from snek.system.service import BaseService


class ChannelService(BaseService):
    mapper_name = "channel"

    async def create(
        self,
        label,
        created_by_uid,
        description=None,
        tag=None,
        is_private=False,
        is_listed=True,
    ):
        if label[0] != "#" and is_listed:
            label = f"#{label}"
        count = await self.count(deleted_at=None)
        if not tag and not count:
            tag = "public"
        model = await self.new()
        model["label"] = label
        model["description"] = description
        model["tag"] = tag
        model["created_by_uid"] = created_by_uid
        model["is_private"] = is_private
        model["is_listed"] = is_listed
        if await self.save(model):
            return model
        raise Exception(f"Failed to create channel: {model.errors}.")

    async def ensure_public_channel(self, created_by_uid):
        model = await self.get(is_listed=True, tag="public")
        is_moderator = False
        if not model:
            is_moderator = True
            model = await self.create(
                "public", created_by_uid=created_by_uid, is_listed=True, tag="public"
            )
        await self.app.services.channel_member.create(
            model["uid"],
            created_by_uid,
            is_moderator=is_moderator,
            is_read_only=False,
            is_muted=False,
            is_banned=False,
        )
        return model