import type { Redis, Cluster } from 'ioredis';

/**
 * Integration tests for GenerationJobManager.
 *
 * Tests the job manager with both in-memory and Redis backends
 * to ensure consistent behavior across deployment modes.
 *
 * Run with: USE_REDIS=true npx jest GenerationJobManager.stream_integration
 */
describe('GenerationJobManager Integration Tests', () => {
  let originalEnv: NodeJS.ProcessEnv;
  let ioredisClient: Redis | Cluster | null = null;
  const testPrefix = 'JobManager-Integration-Test';

  beforeAll(async () => {
    originalEnv = { ...process.env };

    // Set up test environment
    process.env.USE_REDIS = process.env.USE_REDIS ?? 'true';
    process.env.REDIS_URI = process.env.REDIS_URI ?? 'redis://127.0.0.1:6379';
    process.env.REDIS_KEY_PREFIX = testPrefix;

    jest.resetModules();

    const { ioredisClient: client } = await import('../../cache/redisClients');
    ioredisClient = client;
  });

  afterEach(async () => {
    // Clean up module state
    jest.resetModules();

    // Clean up Redis keys (delete individually for cluster compatibility)
    if (ioredisClient) {
      try {
        const keys = await ioredisClient.keys(`${testPrefix}*`);
        const streamKeys = await ioredisClient.keys(`stream:*`);
        const allKeys = [...keys, ...streamKeys];
        await Promise.all(allKeys.map((key) => ioredisClient!.del(key)));
      } catch {
        // Ignore cleanup errors
      }
    }
  });

  afterAll(async () => {
    if (ioredisClient && 'disconnect' in ioredisClient) {
      try {
        ioredisClient.disconnect();
      } catch {
        // Ignore disconnect errors
      }
    }
    process.env = originalEnv;
  });

  describe('In-Memory Mode', () => {
    test('should create and manage jobs', async () => {
      const { GenerationJobManager } = await import('../GenerationJobManager');
      const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
      const { InMemoryEventTransport } = await import('../implementations/InMemoryEventTransport');

      // Configure with in-memory
      // cleanupOnComplete: false so we can verify completed status
      GenerationJobManager.configure({
        jobStore: new InMemoryJobStore({ ttlAfterComplete: 60000 }),
        eventTransport: new InMemoryEventTransport(),
        isRedis: false,
        cleanupOnComplete: false,
      });

      await GenerationJobManager.initialize();

      const streamId = `inmem-job-${Date.now()}`;
      const userId = 'test-user-1';

      // Create job (async)
      const job = await GenerationJobManager.createJob(streamId, userId);
      expect(job.streamId).toBe(streamId);
      expect(job.status).toBe('running');

      // Check job exists
      const hasJob = await GenerationJobManager.hasJob(streamId);
      expect(hasJob).toBe(true);

      // Get job
      const retrieved = await GenerationJobManager.getJob(streamId);
      expect(retrieved?.streamId).toBe(streamId);

      // Update job
      await GenerationJobManager.updateMetadata(streamId, { sender: 'TestAgent' });
      const updated = await GenerationJobManager.getJob(streamId);
      expect(updated?.metadata?.sender).toBe('TestAgent');

      // Complete job
      await GenerationJobManager.completeJob(streamId);
      const completed = await GenerationJobManager.getJob(streamId);
      expect(completed?.status).toBe('complete');

      await GenerationJobManager.destroy();
    });

    test('should handle event streaming', async () => {
      const { GenerationJobManager } = await import('../GenerationJobManager');
      const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
      const { InMemoryEventTransport } = await import('../implementations/InMemoryEventTransport');

      GenerationJobManager.configure({
        jobStore: new InMemoryJobStore({ ttlAfterComplete: 60000 }),
        eventTransport: new InMemoryEventTransport(),
        isRedis: false,
      });

      await GenerationJobManager.initialize();

      const streamId = `inmem-events-${Date.now()}`;
      await GenerationJobManager.createJob(streamId, 'user-1');

      const receivedChunks: unknown[] = [];

      // Subscribe to events (subscribe takes separate args, not an object)
      const subscription = await GenerationJobManager.subscribe(streamId, (event) =>
        receivedChunks.push(event),
      );
      const { unsubscribe } = subscription!;

      // Wait for first subscriber to be registered
      await new Promise((resolve) => setTimeout(resolve, 10));

      // Emit chunks (emitChunk takes { event, data } format)
      GenerationJobManager.emitChunk(streamId, {
        event: 'on_message_delta',
        data: { type: 'text', text: 'Hello' },
      });
      GenerationJobManager.emitChunk(streamId, {
        event: 'on_message_delta',
        data: { type: 'text', text: ' world' },
      });

      // Give time for events to propagate
      await new Promise((resolve) => setTimeout(resolve, 50));

      // Verify chunks were received
      expect(receivedChunks.length).toBeGreaterThan(0);

      // Complete the job (this cleans up resources)
      await GenerationJobManager.completeJob(streamId);

      unsubscribe();
      await GenerationJobManager.destroy();
    });
  });

  describe('Redis Mode', () => {
    test('should create and manage jobs via Redis', async () => {
      if (!ioredisClient) {
        console.warn('Redis not available, skipping test');
        return;
      }

      const { GenerationJobManager } = await import('../GenerationJobManager');
      const { createStreamServices } = await import('../createStreamServices');

      // Create Redis services
      const services = createStreamServices({
        useRedis: true,
        redisClient: ioredisClient,
      });

      expect(services.isRedis).toBe(true);

      GenerationJobManager.configure(services);
      await GenerationJobManager.initialize();

      const streamId = `redis-job-${Date.now()}`;
      const userId = 'test-user-redis';

      // Create job (async)
      const job = await GenerationJobManager.createJob(streamId, userId);
      expect(job.streamId).toBe(streamId);

      // Verify in Redis
      const hasJob = await GenerationJobManager.hasJob(streamId);
      expect(hasJob).toBe(true);

      // Update and verify
      await GenerationJobManager.updateMetadata(streamId, { sender: 'RedisAgent' });
      const updated = await GenerationJobManager.getJob(streamId);
      expect(updated?.metadata?.sender).toBe('RedisAgent');

      await GenerationJobManager.destroy();
    });

    test('should persist chunks for cross-instance resume', async () => {
      if (!ioredisClient) {
        console.warn('Redis not available, skipping test');
        return;
      }

      const { GenerationJobManager } = await import('../GenerationJobManager');
      const { createStreamServices } = await import('../createStreamServices');

      const services = createStreamServices({
        useRedis: true,
        redisClient: ioredisClient,
      });

      GenerationJobManager.configure(services);
      await GenerationJobManager.initialize();

      const streamId = `redis-chunks-${Date.now()}`;
      await GenerationJobManager.createJob(streamId, 'user-1');

      // Emit chunks (these should be persisted to Redis)
      // emitChunk takes { event, data } format
      GenerationJobManager.emitChunk(streamId, {
        event: 'on_run_step',
        data: {
          id: 'step-1',
          runId: 'run-1',
          index: 0,
          stepDetails: { type: 'message_creation' },
        },
      });
      GenerationJobManager.emitChunk(streamId, {
        event: 'on_message_delta',
        data: {
          id: 'step-1',
          delta: { content: { type: 'text', text: 'Persisted ' } },
        },
      });
      GenerationJobManager.emitChunk(streamId, {
        event: 'on_message_delta',
        data: {
          id: 'step-1',
          delta: { content: { type: 'text', text: 'content' } },
        },
      });

      // Wait for async operations
      await new Promise((resolve) => setTimeout(resolve, 100));

      // Simulate getting resume state (as if from different instance)
      const resumeState = await GenerationJobManager.getResumeState(streamId);

      expect(resumeState).not.toBeNull();
      expect(resumeState!.aggregatedContent?.length).toBeGreaterThan(0);

      await GenerationJobManager.destroy();
    });

    test('should handle abort and return content', async () => {
      if (!ioredisClient) {
        console.warn('Redis not available, skipping test');
        return;
      }

      const { GenerationJobManager } = await import('../GenerationJobManager');
      const { createStreamServices } = await import('../createStreamServices');

      const services = createStreamServices({
        useRedis: true,
        redisClient: ioredisClient,
      });

      GenerationJobManager.configure(services);
      await GenerationJobManager.initialize();

      const streamId = `redis-abort-${Date.now()}`;
      await GenerationJobManager.createJob(streamId, 'user-1');

      // Emit some content (emitChunk takes { event, data } format)
      GenerationJobManager.emitChunk(streamId, {
        event: 'on_run_step',
        data: {
          id: 'step-1',
          runId: 'run-1',
          index: 0,
          stepDetails: { type: 'message_creation' },
        },
      });
      GenerationJobManager.emitChunk(streamId, {
        event: 'on_message_delta',
        data: {
          id: 'step-1',
          delta: { content: { type: 'text', text: 'Partial response...' } },
        },
      });

      await new Promise((resolve) => setTimeout(resolve, 100));

      // Abort the job
      const abortResult = await GenerationJobManager.abortJob(streamId);

      expect(abortResult.success).toBe(true);
      expect(abortResult.content.length).toBeGreaterThan(0);

      await GenerationJobManager.destroy();
    });
  });

  describe('Cross-Mode Consistency', () => {
    test('should have consistent API between in-memory and Redis modes', async () => {
      // This test verifies that the same operations work identically
      // regardless of backend mode

      const runTestWithMode = async (isRedis: boolean) => {
        jest.resetModules();

        const { GenerationJobManager } = await import('../GenerationJobManager');

        if (isRedis && ioredisClient) {
          const { createStreamServices } = await import('../createStreamServices');
          GenerationJobManager.configure({
            ...createStreamServices({
              useRedis: true,
              redisClient: ioredisClient,
            }),
            cleanupOnComplete: false, // Keep job for verification
          });
        } else {
          const { InMemoryJobStore } = await import('../implementations/InMemoryJobStore');
          const { InMemoryEventTransport } = await import(
            '../implementations/InMemoryEventTransport'
          );
          GenerationJobManager.configure({
            jobStore: new InMemoryJobStore({ ttlAfterComplete: 60000 }),
            eventTransport: new InMemoryEventTransport(),
            isRedis: false,
            cleanupOnComplete: false,
          });
        }

        await GenerationJobManager.initialize();

        const streamId = `consistency-${isRedis ? 'redis' : 'inmem'}-${Date.now()}`;

        // Test sequence
        const job = await GenerationJobManager.createJob(streamId, 'user-1');
        expect(job.streamId).toBe(streamId);
        expect(job.status).toBe('running');

        const hasJob = await GenerationJobManager.hasJob(streamId);
        expect(hasJob).toBe(true);

        await GenerationJobManager.updateMetadata(streamId, {
          sender: 'ConsistencyAgent',
          responseMessageId: 'resp-123',
        });

        const updated = await GenerationJobManager.getJob(streamId);
        expect(updated?.metadata?.sender).toBe('ConsistencyAgent');
        expect(updated?.metadata?.responseMessageId).toBe('resp-123');

        await GenerationJobManager.completeJob(streamId);

        const completed = await GenerationJobManager.getJob(streamId);
        expect(completed?.status).toBe('complete');

        await GenerationJobManager.destroy();
      };

      // Test in-memory mode
      await runTestWithMode(false);

      // Test Redis mode if available
      if (ioredisClient) {
        await runTestWithMode(true);
      }
    });
  });

  describe('createStreamServices Auto-Detection', () => {
    test('should auto-detect Redis when USE_REDIS is true', async () => {
      if (!ioredisClient) {
        console.warn('Redis not available, skipping test');
        return;
      }

      // Force USE_REDIS to true
      process.env.USE_REDIS = 'true';
      jest.resetModules();

      const { createStreamServices } = await import('../createStreamServices');
      const services = createStreamServices();

      // Should detect Redis
      expect(services.isRedis).toBe(true);
    });

    test('should fall back to in-memory when USE_REDIS is false', async () => {
      process.env.USE_REDIS = 'false';
      jest.resetModules();

      const { createStreamServices } = await import('../createStreamServices');
      const services = createStreamServices();

      expect(services.isRedis).toBe(false);
    });

    test('should allow forcing in-memory via config override', async () => {
      const { createStreamServices } = await import('../createStreamServices');
      const services = createStreamServices({ useRedis: false });

      expect(services.isRedis).toBe(false);
    });
  });
});