import * as plugins from './plugins.js';
import { MdnsDiscovery, SERVICE_TYPES } from './discovery/discovery.classes.mdns.js';
import { NetworkScanner } from './discovery/discovery.classes.networkscanner.js';
import { Scanner } from './scanner/scanner.classes.scanner.js';
import { Printer } from './printer/printer.classes.printer.js';
import type {
  IDeviceManagerOptions,
  IDiscoveredDevice,
  IRetryOptions,
  TDeviceManagerEvents,
  INetworkScanOptions,
  INetworkScanResult,
} from './interfaces/index.js';

/**
 * Default device manager options
 */
const DEFAULT_OPTIONS: Required<IDeviceManagerOptions> = {
  autoDiscovery: true,
  discoveryTimeout: 10000,
  enableRetry: true,
  maxRetries: 5,
  retryBaseDelay: 1000,
};

/**
 * Main Device Manager class for discovering and managing network devices
 */
export class DeviceManager extends plugins.events.EventEmitter {
  private discovery: MdnsDiscovery;
  private _networkScanner: NetworkScanner | null = null;
  private scanners: Map<string, Scanner> = new Map();
  private printers: Map<string, Printer> = new Map();
  private options: Required<IDeviceManagerOptions>;
  private retryOptions: IRetryOptions;

  constructor(options?: IDeviceManagerOptions) {
    super();
    this.options = { ...DEFAULT_OPTIONS, ...options };

    this.retryOptions = {
      maxRetries: this.options.maxRetries,
      baseDelay: this.options.retryBaseDelay,
      maxDelay: 16000,
      multiplier: 2,
      jitter: true,
    };

    this.discovery = new MdnsDiscovery({
      timeout: this.options.discoveryTimeout,
    });

    this.setupDiscoveryEvents();
  }

  /**
   * Setup event forwarding from discovery service
   */
  private setupDiscoveryEvents(): void {
    this.discovery.on('device:found', (device: IDiscoveredDevice) => {
      this.handleDeviceFound(device);
    });

    this.discovery.on('device:lost', (device: IDiscoveredDevice) => {
      this.handleDeviceLost(device);
    });

    this.discovery.on('scanner:found', (device: IDiscoveredDevice) => {
      // Scanner found event is emitted after device:found handling
    });

    this.discovery.on('printer:found', (device: IDiscoveredDevice) => {
      // Printer found event is emitted after device:found handling
    });

    this.discovery.on('started', () => {
      this.emit('discovery:started');
    });

    this.discovery.on('stopped', () => {
      this.emit('discovery:stopped');
    });
  }

  /**
   * Handle newly discovered device
   */
  private handleDeviceFound(device: IDiscoveredDevice): void {
    if (device.type === 'scanner') {
      // Create Scanner instance
      const scanner = Scanner.fromDiscovery(
        {
          id: device.id,
          name: device.name,
          address: device.address,
          port: device.port,
          protocol: device.protocol as 'sane' | 'escl',
          txtRecords: device.txtRecords,
        },
        this.options.enableRetry ? this.retryOptions : undefined
      );

      this.scanners.set(device.id, scanner);
      this.emit('scanner:found', scanner.getScannerInfo());
    } else if (device.type === 'printer') {
      // Create Printer instance
      const printer = Printer.fromDiscovery(
        {
          id: device.id,
          name: device.name,
          address: device.address,
          port: device.port,
          txtRecords: device.txtRecords,
        },
        this.options.enableRetry ? this.retryOptions : undefined
      );

      this.printers.set(device.id, printer);
      this.emit('printer:found', printer.getPrinterInfo());
    }
  }

  /**
   * Handle lost device
   */
  private handleDeviceLost(device: IDiscoveredDevice): void {
    if (device.type === 'scanner') {
      const scanner = this.scanners.get(device.id);
      if (scanner) {
        // Disconnect if connected
        if (scanner.isConnected) {
          scanner.disconnect().catch(() => {});
        }
        this.scanners.delete(device.id);
        this.emit('scanner:lost', device.id);
      }
    } else if (device.type === 'printer') {
      const printer = this.printers.get(device.id);
      if (printer) {
        // Disconnect if connected
        if (printer.isConnected) {
          printer.disconnect().catch(() => {});
        }
        this.printers.delete(device.id);
        this.emit('printer:lost', device.id);
      }
    }
  }

  /**
   * Start device discovery
   */
  public async startDiscovery(): Promise<void> {
    await this.discovery.start();
  }

  /**
   * Stop device discovery
   */
  public async stopDiscovery(): Promise<void> {
    await this.discovery.stop();
  }

  /**
   * Check if discovery is running
   */
  public get isDiscovering(): boolean {
    return this.discovery.running;
  }

  /**
   * Get all discovered scanners
   */
  public getScanners(): Scanner[] {
    return Array.from(this.scanners.values());
  }

  /**
   * Get all discovered printers
   */
  public getPrinters(): Printer[] {
    return Array.from(this.printers.values());
  }

  /**
   * Get scanner by ID
   */
  public getScanner(id: string): Scanner | undefined {
    return this.scanners.get(id);
  }

  /**
   * Get printer by ID
   */
  public getPrinter(id: string): Printer | undefined {
    return this.printers.get(id);
  }

  /**
   * Get all devices (scanners and printers)
   */
  public getDevices(): (Scanner | Printer)[] {
    return [...this.getScanners(), ...this.getPrinters()];
  }

  /**
   * Get device by ID (scanner or printer)
   */
  public getDevice(id: string): Scanner | Printer | undefined {
    return this.scanners.get(id) ?? this.printers.get(id);
  }

  /**
   * Add a scanner manually (without discovery)
   */
  public async addScanner(
    address: string,
    port: number,
    protocol: 'escl' | 'sane' = 'escl',
    name?: string
  ): Promise<Scanner> {
    const id = `manual:${protocol}:${address}:${port}`;

    // Check if already exists
    if (this.scanners.has(id)) {
      return this.scanners.get(id)!;
    }

    const scanner = Scanner.fromDiscovery(
      {
        id,
        name: name ?? `Scanner at ${address}`,
        address,
        port,
        protocol,
        txtRecords: {},
      },
      this.options.enableRetry ? this.retryOptions : undefined
    );

    // Try to connect to validate
    await scanner.connect();

    this.scanners.set(id, scanner);
    this.emit('scanner:found', scanner.getScannerInfo());

    return scanner;
  }

  /**
   * Add a printer manually (without discovery)
   */
  public async addPrinter(
    address: string,
    port: number = 631,
    name?: string,
    ippPath?: string
  ): Promise<Printer> {
    const id = `manual:ipp:${address}:${port}`;

    // Check if already exists
    if (this.printers.has(id)) {
      return this.printers.get(id)!;
    }

    const printer = Printer.fromDiscovery(
      {
        id,
        name: name ?? `Printer at ${address}`,
        address,
        port,
        txtRecords: ippPath ? { rp: ippPath } : {},
      },
      this.options.enableRetry ? this.retryOptions : undefined
    );

    // Try to connect to validate
    await printer.connect();

    this.printers.set(id, printer);
    this.emit('printer:found', printer.getPrinterInfo());

    return printer;
  }

  /**
   * Get the NetworkScanner instance for advanced control
   */
  public get networkScanner(): NetworkScanner {
    if (!this._networkScanner) {
      this._networkScanner = new NetworkScanner();
      this.setupNetworkScannerEvents();
    }
    return this._networkScanner;
  }

  /**
   * Setup event forwarding from network scanner
   */
  private setupNetworkScannerEvents(): void {
    if (!this._networkScanner) return;

    this._networkScanner.on('device:found', (result: INetworkScanResult) => {
      this.emit('network:device:found', result);
    });

    this._networkScanner.on('progress', (progress) => {
      this.emit('network:progress', progress);
    });

    this._networkScanner.on('complete', (results) => {
      this.emit('network:complete', results);
    });

    this._networkScanner.on('error', (error) => {
      this.emit('error', error);
    });
  }

  /**
   * Scan a network range for devices (IP-based, not mDNS)
   * Found devices are automatically added to the device manager
   */
  public async scanNetwork(
    options: INetworkScanOptions
  ): Promise<{ scanners: Scanner[]; printers: Printer[] }> {
    const results = await this.networkScanner.scan(options);
    const foundScanners: Scanner[] = [];
    const foundPrinters: Printer[] = [];

    for (const result of results) {
      for (const device of result.devices) {
        try {
          if (device.type === 'scanner') {
            if (device.protocol === 'escl') {
              const scanner = await this.addScanner(
                result.address,
                device.port,
                'escl',
                device.name
              );
              foundScanners.push(scanner);
            } else if (device.protocol === 'sane') {
              const scanner = await this.addScanner(
                result.address,
                device.port,
                'sane',
                device.name
              );
              foundScanners.push(scanner);
            }
          } else if (device.type === 'printer') {
            if (device.protocol === 'ipp') {
              const printer = await this.addPrinter(
                result.address,
                device.port,
                device.name
              );
              foundPrinters.push(printer);
            }
            // JetDirect printers don't have a protocol handler yet
          }
        } catch (error) {
          // Device could not be added (connection failed, etc.)
          this.emit('error', error instanceof Error ? error : new Error(String(error)));
        }
      }
    }

    return { scanners: foundScanners, printers: foundPrinters };
  }

  /**
   * Cancel an ongoing network scan
   */
  public async cancelNetworkScan(): Promise<void> {
    if (this._networkScanner) {
      await this._networkScanner.cancel();
    }
  }

  /**
   * Check if a network scan is in progress
   */
  public get isNetworkScanning(): boolean {
    return this._networkScanner?.isScanning ?? false;
  }

  /**
   * Remove a device
   */
  public async removeDevice(id: string): Promise<boolean> {
    const scanner = this.scanners.get(id);
    if (scanner) {
      if (scanner.isConnected) {
        await scanner.disconnect();
      }
      this.scanners.delete(id);
      this.emit('scanner:lost', id);
      return true;
    }

    const printer = this.printers.get(id);
    if (printer) {
      if (printer.isConnected) {
        await printer.disconnect();
      }
      this.printers.delete(id);
      this.emit('printer:lost', id);
      return true;
    }

    return false;
  }

  /**
   * Disconnect all devices
   */
  public async disconnectAll(): Promise<void> {
    const disconnectPromises: Promise<void>[] = [];

    for (const scanner of this.scanners.values()) {
      if (scanner.isConnected) {
        disconnectPromises.push(scanner.disconnect().catch(() => {}));
      }
    }

    for (const printer of this.printers.values()) {
      if (printer.isConnected) {
        disconnectPromises.push(printer.disconnect().catch(() => {}));
      }
    }

    await Promise.all(disconnectPromises);
  }

  /**
   * Stop discovery and disconnect all devices
   */
  public async shutdown(): Promise<void> {
    await this.stopDiscovery();
    await this.disconnectAll();
    this.scanners.clear();
    this.printers.clear();
  }

  /**
   * Refresh status of all devices
   */
  public async refreshAllStatus(): Promise<void> {
    const refreshPromises: Promise<void>[] = [];

    for (const scanner of this.scanners.values()) {
      if (scanner.isConnected) {
        refreshPromises.push(
          scanner.refreshStatus().catch((error) => {
            this.emit('error', error);
          })
        );
      }
    }

    for (const printer of this.printers.values()) {
      if (printer.isConnected) {
        refreshPromises.push(
          printer.refreshStatus().catch((error) => {
            this.emit('error', error);
          })
        );
      }
    }

    await Promise.all(refreshPromises);
  }
}

export { MdnsDiscovery, NetworkScanner, Scanner, Printer, SERVICE_TYPES };