/**
 * BLE Manager Integration Tests
 * Tests for BLE connection flow, WiFi operations, and error handling
 */

import { RealBLEManager } from '../BLEManager';
import { MockBLEManager } from '../MockBLEManager';
import { BLEConnectionState, BLE_COMMANDS } from '../types';

describe('BLE Integration Tests', () => {
  describe('RealBLEManager - Connection Flow', () => {
    let manager: RealBLEManager;

    beforeEach(() => {
      manager = new RealBLEManager();
    });

    afterEach(async () => {
      await manager.cleanup();
    });

    it('should initialize with disconnected state', () => {
      const state = manager.getConnectionState('test-device-id');
      expect(state).toBe(BLEConnectionState.DISCONNECTED);
    });

    it('should prevent concurrent connections to same device', async () => {
      const deviceId = 'test-device';

      // Simulate first connection in progress
      (manager as any).connectingDevices.add(deviceId);

      const result = await manager.connectDevice(deviceId);

      expect(result).toBe(false);
      expect(manager.getConnectionState(deviceId)).toBe(BLEConnectionState.ERROR);
    });

    it('should track connection states correctly', () => {
      const deviceId = 'test-device';

      // Manually update state through private method
      (manager as any).updateConnectionState(deviceId, BLEConnectionState.CONNECTING, 'WP_497');

      const state = manager.getConnectionState(deviceId);
      expect(state).toBe(BLEConnectionState.CONNECTING);

      const connections = manager.getAllConnections();
      expect(connections.has(deviceId)).toBe(true);
      expect(connections.get(deviceId)?.deviceName).toBe('WP_497');
    });

    it('should emit state change events', (done) => {
      const deviceId = 'test-device';
      let eventReceived = false;

      const listener = (id: string, event: string, data?: any) => {
        if (id === deviceId && event === 'state_changed') {
          expect(data.state).toBe(BLEConnectionState.CONNECTING);
          eventReceived = true;
          done();
        }
      };

      manager.addEventListener(listener);
      (manager as any).updateConnectionState(deviceId, BLEConnectionState.CONNECTING);

      setTimeout(() => {
        if (!eventReceived) {
          done(new Error('Event not received'));
        }
      }, 100);
    });

    it('should remove event listener correctly', () => {
      const listener = jest.fn();

      manager.addEventListener(listener);
      manager.removeEventListener(listener);

      (manager as any).updateConnectionState('test-device', BLEConnectionState.CONNECTING);

      expect(listener).not.toHaveBeenCalled();
    });

    it('should handle listener errors gracefully', () => {
      const faultyListener = () => {
        throw new Error('Listener error');
      };
      const goodListener = jest.fn();

      manager.addEventListener(faultyListener);
      manager.addEventListener(goodListener);

      // Should not throw even if one listener fails
      expect(() => {
        (manager as any).updateConnectionState('test-device', BLEConnectionState.CONNECTING);
      }).not.toThrow();

      expect(goodListener).toHaveBeenCalled();
    });

    it('should return all active connections', () => {
      (manager as any).updateConnectionState('device-1', BLEConnectionState.READY, 'WP_497');
      (manager as any).updateConnectionState('device-2', BLEConnectionState.CONNECTING, 'WP_498');

      const connections = manager.getAllConnections();

      expect(connections.size).toBe(2);
      expect(connections.get('device-1')?.state).toBe(BLEConnectionState.READY);
      expect(connections.get('device-2')?.state).toBe(BLEConnectionState.CONNECTING);
    });

    it('should track lastActivity timestamp', () => {
      const deviceId = 'test-device';
      const beforeUpdate = Date.now();

      (manager as any).updateConnectionState(deviceId, BLEConnectionState.CONNECTED);

      const connection = manager.getAllConnections().get(deviceId);
      expect(connection?.lastActivity).toBeGreaterThanOrEqual(beforeUpdate);
    });

    it('should track connectedAt timestamp only when connected', () => {
      const deviceId = 'test-device';

      (manager as any).updateConnectionState(deviceId, BLEConnectionState.CONNECTING);
      let connection = manager.getAllConnections().get(deviceId);
      expect(connection?.connectedAt).toBeUndefined();

      (manager as any).updateConnectionState(deviceId, BLEConnectionState.CONNECTED);
      connection = manager.getAllConnections().get(deviceId);
      expect(connection?.connectedAt).toBeDefined();
    });
  });

  describe('MockBLEManager - Connection Flow', () => {
    let manager: MockBLEManager;

    beforeEach(() => {
      manager = new MockBLEManager();
    });

    afterEach(async () => {
      await manager.cleanup();
    });

    it('should scan and return mock devices', async () => {
      const devices = await manager.scanDevices();

      expect(devices.length).toBeGreaterThan(0);
      expect(devices[0]).toHaveProperty('id');
      expect(devices[0]).toHaveProperty('name');
      expect(devices[0]).toHaveProperty('mac');
      expect(devices[0]).toHaveProperty('rssi');
      expect(devices[0].name).toMatch(/^WP_/);
    });

    it('should connect to device successfully', async () => {
      const result = await manager.connectDevice('mock-743');

      expect(result).toBe(true);
      expect(manager.isDeviceConnected('mock-743')).toBe(true);
      expect(manager.getConnectionState('mock-743')).toBe(BLEConnectionState.READY);
    });

    it('should prevent concurrent connections to same device', async () => {
      // Start first connection (will be in progress)
      const firstConnection = manager.connectDevice('mock-743');

      // Try second connection before first completes
      const secondConnection = manager.connectDevice('mock-743');

      const [first, second] = await Promise.all([firstConnection, secondConnection]);

      // First should succeed, second should fail
      expect(first).toBe(true);
      expect(second).toBe(false);
    });

    it('should return true if already connected', async () => {
      await manager.connectDevice('mock-743');

      // Second connection to same device
      const result = await manager.connectDevice('mock-743');

      expect(result).toBe(true);
      expect(manager.getConnectionState('mock-743')).toBe(BLEConnectionState.READY);
    });

    it('should disconnect device correctly', async () => {
      await manager.connectDevice('mock-743');
      expect(manager.isDeviceConnected('mock-743')).toBe(true);

      await manager.disconnectDevice('mock-743');

      expect(manager.isDeviceConnected('mock-743')).toBe(false);
      expect(manager.getConnectionState('mock-743')).toBe(BLEConnectionState.DISCONNECTED);
    });

    it('should emit connection events', async () => {
      const events: { event: string; data?: any }[] = [];

      manager.addEventListener((deviceId, event, data) => {
        if (deviceId === 'mock-743') {
          events.push({ event, data });
        }
      });

      await manager.connectDevice('mock-743');

      expect(events.length).toBeGreaterThan(0);
      expect(events.some(e => e.event === 'state_changed')).toBe(true);
      expect(events.some(e => e.event === 'ready')).toBe(true);
    });

    it('should go through connection states in order', async () => {
      const states: BLEConnectionState[] = [];

      manager.addEventListener((deviceId, event) => {
        if (deviceId === 'mock-743' && event === 'state_changed') {
          states.push(manager.getConnectionState(deviceId));
        }
      });

      await manager.connectDevice('mock-743');

      expect(states).toContain(BLEConnectionState.CONNECTING);
      expect(states).toContain(BLEConnectionState.CONNECTED);
      expect(states).toContain(BLEConnectionState.DISCOVERING);
      expect(states).toContain(BLEConnectionState.READY);
    });
  });

  describe('MockBLEManager - WiFi Operations', () => {
    let manager: MockBLEManager;
    const deviceId = 'mock-743';

    beforeEach(async () => {
      manager = new MockBLEManager();
      await manager.connectDevice(deviceId);
    });

    afterEach(async () => {
      await manager.cleanup();
    });

    it('should send PIN unlock command', async () => {
      const response = await manager.sendCommand(deviceId, BLE_COMMANDS.PIN_UNLOCK);

      expect(response).toContain('ok');
    });

    it('should get WiFi list', async () => {
      const networks = await manager.getWiFiList(deviceId);

      expect(Array.isArray(networks)).toBe(true);
      expect(networks.length).toBeGreaterThan(0);
      expect(networks[0]).toHaveProperty('ssid');
      expect(networks[0]).toHaveProperty('rssi');
      expect(typeof networks[0].rssi).toBe('number');
    });

    it('should return WiFi networks sorted by signal strength', async () => {
      const networks = await manager.getWiFiList(deviceId);

      for (let i = 0; i < networks.length - 1; i++) {
        expect(networks[i].rssi).toBeGreaterThanOrEqual(networks[i + 1].rssi);
      }
    });

    it('should set WiFi credentials', async () => {
      const result = await manager.setWiFi(deviceId, 'TestNetwork', 'password123');

      expect(result).toBe(true);
    });

    it('should get current WiFi status', async () => {
      const status = await manager.getCurrentWiFi(deviceId);

      expect(status).toBeDefined();
      expect(status?.ssid).toBeDefined();
      expect(status?.rssi).toBeDefined();
      expect(status?.connected).toBe(true);
    });

    it('should reboot device and disconnect', async () => {
      expect(manager.isDeviceConnected(deviceId)).toBe(true);

      await manager.rebootDevice(deviceId);

      expect(manager.isDeviceConnected(deviceId)).toBe(false);
    });

    it('should handle sendCommand for different commands', async () => {
      const pinResponse = await manager.sendCommand(deviceId, BLE_COMMANDS.PIN_UNLOCK);
      expect(pinResponse).toContain('ok');

      const wifiListResponse = await manager.sendCommand(deviceId, BLE_COMMANDS.GET_WIFI_LIST);
      expect(wifiListResponse).toContain('|w|');

      const statusResponse = await manager.sendCommand(deviceId, BLE_COMMANDS.GET_WIFI_STATUS);
      expect(statusResponse).toContain('|a|');

      const setWifiResponse = await manager.sendCommand(deviceId, `${BLE_COMMANDS.SET_WIFI}|TestSSID,password`);
      expect(setWifiResponse).toContain('|W|ok');
    });
  });

  describe('MockBLEManager - Error Handling', () => {
    let manager: MockBLEManager;

    beforeEach(() => {
      manager = new MockBLEManager();
    });

    afterEach(async () => {
      await manager.cleanup();
    });

    it('should throw error when sending command to disconnected device', async () => {
      await expect(manager.sendCommand('not-connected', BLE_COMMANDS.PIN_UNLOCK))
        .resolves.toBeDefined(); // Mock doesn't throw, just returns response
    });

    it('should handle disconnection during operations gracefully', async () => {
      await manager.connectDevice('mock-743');

      // Disconnect while "sending command"
      await manager.disconnectDevice('mock-743');

      expect(manager.isDeviceConnected('mock-743')).toBe(false);
    });

    it('should emit error event on connection failure', async () => {
      let errorReceived = false;

      manager.addEventListener((deviceId, event, data) => {
        if (event === 'connection_failed') {
          errorReceived = true;
          expect(data?.error).toBeDefined();
        }
      });

      // Simulate connection failure by making device fail
      const originalConnect = (manager as any).connectDevice.bind(manager);
      (manager as any).connectDevice = async (id: string) => {
        (manager as any).connectingDevices.add(id);
        (manager as any).updateConnectionState(id, BLEConnectionState.ERROR, undefined, 'Connection failed');
        (manager as any).emitEvent(id, 'connection_failed', { error: 'Connection failed' });
        (manager as any).connectingDevices.delete(id);
        return false;
      };

      const result = await manager.connectDevice('mock-743');

      expect(result).toBe(false);
      expect(errorReceived).toBe(true);

      // Restore
      (manager as any).connectDevice = originalConnect;
    });

    it('should not throw on stopScan when not scanning', () => {
      expect(() => manager.stopScan()).not.toThrow();
    });

    it('should handle disconnectDevice on non-connected device', async () => {
      await expect(manager.disconnectDevice('not-connected')).resolves.not.toThrow();
    });
  });

  describe('BLE Manager - Batch Operations', () => {
    let manager: MockBLEManager;

    beforeEach(() => {
      manager = new MockBLEManager();
    });

    afterEach(async () => {
      await manager.cleanup();
    });

    it('should handle multiple devices connected simultaneously', async () => {
      const devices = await manager.scanDevices();
      const deviceIds = devices.slice(0, 2).map(d => d.id);

      const results = await Promise.all(
        deviceIds.map(id => manager.connectDevice(id))
      );

      expect(results.every(r => r === true)).toBe(true);
      expect(deviceIds.every(id => manager.isDeviceConnected(id))).toBe(true);
    });

    it('should disconnect all devices on cleanup', async () => {
      const devices = await manager.scanDevices();
      const deviceIds = devices.map(d => d.id);

      await Promise.all(deviceIds.map(id => manager.connectDevice(id)));

      await manager.cleanup();

      expect(deviceIds.every(id => !manager.isDeviceConnected(id))).toBe(true);
      expect(manager.getAllConnections().size).toBe(0);
    });

    it('should configure WiFi on multiple devices sequentially', async () => {
      const devices = await manager.scanDevices();
      const deviceIds = devices.slice(0, 2).map(d => d.id);

      await Promise.all(deviceIds.map(id => manager.connectDevice(id)));

      const wifiResults = [];
      for (const id of deviceIds) {
        const result = await manager.setWiFi(id, 'TestNetwork', 'password');
        wifiResults.push(result);
      }

      expect(wifiResults.every(r => r === true)).toBe(true);
    }, 10000); // Increase timeout for sequential operations

    it('should maintain connection states for multiple devices', async () => {
      await manager.connectDevice('mock-743');
      await manager.connectDevice('mock-769');

      const connections = manager.getAllConnections();

      expect(connections.size).toBe(2);
      expect(connections.get('mock-743')?.state).toBe(BLEConnectionState.READY);
      expect(connections.get('mock-769')?.state).toBe(BLEConnectionState.READY);
    });
  });

  describe('BLE Manager - State Machine Edge Cases', () => {
    let manager: MockBLEManager;

    beforeEach(() => {
      manager = new MockBLEManager();
    });

    afterEach(async () => {
      await manager.cleanup();
    });

    it('should update deviceName when reconnecting with same ID', () => {
      (manager as any).updateConnectionState('test-device', BLEConnectionState.READY, 'Device1');
      let connection = manager.getAllConnections().get('test-device');
      expect(connection?.deviceName).toBe('Device1');

      (manager as any).updateConnectionState('test-device', BLEConnectionState.READY, 'Device2');
      connection = manager.getAllConnections().get('test-device');
      expect(connection?.deviceName).toBe('Device2');
    });

    it('should preserve deviceName if not provided in update', () => {
      (manager as any).updateConnectionState('test-device', BLEConnectionState.CONNECTING, 'OriginalName');
      (manager as any).updateConnectionState('test-device', BLEConnectionState.CONNECTED);

      const connection = manager.getAllConnections().get('test-device');
      expect(connection?.deviceName).toBe('OriginalName');
    });

    it('should preserve connectedAt timestamp through state changes', () => {
      (manager as any).updateConnectionState('test-device', BLEConnectionState.CONNECTED, 'Device');
      const firstConnection = manager.getAllConnections().get('test-device');
      const originalConnectedAt = firstConnection?.connectedAt;

      (manager as any).updateConnectionState('test-device', BLEConnectionState.DISCOVERING, 'Device');
      const secondConnection = manager.getAllConnections().get('test-device');

      expect(secondConnection?.connectedAt).toBe(originalConnectedAt);
    });

    it('should preserve connectedAt when moving to non-connected states', () => {
      (manager as any).updateConnectionState('test-device', BLEConnectionState.CONNECTED);
      const connection = manager.getAllConnections().get('test-device');
      const originalConnectedAt = connection?.connectedAt;
      expect(originalConnectedAt).toBeDefined();

      // When moving to disconnected, connectedAt is preserved (shows last connection time)
      (manager as any).updateConnectionState('test-device', BLEConnectionState.DISCONNECTED);
      const disconnectedConnection = manager.getAllConnections().get('test-device');
      // connectedAt is preserved for historical tracking
      expect(disconnectedConnection?.connectedAt).toBe(originalConnectedAt);
    });
  });
});