#!/usr/bin/env python3
# -*- coding: utf-8 -*-

###################
#    This tool runs CLI scripts and displays output in a Web Interface.
#    Copyright (C) 2021, 2022, 2023  Maurice Lambert

#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.

#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.

#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <https://www.gnu.org/licenses/>.
###################

"""
This tool runs CLI scripts and displays output in a Web Interface.

This module adds notifications on WebScripts pages.
"""

__version__ = "0.0.1"
__author__ = "Maurice Lambert"
__author_email__ = "mauricelambert434@gmail.com"
__maintainer__ = "Maurice Lambert"
__maintainer_email__ = "mauricelambert434@gmail.com"
__description__ = """
This tool runs CLI scripts and displays output in a Web Interface.

This module adds notifications on WebScripts pages.
"""
__license__ = "GPL-3.0 License"
__url__ = "https://github.com/mauricelambert/WebScripts"

copyright = """
WebScripts  Copyright (C) 2021, 2022, 2023  Maurice Lambert
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions.
"""
license = __license__
__copyright__ = copyright

__all__ = ["add"]

from typing import TypeVar, List, Tuple, Dict
from urllib.parse import parse_qs
from types import MethodType
from html import escape
from os import _Environ
from sys import modules

Server = TypeVar("Server")
User = TypeVar("User")

notification_id: int = 0

module_getter: MethodType = modules.get
check_right = module_getter(
    "WebScripts.Pages"
    if module_getter("WebScripts")
    else "WebScripts38.Pages",
    module_getter("Pages"),
).check_right
commons = module_getter("commons") or modules["WebScripts.commons"]
TokenCSRF = commons.TokenCSRF


def add(
    environ: _Environ,
    user: User,
    server: Server,
    filename: str,
    arguments: bytes,
    inputs: List[str],
    csrf_token: str = None,
) -> Tuple[str, Dict[str, str], str]:
    """
    This function adds a new notification
    in WebScripts pages.
    """

    global notification_id
    script = server.pages.scripts.get("change_user_password.py")
    permissions = getattr(server.configuration, "admin_groups", None)

    if script and not check_right(user, script):
        return "403", {}, b""
    elif permissions and not any(g in permissions for g in user["groups"]):
        return "403", {}, b""

    if arguments:
        form = parse_qs(arguments.decode())
        environ_getter = environ.get
        text = form.get("text")
        if text and TokenCSRF.check_csrf(
            user,
            form.get("csrf", [None])[0],
            getattr(server.configuration, "csrf_max_time", 300),
            environ_getter("HTTP_REFERER"),
            server.get_baseurl(environ_getter, environ),
        ):
            server.CommonsClasses.CallableFile.template_header += f"""
                <div id="notification{notification_id}" class="notification">
                    <button class="notification_close">
                        &#9932; Close
                    </button>
                    <p>
                        <span class="notification_user">{escape(user.name)}:\
 </span>
                        {escape(text[0])}
                    </p>
                </div>
            """
            notification_id += 1
    else:
        return (
            "200 OK",
            {
                "Content-Security-Policy": server.headers[
                    "Content-Security-Policy"
                ].replace("form-action 'none';", "form-action 'self';")
            },
            f"""
            <html>
                <head>
                </head>
                <body>
                    <form action="" method="POST">
                        <textarea name="text"></textarea>
                        <input type="hidden" name="csrf"\
 value="{TokenCSRF.build_token(user)}">
                        <input type="submit">
                    </form>
                </body>
            </html>
        """,
        )

    return (
        "200 OK",
        {"Content-Type": "text/plain"},
        "OK: notification is added.",
    )
