"""
The MIT License (MIT)

Copyright (c) 2015-present Rapptz

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
"""

from __future__ import annotations

from typing import Optional, Tuple, Dict

import argparse
import sys
from pathlib import Path, PurePath, PureWindowsPath

import discord
import importlib.metadata
import aiohttp
import platform


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

    entries.append('- Python v{0.major}.{0.minor}.{0.micro}-{0.releaselevel}'.format(sys.version_info))
    version_info = discord.version_info
    entries.append('- discord.py v{0.major}.{0.minor}.{0.micro}-{0.releaselevel}'.format(version_info))
    if version_info.releaselevel != 'final':
        version = importlib.metadata.version('discord.py')
        if version:
            entries.append(f'    - discord.py metadata: v{version}')

    entries.append(f'- aiohttp v{aiohttp.__version__}')
    uname = platform.uname()
    entries.append('- system info: {0.system} {0.release} {0.version}'.format(uname))
    print('\n'.join(entries))


def core(parser: argparse.ArgumentParser, args: argparse.Namespace) -> None:
    if args.version:
        show_version()
    else:
        parser.print_help()


_bot_template = """#!/usr/bin/env python3

from discord.ext import commands
import discord
import config

class Bot(commands.{base}):
    def __init__(self, intents: discord.Intents, **kwargs):
        super().__init__(command_prefix=commands.when_mentioned_or('{prefix}'), intents=intents, **kwargs)

    async def setup_hook(self):
        for cog in config.cogs:
            try:
                await 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}})')


intents = discord.Intents.default()
intents.message_content = True
bot = Bot(intents=intents)

# write general commands here

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 discord.ext import commands
import discord

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

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

_cog_extras = '''
    async def cog_load(self):
        # loading logic goes here
        pass

    async 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_app_command_error(self, interaction, error):
        # error handling to every application 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
_base_table: Dict[str, Optional[str]] = {
    '<': '-',
    '>': '-',
    ':': '-',
    '"': '-',
    # '/': '-', these are fine
    # '\\': '-',
    '|': '-',
    '?': '-',
    '*': '-',
}

# NUL (0) and 1-31 are disallowed
_base_table.update((chr(i), None) for i in range(32))

_translation_table = str.maketrans(_base_table)


def to_path(parser: argparse.ArgumentParser, name: str, *, replace_spaces: bool = False) -> Path:
    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')
    path = PurePath(name)
    if isinstance(path, PureWindowsPath) and path.drive:
        drive, rest = path.parts[0], path.parts[1:]
        transformed = tuple(map(lambda p: p.translate(_translation_table), rest))
        name = drive + '\\'.join(transformed)

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


def newbot(parser: argparse.ArgumentParser, args: argparse.Namespace) -> 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:
            base = 'Bot' if not args.sharded else 'AutoShardedBot'
            fp.write(_bot_template.format(base=base, prefix=args.prefix))
    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: argparse.ArgumentParser, args: argparse.Namespace) -> 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: argparse._SubParsersAction[argparse.ArgumentParser]) -> 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())
    parser.add_argument('--prefix', help='the bot prefix (default: $)', default='$', metavar='<prefix>')
    parser.add_argument('--sharded', help='whether to use AutoShardedBot', 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: argparse._SubParsersAction[argparse.ArgumentParser]) -> 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() -> Tuple[argparse.ArgumentParser, argparse.Namespace]:
    parser = argparse.ArgumentParser(prog='discord', description='Tools for helping with discord.py')
    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()