import { afterEach, beforeEach, describe, expect, test } from 'bun:test';
import { handlerRegistry, QueueManager } from '../src';

// Suppress Redis connection errors in tests
process.on('unhandledRejection', (reason, promise) => {
  if (reason && typeof reason === 'object' && 'message' in reason) {
    const message = (reason as Error).message;
    if (
      message.includes('Connection is closed') ||
      message.includes('Connection is in monitoring mode')
    ) {
      return;
    }
  }
  console.error('Unhandled Rejection at:', promise, 'reason:', reason);
});

describe('QueueManager', () => {
  let queueManager: QueueManager;

  // Use local Redis/Dragonfly
  const redisConfig = {
    host: 'localhost',
    port: 6379,
    password: '',
    db: 0,
  };

  beforeEach(() => {
    handlerRegistry.clear();
  });

  afterEach(async () => {
    if (queueManager) {
      try {
        await Promise.race([
          queueManager.shutdown(),
          new Promise((_, reject) => setTimeout(() => reject(new Error('Shutdown timeout')), 3000)),
        ]);
      } catch (error) {
        console.warn('Shutdown error:', error.message);
      } finally {
        queueManager = null as any;
      }
    }

    handlerRegistry.clear();
    await new Promise(resolve => setTimeout(resolve, 100));
  });

  describe('Basic Operations', () => {
    test('should initialize queue manager', async () => {
      queueManager = new QueueManager({
        queueName: 'test-queue',
        redis: redisConfig,
        workers: 1,
        concurrency: 5,
      });

      await queueManager.initialize();
      expect(queueManager.queueName).toBe('test-queue');
    });

    test('should add and process a job', async () => {
      let processedPayload: any;

      // Register handler
      handlerRegistry.register('test-handler', {
        'test-operation': async payload => {
          processedPayload = payload;
          return { success: true, data: payload };
        },
      });

      queueManager = new QueueManager({
        queueName: 'test-queue',
        redis: redisConfig,
        workers: 1,
      });

      await queueManager.initialize();

      // Add job
      const job = await queueManager.add('test-job', {
        handler: 'test-handler',
        operation: 'test-operation',
        payload: { message: 'Hello, Queue!' },
      });

      expect(job.name).toBe('test-job');

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

      expect(processedPayload).toEqual({ message: 'Hello, Queue!' });
    });

    test('should handle missing handler gracefully', async () => {
      queueManager = new QueueManager({
        queueName: 'test-queue',
        redis: redisConfig,
        workers: 1,
      });

      await queueManager.initialize();

      const job = await queueManager.add('test-job', {
        handler: 'non-existent',
        operation: 'test-operation',
        payload: { test: true },
      });

      // Wait for job to fail
      await new Promise(resolve => setTimeout(resolve, 100));

      const failed = await job.isFailed();
      expect(failed).toBe(true);
    });

    test('should add multiple jobs in bulk', async () => {
      let processedCount = 0;

      handlerRegistry.register('bulk-handler', {
        process: async _payload => {
          processedCount++;
          return { processed: true };
        },
      });

      queueManager = new QueueManager({
        queueName: 'test-queue',
        redis: redisConfig,
        workers: 2,
        concurrency: 5,
      });

      await queueManager.initialize();

      const jobs = await queueManager.addBulk([
        {
          name: 'job1',
          data: { handler: 'bulk-handler', operation: 'process', payload: { id: 1 } },
        },
        {
          name: 'job2',
          data: { handler: 'bulk-handler', operation: 'process', payload: { id: 2 } },
        },
        {
          name: 'job3',
          data: { handler: 'bulk-handler', operation: 'process', payload: { id: 3 } },
        },
      ]);

      expect(jobs.length).toBe(3);

      // Wait for processing
      await new Promise(resolve => setTimeout(resolve, 200));

      expect(processedCount).toBe(3);
    });

    test('should get queue statistics', async () => {
      queueManager = new QueueManager({
        queueName: 'test-queue',
        redis: redisConfig,
        workers: 0, // No workers, jobs will stay in waiting
      });

      await queueManager.initialize();

      // Add some jobs
      await queueManager.add('job1', {
        handler: 'test',
        operation: 'test',
        payload: { id: 1 },
      });

      await queueManager.add('job2', {
        handler: 'test',
        operation: 'test',
        payload: { id: 2 },
      });

      const stats = await queueManager.getStats();

      expect(stats.waiting).toBe(2);
      expect(stats.active).toBe(0);
      expect(stats.completed).toBe(0);
      expect(stats.failed).toBe(0);
    });

    test('should pause and resume queue', async () => {
      let processedCount = 0;

      handlerRegistry.register('pause-test', {
        process: async () => {
          processedCount++;
          return { ok: true };
        },
      });

      queueManager = new QueueManager({
        queueName: 'test-queue',
        redis: redisConfig,
        workers: 1,
      });

      await queueManager.initialize();

      // Pause queue
      await queueManager.pause();

      // Add job while paused
      await queueManager.add('job1', {
        handler: 'pause-test',
        operation: 'process',
        payload: {},
      });

      // Wait a bit - job should not be processed
      await new Promise(resolve => setTimeout(resolve, 100));
      expect(processedCount).toBe(0);

      // Resume queue
      await queueManager.resume();

      // Wait for processing
      await new Promise(resolve => setTimeout(resolve, 100));
      expect(processedCount).toBe(1);
    });
  });

  describe('Scheduled Jobs', () => {
    test('should register and process scheduled jobs', async () => {
      let executionCount = 0;

      handlerRegistry.registerWithSchedule({
        name: 'scheduled-handler',
        operations: {
          'scheduled-task': async _payload => {
            executionCount++;
            return { executed: true, timestamp: Date.now() };
          },
        },
        scheduledJobs: [
          {
            type: 'test-schedule',
            operation: 'scheduled-task',
            payload: { test: true },
            cronPattern: '*/1 * * * * *', // Every second
            description: 'Test scheduled job',
          },
        ],
      });

      queueManager = new QueueManager({
        queueName: 'test-queue',
        redis: redisConfig,
        workers: 1,
        enableScheduledJobs: true,
      });

      await queueManager.initialize();

      // Wait for scheduled job to execute
      await new Promise(resolve => setTimeout(resolve, 2500));

      expect(executionCount).toBeGreaterThanOrEqual(2);
    });
  });

  describe('Error Handling', () => {
    test('should handle job errors with retries', async () => {
      let attemptCount = 0;

      handlerRegistry.register('retry-handler', {
        'failing-operation': async () => {
          attemptCount++;
          if (attemptCount < 3) {
            throw new Error(`Attempt ${attemptCount} failed`);
          }
          return { success: true };
        },
      });

      queueManager = new QueueManager({
        queueName: 'test-queue',
        redis: redisConfig,
        workers: 1,
        defaultJobOptions: {
          attempts: 3,
          backoff: {
            type: 'fixed',
            delay: 50,
          },
        },
      });

      await queueManager.initialize();

      const job = await queueManager.add('retry-job', {
        handler: 'retry-handler',
        operation: 'failing-operation',
        payload: {},
      });

      // Wait for retries
      await new Promise(resolve => setTimeout(resolve, 500));

      const completed = await job.isCompleted();
      expect(completed).toBe(true);
      expect(attemptCount).toBe(3);
    });
  });

  describe('Multiple Handlers', () => {
    test('should handle multiple handlers with different operations', async () => {
      const results: any[] = [];

      handlerRegistry.register('handler-a', {
        'operation-1': async payload => {
          results.push({ handler: 'a', op: '1', payload });
          return { handler: 'a', op: '1' };
        },
        'operation-2': async payload => {
          results.push({ handler: 'a', op: '2', payload });
          return { handler: 'a', op: '2' };
        },
      });

      handlerRegistry.register('handler-b', {
        'operation-1': async payload => {
          results.push({ handler: 'b', op: '1', payload });
          return { handler: 'b', op: '1' };
        },
      });

      queueManager = new QueueManager({
        queueName: 'test-queue',
        redis: redisConfig,
        workers: 2,
      });

      await queueManager.initialize();

      // Add jobs for different handlers
      await queueManager.addBulk([
        {
          name: 'job1',
          data: { handler: 'handler-a', operation: 'operation-1', payload: { id: 1 } },
        },
        {
          name: 'job2',
          data: { handler: 'handler-a', operation: 'operation-2', payload: { id: 2 } },
        },
        {
          name: 'job3',
          data: { handler: 'handler-b', operation: 'operation-1', payload: { id: 3 } },
        },
      ]);

      // Wait for processing
      await new Promise(resolve => setTimeout(resolve, 200));

      expect(results.length).toBe(3);
      expect(results).toContainEqual({ handler: 'a', op: '1', payload: { id: 1 } });
      expect(results).toContainEqual({ handler: 'a', op: '2', payload: { id: 2 } });
      expect(results).toContainEqual({ handler: 'b', op: '1', payload: { id: 3 } });
    });
  });
});