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

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

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:
        return {
            'success': False,
            'error': f'Autenticazione SMTP fallita: {str(e)}'
        }
    except smtplib.SMTPException as e:
        return {
            'success': False,
            'error': f'Errore SMTP: {str(e)}'
        }
    except Exception as e:
        return {
            'success': False,
            'error': f'Errore generico: {str(e)}'
        }

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:
            print(json.dumps({
                'success': False,
                'error': 'Parametri mancanti: to, subject, html sono obbligatori'
            }))
            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:
        print(json.dumps({
            'success': False,
            'error': f'JSON non valido: {str(e)}'
        }))
        sys.exit(1)
    except Exception as e:
        print(json.dumps({
            'success': False,
            'error': f'Errore: {str(e)}'
        }))
        sys.exit(1)

if __name__ == '__main__':
    main()