/**
 * Factory for creating identity manager instances
 */

import { LoggerComponent } from 'ior:gitea:gitea.metatrom.net:universal-components/logger@1.0.0';
import { AsyncStorageAdapter } from './implementations/AsyncStorageAdapter';
import { IdentityManager } from './implementations/IdentityManager';
import type {
  IdentityConfig,
  IIdentityFactory,
  IIdentityManager,
  IIdentityStorage,
} from './interfaces/IIdentity';

// Platform interface for dependency injection
interface IPlatform {
  OS: string;
}

export class IdentityFactory implements IIdentityFactory {
  private static instance?: IdentityFactory;
  private identityManager?: IIdentityManager;
  private storage?: IIdentityStorage;
  private logger = new LoggerComponent('IdentityFactory');
  private platform?: IPlatform;
  private asyncStorage?: any;

  private constructor(platform?: IPlatform, asyncStorage?: any) {
    this.platform = platform;
    this.asyncStorage = asyncStorage;
  }

  static getInstance(platform?: IPlatform, asyncStorage?: any): IdentityFactory {
    if (!IdentityFactory.instance) {
      IdentityFactory.instance = new IdentityFactory(platform, asyncStorage);
    }
    return IdentityFactory.instance;
  }

  create(config?: IdentityConfig): IIdentityManager {
    // Use singleton pattern for identity manager
    if (!this.identityManager) {
      const storage = this.getStorage();

      // Enhanced config with platform-specific device name provider
      const enhancedConfig: IdentityConfig = {
        ...config,
        deviceNameProvider: config?.deviceNameProvider || this.getDeviceNameProvider(),
      };

      this.identityManager = new IdentityManager(storage, enhancedConfig);
    }

    return this.identityManager;
  }

  private getStorage(): IIdentityStorage {
    if (!this.storage) {
      if (!this.asyncStorage) {
        throw new Error('AsyncStorage not provided. Please provide AsyncStorage when creating the factory.');
      }
      // Use AsyncStorage for React Native
      this.storage = new AsyncStorageAdapter(this.asyncStorage);
    }
    return this.storage;
  }

  private getDeviceNameProvider(): () => Promise<string> {
    return async () => {
      try {
        // Try to use react-native-device-info if available
        const DeviceInfo = require('react-native-device-info').default;
        if (DeviceInfo?.getDeviceName) {
          const name = await DeviceInfo.getDeviceName();
          return name || this.getFallbackDeviceName();
        }
      } catch (_error) {
        // Module not available, use fallback
        this.logger.debug('react-native-device-info not available, using fallback device name');
      }

      return this.getFallbackDeviceName();
    };
  }

  private getFallbackDeviceName(): string {
    const platform = this.platform?.OS || 'unknown';
    const timestamp = Date.now().toString(36).substring(-4);

    switch (platform) {
      case 'ios':
        return `iPhone-${timestamp}`;
      case 'android':
        return `Android-${timestamp}`;
      default:
        return `Device-${timestamp}`;
    }
  }

  /**
   * Reset the singleton instance (useful for testing)
   */
  static reset(): void {
    if (IdentityFactory.instance?.identityManager) {
      IdentityFactory.instance.identityManager = undefined;
    }
    IdentityFactory.instance = undefined;
  }
}

// Export singleton instance creator with dependency injection
export const createIdentityManager = (
  config?: IdentityConfig,
  platform?: IPlatform,
  asyncStorage?: any
): IIdentityManager => {
  return IdentityFactory.getInstance(platform, asyncStorage).create(config);
};