use crate::{database::*, notifications::{events::ClientboundNotification, hive}};
use crate::util::result::{Error, Result};
use serde::{Deserialize, Serialize};
use mongodb::bson::to_document;

#[derive(Serialize, Deserialize, Debug, Clone)]
#[serde(tag = "type")]
pub enum Channel {
    SavedMessages {
        #[serde(rename = "_id")]
        id: String,
        user: String,
    },
    DirectMessage {
        #[serde(rename = "_id")]
        id: String,
        active: bool,
        recipients: Vec<String>,
    },
    Group {
        #[serde(rename = "_id")]
        id: String,
        #[serde(skip_serializing_if = "Option::is_none")]
        nonce: Option<String>,
        name: String,
        owner: String,
        description: String,
        recipients: Vec<String>,
    },
}

impl Channel {
    pub fn id(&self) -> &str {
        match self {
            Channel::SavedMessages { id, .. } => id,
            Channel::DirectMessage { id, .. } => id,
            Channel::Group { id, .. } => id,
        }
    }

    pub async fn publish(self) -> Result<()> {
        get_collection("channels")
            .insert_one(
                to_document(&self).map_err(|_| Error::DatabaseError {
                    operation: "to_bson",
                    with: "channel",
                })?,
                None,
            )
            .await
            .map_err(|_| Error::DatabaseError {
                operation: "insert_one",
                with: "channel",
            })?;
        
        // ! IMPORTANT FIXME: THESE SUBSCRIPTIONS SHOULD BE DONE FROM HIVE NOT HERE!!!
        let channel_id = self.id().to_string();
        match &self {
            Channel::SavedMessages { user, .. } => {
                hive::subscribe_if_exists(user.clone(), channel_id.clone()).ok();
            }
            Channel::DirectMessage { recipients, .. } |
            Channel::Group { recipients, .. } => {
                for recipient in recipients {
                    hive::subscribe_if_exists(recipient.clone(), channel_id.clone()).ok();
                }
            }
        }

        ClientboundNotification::ChannelCreate(self)
            .publish(channel_id)
            .await
            .ok();

        Ok(())
    }
}