# -*- coding: utf-8 -*-
import re
from datetime import datetime

import irc3
from docopt import Dict as DocOptDict
from irc3.plugins.command import command
from irc3.utils import IrcString
from psycopg2 import Error

from . import DatabasePlugin


@irc3.plugin
class Seen(DatabasePlugin):
    requires = ['irc3.plugins.command',
                'bot.plugins.storage']

    @command
    def seen(self, mask: IrcString, target: IrcString, args: DocOptDict):
        """Get last seen date and message for a nick.

        %%seen [<nick>]
        """
        nick = args.get('<nick>', mask.nick)

        # Don't be stupid
        if nick == mask.nick:
            return '{nick}, have you seen in the mirror?'.format(nick=nick)

        # Fetch seen from database
        self.cur.execute('''
        select
          *
        from
          seens
        where
          lower(nick) = lower(%s)
        ''', [nick])
        seen = self.cur.fetchone()

        # No result
        if not seen:
            return 'I\'ve never seen {nick}'.format(nick=nick)

        # Return result
        return '{nick} was last seen {delta} saying: {message}'.format(
            nick=seen['nick'],
            # TODO: relative string delta?
            delta=seen['seen_at'],
            message=re.sub(r'\x01ACTION (.*)\x01', r'/me \1', seen['message']),
        )

    @irc3.event(r'(?i)^:(?P<mask>\S+) PRIVMSG (?P<target>\S+) :(?P<msg>.*)')
    def save(self, mask: str, target: str, msg: str):
        mask = IrcString(mask)

        try:
            # Insert or update if user writes a message
            self.cur.execute('''
            insert into
              seens (nick, host, channel, message, seen_at)
            values
              (%s, %s, %s, %s, %s)
            on conflict (nick) do update set
              host = excluded.host,
              channel = excluded.channel,
              seen_at = excluded.seen_at,
              message = excluded.message
            ''', [mask.nick, mask.host, target, msg, datetime.now()])
            self.con.commit()
        except Error:
            # Rollback transaction on error
            self.con.rollback()