//! Open a direct message with another user

use revolt_quark::{Error, Result, Ref, models::{User, Channel}, Database, perms, UserPermission};

use mongodb::bson::doc;
use rocket::{State, serde::json::Json};
use ulid::Ulid;

#[get("/<target>/dm")]
pub async fn req(db: &State<Database>, user: User, target: Ref) -> Result<Json<Channel>> {
    let target = target.as_user(db).await?;

    if let Ok(channel) = db.find_direct_message_channel(&user.id, &target.id).await {
        Ok(Json(channel))
    } else if perms(&user).user(&target).calc_user(db).await.get_send_message() {
        let new_channel = Channel::DirectMessage {
            id: Ulid::new().to_string(),
            active: false,
            recipients: vec! [
                user.id.clone(),
                target.id.clone()
            ],
            last_message_id: None,
        };

        db.insert_channel(&new_channel).await?;
        Ok(Json(new_channel))
    } else {
        Error::from_permission(UserPermission::SendMessage)
    }
}