# SPDX-License-Identifier: MIT

import argparse
import importlib.metadata
import platform
import sys
from pathlib import Path
from typing import Union

import aiohttp

import disnake


def show_version() -> None:
    entries = []

    sys_ver = sys.version_info
    entries.append(
        f"- Python v{sys_ver.major}.{sys_ver.minor}.{sys_ver.micro}-{sys_ver.releaselevel}"
    )
    disnake_ver = disnake.version_info
    entries.append(
        f"- disnake v{disnake_ver.major}.{disnake_ver.minor}.{disnake_ver.micro}-{disnake_ver.releaselevel}"
    )
    try:
        version = importlib.metadata.version("disnake")
    except importlib.metadata.PackageNotFoundError:
        pass
    else:
        entries.append(f"    - disnake importlib.metadata: v{version}")

    entries.append(f"- aiohttp v{aiohttp.__version__}")
    uname = platform.uname()
    entries.append(f"- system info: {uname.system} {uname.release} {uname.version} {uname.machine}")
    print("\n".join(entries))


def core(parser: argparse.ArgumentParser, args) -> None:
    # this method runs when no subcommands are provided
    # as such, we can assume that we want to print help
    if args.version:
        show_version()
    else:
        parser.print_help()


_interaction_bot_init = """super().__init__(**kwargs)"""
_commands_bot_init = (
    'super().__init__(command_prefix=commands.when_mentioned_or("{prefix}"), **kwargs)'
)
_bot_template = """#!/usr/bin/env python3

from disnake.ext import commands
import disnake
import config


class Bot(commands.{base}):
    def __init__(self, **kwargs):
        {init}
        for cog in config.cogs:
            try:
                self.load_extension(cog)
            except Exception as exc:
                print(f"Could not load extension {{cog}} due to {{exc.__class__.__name__}}: {{exc}}")

    async def on_ready(self):
        print(f"Logged on as {{self.user}} (ID: {{self.user.id}})")


bot = Bot()

# write general commands here

if __name__ == "__main__":
    bot.run(config.token)
"""

_gitignore_template = """# Byte-compiled / optimized / DLL files
__pycache__/
*.py[cod]
*$py.class

# C extensions
*.so

# Distribution / packaging
.Python
env/
build/
develop-eggs/
dist/
downloads/
eggs/
.eggs/
lib/
lib64/
parts/
sdist/
var/
*.egg-info/
.installed.cfg
*.egg

# Our configuration files
config.py
"""

_cog_template = '''from disnake.ext import commands
import disnake

class {name}(commands.Cog{attrs}):
    """The description for {name} goes here."""

    def __init__(self, bot):
        self.bot = bot
{extra}
def setup(bot):
    bot.add_cog({name}(bot))
'''

_cog_extras = """
    def cog_unload(self):
        # clean up logic goes here
        pass

    async def cog_check(self, ctx):
        # checks that apply to every command in here
        return True

    async def bot_check(self, ctx):
        # checks that apply to every command to the bot
        return True

    async def bot_check_once(self, ctx):
        # check that apply to every command but is guaranteed to be called only once
        return True

    async def cog_command_error(self, ctx, error):
        # error handling to every command in here
        pass

    async def cog_before_invoke(self, ctx):
        # called before a command is called here
        pass

    async def cog_after_invoke(self, ctx):
        # called after a command is called here
        pass

"""


# certain file names and directory names are forbidden
# see: https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247%28v=vs.85%29.aspx
# although some of this doesn't apply to Linux, we might as well be consistent
_ascii_table = dict.fromkeys('<>:"|?*', "-")

# NUL (0) and 1-31 are disallowed
_byte_table = dict.fromkeys(map(chr, range(32)))
_base_table = {**_ascii_table, **_byte_table}

_translation_table = str.maketrans(_base_table)


def to_path(parser, name: Union[str, Path], *, replace_spaces: bool = False):
    if isinstance(name, Path):
        return name

    if sys.platform == "win32":
        forbidden = (
            "CON",
            "PRN",
            "AUX",
            "NUL",
            "COM1",
            "COM2",
            "COM3",
            "COM4",
            "COM5",
            "COM6",
            "COM7",
            "COM8",
            "COM9",
            "LPT1",
            "LPT2",
            "LPT3",
            "LPT4",
            "LPT5",
            "LPT6",
            "LPT7",
            "LPT8",
            "LPT9",
        )
        if len(name) <= 4 and name.upper() in forbidden:
            parser.error("invalid directory name given, use a different one")

    name = name.translate(_translation_table)
    if replace_spaces:
        name = name.replace(" ", "-")
    return Path(name)


def newbot(parser, args) -> None:
    new_directory = to_path(parser, args.directory) / to_path(parser, args.name)

    # as a note exist_ok for Path is a 3.5+ only feature
    # since we already checked above that we're >3.5
    try:
        new_directory.mkdir(exist_ok=True, parents=True)
    except OSError as exc:
        parser.error(f"could not create our bot directory ({exc})")

    cogs = new_directory / "cogs"

    try:
        cogs.mkdir(exist_ok=True)
        init = cogs / "__init__.py"
        init.touch()
    except OSError as exc:
        print(f"warning: could not create cogs directory ({exc})")

    try:
        with open(str(new_directory / "config.py"), "w", encoding="utf-8") as fp:
            fp.write('token = "place your token here"\ncogs = []\n')
    except OSError as exc:
        parser.error(f"could not create config file ({exc})")

    try:
        with open(str(new_directory / "bot.py"), "w", encoding="utf-8") as fp:
            if args.interaction_client:
                init = _interaction_bot_init
                base = "AutoShardedInteractionBot" if args.sharded else "InteractionBot"
            else:
                init = _commands_bot_init.format(prefix=args.prefix)
                base = "AutoShardedBot" if args.sharded else "Bot"
            fp.write(_bot_template.format(base=base, init=init))
    except OSError as exc:
        parser.error(f"could not create bot file ({exc})")

    if not args.no_git:
        try:
            with open(str(new_directory / ".gitignore"), "w", encoding="utf-8") as fp:
                fp.write(_gitignore_template)
        except OSError as exc:
            print(f"warning: could not create .gitignore file ({exc})")

    print("successfully made bot at", new_directory)


def newcog(parser, args) -> None:
    cog_dir = to_path(parser, args.directory)
    try:
        cog_dir.mkdir(exist_ok=True)
    except OSError as exc:
        print(f"warning: could not create cogs directory ({exc})")

    directory = cog_dir / to_path(parser, args.name)
    directory = directory.with_suffix(".py")
    try:
        with open(str(directory), "w", encoding="utf-8") as fp:
            attrs = ""
            extra = _cog_extras if args.full else ""
            if args.class_name:
                name = args.class_name
            else:
                name = str(directory.stem)
                if "-" in name or "_" in name:
                    translation = str.maketrans("-_", "  ")
                    name = name.translate(translation).title().replace(" ", "")
                else:
                    name = name.title()

            if args.display_name:
                attrs += f', name="{args.display_name}"'
            if args.hide_commands:
                attrs += ", command_attrs=dict(hidden=True)"
            fp.write(_cog_template.format(name=name, extra=extra, attrs=attrs))
    except OSError as exc:
        parser.error(f"could not create cog file ({exc})")
    else:
        print("successfully made cog at", directory)


def add_newbot_args(subparser) -> None:
    parser = subparser.add_parser("newbot", help="creates a command bot project quickly")
    parser.set_defaults(func=newbot)

    parser.add_argument("name", help="the bot project name")
    parser.add_argument(
        "directory", help="the directory to place it in (default: .)", nargs="?", default=Path.cwd()
    )

    group = parser.add_mutually_exclusive_group()
    group.add_argument(
        "--prefix", help="the bot prefix (default: $)", default="$", metavar="<prefix>"
    )
    group.add_argument(
        "--app-commands-only",
        help="whether to only process application commands",
        action="store_true",
        dest="interaction_client",
    )
    parser.add_argument(
        "--sharded", help="whether to use an automatically sharded bot", action="store_true"
    )
    parser.add_argument(
        "--no-git", help="do not create a .gitignore file", action="store_true", dest="no_git"
    )


def add_newcog_args(subparser) -> None:
    parser = subparser.add_parser("newcog", help="creates a new cog template quickly")
    parser.set_defaults(func=newcog)

    parser.add_argument("name", help="the cog name")
    parser.add_argument(
        "directory",
        help="the directory to place it in (default: cogs)",
        nargs="?",
        default=Path("cogs"),
    )
    parser.add_argument(
        "--class-name", help="the class name of the cog (default: <name>)", dest="class_name"
    )
    parser.add_argument("--display-name", help="the cog name (default: <name>)")
    parser.add_argument(
        "--hide-commands", help="whether to hide all commands in the cog", action="store_true"
    )
    parser.add_argument("--full", help="add all special methods as well", action="store_true")


def parse_args():
    parser = argparse.ArgumentParser(prog="disnake", description="Tools for helping with disnake")
    parser.add_argument("-v", "--version", action="store_true", help="shows the library version")
    parser.set_defaults(func=core)

    subparser = parser.add_subparsers(dest="subcommand", title="subcommands")
    add_newbot_args(subparser)
    add_newcog_args(subparser)
    return parser, parser.parse_args()


def main() -> None:
    parser, args = parse_args()
    args.func(parser, args)


if __name__ == "__main__":
    main()