#!/usr/bin/env python3
"""
Script Python per invio email SMTP
Legge le credenziali da config.php e invia email tramite Gmail
Log solo in caso di errore
"""

import sys
import json
import re
import smtplib
import logging
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from pathlib import Path
from datetime import datetime

# Configura logging solo per errori
log_file = Path(__file__).parent / 'logs' / 'email_errors.log'
log_file.parent.mkdir(exist_ok=True)

logging.basicConfig(
    filename=str(log_file),
    level=logging.ERROR,
    format='%(asctime)s - %(levelname)s - %(message)s',
    datefmt='%Y-%m-%d %H:%M:%S'
)

def parse_php_config(config_path):
    """Estrae le configurazioni SMTP dal file config.php"""
    config = {}
    
    try:
        with open(config_path, 'r', encoding='utf-8') as f:
            content = f.read()
            
        # Estrai le define con regex
        patterns = {
            'SMTP_HOST': r"define\('SMTP_HOST',\s*'([^']+)'\)",
            'SMTP_PORT': r"define\('SMTP_PORT',\s*(\d+)\)",
            'SMTP_USERNAME': r"define\('SMTP_USERNAME',\s*'([^']+)'\)",
            'SMTP_PASSWORD': r"define\('SMTP_PASSWORD',\s*'([^']+)'\)",
            'SMTP_ENCRYPTION': r"define\('SMTP_ENCRYPTION',\s*'([^']+)'\)",
            'MAIL_FROM': r"define\('MAIL_FROM',\s*'([^']+)'\)",
            'MAIL_FROM_NAME': r"define\('MAIL_FROM_NAME',\s*'([^']+)'\)",
        }
        
        for key, pattern in patterns.items():
            match = re.search(pattern, content)
            if match:
                value = match.group(1)
                # Converti porta in intero
                if key == 'SMTP_PORT':
                    config[key] = int(value)
                else:
                    config[key] = value
                    
        return config
    except Exception as e:
        print(json.dumps({
            'success': False,
            'error': f'Errore lettura config.php: {str(e)}'
        }))
        sys.exit(1)

def send_email(to_email, subject, html_body, config):
    """Invia email tramite SMTP"""
    try:
        # Crea messaggio
        msg = MIMEMultipart('alternative')
        msg['From'] = f"{config['MAIL_FROM_NAME']} <{config['MAIL_FROM']}>"
        msg['To'] = to_email
        msg['Subject'] = subject
        
        # Aggiungi corpo HTML
        html_part = MIMEText(html_body, 'html', 'utf-8')
        msg.attach(html_part)
        
        # Connetti al server SMTP
        if config['SMTP_ENCRYPTION'] == 'ssl':
            # SSL diretto (porta 465)
            server = smtplib.SMTP_SSL(config['SMTP_HOST'], config['SMTP_PORT'], timeout=30)
        else:
            # TLS con STARTTLS (porta 587)
            server = smtplib.SMTP(config['SMTP_HOST'], config['SMTP_PORT'], timeout=30)
            server.ehlo()
            server.starttls()
            server.ehlo()
        
        # Login
        server.login(config['SMTP_USERNAME'], config['SMTP_PASSWORD'])
        
        # Invia email
        server.send_message(msg)
        server.quit()
        
        return {
            'success': True,
            'message': f'Email inviata con successo a {to_email}'
        }
        
    except smtplib.SMTPAuthenticationError as e:
        error_msg = f'Autenticazione SMTP fallita per {to_email}: {str(e)}'
        logging.error(error_msg)
        return {
            'success': False,
            'error': error_msg
        }
    except smtplib.SMTPException as e:
        error_msg = f'Errore SMTP invio a {to_email}: {str(e)}'
        logging.error(error_msg)
        return {
            'success': False,
            'error': error_msg
        }
    except Exception as e:
        error_msg = f'Errore generico invio a {to_email}: {str(e)}'
        logging.error(error_msg)
        return {
            'success': False,
            'error': error_msg
        }

def main():
    """Funzione principale"""
    if len(sys.argv) < 2:
        print(json.dumps({
            'success': False,
            'error': 'Uso: python send_email.py <json_data>'
        }))
        sys.exit(1)
    
    try:
        # Parse input JSON
        data = json.loads(sys.argv[1])
        
        if 'to' not in data or 'subject' not in data or 'html' not in data:
            error = 'Parametri mancanti: to, subject, html sono obbligatori'
            logging.error(error)
            print(json.dumps({
                'success': False,
                'error': error
            }))
            sys.exit(1)
        
        # Leggi configurazione
        script_dir = Path(__file__).parent
        config_path = script_dir / 'includes' / 'config.php'
        config = parse_php_config(config_path)
        
        # Invia email
        result = send_email(data['to'], data['subject'], data['html'], config)
        print(json.dumps(result))
        
        sys.exit(0 if result['success'] else 1)
        
    except json.JSONDecodeError as e:
        error = f'JSON non valido: {str(e)}'
        logging.error(error)
        print(json.dumps({
            'success': False,
            'error': error
        }))
        sys.exit(1)
    except Exception as e:
        error = f'Errore: {str(e)}'
        logging.error(error)
        print(json.dumps({
            'success': False,
            'error': error
        }))
        sys.exit(1)

if __name__ == '__main__':
    main()