"""
Module for the Flask app rendering and endpoints
"""

import sys
import logging
import argparse
from pathlib import Path
from functools import wraps
from grp import getgrall

import bjoern
from rascsi.return_codes import ReturnCodes
from werkzeug.utils import secure_filename
from simplepam import authenticate
from flask_babel import Babel, Locale, refresh, _

from flask import (
    Flask,
    render_template,
    request,
    flash,
    url_for,
    redirect,
    send_from_directory,
    make_response,
    session,
    abort,
    jsonify,
)

from rascsi.ractl_cmds import RaCtlCmds
from rascsi.file_cmds import FileCmds
from rascsi.sys_cmds import SysCmds

from rascsi.common_settings import (
    CFG_DIR,
    CONFIG_FILE_SUFFIX,
    PROPERTIES_SUFFIX,
    ARCHIVE_FILE_SUFFIXES,
    RESERVATIONS,
)

from return_code_mapper import ReturnCodeMapper
from socket_cmds_flask import SocketCmdsFlask

from web_utils import (
    sort_and_format_devices,
    get_valid_scsi_ids,
    map_device_types_and_names,
    get_device_name,
    map_image_file_descriptions,
    format_drive_properties,
    get_properties_by_drive_name,
    auth_active,
    is_bridge_configured,
    is_safe_path,
    upload_with_dropzonejs,
)
from settings import (
    WEB_DIR,
    AFP_DIR,
    MAX_FILE_SIZE,
    DEFAULT_CONFIG,
    DRIVE_PROPERTIES_FILE,
    AUTH_GROUP,
    LANGUAGES,
)


APP = Flask(__name__)
BABEL = Babel(APP)

def get_env_info():
    """
    Get information about the app/host environment
    """
    server_info = ractl_cmd.get_server_info()
    ip_addr, host = sys_cmd.get_ip_and_host()

    if "username" in session:
        username = session["username"]
    else:
        username = None

    return {
        "running_env": sys_cmd.running_env(),
        "username": username,
        "auth_active": auth_active(AUTH_GROUP)["status"],
        "ip_addr": ip_addr,
        "host": host,
        "free_disk_space": int(sys_cmd.disk_space()["free"] / 1024 / 1024),
        "locale": get_locale(),
        "version": server_info["version"],
        "image_dir": server_info["image_dir"],
        "netatalk_configured": sys_cmd.running_proc("afpd"),
        "macproxy_configured": sys_cmd.running_proc("macproxy"),
        "cd_suffixes": tuple(server_info["sccd"]),
        "rm_suffixes": tuple(server_info["scrm"]),
        "mo_suffixes": tuple(server_info["scmo"]),
    }


def response(
    template=None,
    message=None,
    redirect_url=None,
    error=False,
    status_code=200,
    **kwargs
):
    """
    Generates a HTML or JSON HTTP response
    """
    status = "error" if error else "success"

    if isinstance(message, list):
        messages = message
    elif message is None:
        messages = []
    else:
        messages = [(str(message), status)]

    if request.headers.get("accept") == "application/json":
        return jsonify({
            "status": status,
            "messages": [{"message": m, "category": c} for m, c in messages],
            "data": kwargs
        }), status_code

    if messages:
        for message, category in messages:
            flash(message, category)

    if template:
        kwargs["env"] = get_env_info()
        return render_template(template, **kwargs)

    if redirect_url:
        return redirect(url_for(redirect_url))
    return redirect(url_for("index"))


@BABEL.localeselector
def get_locale():
    """
    Uses the session language, or tries to detect based on accept-languages header
    """
    try:
        language = session["language"]
    except KeyError:
        language = ""
        logging.info("The default locale could not be detected. Falling back to English.")
    if language:
        return language
    # Hardcoded fallback to "en" when the user agent does not send an accept-language header
    language = request.accept_languages.best_match(LANGUAGES) or "en"
    return language


def get_supported_locales():
    """
    Returns a list of languages supported by the web UI
    """
    locales = [
        {"language": x.language, "display_name": x.display_name}
        for x in [*BABEL.list_translations(), Locale("en")]
        ]

    return sorted(locales, key=lambda x: x["language"])


# pylint: disable=too-many-locals
@APP.route("/")
def index():
    """
    Sets up data structures for and renders the index page
    """
    if not ractl_cmd.is_token_auth()["status"] and not APP.config["RASCSI_TOKEN"]:
        abort(
            403,
            _(
                "RaSCSI is password protected. "
                "Start the Web Interface with the --password parameter."
                ),
            )

    server_info = ractl_cmd.get_server_info()
    devices = ractl_cmd.list_devices()
    device_types = map_device_types_and_names(ractl_cmd.get_device_types()["device_types"])
    image_files = file_cmd.list_images()
    config_files = file_cmd.list_config_files()
    ip_addr, host = sys_cmd.get_ip_and_host()

    extended_image_files = []
    for image in image_files["files"]:
        if image["detected_type"] != "UNDEFINED":
            image["detected_type_name"] = device_types[image["detected_type"]]["name"]
        extended_image_files.append(image)

    attached_images = []
    units = 0
    # If there are more than 0 logical unit numbers, display in the Web UI
    for device in devices["device_list"]:
        attached_images.append(device["image"].replace(server_info["image_dir"] + "/", ""))
        units += int(device["unit"])

    reserved_scsi_ids = server_info["reserved_ids"]
    scsi_ids = get_valid_scsi_ids(devices["device_list"], reserved_scsi_ids)
    formatted_devices = sort_and_format_devices(devices["device_list"])

    image_suffixes_to_create = map_image_file_descriptions(
        # Here we strip out hdi and nhd, since they are proprietary PC-98 emulator formats
        # that require a particular header to work. We can't generate them on the fly.
        # We also reverse the resulting list, in order for hds to be the default in the UI.
        # This might break if something like 'hdt' etc. gets added in the future.
        sorted(
            [suffix for suffix in server_info["schd"] if suffix not in {"hdi", "nhd"}],
            reverse=True
            ) +
        server_info["scrm"] +
        server_info["scmo"]
        )

    valid_image_suffixes = (
        server_info["schd"] +
        server_info["scrm"] +
        server_info["scmo"] +
        server_info["sccd"]
        )

    return response(
        template="index.html",
        locales=get_supported_locales(),
        netinfo=ractl_cmd.get_network_info(),
        bridge_configured=sys_cmd.is_bridge_setup(),
        devices=formatted_devices,
        attached_images=attached_images,
        files=extended_image_files,
        config_files=config_files,
        device_types=device_types,
        scan_depth=server_info["scan_depth"],
        log_levels=server_info["log_levels"],
        current_log_level=server_info["current_log_level"],
        scsi_ids=scsi_ids,
        units=units,
        reserved_scsi_ids=reserved_scsi_ids,
        image_suffixes_to_create=image_suffixes_to_create,
        valid_image_suffixes=valid_image_suffixes,
        max_file_size=int(int(MAX_FILE_SIZE) / 1024 / 1024),
        drive_properties=format_drive_properties(APP.config["RASCSI_DRIVE_PROPERTIES"]),
        RESERVATIONS=RESERVATIONS,
        CFG_DIR=CFG_DIR,
        AFP_DIR=AFP_DIR,
        PROPERTIES_SUFFIX=PROPERTIES_SUFFIX,
        ARCHIVE_FILE_SUFFIXES=ARCHIVE_FILE_SUFFIXES,
        CONFIG_FILE_SUFFIX=CONFIG_FILE_SUFFIX,
        REMOVABLE_DEVICE_TYPES=ractl_cmd.get_removable_device_types(),
        DISK_DEVICE_TYPES=ractl_cmd.get_disk_device_types(),
        PERIPHERAL_DEVICE_TYPES=ractl_cmd.get_peripheral_device_types(),
    )


@APP.route("/env")
def env():
    """
    Shows information about the app/host environment
    """
    return response(**get_env_info())


@APP.route("/drive/list", methods=["GET"])
def drive_list():
    """
    Sets up the data structures and kicks off the rendering of the drive list page
    """

    return response(
        template="drives.html",
        files=file_cmd.list_images()["files"],
        drive_properties=format_drive_properties(APP.config["RASCSI_DRIVE_PROPERTIES"]),
        )


@APP.route("/login", methods=["POST"])
def login():
    """
    Uses simplepam to authenticate against Linux users
    """
    username = request.form["username"]
    password = request.form["password"]
    groups = [g.gr_name for g in getgrall() if username in g.gr_mem]

    if AUTH_GROUP in groups and authenticate(str(username), str(password)):
        session["username"] = request.form["username"]
        return response(env=get_env_info())

    return response(error=True, status_code=401, message=_(
        "You must log in with valid credentials for a user in the '%(group)s' group",
        group=AUTH_GROUP,
    ))


@APP.route("/logout")
def logout():
    """
    Removes the logged in user from the session
    """
    session.pop("username", None)
    return response()


@APP.route("/pwa/<path:pwa_path>")
def send_pwa_files(pwa_path):
    """
    Sets up mobile web resources
    """
    return send_from_directory("pwa", pwa_path)


def login_required(func):
    """
    Wrapper method for enabling authentication for an endpoint
    """
    @wraps(func)
    def decorated_function(*args, **kwargs):
        auth = auth_active(AUTH_GROUP)
        if auth["status"] and "username" not in session:
            return response(error=True, message=auth["msg"])
        return func(*args, **kwargs)
    return decorated_function


@APP.route("/drive/create", methods=["POST"])
@login_required
def drive_create():
    """
    Creates the image and properties file pair
    """
    drive_name = request.form.get("drive_name")
    file_name = Path(request.form.get("file_name")).name

    properties = get_properties_by_drive_name(
        APP.config["RASCSI_DRIVE_PROPERTIES"],
        drive_name
        )

    # Creating the image file
    process = file_cmd.create_new_image(
        file_name,
        properties["file_type"],
        properties["size"],
        )
    if not process["status"]:
        return response(error=True, message=process["msg"])

    # Creating the drive properties file
    full_file_name = f"{file_name}.{properties['file_type']}"
    prop_file_name = f"{full_file_name}.{PROPERTIES_SUFFIX}"
    process = file_cmd.write_drive_properties(prop_file_name, properties)
    process = ReturnCodeMapper.add_msg(process)
    if not process["status"]:
        return response(error=True, message=process["msg"])

    return response(message=
        _("Image file with properties created: %(file_name)s", file_name=full_file_name)
    )


@APP.route("/drive/cdrom", methods=["POST"])
@login_required
def drive_cdrom():
    """
    Creates a properties file for a CD-ROM image
    """
    drive_name = request.form.get("drive_name")
    file_name = Path(request.form.get("file_name")).name

    # Creating the drive properties file
    file_name = f"{file_name}.{PROPERTIES_SUFFIX}"
    properties = get_properties_by_drive_name(
        APP.config["RASCSI_DRIVE_PROPERTIES"],
        drive_name
        )
    process = file_cmd.write_drive_properties(file_name, properties)
    process = ReturnCodeMapper.add_msg(process)
    if process["status"]:
        return response(message=process["msg"])

    return response(error=True, message=process["msg"])


@APP.route("/config/save", methods=["POST"])
@login_required
def config_save():
    """
    Saves a config file to disk
    """
    file_name = Path(request.form.get("name") + f".{CONFIG_FILE_SUFFIX}").name

    process = file_cmd.write_config(file_name)
    process = ReturnCodeMapper.add_msg(process)
    if process["status"]:
        return response(message=process["msg"])

    return response(error=True, message=process["msg"])


@APP.route("/config/load", methods=["POST"])
@login_required
def config_load():
    """
    Loads a config file from disk
    """
    file_name = Path(request.form.get("name")).name

    if "load" in request.form:
        process = file_cmd.read_config(file_name)
        process = ReturnCodeMapper.add_msg(process)
        if process["status"]:
            return response(message=process["msg"])

        return response(error=True, message=process["msg"])

    if "delete" in request.form:
        file_path = Path(CFG_DIR) / file_name
        process = file_cmd.delete_file(file_path)
        process = ReturnCodeMapper.add_msg(process)
        if process["status"]:
            return response(message=process["msg"])

        return response(error=True, message=process["msg"])

    return response(error=True, message="Action field (load, delete) missing")


@APP.route("/files/diskinfo", methods=["POST"])
def show_diskinfo():
    """
    Displays disk image info
    """
    file_name = Path(request.form.get("file_name"))
    safe_path = is_safe_path(file_name)
    if not safe_path["status"]:
        return response(error=True, message=safe_path["msg"])
    server_info = ractl_cmd.get_server_info()
    returncode, diskinfo = sys_cmd.get_diskinfo(
            Path(server_info["image_dir"]) / file_name
        )
    if returncode == 0:
        return response(
            template="diskinfo.html",
            file_name=str(file_name),
            diskinfo=diskinfo,
            )

    return response(
        error=True,
        message=_("An error occurred when getting disk info: %(error)s", error=diskinfo)
    )


@APP.route("/sys/manpage", methods=["GET"])
def show_manpage():
    """
    Displays manpage
    """
    app_allowlist = ["rascsi", "rasctl", "rasdump", "scsimon"]

    app = request.args.get("app", type = str)

    if app not in app_allowlist:
        return response(
            error=True,
            message=_("%(app)s is not a recognized RaSCSI app", app=app)
        )

    file_path = f"{WEB_DIR}/../../../doc/{app}.1"
    html_to_strip = [
            "Content-type",
            "!DOCTYPE",
            "<HTML>",
            "<HEAD>",
            "<BODY>",
            "<H1>",
        ]

    returncode, manpage = sys_cmd.get_manpage(file_path)
    if returncode == 0:
        formatted_manpage = ""
        for line in manpage.splitlines(True):
            # Make URIs compatible with the Flask webapp
            if "/?1+" in line:
                line = line.replace("/?1+", "manpage?app=")
            # Strip out useless hyperlink
            elif "man2html" in line:
                line = line.replace("<A HREF=\"/\">man2html</A>", "man2html")
            if not any(ele in line for ele in html_to_strip):
                formatted_manpage += line

        return response(
            template="manpage.html",
            app=app,
            manpage=formatted_manpage,
            )

    return response(
        error=True,
        message=_("An error occurred when accessing man page: %(error)s", error=manpage)
    )


@APP.route("/logs/show", methods=["POST"])
def show_logs():
    """
    Displays system logs
    """
    lines = request.form.get("lines")
    scope = request.form.get("scope")

    returncode, logs = sys_cmd.get_logs(lines, scope)
    if returncode == 0:
        return response(
            template="logs.html",
            scope=scope,
            lines=lines,
            logs=logs,
            )

    return response(
        error=True,
        message=_("An error occurred when fetching logs: %(error)s", error=logs)
    )


@APP.route("/logs/level", methods=["POST"])
@login_required
def log_level():
    """
    Sets RaSCSI backend log level
    """
    level = request.form.get("level") or "info"

    process = ractl_cmd.set_log_level(level)
    if process["status"]:
        return response(message=_("Log level set to %(value)s", value=level))

    return response(error=True, message=process["msg"])


@APP.route("/scsi/attach_device", methods=["POST"])
@login_required
def attach_device():
    """
    Attaches a peripheral device that doesn't take an image file as argument
    """
    scsi_id = request.form.get("scsi_id")
    unit = request.form.get("unit")
    device_type = request.form.get("type")
    drive_name = request.form.get("drive_name")

    if not scsi_id:
        return response(error=True, message=_("No SCSI ID specified"))

    # Attempt to fetch the drive properties based on drive name
    drive_props = None
    if drive_name:
        for drive in APP.config["RASCSI_DRIVE_PROPERTIES"]:
            if drive["name"] == drive_name:
                drive_props = drive
                break

    # Collect device parameters into a dictionary
    PARAM_PREFIX = "param_"
    params = {}
    for item in request.form:
        if item.startswith(PARAM_PREFIX):
            param = request.form.get(item)
            if param:
                params.update({item.replace(PARAM_PREFIX, ""): param})

    if "interface" in params.keys():
        bridge_status = is_bridge_configured(params["interface"])
        if not bridge_status["status"]:
            return response(error=True, message=bridge_status["msg"])

    kwargs = {
            "unit": int(unit),
            "device_type": device_type,
            "params": params,
            }
    if drive_props:
        kwargs["vendor"] = drive_props["vendor"]
        kwargs["product"] = drive_props["product"]
        kwargs["revision"] = drive_props["revision"]
        kwargs["block_size"] = drive_props["block_size"]

    process = ractl_cmd.attach_device(scsi_id, **kwargs)
    process = ReturnCodeMapper.add_msg(process)
    if process["status"]:
        return response(message=_(
            "Attached %(device_type)s to SCSI ID %(id_number)s LUN %(unit_number)s",
            device_type=get_device_name(device_type),
            id_number=scsi_id,
            unit_number=unit,
            ))

    return response(error=True, message=process["msg"])


@APP.route("/scsi/attach", methods=["POST"])
@login_required
def attach_image():
    """
    Attaches a file image as a device
    """
    file_name = request.form.get("file_name")
    file_size = request.form.get("file_size")
    scsi_id = request.form.get("scsi_id")
    unit = request.form.get("unit")
    device_type = request.form.get("type")

    if not scsi_id:
        return response(error=True, message=_("No SCSI ID specified"))
    if not file_name:
        return response(error=True, message=_("No image file to insert"))

    kwargs = {"unit": int(unit), "params": {"file": file_name}}

    if device_type:
        kwargs["device_type"] = device_type
        device_types = ractl_cmd.get_device_types()
        expected_block_size = min(device_types["device_types"][device_type]["block_sizes"])

    # Attempt to load the device properties file:
    # same file name with PROPERTIES_SUFFIX appended
    drive_properties = Path(CFG_DIR) / f"{file_name}.{PROPERTIES_SUFFIX}"
    if drive_properties.is_file():
        process = file_cmd.read_drive_properties(drive_properties)
        process = ReturnCodeMapper.add_msg(process)
        if not process["status"]:
            return response(error=True, message=process["msg"])
        conf = process["conf"]
        kwargs["vendor"] = conf["vendor"]
        kwargs["product"] = conf["product"]
        kwargs["revision"] = conf["revision"]
        kwargs["block_size"] = conf["block_size"]
        expected_block_size = conf["block_size"]

    process = ractl_cmd.attach_device(scsi_id, **kwargs)
    process = ReturnCodeMapper.add_msg(process)
    if process["status"]:
        if int(file_size) % int(expected_block_size):
            logging.warning(
                "The image file size %s bytes is not a multiple of %s. "
                "RaSCSI will ignore the trailing data. "
                "The image may be corrupted, so proceed with caution.",
                file_size,
                expected_block_size,
                )
        return response(
            message=_(
                "Attached %(file_name)s as %(device_type)s to "
                "SCSI ID %(id_number)s LUN %(unit_number)s",
                file_name=file_name,
                device_type=get_device_name(device_type),
                id_number=scsi_id,
                unit_number=unit,
                )
            )

    return response(error=True, message=process["msg"])


@APP.route("/scsi/detach_all", methods=["POST"])
@login_required
def detach_all_devices():
    """
    Detaches all currently attached devices
    """
    process = ractl_cmd.detach_all()
    if process["status"]:
        return response(message=_("Detached all SCSI devices"))

    return response(error=True, message=process["msg"])


@APP.route("/scsi/detach", methods=["POST"])
@login_required
def detach():
    """
    Detaches a specified device
    """
    scsi_id = request.form.get("scsi_id")
    unit = request.form.get("unit")
    process = ractl_cmd.detach_by_id(scsi_id, unit)
    if process["status"]:
        return response(message=_("Detached SCSI ID %(id_number)s LUN %(unit_number)s",
                                  id_number=scsi_id, unit_number=unit))

    return response(error=True, message=process["msg"])


@APP.route("/scsi/eject", methods=["POST"])
@login_required
def eject():
    """
    Ejects a specified removable device image, but keeps the device attached
    """
    scsi_id = request.form.get("scsi_id")
    unit = request.form.get("unit")

    process = ractl_cmd.eject_by_id(scsi_id, unit)
    if process["status"]:
        return response(message=_("Ejected SCSI ID %(id_number)s LUN %(unit_number)s",
                                  id_number=scsi_id, unit_number=unit))

    return response(error=True, message=process["msg"])


@APP.route("/scsi/info", methods=["POST"])
def device_info():
    """
    Displays detailed info for all attached devices
    """
    process = ractl_cmd.list_devices()
    if process["status"]:
        return response(
            template="deviceinfo.html",
            devices=process["device_list"],
            )

    return response(error=True, message=_("No devices attached"))


@APP.route("/scsi/reserve", methods=["POST"])
@login_required
def reserve_id():
    """
    Reserves a SCSI ID and stores the memo for that reservation
    """
    scsi_id = request.form.get("scsi_id")
    memo = request.form.get("memo")
    reserved_ids = ractl_cmd.get_reserved_ids()["ids"]
    reserved_ids.extend(scsi_id)
    process = ractl_cmd.reserve_scsi_ids(reserved_ids)
    if process["status"]:
        RESERVATIONS[int(scsi_id)] = memo
        return response(message=_("Reserved SCSI ID %(id_number)s", id_number=scsi_id))

    return response(error=True, message=process["msg"])


@APP.route("/scsi/release", methods=["POST"])
@login_required
def release_id():
    """
    Releases the reservation of a SCSI ID as well as the memo for the reservation
    """
    scsi_id = request.form.get("scsi_id")
    reserved_ids = ractl_cmd.get_reserved_ids()["ids"]
    reserved_ids.remove(scsi_id)
    process = ractl_cmd.reserve_scsi_ids(reserved_ids)
    if process["status"]:
        RESERVATIONS[int(scsi_id)] = ""
        return response(message=_("Released the reservation for SCSI ID %(id_number)s", id_number=scsi_id))

    return response(error=True, message=process["msg"])


@APP.route("/pi/reboot", methods=["POST"])
@login_required
def restart():
    """
    Restarts the Pi
    """
    ractl_cmd.shutdown_pi("reboot")
    return response()


@APP.route("/pi/shutdown", methods=["POST"])
@login_required
def shutdown():
    """
    Shuts down the Pi
    """
    ractl_cmd.shutdown_pi("system")
    return response()


@APP.route("/files/download_to_iso", methods=["POST"])
@login_required
def download_to_iso():
    """
    Downloads a file and creates a CD-ROM image with the specified file system and the file
    """
    scsi_id = request.form.get("scsi_id")
    url = request.form.get("url")
    iso_type = request.form.get("type")

    if iso_type == "HFS":
        iso_args = ["-hfs"]
    elif iso_type == "ISO-9660 Level 1":
        iso_args = ["-iso-level", "1"]
    elif iso_type == "ISO-9660 Level 2":
        iso_args = ["-iso-level", "2"]
    elif iso_type == "ISO-9660 Level 3":
        iso_args = ["-iso-level", "3"]
    elif iso_type == "Joliet":
        iso_args = ["-J"]
    elif iso_type == "Rock Ridge":
        iso_args = ["-r"]
    else:
        return response(
            error=True,
            message=_("%(iso_type)s is not a valid CD-ROM format.", iso_type=iso_type)
        )

    process = file_cmd.download_file_to_iso(url, *iso_args)
    process = ReturnCodeMapper.add_msg(process)
    if not process["status"]:
        return response(
            error=True,
            message=_(
                "The following error occurred when creating the CD-ROM image: %(error)s",
                error=process["msg"],
            ),
        )

    process_attach = ractl_cmd.attach_device(
            scsi_id,
            device_type="SCCD",
            params={"file": process["file_name"]},
            )
    process_attach = ReturnCodeMapper.add_msg(process_attach)
    if process_attach["status"]:
        return response(
            message=_(
                "CD-ROM image %(file_name)s with type %(iso_type)s was created "
                "and attached to SCSI ID %(id_number)s",
                file_name=process["file_name"],
                iso_type=iso_type,
                id_number=scsi_id,
            ),
        )

    return response(
        error=True,
        message=_(
            "CD-ROM image %(file_name)s with type %(iso_type)s was created "
            "but could not be attached: %(error)s",
            file_name=process["file_name"],
            iso_type=iso_type,
            error=process_attach["msg"],
        ),
    )


@APP.route("/files/download_url", methods=["POST"])
@login_required
def download_file():
    """
    Downloads a remote file onto the images dir on the Pi
    """
    destination = request.form.get("destination")
    url = request.form.get("url")
    if destination == "afp":
        destination_dir = AFP_DIR
    else:
        server_info = ractl_cmd.get_server_info()
        destination_dir = server_info["image_dir"]
    process = file_cmd.download_to_dir(url, destination_dir, Path(url).name)
    process = ReturnCodeMapper.add_msg(process)
    if process["status"]:
        return response(message=process["msg"])

    return response(
        error=True,
        message=_(
            "The following error occurred when downloading: %(error)s",
            error=process["msg"],
        ),
    )


@APP.route("/files/upload", methods=["POST"])
def upload_file():
    """
    Uploads a file from the local computer to the images dir on the Pi
    Depending on the Dropzone.js JavaScript library
    """
    # Due to the embedded javascript library, we cannot use the @login_required decorator
    auth = auth_active(AUTH_GROUP)
    if auth["status"] and "username" not in session:
        return make_response(auth["msg"], 403)

    destination = request.form.get("destination")
    if destination == "afp":
        destination_dir = AFP_DIR
    else:
        server_info = ractl_cmd.get_server_info()
        destination_dir = server_info["image_dir"]
    return upload_with_dropzonejs(destination_dir)


@APP.route("/files/create", methods=["POST"])
@login_required
def create_file():
    """
    Creates an empty image file in the images dir
    """
    file_name = Path(request.form.get("file_name"))
    size = (int(request.form.get("size")) * 1024 * 1024)
    file_type = request.form.get("type")
    drive_name = request.form.get("drive_name")

    safe_path = is_safe_path(file_name)
    if not safe_path["status"]:
        return response(error=True, message=safe_path["msg"])
    full_file_name = f"{file_name}.{file_type}"
    process = file_cmd.create_new_image(str(file_name), file_type, size)
    if not process["status"]:
        return response(error=True, message=process["msg"])

    # Creating the drive properties file, if one is chosen
    if drive_name:
        properties = get_properties_by_drive_name(
            APP.config["RASCSI_DRIVE_PROPERTIES"],
            drive_name
            )
        prop_file_name = f"{full_file_name}.{PROPERTIES_SUFFIX}"
        process = file_cmd.write_drive_properties(prop_file_name, properties)
        process = ReturnCodeMapper.add_msg(process)
        if not process["status"]:
            return response(error=True, message=process["msg"])

        return response(
            status_code=201,
            message=_(
                "Image file with properties created: %(file_name)s",
                file_name=full_file_name,
            ),
            image=full_file_name,
        )

    return response(
        status_code=201,
        message=_("Image file created: %(file_name)s", file_name=full_file_name),
        image=full_file_name,
    )


@APP.route("/files/download", methods=["POST"])
@login_required
def download():
    """
    Downloads a file from the Pi to the local computer
    """
    file_name = Path(request.form.get("file"))
    safe_path = is_safe_path(file_name)
    if not safe_path["status"]:
        return response(error=True, message=safe_path["msg"])
    server_info = ractl_cmd.get_server_info()
    return send_from_directory(server_info["image_dir"], str(file_name), as_attachment=True)


@APP.route("/files/delete", methods=["POST"])
@login_required
def delete():
    """
    Deletes a specified file in the images dir
    """
    file_name = Path(request.form.get("file_name"))
    safe_path = is_safe_path(file_name)
    if not safe_path["status"]:
        return response(error=True, message=safe_path["msg"])
    process = file_cmd.delete_image(str(file_name))
    if not process["status"]:
        return response(error=True, message=process["msg"])

    # Delete the drive properties file, if it exists
    prop_file_path = Path(CFG_DIR) / f"{file_name}.{PROPERTIES_SUFFIX}"
    if prop_file_path.is_file():
        process = file_cmd.delete_file(prop_file_path)
        process = ReturnCodeMapper.add_msg(process)
        if process["status"]:
            return response(
                message=_(
                    "Image file with properties deleted: %(file_name)s",
                    file_name=str(file_name),
                ),
            )
        else:
            return response(error=True, message=process["msg"])

    return response(
        message=_(
            "Image file deleted: %(file_name)s",
            file_name=str(file_name),
        ),
    )


@APP.route("/files/rename", methods=["POST"])
@login_required
def rename():
    """
    Renames a specified file in the images dir
    """
    file_name = Path(request.form.get("file_name"))
    new_file_name = Path(request.form.get("new_file_name"))
    safe_path = is_safe_path(file_name)
    if not safe_path["status"]:
        return response(error=True, message=safe_path["msg"])
    safe_path = is_safe_path(new_file_name)
    if not safe_path["status"]:
        return response(error=True, message=safe_path["msg"])
    process = file_cmd.rename_image(str(file_name), str(new_file_name))
    if not process["status"]:
        return response(error=True, message=process["msg"])

    # Rename the drive properties file, if it exists
    prop_file_path = Path(CFG_DIR) / f"{file_name}.{PROPERTIES_SUFFIX}"
    new_prop_file_path = Path(CFG_DIR) / f"{new_file_name}.{PROPERTIES_SUFFIX}"
    if prop_file_path.is_file():
        process = file_cmd.rename_file(prop_file_path, new_prop_file_path)
        process = ReturnCodeMapper.add_msg(process)
        if process["status"]:
            return response(
                message=_(
                    "Image file with properties renamed to: %(file_name)s",
                    file_name=str(new_file_name),
                ),
            )
        else:
            return response(error=True, message=process["msg"])

    return response(
        message=_(
            "Image file renamed to: %(file_name)s",
            file_name=str(new_file_name),
        ),
    )


@APP.route("/files/copy", methods=["POST"])
@login_required
def copy():
    """
    Creates a copy of a specified file in the images dir
    """
    file_name = Path(request.form.get("file_name"))
    new_file_name = Path(request.form.get("copy_file_name"))
    safe_path = is_safe_path(file_name)
    if not safe_path["status"]:
        return response(error=True, message=safe_path["msg"])
    safe_path = is_safe_path(new_file_name)
    if not safe_path["status"]:
        return response(error=True, message=safe_path["msg"])
    process = file_cmd.copy_image(str(file_name), str(new_file_name))
    if not process["status"]:
        return response(error=True, message=process["msg"])

    # Create a copy of the drive properties file, if it exists
    prop_file_path = Path(CFG_DIR) / f"{file_name}.{PROPERTIES_SUFFIX}"
    new_prop_file_path = Path(CFG_DIR) / f"{new_file_name}.{PROPERTIES_SUFFIX}"
    if prop_file_path.is_file():
        process = file_cmd.copy_file(prop_file_path, new_prop_file_path)
        process = ReturnCodeMapper.add_msg(process)
        if process["status"]:
            return response(
                message=_(
                    "Copy of image file with properties saved as: %(file_name)s",
                    file_name=str(new_file_name),
                ),
            )
        else:
            return response(error=True, message=process["msg"])

    return response(
        message=_(
            "Copy of image file saved as: %(file_name)s",
            file_name=str(new_file_name),
        ),
    )


@APP.route("/files/extract_image", methods=["POST"])
@login_required
def extract_image():
    """
    Extracts all or a subset of files in the specified archive
    """
    archive_file = Path(request.form.get("archive_file"))
    archive_members_raw = request.form.get("archive_members") or None
    archive_members = archive_members_raw.split("|") if archive_members_raw else None
    safe_path = is_safe_path(archive_file)
    if not safe_path["status"]:
        return response(error=True, message=safe_path["msg"])
    extract_result = file_cmd.extract_image(
        str(archive_file),
        archive_members
        )

    if extract_result["return_code"] == ReturnCodes.EXTRACTIMAGE_SUCCESS:

        for properties_file in extract_result["properties_files_moved"]:
            if properties_file["status"]:
                logging.info(
                        "Properties file %s moved to %s",
                        properties_file["name"],
                        CFG_DIR,
                        )
            else:
                logging.warning(
                        "Failed to move properties file %s to %s",
                        properties_file["name"],
                        CFG_DIR,
                        )

        return response(message=ReturnCodeMapper.add_msg(extract_result).get("msg"))

    return response(error=True, message=ReturnCodeMapper.add_msg(extract_result).get("msg"))


@APP.route("/language", methods=["POST"])
def change_language():
    """
    Changes the session language locale and refreshes the Flask app context
    """
    locale = request.form.get("locale")
    session["language"] = locale
    ractl_cmd.locale = session["language"]
    file_cmd.locale = session["language"]
    refresh()

    language = Locale.parse(locale)
    language_name = language.get_language_name(locale)
    return response(message=_("Changed Web Interface language to %(locale)s", locale=language_name))


@APP.before_first_request
def detect_locale():
    """
    Get the detected locale to use for UI string translations.
    This requires the Flask app to have started first.
    """
    session["language"] = get_locale()
    ractl_cmd.locale = session["language"]
    file_cmd.locale = session["language"]


if __name__ == "__main__":
    APP.secret_key = "rascsi_is_awesome_insecure_secret_key"
    APP.config["SESSION_TYPE"] = "filesystem"
    APP.config["MAX_CONTENT_LENGTH"] = int(MAX_FILE_SIZE)

    parser = argparse.ArgumentParser(description="RaSCSI Web Interface command line arguments")
    parser.add_argument(
        "--port",
        type=int,
        default=8080,
        action="store",
        help="Port number the web server will run on",
        )
    parser.add_argument(
        "--password",
        type=str,
        default="",
        action="store",
        help="Token password string for authenticating with RaSCSI",
        )
    parser.add_argument(
        "--rascsi-host",
        type=str,
        default="localhost",
        action="store",
        help="RaSCSI host. Default: localhost",
        )
    parser.add_argument(
        "--rascsi-port",
        type=int,
        default=6868,
        action="store",
        help="RaSCSI port. Default: 6868",
        )
    parser.add_argument(
        "--log-level",
        type=str,
        default="warning",
        action="store",
        help="Log level for Web UI. Default: warning",
        choices=["debug", "info", "warning", "error", "critical"],
        )
    parser.add_argument(
        "--dev-mode",
        action="store_true",
        help="Run in development mode"
        )

    arguments = parser.parse_args()
    APP.config["RASCSI_TOKEN"] = arguments.password

    sock_cmd = SocketCmdsFlask(host=arguments.rascsi_host, port=arguments.rascsi_port)
    ractl_cmd = RaCtlCmds(sock_cmd=sock_cmd, token=APP.config["RASCSI_TOKEN"])
    file_cmd = FileCmds(sock_cmd=sock_cmd, ractl=ractl_cmd, token=APP.config["RASCSI_TOKEN"])
    sys_cmd = SysCmds()

    if Path(f"{CFG_DIR}/{DEFAULT_CONFIG}").is_file():
        file_cmd.read_config(DEFAULT_CONFIG)
    if Path(f"{DRIVE_PROPERTIES_FILE}").is_file():
        process = file_cmd.read_drive_properties(DRIVE_PROPERTIES_FILE)
        if process["status"]:
            APP.config["RASCSI_DRIVE_PROPERTIES"] = process["conf"]
        else:
            APP.config["RASCSI_DRIVE_PROPERTIES"] = []
            logging.error(process["msg"])
    else:
        APP.config["RASCSI_DRIVE_PROPERTIES"] = []
        logging.warning("Could not read drive properties from %s", DRIVE_PROPERTIES_FILE)

    logging.basicConfig(stream=sys.stdout,
                        format="%(asctime)s %(levelname)s %(filename)s:%(lineno)s %(message)s",
                        level=arguments.log_level.upper())

    if arguments.dev_mode:
        print("Running rascsi-web in development mode ...")
        APP.debug = True
        from werkzeug.debug import DebuggedApplication
        try:
            bjoern.run(DebuggedApplication(APP, evalex=False), "0.0.0.0", arguments.port)
        except KeyboardInterrupt:
            pass
    else:
        print("Serving rascsi-web...")
        bjoern.run(APP, "0.0.0.0", arguments.port)
