn().mockReturnValue(0.5);

      mockDb.query
        .mockResolvedValueOnce(createMockQueryResult([mockAccounts[0]]))
        .mockResolvedValueOnce(createMockQueryResult(mockProducts))
        .mockResolvedValueOnce({ rowCount: 1 });

      mockPoolClient.query
        .mockResolvedValueOnce(createMockQueryResult([{ current_balance: '10000.00' }]))
        .mockResolvedValueOnce({ rowCount: 1 })
        .mockResolvedValueOnce({ rowCount: 1 })
        .mockResolvedValueOnce({ rowCount: 1 });

      mockSendDistributionNotification.mockResolvedValue(undefined);

      await distributionJob.run();

      expect(mockDb.query).toHaveBeenCalledWith(
        expect.stringContaining('INSERT INTO investment.distribution_runs'),
        expect.any(Array)
      );

      Math.random = originalRandom;
    });

    it('should handle account not found during distribution', async () => {
      const originalRandom = Math.random;
      Math.random = jest.fn().mockReturnValue(0.5);

      mockDb.query
        .mockResolvedValueOnce(createMockQueryResult([mockAccounts[0]]))
        .mockResolvedValueOnce(createMockQueryResult(mockProducts))
        .mockResolvedValueOnce({ rowCount: 1 });

      mockPoolClient.query
        // Lock returns empty (account was deleted)
        .mockResolvedValueOnce(createMockQueryResult([]));

      mockDb.transaction.mockImplementation(async (callback) => {
        try {
          return await callback(mockPoolClient);
        } catch (error) {
          throw error;
        }
      });

      const summary = await distributionJob.run();

      expect(summary.failedDistributions).toBe(1);

      Math.random = originalRandom;
    });

    it('should handle product not found for account', async () => {
      mockDb.query
        .mockResolvedValueOnce(createMockQueryResult([{
          ...mockAccounts[0],
          product_id: 'non-existent-product',
        }]))
        .mockResolvedValueOnce(createMockQueryResult(mockProducts))
        .mockResolvedValueOnce({ rowCount: 1 });

      const summary = await distributionJob.run();

      expect(summary.failedDistributions).toBe(1);
    });

    it('should not process if no active accounts', async () => {
      mockDb.query.mockResolvedValueOnce(createMockQueryResult([]));

      const summary = await distributionJob.run();

      expect(summary.totalAccounts).toBe(0);
      expect(summary.successfulDistributions).toBe(0);
    });

    it('should prevent concurrent runs', async () => {
      // Start first run
      mockDb.query
        .mockResolvedValueOnce(createMockQueryResult(mockAccounts))
        .mockImplementationOnce(() => new Promise(resolve => setTimeout(() => {
          resolve(createMockQueryResult(mockProducts));
        }, 100)));

      const firstRun = distributionJob.run();

      // Attempt second run immediately
      await expect(distributionJob.run()).rejects.toThrow('Distribution already in progress');

      // Let first run complete
      mockDb.query.mockResolvedValue({ rowCount: 1 });
      mockPoolClient.query.mockResolvedValue(createMockQueryResult([{ current_balance: '10000.00' }]));

      await firstRun;
    });
  });

  describe('getStatus', () => {
    it('should return running state', () => {
      const status = distributionJob.getStatus();

      expect(status).toHaveProperty('isRunning');
      expect(status).toHaveProperty('lastRunAt');
      expect(status).toHaveProperty('isScheduled');
    });

    it('should return last run time after successful run', async () => {
      mockDb.query
        .mockResolvedValueOnce(createMockQueryResult([]))
        .mockResolvedValueOnce({ rowCount: 1 });

      await distributionJob.run();

      const status = distributionJob.getStatus();
      expect(status.lastRunAt).toBeDefined();
    });
  });

  describe('start/stop', () => {
    beforeEach(() => {
      jest.useFakeTimers();
    });

    afterEach(() => {
      distributionJob.stop();
      jest.useRealTimers();
    });

    it('should schedule job for midnight UTC', () => {
      distributionJob.start();

      const status = distributionJob.getStatus();
      expect(status.isScheduled).toBe(true);
    });

    it('should stop scheduled job', () => {
      distributionJob.start();
      distributionJob.stop();

      const status = distributionJob.getStatus();
      expect(status.isScheduled).toBe(false);
    });
  });
});