from netmiko import ConnectHandler, exceptions
from config import cfg
import logging as log
import os
import re
from repo import add_file_and_commit


def read_device_list() -> dict[str, dict[str, str]]:

    bcp_dev_file = os.path.join(
        os.path.join(
            os.path.abspath(os.path.dirname(__file__)),
            "config",
        ),
        cfg.bcp.file,
    )
    log.info('start load device from "%s"', bcp_dev_file)

    all_devices = {}
    with open(bcp_dev_file, "r") as f:
        dev_list_from_file: list[str] = f.read().splitlines()
    for line in dev_list_from_file:
        match = re.match(
            cfg.bcp.pattern,
            line,
        )
        if match:
            all_devices[match.group("name")] = {
                "name": match.group("name"),
                "ip": match.group("ip"),
                "vendor": match.group("vendor"),
                "model": match.group("model"),
            }
    log.info("success load %s devices", len(all_devices))
    return all_devices


def connect_to_device(vendor: str, host: str, name: str="") -> ConnectHandler:
    log_dir: str = os.path.join(os.path.abspath(os.path.dirname(__file__)), "logs")

    conn_conf: dict = {
        "host": host,
        "username": cfg.net_dev.user,
        "password": cfg.net_dev.pwd,
        "port": cfg.net_dev.ssh_port,
    }
    if cfg.net_dev.debug:
        conn_conf["session_log"] = os.path.join(log_dir, 'session_log.log')
    if vendor.lower() == "mikrotik":
        conn_conf["device_type"] = "mikrotik_routeros"
        if cfg.net_dev.domain is not None:
            conn_conf["username"] = cfg.net_dev.user + "@" + cfg.net_dev.domain
    elif vendor.lower() == "cisco_sb":
        conn_conf["device_type"] = "cisco_s300"
        if cfg.net_dev.domain is not None:
            conn_conf["username"] = cfg.net_dev.domain + "\\" + cfg.net_dev.user
    elif vendor.lower() == "snr":
        conn_conf["device_type"] = "cisco_ios"
        if cfg.net_dev.domain is not None:
            conn_conf["username"] = cfg.net_dev.domain + "\\" + cfg.net_dev.user
    elif vendor.lower() == "cisco":
        conn_conf["device_type"] = "cisco_ios"
        if cfg.net_dev.domain is not None:
            conn_conf["username"] = cfg.net_dev.domain + "\\" + cfg.net_dev.user
    try:
        connection: ConnectHandler = ConnectHandler(**conn_conf)
        log.info("connect to %s %s", name, host)
        return connection
    except exceptions.NetmikoAuthenticationException:
        log.warning("Authentication error %s %s ", name, host)
    except exceptions.NetmikoTimeoutException:
        log.warning("Connection time out error %s %s ", name, host)
    except Exception as e:
        log.warning("Connection error %s %s: %s", name, host, e)


def send_command(connection: ConnectHandler, command: str) -> str:
    log.info("send command")
    try:
        result: str = connection.send_command(command, read_timeout=cfg.net_dev.read_timeout, delay_factor=2)
        log.info('command send success')
    except exceptions.NetmikoTimeoutException:
        result = "NetmikoTimeoutException"
    except exceptions.ReadTimeout:
            result = "ReadTimeout"
    return result


def save_mikrotik_bcp(host: str, name: str) -> None:

    connection = connect_to_device(
        vendor="mikrotik",
        host=host,
        name=name,
    )
    if connection is None:
        return
    result = send_command(connection, "export terse show-sensitive")
    connection.disconnect()
    log.info("disconnected from %r", name)
    if result == "NetmikoTimeoutException":
        log.warning("Timeout error %r", name)
        return
    elif result == "ReadTimeout":
        log.warning("Timeout read config from %r", name)
        return
    result = "\n".join(result.split("\n")[1:])
    with open(os.path.join(cfg.bcp.dir, name), "w") as f:
        f.write(result)
    log.info("Backup saved")

    add_file_and_commit(file_name=name)


def save_snr_bcp(host: str, name: str) -> None:
    connection = connect_to_device(
        vendor="snr",
        host=host,
    )
    if connection is None:
        return
    result = send_command(connection, "show running-config")
    connection.disconnect()
    log.info("disconnected from %r", name)
    if result == "NetmikoTimeoutException":
        log.warning("Timeout error %r", name)
        return
    elif result == "ReadTimeout":
        log.warning("Timeout read config from %r", name)
        return
    with open(os.path.join(cfg.bcp.dir, name), "w") as f:
        f.write(result)
    log.info("Backup saved")

    add_file_and_commit(file_name=name)


def save_cisco_sb_bcp(host: str, name: str) -> None:
    connection = connect_to_device(
        vendor="cisco_sb",
        host=host,
    )
    if connection is None:
        return
    result = send_command(connection, "show running-config")
    connection.disconnect()
    log.info("disconnected from %s", name)
    if result == "NetmikoTimeoutException":
        log.warning("Timeout error %r", name)
        return
    elif result == "ReadTimeout":
        log.warning("Timeout read config from %r", name)
        return
    with open(os.path.join(cfg.bcp.dir, name), "w") as f:
        f.write(result)
    log.info("Backup saved")
    add_file_and_commit(file_name=name)


def save_cisco_bcp(host: str, name: str) -> None:
    connection = connect_to_device(
        vendor="cisco",
        host=host,
    )
    if connection is None:
        return
    result = send_command(connection, "show running-config")
    connection.disconnect()
    log.info("disconnected from %r", name)
    if result == "NetmikoTimeoutException":
        log.warning("Timeout error %r", name)
        return
    elif result == "ReadTimeout":
        log.warning("Timeout read config from %r", name)
        return
    with open(os.path.join(cfg.bcp.dir, name), "w") as f:
        f.write(result)
    log.info("Backup saved")
    add_file_and_commit(file_name=name)