"""
Utility functions for the Flask job application system.
"""
from datetime import datetime
from flask import session, current_app


def check_rate_limit():
    """
    Check if user is submitting forms too quickly.
    Returns (allowed: bool, wait_seconds: int)
    """
    now = datetime.now()
    last_submit_str = session.get('last_submission_time')

    if last_submit_str:
        try:
            last_submit = datetime.fromisoformat(last_submit_str)
            elapsed = (now - last_submit).total_seconds()

            if elapsed < current_app.config['RATE_LIMIT_SECONDS']:
                wait_seconds = int(current_app.config['RATE_LIMIT_SECONDS'] - elapsed) + 1
                return False, wait_seconds
        except (ValueError, TypeError):
            # Invalid timestamp, allow submission
            pass

    # Update last submission time
    session['last_submission_time'] = now.isoformat()
    return True, 0