import { IAutomationEngine, ValidationResult } from '../../../../application/ports/IAutomationEngine';
import { HostedSessionConfig } from '../../../../domain/entities/HostedSessionConfig';
import { StepId } from '../../../../domain/value-objects/StepId';
import type { IBrowserAutomation } from '../../../../application/ports/IScreenAutomation';
import { ISessionRepository } from '../../../../application/ports/ISessionRepository';
import { StepTransitionValidator } from '../../../../domain/services/StepTransitionValidator';

/**
 * Real Automation Engine Adapter.
 *
 * Orchestrates the automation workflow by:
 * 1. Validating session configuration
 * 2. Executing each step using real browser automation
 * 3. Managing session state transitions
 *
 * This is a REAL implementation that uses actual automation,
 * not a mock. Historically delegated to legacy native screen
 * automation adapters, but those are no longer part of the
 * supported stack.
 *
 * @deprecated This adapter should be updated to use Playwright
 * browser automation when available. See docs/ARCHITECTURE.md
 * for the updated automation strategy.
 */
export class AutomationEngineAdapter implements IAutomationEngine {
  private isRunning = false;
  private automationPromise: Promise<void> | null = null;

  constructor(
    private readonly browserAutomation: IBrowserAutomation,
    private readonly sessionRepository: ISessionRepository
  ) {}

  async validateConfiguration(config: HostedSessionConfig): Promise<ValidationResult> {
    if (!config.sessionName || config.sessionName.trim() === '') {
      return { isValid: false, error: 'Session name is required' };
    }
    if (!config.trackId || config.trackId.trim() === '') {
      return { isValid: false, error: 'Track ID is required' };
    }
    if (!config.carIds || config.carIds.length === 0) {
      return { isValid: false, error: 'At least one car must be selected' };
    }
    return { isValid: true };
  }

  async executeStep(stepId: StepId, config: HostedSessionConfig): Promise<void> {
    const sessions = await this.sessionRepository.findAll();
    const session = sessions[0];
    if (!session) {
      throw new Error('No active session found');
    }

    // Start session if it's at step 1 and pending
    if (session.state.isPending() && stepId.value === 1) {
      session.start();
      await this.sessionRepository.update(session);
      
      // Start automated progression
      this.startAutomation(config);
    }
  }

  private startAutomation(config: HostedSessionConfig): void {
    if (this.isRunning) {
      return;
    }
    this.isRunning = true;
    this.automationPromise = this.runAutomationLoop(config);
  }

  private async runAutomationLoop(config: HostedSessionConfig): Promise<void> {
    while (this.isRunning) {
      try {
        const sessions = await this.sessionRepository.findAll();
        const session = sessions[0];
        
        if (!session || !session.state.isInProgress()) {
          this.isRunning = false;
          return;
        }

        const currentStep = session.currentStep;
        
        // Execute current step using the browser automation
        if (this.browserAutomation.executeStep) {
          const result = await this.browserAutomation.executeStep(currentStep, config as unknown as Record<string, unknown>);
          if (!result.success) {
            const stepDescription = StepTransitionValidator.getStepDescription(currentStep);
            const errorMessage = `Step ${currentStep.value} (${stepDescription}) failed: ${result.error}`;
            console.error(errorMessage);
            
            // Stop automation and mark session as failed
            this.isRunning = false;
            
            session.fail(errorMessage);
            await this.sessionRepository.update(session);
            return;
          }
        } else {
          // Fallback for adapters without executeStep
          await this.browserAutomation.navigateToPage(`step-${currentStep.value}`);
        }
        
        // Transition to next step
        if (!currentStep.isFinalStep()) {
          session.transitionToStep(currentStep.next());
          await this.sessionRepository.update(session);
          
          // If we just transitioned to the final step, execute it before stopping
          const nextStep = session.currentStep;
          if (nextStep.isFinalStep()) {
            // Execute final step handler
            if (this.browserAutomation.executeStep) {
              const result = await this.browserAutomation.executeStep(nextStep, config as unknown as Record<string, unknown>);
              if (!result.success) {
                const stepDescription = StepTransitionValidator.getStepDescription(nextStep);
                const errorMessage = `Step ${nextStep.value} (${stepDescription}) failed: ${result.error}`;
                console.error(errorMessage);
                // Don't try to fail terminal session - just log the error
                // Session is already in STOPPED_AT_STEP_18 state after transitionToStep()
              }
            }
            // Stop after final step
            this.isRunning = false;
            return;
          }
        } else {
          // Current step is already final - stop
          this.isRunning = false;
          return;
        }

        // Wait before next iteration
        await this.delay(500);
      } catch (error) {
        console.error('Automation error:', error);
        this.isRunning = false;
        return;
      }
    }
  }

  private delay(ms: number): Promise<void> {
    return new Promise(resolve => setTimeout(resolve, ms));
  }

  public stopAutomation(): void {
    this.isRunning = false;
    this.automationPromise = null;
  }
}