/**
 * Universal Device class
 * A device is a network endpoint that can have multiple features (capabilities)
 */

import * as plugins from '../plugins.js';
import type {
  TFeatureType,
  IFeatureInfo,
  IDiscoveredFeature,
} from '../interfaces/feature.interfaces.js';
import type { TDeviceStatus, IRetryOptions } from '../interfaces/index.js';
import { Feature, type TDeviceReference } from '../features/feature.abstract.js';

// ============================================================================
// Device Info Interface
// ============================================================================

/**
 * Serializable device information
 */
export interface IUniversalDeviceInfo {
  id: string;
  name: string;
  address: string;
  port: number;
  status: TDeviceStatus;
  manufacturer?: string;
  model?: string;
  serialNumber?: string;
  firmwareVersion?: string;
  features: IFeatureInfo[];
  featureTypes: TFeatureType[];
}

/**
 * Options for creating a device
 */
export interface IDeviceCreateOptions {
  name?: string;
  manufacturer?: string;
  model?: string;
  serialNumber?: string;
  firmwareVersion?: string;
  retryOptions?: IRetryOptions;
}

// ============================================================================
// Universal Device Class
// ============================================================================

/**
 * Universal Device - represents any network device with composable features
 *
 * Instead of having separate Scanner, Printer, Speaker classes, a Device can have
 * any combination of features (scan, print, playback, volume, etc.)
 *
 * @example
 * ```typescript
 * // A multifunction printer/scanner
 * const mfp = new UniversalDevice('192.168.1.100', 80);
 * mfp.addFeature(new ScanFeature(mfp, 80));
 * mfp.addFeature(new PrintFeature(mfp, 631));
 *
 * // Check capabilities
 * if (mfp.hasFeature('scan') && mfp.hasFeature('print')) {
 *   const scanFeature = mfp.getFeature<ScanFeature>('scan');
 *   await scanFeature.scan({ format: 'pdf' });
 * }
 * ```
 */
export class UniversalDevice extends plugins.events.EventEmitter {
  // ============================================================================
  // Properties
  // ============================================================================

  /**
   * Unique device identifier
   * Format: {address}:{port} or custom ID from discovery
   */
  public readonly id: string;

  /**
   * Human-readable device name
   */
  public name: string;

  /**
   * Device network address (IP or hostname)
   */
  public readonly address: string;

  /**
   * Primary device port
   */
  public readonly port: number;

  /**
   * Device manufacturer
   */
  public manufacturer?: string;

  /**
   * Device model
   */
  public model?: string;

  /**
   * Device serial number
   */
  public serialNumber?: string;

  /**
   * Device firmware version
   */
  public firmwareVersion?: string;

  /**
   * Current device status
   */
  protected _status: TDeviceStatus = 'unknown';

  /**
   * Map of features by type
   */
  protected _features: Map<TFeatureType, Feature> = new Map();

  /**
   * Retry options for features
   */
  protected _retryOptions: IRetryOptions;

  // ============================================================================
  // Constructor
  // ============================================================================

  constructor(
    address: string,
    port: number,
    options?: IDeviceCreateOptions
  ) {
    super();
    this.address = address;
    this.port = port;
    this.id = `${address}:${port}`;
    this.name = options?.name ?? `Device at ${address}`;
    this.manufacturer = options?.manufacturer;
    this.model = options?.model;
    this.serialNumber = options?.serialNumber;
    this.firmwareVersion = options?.firmwareVersion;
    this._retryOptions = options?.retryOptions ?? {};
  }

  // ============================================================================
  // Status Management
  // ============================================================================

  /**
   * Get current device status
   */
  public get status(): TDeviceStatus {
    return this._status;
  }

  /**
   * Set device status
   */
  public set status(value: TDeviceStatus) {
    if (this._status !== value) {
      const oldStatus = this._status;
      this._status = value;
      this.emit('status:changed', { oldStatus, newStatus: value });
    }
  }

  /**
   * Check if device is online
   */
  public get isOnline(): boolean {
    return this._status === 'online';
  }

  // ============================================================================
  // Feature Management
  // ============================================================================

  /**
   * Add a feature to the device
   */
  public addFeature(feature: Feature): void {
    if (this._features.has(feature.type)) {
      throw new Error(`Feature '${feature.type}' already exists on device ${this.id}`);
    }

    this._features.set(feature.type, feature);

    // Forward feature events
    feature.on('connected', () => this.emit('feature:connected', feature.type));
    feature.on('disconnected', () => this.emit('feature:disconnected', feature.type));
    feature.on('error', (error) => this.emit('feature:error', { type: feature.type, error }));
    feature.on('state:changed', (states) => this.emit('feature:state:changed', { type: feature.type, ...states }));

    this.emit('feature:added', feature);
  }

  /**
   * Remove a feature from the device
   */
  public async removeFeature(type: TFeatureType): Promise<boolean> {
    const feature = this._features.get(type);
    if (!feature) {
      return false;
    }

    // Disconnect the feature first
    try {
      await feature.disconnect();
    } catch {
      // Ignore disconnect errors
    }

    this._features.delete(type);
    this.emit('feature:removed', type);
    return true;
  }

  /**
   * Check if device has a specific feature
   */
  public hasFeature(type: TFeatureType): boolean {
    return this._features.has(type);
  }

  /**
   * Check if device has all specified features
   */
  public hasFeatures(types: TFeatureType[]): boolean {
    return types.every((type) => this._features.has(type));
  }

  /**
   * Check if device has any of the specified features
   */
  public hasAnyFeature(types: TFeatureType[]): boolean {
    return types.some((type) => this._features.has(type));
  }

  /**
   * Get a feature by type (returns undefined if not available)
   */
  public getFeature<T extends Feature>(type: TFeatureType): T | undefined {
    return this._features.get(type) as T | undefined;
  }

  /**
   * Select a feature by type (throws if not available).
   * Use this when you expect the device to have this feature and want fail-fast behavior.
   *
   * @param type The feature type to select
   * @returns The feature instance
   * @throws Error if the device does not have this feature
   *
   * @example
   * ```typescript
   * const scanFeature = device.selectFeature<ScanFeature>('scan');
   * await scanFeature.connect();
   * const result = await scanFeature.scan({ source: 'flatbed' });
   * ```
   */
  public selectFeature<T extends Feature>(type: TFeatureType): T {
    const feature = this._features.get(type) as T | undefined;
    if (!feature) {
      throw new Error(`Device '${this.name}' does not have feature '${type}'`);
    }
    return feature;
  }

  /**
   * Get all features
   */
  public getFeatures(): Feature[] {
    return Array.from(this._features.values());
  }

  /**
   * Get all feature types
   */
  public getFeatureTypes(): TFeatureType[] {
    return Array.from(this._features.keys());
  }

  /**
   * Get feature count
   */
  public get featureCount(): number {
    return this._features.size;
  }

  // ============================================================================
  // Connection Management
  // ============================================================================

  /**
   * Connect all features
   */
  public async connect(): Promise<void> {
    const features = this.getFeatures();
    const results = await Promise.allSettled(
      features.map((f) => f.connect())
    );

    // Check if any connected successfully
    const anyConnected = results.some((r) => r.status === 'fulfilled');

    if (anyConnected) {
      this.status = 'online';
    } else if (results.length > 0) {
      // All failed
      this.status = 'error';
      const errors = results
        .filter((r): r is PromiseRejectedResult => r.status === 'rejected')
        .map((r) => r.reason);
      throw new AggregateError(errors, 'Failed to connect any features');
    }
  }

  /**
   * Connect a specific feature
   */
  public async connectFeature(type: TFeatureType): Promise<void> {
    const feature = this._features.get(type);
    if (!feature) {
      throw new Error(`Feature '${type}' not found on device ${this.id}`);
    }
    await feature.connect();

    // Update device status if this is the first connected feature
    if (this._status !== 'online') {
      this.status = 'online';
    }
  }

  /**
   * Disconnect all features
   */
  public async disconnect(): Promise<void> {
    const features = this.getFeatures();
    await Promise.allSettled(
      features.map((f) => f.disconnect())
    );
    this.status = 'offline';
  }

  /**
   * Disconnect a specific feature
   */
  public async disconnectFeature(type: TFeatureType): Promise<void> {
    const feature = this._features.get(type);
    if (feature) {
      await feature.disconnect();
    }

    // Update device status if all features are disconnected
    const anyConnected = this.getFeatures().some((f) => f.isConnected);
    if (!anyConnected) {
      this.status = 'offline';
    }
  }

  // ============================================================================
  // Serialization
  // ============================================================================

  /**
   * Get device reference for features
   */
  public getDeviceReference(): TDeviceReference {
    return {
      id: this.id,
      name: this.name,
      address: this.address,
      port: this.port,
    };
  }

  /**
   * Get serializable device info
   */
  public getDeviceInfo(): IUniversalDeviceInfo {
    return {
      id: this.id,
      name: this.name,
      address: this.address,
      port: this.port,
      status: this._status,
      manufacturer: this.manufacturer,
      model: this.model,
      serialNumber: this.serialNumber,
      firmwareVersion: this.firmwareVersion,
      features: this.getFeatures().map((f) => f.getFeatureInfo()),
      featureTypes: this.getFeatureTypes(),
    };
  }

  /**
   * Get retry options for features
   */
  public get retryOptions(): IRetryOptions {
    return this._retryOptions;
  }

  // ============================================================================
  // Static Factory Methods
  // ============================================================================

  /**
   * Create a device from discovered features
   */
  public static fromDiscovery(
    id: string,
    name: string,
    address: string,
    port: number,
    discoveredFeatures: IDiscoveredFeature[],
    options?: IDeviceCreateOptions
  ): UniversalDevice {
    const device = new UniversalDevice(address, port, {
      ...options,
      name,
    });

    // Override the generated ID with the discovery ID
    (device as { id: string }).id = id;

    // Features will be added by the DeviceManager after creation
    // This is because feature instances need protocol-specific initialization

    return device;
  }
}

// ============================================================================
// Type Guards
// ============================================================================

/**
 * Check if a device has a specific feature (type guard)
 */
export function deviceHasFeature<T extends Feature>(
  device: UniversalDevice,
  type: TFeatureType
): device is UniversalDevice & { getFeature(type: TFeatureType): T } {
  return device.hasFeature(type);
}