import { logger } from '@/utils/logger';

/**
 * First Time Detection Utility
 * Action 10.4.1.4: Add "first time" detection
 *
 * Provides utilities to detect first-time users and track onboarding completion
 * Uses localStorage to persist state across sessions
 */

const FIRST_TIME_KEY = 'veza_first_time';
const ONBOARDING_COMPLETED_KEY = 'veza_onboarding_completed';

/**
 * Check if this is the user's first time using the application
 * @returns True if first time, false otherwise
 */
export function isFirstTime(): boolean {
  if (typeof window === 'undefined') {
    // Server-side rendering - assume not first time
    return false;
  }

  try {
    const value = localStorage.getItem(FIRST_TIME_KEY);
    // If the key doesn't exist, it's the first time
    return value === null;
  } catch (error) {
    logger.warn('Error checking first time status', {
      error: error instanceof Error ? error.message : String(error),
      stack: error instanceof Error ? error.stack : undefined,
    });
    // On error, assume not first time to avoid showing onboarding repeatedly
    return false;
  }
}

/**
 * Mark the user as no longer first-time
 * This should be called after the user has completed onboarding or interacted with the app
 */
export function markAsNotFirstTime(): void {
  if (typeof window === 'undefined') {
    return;
  }

  try {
    localStorage.setItem(FIRST_TIME_KEY, 'false');
    logger.debug('User marked as not first-time');
  } catch (error) {
    logger.warn('Error marking user as not first-time', {
      error: error instanceof Error ? error.message : String(error),
      stack: error instanceof Error ? error.stack : undefined,
    });
  }
}

/**
 * Check if onboarding has been completed
 * @returns True if onboarding was completed, false otherwise
 */
export function isOnboardingCompleted(): boolean {
  if (typeof window === 'undefined') {
    return false;
  }

  try {
    const value = localStorage.getItem(ONBOARDING_COMPLETED_KEY);
    return value === 'true';
  } catch (error) {
    logger.warn('Error checking onboarding completion status', {
      error: error instanceof Error ? error.message : String(error),
      stack: error instanceof Error ? error.stack : undefined,
    });
    return false;
  }
}

/**
 * Mark onboarding as completed
 * This should be called when the user completes the onboarding flow
 */
export function markOnboardingCompleted(): void {
  if (typeof window === 'undefined') {
    return;
  }

  try {
    localStorage.setItem(ONBOARDING_COMPLETED_KEY, 'true');
    // Also mark as not first-time when onboarding is completed
    markAsNotFirstTime();
    logger.debug('Onboarding marked as completed');
  } catch (error) {
    logger.warn('Error marking onboarding as completed', {
      error: error instanceof Error ? error.message : String(error),
      stack: error instanceof Error ? error.stack : undefined,
    });
  }
}

/**
 * Reset first-time detection (useful for testing or admin purposes)
 * This will make the user appear as first-time again
 */
export function resetFirstTimeDetection(): void {
  if (typeof window === 'undefined') {
    return;
  }

  try {
    localStorage.removeItem(FIRST_TIME_KEY);
    localStorage.removeItem(ONBOARDING_COMPLETED_KEY);
    logger.debug('First-time detection reset');
  } catch (error) {
    logger.warn('Error resetting first-time detection', {
      error: error instanceof Error ? error.message : String(error),
      stack: error instanceof Error ? error.stack : undefined,
    });
  }
}