import uuid
from typing import TYPE_CHECKING

from tortoise import fields

from .base import TimestampedModel

if TYPE_CHECKING:
    from .channel import Channel


class Post(TimestampedModel):
    message_id = fields.IntField()
    text = fields.TextField()
    deleted_from_channel_at = fields.DatetimeField(null=True)
    published_at = fields.DatetimeField(null=True)

    channel: fields.ForeignKeyRelation['Channel'] = fields.ForeignKeyField(
        'models.Channel', related_name='posts', on_delete=fields.CASCADE, index=True
    )

    if TYPE_CHECKING:
        channel_id: uuid.UUID

    class Meta:
        table = 'post'
        unique_together = (('channel_id', 'message_id'),)

    @property
    def url(self) -> str | None:
        if self.channel.username:
            return f'https://t.me/{self.channel.username}/{self.message_id}'

        telegram_id = self.channel.telegram_id
        if telegram_id is None:
            return None

        channel_id = telegram_id
        if telegram_id < 0:
            channel_id = -telegram_id - 1000000000000

        return f'https://t.me/c/{channel_id}/{self.message_id}'