/**
 * Integration tests for multi-account wash trading session
 * These tests MUST fail before implementation - TDD approach
 */

import request from 'supertest';
import { Express } from 'express';

// Mock Express app - this will fail until implementation
let app: Express;

describe('Multi-Account Wash Trading Session Integration Tests', () => {
  beforeAll(() => {
    // This will fail until we implement the API
    // app = require('../../src/app').default;
  });

  describe('Complete Wash Trading Session Flow', () => {
    it('should execute complete wash trading session with multiple accounts', async () => {
      // Step 1: Create accounts
      const accounts = [];
      for (let i = 1; i <= 3; i++) {
        const accountData = {
          name: `Test Account ${i}`,
          apiKey: `test-api-key-${i}`,
          privateKey: `test-private-key-${i}-32-characters-long`,
          address: `0x${i.toString().padStart(40, '0')}`
        };

        const response = await request(app)
          .post('/api/v1/accounts')
          .send(accountData)
          .expect(201);

        accounts.push(response.body.data);
      }

      // Step 2: Create wash trading session
      const sessionData = {
        name: 'Integration Test Session',
        strategyId: 'equal-volume-btc',
        accountIds: accounts.map(acc => acc.id),
        targetVolume: 1.0,
        duration: 60000 // 1 minute for testing
      };

      const sessionResponse = await request(app)
        .post('/api/v1/sessions')
        .send(sessionData)
        .expect(201);

      const session = sessionResponse.body.data;

      // Step 3: Start session
      await request(app)
        .post(`/api/v1/sessions/${session.id}/start`)
        .expect(200);

      // Step 4: Monitor session progress
      let attempts = 0;
      let sessionCompleted = false;
      
      while (attempts < 10 && !sessionCompleted) {
        const statusResponse = await request(app)
          .get(`/api/v1/sessions/${session.id}/status`)
          .expect(200);

        const status = statusResponse.body.data;
        
        if (status.status === 'completed' || status.status === 'failed') {
          sessionCompleted = true;
        }

        // Wait 1 second before next check
        await new Promise(resolve => setTimeout(resolve, 1000));
        attempts++;
      }

      // Step 5: Verify session completed successfully
      const finalStatusResponse = await request(app)
        .get(`/api/v1/sessions/${session.id}/status`)
        .expect(200);

      const finalStatus = finalStatusResponse.body.data;
      expect(finalStatus.status).toBe('completed');
      expect(finalStatus.currentVolume).toBeGreaterThan(0);

      // Step 6: Verify orders were created
      const ordersResponse = await request(app)
        .get(`/api/v1/sessions/${session.id}/orders`)
        .expect(200);

      expect(ordersResponse.body.data.orders.length).toBeGreaterThan(0);

      // Step 7: Verify position neutrality
      const positionsResponse = await request(app)
        .get('/api/v1/hedging/positions')
        .expect(200);

      const positions = positionsResponse.body.data;
      expect(positions.isNeutral).toBe(true);
      expect(positions.totalExposure).toBe(0);
    });

    it('should handle session failure gracefully', async () => {
      // Create session with invalid configuration
      const sessionData = {
        name: 'Failing Session',
        strategyId: 'invalid-strategy',
        accountIds: ['non-existent-account'],
        targetVolume: 1.0,
        duration: 30000
      };

      const sessionResponse = await request(app)
        .post('/api/v1/sessions')
        .send(sessionData)
        .expect(201);

      const session = sessionResponse.body.data;

      // Try to start session - should fail
      await request(app)
        .post(`/api/v1/sessions/${session.id}/start`)
        .expect(400);

      // Verify session status is failed
      const statusResponse = await request(app)
        .get(`/api/v1/sessions/${session.id}/status`)
        .expect(200);

      expect(statusResponse.body.data.status).toBe('failed');
    });

    it('should pause and resume session correctly', async () => {
      // Create and start session
      const sessionData = {
        name: 'Pause Resume Test Session',
        strategyId: 'equal-volume-btc',
        accountIds: ['account-1', 'account-2'],
        targetVolume: 0.5,
        duration: 120000
      };

      const sessionResponse = await request(app)
        .post('/api/v1/sessions')
        .send(sessionData)
        .expect(201);

      const session = sessionResponse.body.data;

      // Start session
      await request(app)
        .post(`/api/v1/sessions/${session.id}/start`)
        .expect(200);

      // Wait a bit
      await new Promise(resolve => setTimeout(resolve, 2000));

      // Pause session
      await request(app)
        .post(`/api/v1/sessions/${session.id}/pause`)
        .expect(200);

      // Verify session is paused
      const pausedStatusResponse = await request(app)
        .get(`/api/v1/sessions/${session.id}/status`)
        .expect(200);

      expect(pausedStatusResponse.body.data.status).toBe('paused');

      // Resume session
      await request(app)
        .post(`/api/v1/sessions/${session.id}/resume`)
        .expect(200);

      // Verify session is active again
      const resumedStatusResponse = await request(app)
        .get(`/api/v1/sessions/${session.id}/status`)
        .expect(200);

      expect(resumedStatusResponse.body.data.status).toBe('active');

      // Stop session
      await request(app)
        .post(`/api/v1/sessions/${session.id}/stop`)
        .expect(200);
    });

    it('should maintain position neutrality across all accounts', async () => {
      // Create session with multiple accounts
      const sessionData = {
        name: 'Neutrality Test Session',
        strategyId: 'equal-volume-btc',
        accountIds: ['account-1', 'account-2', 'account-3'],
        targetVolume: 0.3,
        duration: 30000
      };

      const sessionResponse = await request(app)
        .post('/api/v1/sessions')
        .send(sessionData)
        .expect(201);

      const session = sessionResponse.body.data;

      // Start and let it run
      await request(app)
        .post(`/api/v1/sessions/${session.id}/start`)
        .expect(200);

      // Wait for completion
      await new Promise(resolve => setTimeout(resolve, 35000));

      // Check position neutrality
      const positionsResponse = await request(app)
        .get('/api/v1/hedging/positions')
        .expect(200);

      const positions = positionsResponse.body.data;
      expect(positions.isNeutral).toBe(true);
      expect(positions.netPositions).toEqual({});
      expect(positions.totalExposure).toBe(0);
    });

    it('should handle concurrent sessions', async () => {
      // Create multiple sessions
      const sessions = [];
      for (let i = 1; i <= 3; i++) {
        const sessionData = {
          name: `Concurrent Session ${i}`,
          strategyId: 'equal-volume-btc',
          accountIds: ['account-1', 'account-2'],
          targetVolume: 0.1,
          duration: 20000
        };

        const sessionResponse = await request(app)
          .post('/api/v1/sessions')
          .send(sessionData)
          .expect(201);

        sessions.push(sessionResponse.body.data);
      }

      // Start all sessions
      for (const session of sessions) {
        await request(app)
          .post(`/api/v1/sessions/${session.id}/start`)
          .expect(200);
      }

      // Wait for completion
      await new Promise(resolve => setTimeout(resolve, 25000));

      // Verify all sessions completed
      for (const session of sessions) {
        const statusResponse = await request(app)
          .get(`/api/v1/sessions/${session.id}/status`)
          .expect(200);

        expect(['completed', 'failed']).toContain(statusResponse.body.data.status);
      }

      // Verify overall position neutrality
      const positionsResponse = await request(app)
        .get('/api/v1/hedging/positions')
        .expect(200);

      expect(positionsResponse.body.data.isNeutral).toBe(true);
    });
  });
});