import re
from typing import Optional, TypedDict

from discord import Interaction, Guild, Message, TextChannel
from discord.app_commands import Group
from discord.ext.commands import Cog

from config import CONFIG
from rocketbot.bot import Rocketbot
from rocketbot.cogs.basecog import BaseCog
from rocketbot.cogsetting import CogSetting
from rocketbot.ui.pagedcontent import PAGE_BREAK, update_paged_content, paginate
from rocketbot.utils import MOD_PERMISSIONS, blockquote_markdown, indent_markdown

_CURRENT_DATA_VERSION = 1

class BangCommand(TypedDict):
    content: str
    mod_only: bool
    version: int

class BangCommandCog(BaseCog, name='Bang Commands'):
    SETTING_COMMANDS = CogSetting(
        name='commands',
        datatype=dict[str, BangCommand],
        default_value={},
    )

    def __init__(self, bot: Rocketbot):
        super().__init__(
            bot,
            config_prefix='bangcommand',
            short_description='Provides custom informational chat !commands.',
            long_description='Bang commands are simple one-word messages starting with an exclamation '
                             '(bang) that will make the bot respond with simple informational replies. '
                             'Useful for posting answers to frequently asked questions, reminding users '
                             'of rules, and similar.'
        )

    def _get_commands(self, guild: Guild) -> dict[str, BangCommand]:
        return self.get_guild_setting(guild, BangCommandCog.SETTING_COMMANDS)

    def _set_commands(self, guild: Guild, commands: dict[str, BangCommand]) -> None:
        self.set_guild_setting(guild, BangCommandCog.SETTING_COMMANDS, commands)

    bang = Group(
        name='bangcommand',
        description='Provides custom informational chat !commands.',
        guild_only=True,
        default_permissions=MOD_PERMISSIONS,
    )

    @bang.command()
    async def define(self, interaction: Interaction, name: str, definition: str, mod_only: bool = False) -> None:
        """
        Defines or redefines a bang command.

        Parameters
        ----------
        interaction: Interaction
        name: string
            name of the command (lowercase a-z, underscores, and hyphens)
        definition: string
            content of the command
        mod_only: bool
            whether the command will only be recognized when a mod uses it
        """
        if not BangCommandCog._is_valid_name(name):
            self.log(interaction.guild, f'{interaction.user.name} used command /bangcommand define {name} {definition}')
            await interaction.response.send_message(
                f'{CONFIG["failure_emoji"]} Invalid command name. Names must consist of lowercase letters, underscores, and hyphens (no spaces).',
                ephemeral=True,
            )
            return
        name = BangCommandCog._normalize_name(name)
        cmds = self._get_commands(interaction.guild)
        cmds[name] = {
            'content': definition,
            'mod_only': mod_only,
            'version': _CURRENT_DATA_VERSION,
        }
        self._set_commands(interaction.guild, cmds)
        await interaction.response.send_message(
            f'{CONFIG["success_emoji"]} Command `!{name}` has been defined.\n\n{blockquote_markdown(definition)}',
            ephemeral=True,
        )

    @bang.command()
    async def undefine(self, interaction: Interaction, name: str) -> None:
        """
        Removes a bang command.

        Parameters
        ----------
        interaction: Interaction
        name: string
            name of the previously defined command
        """
        name = BangCommandCog._normalize_name(name)
        cmds = self._get_commands(interaction.guild)
        if name not in cmds:
            await interaction.response.send_message(
                f'{CONFIG["failure_emoji"]} Command `!{name}` does not exist.',
                ephemeral=True,
            )
            return
        del cmds[name]
        self._set_commands(interaction.guild, cmds)
        await interaction.response.send_message(
            f'{CONFIG["success_emoji"]} Command `!{name}` removed.',
            ephemeral=True,
        )

    @bang.command()
    async def list(self, interaction: Interaction) -> None:
        """
        Lists all defined bang commands.

        Parameters
        ----------
        interaction: Interaction
        """
        cmds = self._get_commands(interaction.guild)
        if cmds is None or len(cmds) == 0:
            await interaction.response.send_message(
                f'{CONFIG["info_emoji"]} No commands defined.',
                ephemeral=True,
            )
            return
        text = '## Commands'
        for name, cmd in sorted(cmds.items()):
            text += PAGE_BREAK + f'\n- `!{name}`'
            if cmd['mod_only']:
                text += ' - **mod only**'
            text += f'\n{indent_markdown(cmd["content"])}'
        pages = paginate(text)
        await update_paged_content(interaction, None, 0, pages)

    @Cog.listener()
    async def on_message(self, message: Message) -> None:
        if message.guild is None or message.channel is None or not isinstance(message.channel, TextChannel):
            return
        content = message.content
        if content is None or not content.startswith('!') or not BangCommandCog._is_valid_name(content):
            return
        name = BangCommandCog._normalize_name(content)
        cmds = self._get_commands(message.guild)
        cmd = cmds.get(name, None)
        if cmd is None:
            return
        if cmd['mod_only'] and not message.author.guild_permissions.ban_members:
            return
        text = cmd["content"]
        # text = f'{text}\n\n-# {message.author.name} used `!{name}`'
        await message.channel.send(
            text,
        )

    @staticmethod
    def _normalize_name(name: str) -> str:
        name = name.lower().strip()
        if name.startswith('!'):
            name = name[1:]
        return name

    @staticmethod
    def _is_valid_name(name: Optional[str]) -> bool:
        if name is None:
            return False
        return re.match(r'^!?([a-z]+)([_-][a-z]+)*$', name) is not None