#!/usr/bin/env python3
"""
Email List Validator - Bulk Email Validation
Validates emails with syntax and MX checks
"""
import re
import dns.resolver
from concurrent.futures import ThreadPoolExecutor

EMAIL_PATTERN = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'

def validate_syntax(email):
    """Check email syntax with regex"""
    return bool(re.match(EMAIL_PATTERN, email))

def check_mx_record(domain):
    """Check if domain has MX records"""
    try:
        dns.resolver.resolve(domain, 'MX')
        return True
    except:
        return False

def validate_email(email):
    """Full email validation"""
    email = email.strip().lower()

    if not validate_syntax(email):
        return {'email': email, 'valid': False, 'reason': 'Invalid syntax'}

    domain = email.split('@')[1]

    if not check_mx_record(domain):
        return {'email': email, 'valid': False, 'reason': 'No MX records'}

    return {'email': email, 'valid': True, 'reason': 'Valid'}

def validate_bulk(emails, max_workers=50):
    """Validate multiple emails in parallel"""
    with ThreadPoolExecutor(max_workers=max_workers) as executor:
        results = list(executor.map(validate_email, emails))
    return results

if __name__ == '__main__':
    import sys
    emails = open(sys.argv[1]).read().splitlines()
    results = validate_bulk(emails)

    valid = sum(1 for r in results if r['valid'])
    print(f"Valid: {valid}/{len(results)}")