const { describe, it, beforeEach, afterEach, before, after } = require('mocha');
const { expect } = require('chai');
const sinon = require('sinon');
const request = require('supertest');
const express = require('express');
const { setupTestEnvironment, teardownTestEnvironment, cleanDatabase, createTestUser, createTestTenant, createTestDevice, generateTestToken } = require('../setup');
const detectorsRoutes = require('../../routes/detectors');

describe('Detectors Routes', () => {
  let app, models, sequelize;

  before(async () => {
    ({ models, sequelize } = await setupTestEnvironment());
    
    // Setup express app for testing
    app = express();
    app.use(express.json());
    
    // Add mock Socket.io middleware for tests
    app.use((req, res, next) => {
      req.io = {
        emit: () => {}, // Mock emit function that does nothing
        emitToDashboard: () => {},
        emitToDevice: () => {}
      };
      next();
    });
    
    app.use('/detectors', detectorsRoutes);
  });

  after(async () => {
    await teardownTestEnvironment();
  });

  beforeEach(async () => {
    await cleanDatabase();
  });

  describe('POST /detectors - Detection Data', () => {
    it('should accept valid detection from approved device', async () => {
      const tenant = await createTestTenant();
      const device = await createTestDevice({
        id: 1941875381,
        tenant_id: tenant.id,
        is_approved: true,
        is_active: true
      });

      const detectionData = {
        device_id: device.id,
        geo_lat: 59.3293,
        geo_lon: 18.0686,
        device_timestamp: Date.now(),
        drone_type: 2,
        rssi: -65,
        freq: 2400,
        drone_id: 1001
      };

      const response = await request(app)
        .post('/detectors')
        .send(detectionData);

      expect(response.status).to.equal(201);
      expect(response.body.success).to.be.true;
      expect(response.body.message).to.equal('Detection processed successfully');
    });

    it('should reject detection from unknown device', async () => {
      const detectionData = {
        device_id: 999999999, // Non-existent device
        geo_lat: 59.3293,
        geo_lon: 18.0686,
        device_timestamp: Date.now(),
        drone_type: 2,
        rssi: -65,
        freq: 2400,
        drone_id: 1001
      };

      const response = await request(app)
        .post('/detectors')
        .send(detectionData);

      expect(response.status).to.equal(404);
      expect(response.body.success).to.be.false;
      expect(response.body.error).to.equal('Device not registered');
      expect(response.body.registration_required).to.be.true;
    });

    it('should reject detection from unapproved device', async () => {
      const device = await createTestDevice({
        id: 1941875381,
        is_approved: false,
        is_active: true
      });

      const detectionData = {
        device_id: device.id,
        geo_lat: 59.3293,
        geo_lon: 18.0686,
        device_timestamp: Date.now(),
        drone_type: 2,
        rssi: -65,
        freq: 2400,
        drone_id: 1001
      };

      const response = await request(app)
        .post('/detectors')
        .send(detectionData);

      expect(response.status).to.equal(403);
      expect(response.body.success).to.be.false;
      expect(response.body.error).to.equal('Device not approved');
      expect(response.body.approval_required).to.be.true;
    });

    it('should handle drone type 0 (None) detections when debug enabled', async () => {
      process.env.STORE_DRONE_TYPE0 = 'true';
      
      const device = await createTestDevice({
        is_approved: true,
        is_active: true
      });

      const detectionData = {
        device_id: device.id,
        geo_lat: 59.3293,
        geo_lon: 18.0686,
        device_timestamp: Date.now(),
        drone_type: 0, // None type
        rssi: -65,
        freq: 2400,
        drone_id: 1001
      };

      const response = await request(app)
        .post('/detectors')
        .send(detectionData);

      expect(response.status).to.equal(201);
      expect(response.body.success).to.be.true;
      
      delete process.env.STORE_DRONE_TYPE0;
    });

    it('should skip drone type 0 detections when debug disabled', async () => {
      process.env.STORE_DRONE_TYPE0 = 'false';
      
      const device = await createTestDevice({
        is_approved: true,
        is_active: true
      });

      const detectionData = {
        device_id: device.id,
        geo_lat: 59.3293,
        geo_lon: 18.0686,
        device_timestamp: Date.now(),
        drone_type: 0,
        rssi: -65,
        freq: 2400,
        drone_id: 1001
      };

      const response = await request(app)
        .post('/detectors')
        .send(detectionData);

      expect(response.status).to.equal(200);
      expect(response.body.success).to.be.true;
      expect(response.body.message).to.include('debug mode');
      
      delete process.env.STORE_DRONE_TYPE0;
    });

    it('should validate required detection fields', async () => {
      const device = await createTestDevice({ is_approved: true });

      const invalidData = {
        device_id: device.id,
        // missing required fields
        geo_lat: 59.3293
      };

      const response = await request(app)
        .post('/detectors')
        .send(invalidData);

      expect(response.status).to.equal(400);
      expect(response.body.success).to.be.false;
    });

    it('should validate coordinate ranges', async () => {
      const device = await createTestDevice({ is_approved: true });

      const invalidData = {
        device_id: device.id,
        geo_lat: 91, // Invalid latitude
        geo_lon: 181, // Invalid longitude
        device_timestamp: Date.now(),
        drone_type: 2,
        rssi: -65,
        freq: 2400,
        drone_id: 1001
      };

      const response = await request(app)
        .post('/detectors')
        .send(invalidData);

      expect(response.status).to.equal(400);
      expect(response.body.success).to.be.false;
    });

    it('should trigger alerts for critical detections', async () => {
      const device = await createTestDevice({ is_approved: true });

      const criticalDetection = {
        device_id: device.id,
        geo_lat: 59.3293,
        geo_lon: 18.0686,
        device_timestamp: Date.now(),
        drone_type: 2, // Orlan - military drone
        rssi: -35, // Strong signal = close proximity
        freq: 2400,
        drone_id: 1001
      };

      const response = await request(app)
        .post('/detectors')
        .send(criticalDetection);

      expect(response.status).to.equal(201);
      expect(response.body.success).to.be.true;
    });

    it('should handle detection with optional fields', async () => {
      const device = await createTestDevice({ is_approved: true });

      const detectionData = {
        device_id: device.id,
        geo_lat: 59.3293,
        geo_lon: 18.0686,
        device_timestamp: Date.now(),
        drone_type: 2,
        rssi: -65,
        freq: 2400,
        drone_id: 1001,
        confidence_level: 0.85,
        signal_duration: 2500
      };

      const response = await request(app)
        .post('/detectors')
        .send(detectionData);

      expect(response.status).to.equal(201);
      expect(response.body.success).to.be.true;
    });
  });

  describe('POST /detectors - Heartbeat Data', () => {
    it('should accept valid heartbeat', async () => {
      const heartbeatData = {
        type: 'heartbeat',
        key: 'device_123_key',
        device_id: 123,
        geo_lat: 59.3293,
        geo_lon: 18.0686
      };

      const response = await request(app)
        .post('/detectors')
        .send(heartbeatData);

      expect(response.status).to.equal(200);
      expect(response.body.success).to.be.true;
      expect(response.body.message).to.equal('Heartbeat received');
    });

    it('should require key field for heartbeat', async () => {
      const heartbeatData = {
        type: 'heartbeat',
        // missing key
        device_id: 123
      };

      const response = await request(app)
        .post('/detectors')
        .send(heartbeatData);

      expect(response.status).to.equal(400);
      expect(response.body.success).to.be.false;
    });

    it('should handle heartbeat with minimal data', async () => {
      const heartbeatData = {
        type: 'heartbeat',
        key: 'device_123_key'
      };

      const response = await request(app)
        .post('/detectors')
        .send(heartbeatData);

      expect(response.status).to.equal(200);
      expect(response.body.success).to.be.true;
    });

    it('should validate required fields', async () => {
      const heartbeatData = {
        type: 'heartbeat'
        // Missing required key field
      };

      const response = await request(app)
        .post('/detectors')
        .send(heartbeatData);

      expect(response.status).to.equal(400);
      expect(response.body.success).to.be.false;
    });

    it('should store heartbeat when debug enabled', async () => {
      process.env.STORE_HEARTBEATS = 'true';

      const heartbeatData = {
        type: 'heartbeat',
        key: 'device_123_key',
        device_id: 123
      };

      const response = await request(app)
        .post('/detectors')
        .send(heartbeatData);

      expect(response.status).to.equal(200);
      expect(response.body.success).to.be.true;

      delete process.env.STORE_HEARTBEATS;
    });
  });

  describe('Error Handling', () => {
    it('should handle invalid JSON payload', async () => {
      const response = await request(app)
        .post('/detectors')
        .set('Content-Type', 'application/json')
        .send('invalid json{');

      expect(response.status).to.equal(400);
    });

    it('should handle database connection errors', async () => {
      // Mock database error
      const originalFindOne = models.Device.findOne;
      models.Device.findOne = sinon.stub().rejects(new Error('Database connection failed'));

      const detectionData = {
        device_id: 123,
        geo_lat: 59.3293,
        geo_lon: 18.0686,
        device_timestamp: Date.now(),
        drone_type: 2,
        rssi: -65,
        freq: 2400,
        drone_id: 1001
      };

      const response = await request(app)
        .post('/detectors')
        .send(detectionData);

      expect(response.status).to.equal(500);
      expect(response.body.success).to.be.false;

      // Restore original method
      models.Device.findOne = originalFindOne;
    });

    it('should handle missing required fields gracefully', async () => {
      const response = await request(app)
        .post('/detectors')
        .send({});

      expect(response.status).to.equal(400);
      expect(response.body.success).to.be.false;
      expect(response.body.error).to.include('Invalid payload');
    });

    it('should log detection data for debugging', async () => {
      process.env.LOG_ALL_DETECTIONS = 'true';
      const consoleSpy = sinon.spy(console, 'log');

      const device = await createTestDevice({ is_approved: true });
      const detectionData = {
        device_id: device.id,
        geo_lat: 59.3293,
        geo_lon: 18.0686,
        device_timestamp: Date.now(),
        drone_type: 2,
        rssi: -65,
        freq: 2400,
        drone_id: 1001
      };

      await request(app)
        .post('/detectors')
        .send(detectionData);

      expect(consoleSpy.called).to.be.true;
      
      consoleSpy.restore();
      delete process.env.LOG_ALL_DETECTIONS;
    });
  });
});