# -*- coding: utf-8 -*-
"""
======================================================
:mod:`irc3.plugins.asynchronous` Asynchronous Events
======================================================

Provides asynchronous handling for various IRC events including WHOIS, WHO queries, 
and channel management through non-blocking operations.

Features:
- **WHOIS Support**: Retrieve detailed user information from the server.
- **WHO Queries**: Fetch channel users with their respective flags.
- **CTCP Handling**: Manage custom Client-to-Client Protocol requests.
- **Channel Topic Management**: Get or modify channel topics efficiently.
- **Ban List Handling**: Query active bans on a channel.

Usage
=====
Subclass `~irc3.asynchronous.AsyncEvents` to create custom asynchronous event handlers.

Example:
    class MyPlugin:
        def __init__(self, bot):
            self.bot = bot
            self.whois = Whois(bot)

        async def do_whois(self):
            whois = await self.whois(nick='gawel')
            if int(whois['idle']) / 60 > 10:
                self.bot.privmsg('gawel', 'Wake up dude')

.. warning::
    Always verify `result['timeout']` to ensure a response was received before the timeout.
"""

from irc3.asynchronous import AsyncEvents
from irc3 import utils
from irc3 import dec


class Whois(AsyncEvents):
    """Asynchronously handle WHOIS responses to gather user details.

    Attributes:
        timeout (int): Default timeout for WHOIS response in seconds.
        send_line (str): IRC command template for WHOIS requests.
    """

    timeout = 20
    send_line = 'WHOIS {nick} {nick}'

    events = (
        {'match': r"(?i)^:\S+ 301 \S+ {nick} :(?P<away>.*)"},
        {
            'match': (
                r"(?i)^:\S+ 311 \S+ {nick} (?P<username>\S+) (?P<host>\S+) "
                r". :(?P<realname>.*)"
            )
        },
        {
            'match': r"(?i)^:\S+ 312 \S+ {nick} (?P<server>\S+) :(?P<server_desc>.*)"
        },
        {'match': r"(?i)^:\S+ 317 \S+ {nick} (?P<idle>[0-9]+).*"},
        {'match': r"(?i)^:\S+ 319 \S+ {nick} :(?P<channels>.*)", 'multi': True},
        {
            'match': (
                r"(?i)^:\S+ 330 \S+ {nick} (?P<account>\S+) :(?P<account_desc>.*)"
            )
        },
        {'match': r"(?i)^:\S+ 671 \S+ {nick} :(?P<connection>.*)"},
        {
            'match': r"(?i)^:\S+ (?P<retcode>(318|401)) \S+ (?P<nick>{nick}) :.*",
            'final': True,
        },
    )

    def process_results(self, results=None, **value):
        """Aggregate and structure WHOIS results into a consolidated dictionary.

        Args:
            results (list): Collected event responses.
            **value: Accumulated data from event processing.

        Returns:
            dict: Structured user information with success status.
        """
        channels = []
        for res in results:
            channels.extend(res.pop('channels', '').split())
            value.update(res)
        value['channels'] = channels
        value['success'] = value.get('retcode') == '318'
        return value


class WhoChannel(AsyncEvents):
    """Handle WHO responses for channel user listings.

    Attributes:
        send_line (str): IRC command template for WHO requests.
    """

    send_line = 'WHO {channel}'

    events = (
        {
            'match': (
                r"(?i)^:\S+ 352 \S+ {channel} (?P<user>\S+) (?P<host>\S+) "
                r"(?P<server>\S+) (?P<nick>\S+) (?P<modes>\S+) "
                r":(?P<hopcount>\S+) (?P<realname>.*)"
            ),
            'multi': True,
        },
        {'match': r"(?i)^:\S+ (?P<retcode>(315|401)) \S+ {channel} :.*", 'final': True},
    )

    def process_results(self, results=None, **value):
        """Compile WHO channel results into a list of users.

        Args:
            results (list): Raw event response data.
            **value: Extracted key-value pairs from responses.

        Returns:
            dict: Processed result with user list and success status.
        """
        users = []
        for res in results:
            if 'retcode' in res:
                value.update(res)
            else:
                res['mask'] = utils.IrcString(f"{res['nick']}!{res['user']}@{res['host']}")
                users.append(res)
        value['users'] = users
        value['success'] = value.get('retcode') == '315'
        return value


@dec.plugin
class Async:
    """Expose asynchronous IRC command interfaces for plugin usage."""

    def __init__(self, context):
        """Initialize with the bot context and register async commands."""
        self.context = context
        self.context.async_cmds = self
        self.async_whois = Whois(context)
        self.async_who_channel = WhoChannel(context)

    def send_message(self, target: str, message: str):
        """Send a message to a target (channel or user).

        Args:
            target (str): Recipient channel or nickname.
            message (str): Message content to send.
        """
        self.context.privmsg(target, message)

    @dec.extend
    def whois(self, nick: str, timeout: int = 20):
        """Initiate a WHOIS query for a nickname.

        Args:
            nick (str): Nickname to query.
            timeout (int): Response timeout in seconds.

        Returns:
            Awaitable[dict]: WHOIS result data.
        """
        return self.async_whois(nick=nick.lower(), timeout=timeout)

    @dec.extend
    def who(self, target: str, timeout: int = 20):
        """Perform a WHO query on a channel or user.

        Args:
            target (str): Channel or nickname to query.
            timeout (int): Response timeout in seconds.

        Returns:
            Awaitable[dict] | None: WHO results for channels, else None.
        """
        target = target.lower()
        if target.startswith('#'):
            return self.async_who_channel(channel=target, timeout=timeout)
        return None