import { InMemorySessionRepository } from '@/packages/infrastructure/repositories/InMemorySessionRepository';
import { MockBrowserAutomationAdapter } from '@/packages/infrastructure/adapters/automation/MockBrowserAutomationAdapter';
import { BrowserDevToolsAdapter } from '@/packages/infrastructure/adapters/automation/BrowserDevToolsAdapter';
import { NutJsAutomationAdapter } from '@/packages/infrastructure/adapters/automation/NutJsAutomationAdapter';
import { MockAutomationEngineAdapter } from '@/packages/infrastructure/adapters/automation/MockAutomationEngineAdapter';
import { StartAutomationSessionUseCase } from '@/packages/application/use-cases/StartAutomationSessionUseCase';
import { loadAutomationConfig, AutomationMode } from '@/packages/infrastructure/config';
import type { ISessionRepository } from '@/packages/application/ports/ISessionRepository';
import type { IBrowserAutomation } from '@/packages/application/ports/IBrowserAutomation';
import type { IAutomationEngine } from '@/packages/application/ports/IAutomationEngine';

export interface BrowserConnectionResult {
  success: boolean;
  error?: string;
}

/**
 * Create browser automation adapter based on configuration mode.
 *
 * @param mode - The automation mode from configuration
 * @returns IBrowserAutomation adapter instance
 */
function createBrowserAutomationAdapter(mode: AutomationMode): IBrowserAutomation {
  const config = loadAutomationConfig();
  
  switch (mode) {
    case 'dev':
      return new BrowserDevToolsAdapter({
        debuggingPort: config.devTools?.debuggingPort,
        browserWSEndpoint: config.devTools?.browserWSEndpoint,
        defaultTimeout: config.defaultTimeout,
      });
    
    case 'production':
      return new NutJsAutomationAdapter({
        mouseSpeed: config.nutJs?.mouseSpeed,
        keyboardDelay: config.nutJs?.keyboardDelay,
        defaultTimeout: config.defaultTimeout,
      });
    
    case 'mock':
    default:
      return new MockBrowserAutomationAdapter();
  }
}

export class DIContainer {
  private static instance: DIContainer;
  
  private sessionRepository: ISessionRepository;
  private browserAutomation: IBrowserAutomation;
  private automationEngine: IAutomationEngine;
  private startAutomationUseCase: StartAutomationSessionUseCase;
  private automationMode: AutomationMode;

  private constructor() {
    const config = loadAutomationConfig();
    this.automationMode = config.mode;
    
    this.sessionRepository = new InMemorySessionRepository();
    this.browserAutomation = createBrowserAutomationAdapter(config.mode);
    this.automationEngine = new MockAutomationEngineAdapter(
      this.browserAutomation,
      this.sessionRepository
    );
    this.startAutomationUseCase = new StartAutomationSessionUseCase(
      this.automationEngine,
      this.browserAutomation,
      this.sessionRepository
    );
  }

  public static getInstance(): DIContainer {
    if (!DIContainer.instance) {
      DIContainer.instance = new DIContainer();
    }
    return DIContainer.instance;
  }

  public getStartAutomationUseCase(): StartAutomationSessionUseCase {
    return this.startAutomationUseCase;
  }

  public getSessionRepository(): ISessionRepository {
    return this.sessionRepository;
  }

  public getAutomationEngine(): IAutomationEngine {
    return this.automationEngine;
  }

  public getAutomationMode(): AutomationMode {
    return this.automationMode;
  }

  public getBrowserAutomation(): IBrowserAutomation {
    return this.browserAutomation;
  }

  /**
   * Initialize browser connection for dev mode.
   * In dev mode, connects to the browser via Chrome DevTools Protocol.
   * In mock mode, returns success immediately (no connection needed).
   */
  public async initializeBrowserConnection(): Promise<BrowserConnectionResult> {
    if (this.automationMode === 'dev') {
      try {
        const devToolsAdapter = this.browserAutomation as BrowserDevToolsAdapter;
        await devToolsAdapter.connect();
        return { success: true };
      } catch (error) {
        return {
          success: false,
          error: error instanceof Error ? error.message : 'Failed to connect to browser'
        };
      }
    }
    if (this.automationMode === 'production') {
      try {
        const nutJsAdapter = this.browserAutomation as NutJsAutomationAdapter;
        const result = await nutJsAdapter.connect();
        if (!result.success) {
          return { success: false, error: result.error };
        }
        return { success: true };
      } catch (error) {
        return {
          success: false,
          error: error instanceof Error ? error.message : 'Failed to initialize nut.js'
        };
      }
    }
    return { success: true }; // Mock mode doesn't need connection
  }

  /**
   * Reset the singleton instance (useful for testing with different configurations).
   */
  public static resetInstance(): void {
    DIContainer.instance = undefined as unknown as DIContainer;
  }
}