#!.venv/bin/python
"""
Script per prelevare dati da MySQL e inviare comandi SITE FTP
"""

import logging
import sys
from ftplib import FTP

import mysql.connector

from utils.config import users_loader as setting
from utils.database.connection import connetti_db

# Configurazione logging
logging.basicConfig(level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s")
logger = logging.getLogger(__name__)

# Configurazione server FTP
FTP_CONFIG = {"host": "localhost", "user": "admin", "password": "batt1l0", "port": 2121}


def connect_ftp() -> FTP:
    """
    Establishes a connection to the FTP server using the predefined configuration.
    Returns:
        FTP: An active FTP connection object.
    """
    try:
        ftp = FTP()
        ftp.connect(FTP_CONFIG["host"], FTP_CONFIG["port"])
        ftp.login(FTP_CONFIG["user"], FTP_CONFIG["password"])
        logger.info("Connessione FTP stabilita")
        return ftp
    except Exception as e:  # pylint: disable=broad-except
        logger.error("Errore connessione FTP: %s", e)
        sys.exit(1)


def fetch_data_from_db(connection: mysql.connector.MySQLConnection) -> list[tuple]:
    """
    Fetches username and password data from the 'ftp_accounts' table in the database.

    Args:
        connection (mysql.connector.MySQLConnection): The database connection object.
    Returns:
        List[Tuple]: A list of tuples, where each tuple contains (username, password).
    """
    try:
        cursor = connection.cursor()

        # Modifica questa query secondo le tue esigenze
        query = """
        SELECT username, password
        FROM ase_lar.ftp_accounts
        """

        cursor.execute(query)
        results = cursor.fetchall()

        logger.info("Prelevate %s righe dal database", len(results))
        return results

    except mysql.connector.Error as e:
        logger.error("Errore query database: %s", e)
        return []
    finally:
        cursor.close()


def fetch_existing_users(connection: mysql.connector.MySQLConnection) -> dict[str, tuple]:
    """
    Fetches existing FTP users from virtusers table.

    Args:
        connection (mysql.connector.MySQLConnection): The database connection object.
    Returns:
        dict: Dictionary mapping username to (is_enabled, has_matching_password).
              is_enabled is True if disabled_at is NULL.
    """
    try:
        cursor = connection.cursor()
        query = """
        SELECT ftpuser, disabled_at
        FROM ase_lar.virtusers
        """
        cursor.execute(query)
        results = cursor.fetchall()

        # Create dictionary: username -> is_enabled
        users_dict = {username: (disabled_at is None) for username, disabled_at in results}

        logger.info("Trovati %s utenti esistenti in virtusers", len(users_dict))
        return users_dict

    except mysql.connector.Error as e:
        logger.error("Errore query database virtusers: %s", e)
        return {}
    finally:
        cursor.close()


def send_site_command(ftp: FTP, command: str) -> bool:
    """
    Sends a SITE command to the FTP server.

    Args:
        ftp (FTP): The FTP connection object.
        command (str): The SITE command string to send (e.g., "ADDU username password").
    Returns:
        bool: True if the command was sent successfully, False otherwise.
    """
    try:
        # Il comando SITE viene inviato usando sendcmd
        response = ftp.sendcmd(f"SITE {command}")
        logger.info("Comando SITE %s inviato. Risposta: %s", command, response)
        return True
    except Exception as e:  # pylint: disable=broad-except
        logger.error("Errore invio comando SITE %s: %s", command, e)
        return False


def main():
    """
    Main function to connect to the database, fetch FTP user data, and synchronize users to FTP server.
    This function is idempotent - it can be run multiple times safely:
    - If user exists and is enabled: skips
    - If user exists but is disabled: enables it (SITE ENAU)
    - If user doesn't exist: creates it (SITE ADDU)
    """
    logger.info("Avvio script caricamento utenti FTP (idempotente)")
    cfg = setting.Config()

    # Connessioni
    db_connection = connetti_db(cfg)
    ftp_connection = connect_ftp()

    try:
        # Preleva utenti da sincronizzare
        users_to_sync = fetch_data_from_db(db_connection)

        if not users_to_sync:
            logger.warning("Nessun utente da sincronizzare nel database ftp_accounts")
            return

        # Preleva utenti già esistenti
        existing_users = fetch_existing_users(db_connection)

        added_count = 0
        enabled_count = 0
        skipped_count = 0
        error_count = 0

        # Processa ogni utente
        for row in users_to_sync:
            username, password = row

            if username in existing_users:
                is_enabled = existing_users[username]

                if is_enabled:
                    # Utente già esiste ed è abilitato - skip
                    logger.info("Utente %s già esiste ed è abilitato - skip", username)
                    skipped_count += 1
                else:
                    # Utente esiste ma è disabilitato - riabilita
                    logger.info("Utente %s esiste ma è disabilitato - riabilito con SITE ENAU", username)
                    ftp_site_command = f"enau {username}"

                    if send_site_command(ftp_connection, ftp_site_command):
                        enabled_count += 1
                    else:
                        error_count += 1
            else:
                # Utente non esiste - crea
                logger.info("Utente %s non esiste - creazione con SITE ADDU", username)
                ftp_site_command = f"addu {username} {password}"

                if send_site_command(ftp_connection, ftp_site_command):
                    added_count += 1
                else:
                    error_count += 1

        logger.info(
            "Elaborazione completata. Aggiunti: %s, Riabilitati: %s, Saltati: %s, Errori: %s",
            added_count,
            enabled_count,
            skipped_count,
            error_count
        )

    except Exception as e:  # pylint: disable=broad-except
        logger.error("Errore generale: %s", e)

    finally:
        # Chiudi connessioni
        try:
            ftp_connection.quit()
            logger.info("Connessione FTP chiusa")
        except Exception as e:  # pylint: disable=broad-except
            logger.error("Errore chiusura connessione FTP: %s", e)

        try:
            db_connection.close()
            logger.info("Connessione MySQL chiusa")
        except Exception as e:  # pylint: disable=broad-except
            logger.error("Errore chiusura connessione MySQL: %s", e)


if __name__ == "__main__":
    main()