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

###################
#    This file change the code for python3.8 compatibility
#    from the command line and display the result in a web interface.
#    Copyright (C) 2021, 2022  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 run scripts and display the result in a Web Interface.

This file change the code for python3.8 compatibility.

To install WebScripts with python3.8 compatibility 
as package run the following commands line:
    - python3.8 to_3.8.py
    - python3.8 ../../../setup38.py install

The new package is named WebScripts38.

Impact: "log_encoding" configuration is not use.
"""

__version__ = "0.0.3"
__author__ = "Maurice Lambert"
__author_email__ = "mauricelambert434@gmail.com"
__maintainer__ = "Maurice Lambert"
__maintainer_email__ = "mauricelambert434@gmail.com"
__description__ = """
This tool run scripts and display the result in a Web Interface.

This file change the code for python3.8 compatibility.
"""
__license__ = "GPL-3.0 License"
__url__ = "https://github.com/mauricelambert/WebScripts"

copyright = """
WebScripts  Copyright (C) 2021  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__ = []

from shutil import copytree, copyfile
from os import path
import logging
import glob
import sys
import re


def copy(directory: str, setup_filename: str) -> None:

    """
    This function copy the WebScripts directory and the setup.
    """

    logging.warning("Copy the WebScripts directory and the setup filename...")
    copytree(path.join(directory, "WebScripts"), path.join(directory, "WebScripts38"))
    copyfile(path.join(directory, "setup.py"), setup_filename)
    logging.info("Copy the WebScripts directory and the setup filename...")


def change_setup(filename: str) -> None:

    """
    This function change the setup.py file.
    """

    content = open(filename).read()
    logging.warning("Change the new setup content...")

    with open(filename, "w") as file:
        file.write(
            content.replace(
                "import WebScripts as package", "import WebScripts38 as package"
            ).replace('python_requires=">=3.9",', 'python_requires=">=3.8",')
        )

    logging.info("New setup is changed.")


def change_manifest(filename: str) -> None:

    """
    This function change the manifest.in file.
    """

    content = open(filename).read()
    logging.warning("Change the new manifest content...")

    with open(filename, "w") as file:
        file.write(content.replace("WebScripts/", "WebScripts38/"))

    logging.info("New manifest is changed.")


def change_utils(filename: str):

    """
    This function change the utils.py file.
    """

    logging.warning("Change the new utils.py content...")
    content = open(filename).read()

    with open(filename, "w") as file:
        file.write(
            content.replace(
                "from typing import TypeVar, List, Dict, _SpecialGenericAlias, _GenericAlias",
                "from typing import TypeVar, List, Dict, _GenericAlias",
            ).replace(
                """ or isinstance(
                type_, _SpecialGenericAlias
            )""",
                "",
            )
        )

    logging.info("New utils.py is changed.")


def change_WebScripts(filename: str):

    """
    This function change the WebScripts.py file.
    """

    logging.warning("Change the new WebScripts.py content...")
    content = open(filename).read()

    with open(filename, "w") as file:
        file.write(
            content.replace('encoding="utf-8",', "").replace(
                '"log_encoding": "encoding",', ""
            )
        )

    logging.info("New WebScripts.py is changed.")


def change_subscriptable_iterator(directory: str) -> None:

    """
    This function change subscriptable Iterators.
    """

    regex = re.compile(r"Iterator\[[\w,\s\[\]]+\]")
    for filename in glob.glob(
        path.join(directory, "WebScripts38", "**", "*.py"), recursive=True
    ):
        content = open(filename).read()
        logging.warning(f"Change the new {filename} content...")

        new_content, number = regex.subn("Iterator", content)

        with open(filename, "w") as file:
            file.write(new_content)

        logging.info(f"New {filename} is changed ({number} times).")

    for filename in glob.glob(
        path.join(directory, "WebScripts38", "*.py"), recursive=True
    ):
        content = open(filename).read()
        logging.warning(f"Change the new {filename} content...")

        new_content, number = regex.subn("Iterator", content)

        with open(filename, "w") as file:
            file.write(new_content)

        logging.info(f"New {filename} is changed ({number} times).")

def main():

    """
    This function execute the file.
    """

    logging.debug("Set the WebScripts directory and the setup filename...")
    webscript_dir = path.join(path.dirname(__file__), "..", "..", "..")
    new_setup = path.join(webscript_dir, "setup38.py")

    copy(webscript_dir, new_setup)
    change_manifest(path.join(webscript_dir, "MANIFEST.in"))
    change_setup(new_setup)
    change_utils(path.join(webscript_dir, "WebScripts38", "utils.py"))
    change_WebScripts(path.join(webscript_dir, "WebScripts38", "WebScripts.py"))
    change_subscriptable_iterator(webscript_dir)


if __name__ == "__main__":
    logging.basicConfig(level=0)
    main()
    sys.exit(0)
