"""JARVIS reminders."""
import asyncio
from datetime import datetime, timedelta

from dis_snek import Snake
from jarvis_core.db import q
from jarvis_core.db.models import Reminder
from jarvis_core.util import build_embed


async def remind(bot: Snake) -> None:
    """
    Run reminders in the background.

    Args:
        bot: Snake instance
    """
    while True:
        await asyncio.sleep(5)
        reminders = Reminder.find(
            q(remind_at__lte=datetime.utcnow() + timedelta(seconds=5), active=True)
        )
        async for reminder in reminders:
            user = await bot.fetch_user(reminder.user)
            if not user:
                await reminder.delete()
                continue

            embed = build_embed(
                title="You have a reminder!", description=reminder.message, fields=[]
            )
            embed.set_author(
                name=user.username + "#" + user.discriminator, icon_url=user.avatar.url
            )

            embed.set_thumbnail(url=user.avatar.url)

            try:
                await user.send(embed=embed)
            except Exception:
                guild = await bot.fetch_guild(reminder.guild)
                member = await bot.fetch_member(user.id)
                if not member:
                    continue
                channel = await guild.fetch_channel(reminder.channel) if guild else None
                if channel and not reminder.private:
                    await channel.send(f"{member.mention}", embed=embed)
                    await reminder.delete()
                else:
                    await channel.send(
                        f"{member.mention}, you had a private reminder set for now,"
                        " but I couldn't send it to you.\n"
                        f"Use `/reminder fetch {str(reminder.id)}` to view"
                    )
                    reminder.update(q(active=False))
                    await reminder.commit()