use crate::database::*;
use crate::util::result::{Error, Result};

use mongodb::bson::doc;

#[delete("/<target>/messages/<msg>")]
pub async fn req(user: User, target: Ref, msg: Ref) -> Result<()> {
    let channel = target.fetch_channel().await?;

    let perm = permissions::channel::calculate(&user, &channel).await;
    if !perm.get_view() {
        Err(Error::LabelMe)?
    }

    let message = msg.fetch_message().await?;
    if message.author != user.id && !perm.get_manage_messages() {
        match channel {
            Channel::SavedMessages { .. } => unreachable!(),
            _ => Err(Error::CannotEditMessage)?,
        }
    }

    get_collection("messages")
        .delete_one(
            doc! {
                "_id": &message.id
            },
            None,
        )
        .await
        .map_err(|_| Error::DatabaseError {
            operation: "delete_one",
            with: "message",
        })?;

    message.publish_delete().await?;

    Ok(())
}