/**
 * Tests for Web Bluetooth Service
 *
 * Note: These tests mock the Web Bluetooth API since it's not available in Node.js
 */

// Setup TextEncoder/TextDecoder for Node.js environment BEFORE importing the module
// eslint-disable-next-line @typescript-eslint/no-require-imports
const util = require('util');
if (typeof global.TextEncoder === 'undefined') {
  global.TextEncoder = util.TextEncoder;
}
if (typeof global.TextDecoder === 'undefined') {
  global.TextDecoder = util.TextDecoder;
}

import {
  WebBluetoothManager,
  isWebBluetoothSupported,
  isBluetoothAvailable,
  BLE_CONFIG,
  BLE_COMMANDS,
  BLEConnectionState,
  WPDevice,
} from '../webBluetooth';

// Mock BluetoothRemoteGATTCharacteristic
class MockCharacteristic {
  private listeners: Map<string, ((event: Event) => void)[]> = new Map();
  private notifying = false;
  value: DataView | null = null;

  async startNotifications(): Promise<void> {
    this.notifying = true;
  }

  async stopNotifications(): Promise<void> {
    this.notifying = false;
  }

  addEventListener(type: string, listener: (event: Event) => void): void {
    const existing = this.listeners.get(type) || [];
    this.listeners.set(type, [...existing, listener]);
  }

  removeEventListener(type: string, listener: (event: Event) => void): void {
    const existing = this.listeners.get(type) || [];
    this.listeners.set(type, existing.filter((l) => l !== listener));
  }

  async writeValueWithResponse(_value: ArrayBuffer): Promise<void> {
    // Simulate device response after a short delay
    setTimeout(() => {
      const encoder = new TextEncoder();
      const response = encoder.encode('pin|ok');
      this.value = new DataView(response.buffer);

      const listeners = this.listeners.get('characteristicvaluechanged') || [];
      listeners.forEach((listener) => {
        listener({ target: this } as unknown as Event);
      });
    }, 50);
  }

  // Helper for testing - simulate specific response
  simulateResponse(response: string): void {
    const encoder = new TextEncoder();
    const encoded = encoder.encode(response);
    this.value = new DataView(encoded.buffer);

    const listeners = this.listeners.get('characteristicvaluechanged') || [];
    listeners.forEach((listener) => {
      listener({ target: this } as unknown as Event);
    });
  }
}

// Mock BluetoothRemoteGATTService
class MockService {
  constructor(private characteristic: MockCharacteristic) {}

  async getCharacteristic(_uuid: string): Promise<MockCharacteristic> {
    return this.characteristic;
  }
}

// Mock BluetoothRemoteGATTServer
class MockGATTServer {
  connected = true;

  constructor(private service: MockService) {}

  async connect(): Promise<MockGATTServer> {
    this.connected = true;
    return this;
  }

  disconnect(): void {
    this.connected = false;
  }

  async getPrimaryService(_uuid: string): Promise<MockService> {
    return this.service;
  }
}

// Mock BluetoothDevice
class MockBluetoothDevice {
  id: string;
  name: string;
  gatt: MockGATTServer;
  private listeners: Map<string, (() => void)[]> = new Map();

  constructor(id: string, name: string, gattServer: MockGATTServer) {
    this.id = id;
    this.name = name;
    this.gatt = gattServer;
  }

  addEventListener(type: string, listener: () => void): void {
    const existing = this.listeners.get(type) || [];
    this.listeners.set(type, [...existing, listener]);
  }

  removeEventListener(type: string, listener: () => void): void {
    const existing = this.listeners.get(type) || [];
    this.listeners.set(type, existing.filter((l) => l !== listener));
  }

  triggerDisconnection(): void {
    const listeners = this.listeners.get('gattserverdisconnected') || [];
    listeners.forEach((listener) => listener());
  }
}

// Create mock device helper
function createMockDevice(id: string, name: string): { device: MockBluetoothDevice; characteristic: MockCharacteristic } {
  const characteristic = new MockCharacteristic();
  const service = new MockService(characteristic);
  const gattServer = new MockGATTServer(service);
  const device = new MockBluetoothDevice(id, name, gattServer);
  return { device, characteristic };
}

describe('WebBluetoothManager', () => {
  let manager: WebBluetoothManager;

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

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

  describe('isWebBluetoothSupported', () => {
    it('returns false when navigator.bluetooth is not available', () => {
      const originalNavigator = global.navigator;
      // eslint-disable-next-line @typescript-eslint/no-explicit-any
      (global as any).navigator = undefined;

      expect(isWebBluetoothSupported()).toBe(false);

      global.navigator = originalNavigator;
    });
  });

  describe('BLE_CONFIG', () => {
    it('has correct service UUID', () => {
      expect(BLE_CONFIG.SERVICE_UUID).toBe('4fafc201-1fb5-459e-8fcc-c5c9c331914b');
    });

    it('has correct characteristic UUID', () => {
      expect(BLE_CONFIG.CHAR_UUID).toBe('beb5483e-36e1-4688-b7f5-ea07361b26a8');
    });

    it('has correct device name prefix', () => {
      expect(BLE_CONFIG.DEVICE_NAME_PREFIX).toBe('WP_');
    });
  });

  describe('BLE_COMMANDS', () => {
    it('has correct PIN unlock command', () => {
      expect(BLE_COMMANDS.PIN_UNLOCK).toBe('pin|7856');
    });

    it('has correct WiFi list command', () => {
      expect(BLE_COMMANDS.GET_WIFI_LIST).toBe('w');
    });

    it('has correct set WiFi command', () => {
      expect(BLE_COMMANDS.SET_WIFI).toBe('W');
    });

    it('has correct WiFi status command', () => {
      expect(BLE_COMMANDS.GET_WIFI_STATUS).toBe('a');
    });

    it('has correct reboot command', () => {
      expect(BLE_COMMANDS.REBOOT).toBe('s');
    });
  });

  describe('connection state management', () => {
    it('returns DISCONNECTED for unknown device', () => {
      expect(manager.getConnectionState('unknown-device')).toBe(BLEConnectionState.DISCONNECTED);
    });

    it('tracks all connections', () => {
      const connections = manager.getAllConnections();
      expect(connections).toBeInstanceOf(Map);
      expect(connections.size).toBe(0);
    });
  });

  describe('event listeners', () => {
    it('adds event listener', () => {
      const listener = jest.fn();
      manager.addEventListener(listener);

      // Trigger an event by updating state
      const { device } = createMockDevice('test-id', 'WP_497_81a14c');
      const wpDevice: WPDevice = {
        id: 'test-id',
        name: 'WP_497_81a14c',
        mac: '81A14C',
        rssi: -50,
        wellId: 497,
        device: device as unknown as BluetoothDevice,
      };

      // Connect triggers state change
      manager.connectDevice(wpDevice);

      // Give time for async operations
      expect(listener).toHaveBeenCalled();
    });

    it('removes event listener', () => {
      const listener = jest.fn();
      manager.addEventListener(listener);
      manager.removeEventListener(listener);

      // Listener should not be called after removal
      // (internal implementation detail - testing the interface)
    });

    it('does not add duplicate listeners', () => {
      const listener = jest.fn();
      manager.addEventListener(listener);
      manager.addEventListener(listener);
      manager.removeEventListener(listener);

      // After one removal, listener should be gone
    });
  });

  describe('connectDevice', () => {
    it('successfully connects to a device', async () => {
      const { device } = createMockDevice('test-id', 'WP_497_81a14c');
      const wpDevice: WPDevice = {
        id: 'test-id',
        name: 'WP_497_81a14c',
        mac: '81A14C',
        rssi: -50,
        wellId: 497,
        device: device as unknown as BluetoothDevice,
      };

      const result = await manager.connectDevice(wpDevice);

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

    it('prevents concurrent connections to the same device', async () => {
      const { device } = createMockDevice('test-id', 'WP_497_81a14c');
      const wpDevice: WPDevice = {
        id: 'test-id',
        name: 'WP_497_81a14c',
        mac: '81A14C',
        rssi: -50,
        wellId: 497,
        device: device as unknown as BluetoothDevice,
      };

      // Start first connection
      const firstConnection = manager.connectDevice(wpDevice);

      // Try second connection immediately
      const secondConnection = manager.connectDevice(wpDevice);

      const [result1, result2] = await Promise.all([firstConnection, secondConnection]);

      // First should succeed, second should fail (or both succeed if first finished fast)
      expect(result1).toBe(true);
      // Second might succeed if first finished before it started
    });

    it('returns true if already connected', async () => {
      const { device } = createMockDevice('test-id', 'WP_497_81a14c');
      const wpDevice: WPDevice = {
        id: 'test-id',
        name: 'WP_497_81a14c',
        mac: '81A14C',
        rssi: -50,
        wellId: 497,
        device: device as unknown as BluetoothDevice,
      };

      // First connection
      await manager.connectDevice(wpDevice);

      // Second connection should return true immediately
      const result = await manager.connectDevice(wpDevice);
      expect(result).toBe(true);
    });
  });

  describe('disconnectDevice', () => {
    it('disconnects a connected device', async () => {
      const { device } = createMockDevice('test-id', 'WP_497_81a14c');
      const wpDevice: WPDevice = {
        id: 'test-id',
        name: 'WP_497_81a14c',
        mac: '81A14C',
        rssi: -50,
        wellId: 497,
        device: device as unknown as BluetoothDevice,
      };

      await manager.connectDevice(wpDevice);
      expect(manager.isDeviceConnected('test-id')).toBe(true);

      await manager.disconnectDevice('test-id');
      expect(manager.isDeviceConnected('test-id')).toBe(false);
      expect(manager.getConnectionState('test-id')).toBe(BLEConnectionState.DISCONNECTED);
    });

    it('handles disconnect of non-existent device', async () => {
      await expect(manager.disconnectDevice('non-existent')).resolves.not.toThrow();
    });
  });

  describe('cleanup', () => {
    it('cleans up all connections', async () => {
      const { device: device1 } = createMockDevice('test-id-1', 'WP_497_81a14c');
      const { device: device2 } = createMockDevice('test-id-2', 'WP_523_81aad4');

      const wpDevice1: WPDevice = {
        id: 'test-id-1',
        name: 'WP_497_81a14c',
        mac: '81A14C',
        rssi: -50,
        wellId: 497,
        device: device1 as unknown as BluetoothDevice,
      };

      const wpDevice2: WPDevice = {
        id: 'test-id-2',
        name: 'WP_523_81aad4',
        mac: '81AAD4',
        rssi: -67,
        wellId: 523,
        device: device2 as unknown as BluetoothDevice,
      };

      await manager.connectDevice(wpDevice1);
      await manager.connectDevice(wpDevice2);

      expect(manager.isDeviceConnected('test-id-1')).toBe(true);
      expect(manager.isDeviceConnected('test-id-2')).toBe(true);

      await manager.cleanup();

      expect(manager.isDeviceConnected('test-id-1')).toBe(false);
      expect(manager.isDeviceConnected('test-id-2')).toBe(false);
      expect(manager.getAllConnections().size).toBe(0);
    });
  });

  describe('WiFi validation', () => {
    it('rejects SSID with pipe character', async () => {
      const { device } = createMockDevice('test-id', 'WP_497_81a14c');
      const wpDevice: WPDevice = {
        id: 'test-id',
        name: 'WP_497_81a14c',
        mac: '81A14C',
        rssi: -50,
        wellId: 497,
        device: device as unknown as BluetoothDevice,
      };

      await manager.connectDevice(wpDevice);

      await expect(manager.setWiFi('test-id', 'Test|Network', 'password123')).rejects.toThrow(
        'Network name contains invalid characters'
      );
    });

    it('rejects SSID with comma character', async () => {
      const { device } = createMockDevice('test-id', 'WP_497_81a14c');
      const wpDevice: WPDevice = {
        id: 'test-id',
        name: 'WP_497_81a14c',
        mac: '81A14C',
        rssi: -50,
        wellId: 497,
        device: device as unknown as BluetoothDevice,
      };

      await manager.connectDevice(wpDevice);

      await expect(manager.setWiFi('test-id', 'Test,Network', 'password123')).rejects.toThrow(
        'Network name contains invalid characters'
      );
    });

    it('rejects password with pipe character', async () => {
      const { device } = createMockDevice('test-id', 'WP_497_81a14c');
      const wpDevice: WPDevice = {
        id: 'test-id',
        name: 'WP_497_81a14c',
        mac: '81A14C',
        rssi: -50,
        wellId: 497,
        device: device as unknown as BluetoothDevice,
      };

      await manager.connectDevice(wpDevice);

      await expect(manager.setWiFi('test-id', 'TestNetwork', 'pass|word123')).rejects.toThrow(
        'Password contains an invalid character'
      );
    });
  });

  describe('device parsing', () => {
    it('correctly parses device name format', () => {
      // Test the parsing logic implicitly through device creation
      const deviceName = 'WP_497_81a14c';

      // Parse well_id from name (WP_497_81a14c -> 497)
      const wellIdMatch = deviceName.match(/WP_(\d+)_/);
      const wellId = wellIdMatch ? parseInt(wellIdMatch[1], 10) : undefined;

      // Extract MAC from device name (last part after underscore)
      const macMatch = deviceName.match(/_([a-fA-F0-9]{6})$/);
      const mac = macMatch ? macMatch[1].toUpperCase() : '';

      expect(wellId).toBe(497);
      expect(mac).toBe('81A14C');
    });

    it('handles device name without well_id', () => {
      const deviceName = 'WP_81a14c';

      const wellIdMatch = deviceName.match(/WP_(\d+)_/);
      const wellId = wellIdMatch ? parseInt(wellIdMatch[1], 10) : undefined;

      expect(wellId).toBeUndefined();
    });
  });
});

describe('isBluetoothAvailable', () => {
  it('returns false when navigator.bluetooth is not available', async () => {
    const originalNavigator = global.navigator;
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    (global as any).navigator = undefined;

    const result = await isBluetoothAvailable();
    expect(result).toBe(false);

    global.navigator = originalNavigator;
  });
});