#!/usr/bin/env python
# -*- coding: utf-8 -*- 
"""
IRC Bot Plugin for Tracking User Activity with TinyDB.

This plugin tracks user join times, messages, and nickname changes. Provides
a !seen command to check last activity. Stores data in "seen.json".

Dependencies:
    - irc3
    - tinydb
    - ircstyle
    - logging
    - re
"""

from datetime import datetime
from tinydb import TinyDB, Query
import irc3
from irc3.plugins.command import command
import ircstyle
import logging
import re


def truncate(text, length=50):
    """
    Truncate text to specified length, appending "..." if truncated.
    
    Args:
        text (str): Input text
        length (int): Maximum length
    
    Returns:
        str: Truncated text
    """
    if not isinstance(text, str):
        text = str(text)
    return text if len(text) <= length else text[:length] + "..."


@irc3.plugin
class UserActivityTracker:
    """IRC bot plugin to track and report user activity using TinyDB."""

    def __init__(self, bot):
        self.bot = bot
        self.db = TinyDB('seen.json')
        self.users = self.db.table('users')
        self.User = Query()
        self.log = logging.getLogger(__name__)

    @irc3.event(r'(?P<mask>\S+)!.* NICK :?(?P<new_nick>\S+)')
    def handle_nick_change(self, mask, new_nick, **kwargs):
        """Track nickname changes and update the old nickname with the new one."""
        self.log.debug(f"Received old_nick: {mask.nick}, new_nick: {new_nick}, mask: {mask}, kwargs: {kwargs}")
        try:
            now = datetime.now().isoformat()
            host = mask.split('!')[1] if '!' in mask else 'unknown'
            
            # Update the record for the old nickname
            old_user = self.users.get(self.User.nick == mask.nick)
            if old_user:
                # Mark the nickname change in the old user's record
                old_user_data = {
                    'last_nick_change': {'old': mask.nick, 'new': new_nick, 'time': now},
                    'nick': new_nick
                }
                self.users.update(old_user_data, self.User.nick == mask.nick)
            else:
                # Insert a record for the old nickname if it doesn't exist
                self.users.insert({
                    'nick': mask.nick,
                    'host': host,
                    'last_nick_change': {'old': mask.nick, 'new': new_nick, 'time': now},
                    'last_join': None,
                    'last_message': None
                })
            
            # Update or insert the record for the new nickname
            new_user = self.users.get(self.User.nick == new_nick)
            if new_user:
                self.users.update({'host': host}, self.User.nick == new_nick)
            else:
                self.users.insert({
                    'nick': new_nick,
                    'host': host,
                    'last_nick_change': None,
                    'last_join': None,
                    'last_message': None
                })
        except Exception as e:
            self.log.error(f"Error tracking nick change {mask.nick}→{new_nick}: {e}")

    @irc3.event(irc3.rfc.JOIN)
    def handle_join(self, mask, channel, **kwargs):
        """Track when users join a channel."""
        try:
            nick = mask.nick
            host = mask.host
            now = datetime.now().isoformat()
            user = self.users.get(self.User.nick == nick)
            update_data = {'last_join': now, 'host': host}
            
            if user:
                self.users.update(update_data, self.User.nick == nick)
            else:
                self.users.insert({'nick': nick, 'host': host, 'last_join': now,
                                    'last_message': None, 'last_nick_change': None})
        except Exception as e:
            self.log.error(f"Error tracking join for {nick}: {e}")

    @irc3.event(irc3.rfc.PRIVMSG)
    def handle_message(self, target, data, mask, **kwargs):
        """Track user messages."""
        try:
            now = datetime.now().isoformat()
            nick = mask.nick  # Get the nickname from the mask
            host = mask.host  # Get the host from the mask
            message = {'text': data, 'time': now}
            self.users.upsert(
                {'nick': nick, 'host': host, 'last_message': message},
                self.User.nick == nick
            )
        except Exception as e:
            self.log.error(f"Error tracking message from {nick}: {e}")

    @command(permission=None)
    async def seen(self, mask, target, args):
        """Retrieve a user's last activity.
        
        %%seen <nick>
        """
        try:
            requested_nick = args['<nick>']
            user = self.users.get(self.User.nick == requested_nick)
            
            if not user:
                msg = ircstyle.style(f"🚫 {requested_nick} has never been observed.", fg="red")
                self.bot.privmsg(target, msg)
                return

            response = []
            header = ircstyle.style(f"📊 Activity report for {requested_nick}:", fg="blue", bold=True)
            response.append(header)

            # Last join
            if user.get('last_join'):
                join_time = datetime.fromisoformat(user['last_join']).strftime('%Y-%m-%d %H:%M:%S')
                response.append(
                    ircstyle.style("🕒 Last join: ", fg="cyan") +
                    ircstyle.style(join_time, fg="white")
                )

            # Last message
            if user.get('last_message'):
                msg_time = datetime.fromisoformat(user['last_message']['time']).strftime('%Y-%m-%d %H:%M:%S')
                msg_text = truncate(user['last_message']['text'])
                response.append(
                    ircstyle.style("💬 Last message: ", fg="green") +
                    ircstyle.style(f"[{msg_time}] ", fg="grey") +
                    ircstyle.style(msg_text, fg="white", italics=True)
                )

            # Last nick change
            if user.get('last_nick_change'):
                old_nick = user['last_nick_change']['old']
                new_nick = user['last_nick_change']['new']
                change_time = datetime.fromisoformat(user['last_nick_change']['time']).strftime('%Y-%m-%d %H:%M:%S')
                response.append(
                    ircstyle.style(f"📛 Nickname change: ", fg="purple") +
                    ircstyle.style(f"Changed from {old_nick} to {new_nick} at {change_time}", fg="white")
                )

            # Handle no tracked activity
            if len(response) == 1:  # Only header present
                response.append(ircstyle.style("No tracked activities.", fg="yellow"))

            for line in response:
                self.bot.privmsg(target, line)

        except Exception as e:
            self.log.error(f"Error in !seen command: {e}")
            self.bot.privmsg(
                target,
                ircstyle.style("❌ Internal error processing request.", fg="red", bold=True)
            )