#!/usr/bin/env python3
"""Simple email validator utility."""

import re

# RFC 5322 inspired regex (simplified but practical)
EMAIL_REGEX = re.compile(
    r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
)

def is_valid_email(email: str) -> bool:
    """Return True if email matches basic valid email pattern."""
    if not email or not isinstance(email, str):
        return False
    return bool(EMAIL_REGEX.match(email))

def validate_email(email: str) -> dict:
    """Return validation result with details."""
    return {
        "email": email,
        "valid": is_valid_email(email),
        "reason": "Valid email format" if is_valid_email(email) else "Invalid email format"
    }

if __name__ == "__main__":
    import sys
    if len(sys.argv) > 1:
        for email in sys.argv[1:]:
            result = validate_email(email)
            print(f"{email}: {result['valid']} - {result['reason']}")