use std::collections::HashMap;

use crate::consumers::inbound::internal::*;
use amqprs::{
    channel::{BasicPublishArguments, Channel},
    connection::Connection,
    consumer::AsyncConsumer,
    BasicProperties, Deliver,
};
use anyhow::Result;
use async_trait::async_trait;
use log::debug;
use revolt_database::{events::rabbit::*, Database};

pub struct GenericConsumer {
    #[allow(dead_code)]
    db: Database,
    authifier_db: authifier::Database,
    conn: Option<Connection>,
    channel: Option<Channel>,
}

impl Channeled for GenericConsumer {
    fn get_connection(&self) -> Option<&Connection> {
        if self.conn.is_none() {
            None
        } else {
            Some(self.conn.as_ref().unwrap())
        }
    }

    fn get_channel(&self) -> Option<&Channel> {
        if self.channel.is_none() {
            None
        } else {
            Some(self.channel.as_ref().unwrap())
        }
    }

    fn set_connection(&mut self, conn: Connection) {
        self.conn = Some(conn);
    }

    fn set_channel(&mut self, channel: Channel) {
        self.channel = Some(channel)
    }
}

impl GenericConsumer {
    pub fn new(db: Database, authifier_db: authifier::Database) -> GenericConsumer {
        GenericConsumer {
            db,
            authifier_db,
            conn: None,
            channel: None,
        }
    }

    async fn consume_event(
        &mut self,
        _channel: &Channel,
        _deliver: Deliver,
        _basic_properties: BasicProperties,
        content: Vec<u8>,
    ) -> Result<()> {
        let content = String::from_utf8(content)?;
        let payload: MessageSentPayload = serde_json::from_str(content.as_str())?;

        debug!("Received message event on origin");

        if let Ok(sessions) = self
            .authifier_db
            .find_sessions_with_subscription(&payload.users)
            .await
        {
            let config = revolt_config::config().await;
            for session in sessions {
                if let Some(sub) = session.subscription {
                    let mut sendable = PayloadToService {
                        notification: PayloadKind::MessageNotification(
                            payload.notification.clone(),
                        ),
                        token: sub.auth,
                        user_id: session.user_id,
                        session_id: session.id,
                        extras: HashMap::new(),
                    };

                    let args: BasicPublishArguments;

                    if sub.endpoint == "apn" {
                        args = BasicPublishArguments::new(
                            config.pushd.exchange.as_str(),
                            config.pushd.apn.queue.as_str(),
                        )
                        .finish();
                    } else if sub.endpoint == "fcm" {
                        args = BasicPublishArguments::new(
                            config.pushd.exchange.as_str(),
                            config.pushd.fcm.queue.as_str(),
                        )
                        .finish();
                    } else {
                        // web push (vapid)
                        args = BasicPublishArguments::new(
                            config.pushd.exchange.as_str(),
                            config.pushd.vapid.queue.as_str(),
                        )
                        .finish();
                        sendable.extras.insert("p256dh".to_string(), sub.p256dh);
                        sendable
                            .extras
                            .insert("endpoint".to_string(), sub.endpoint.clone());
                    }

                    let payload = serde_json::to_string(&sendable)?;

                    publish_message(self, payload.into(), args).await;
                }
            }
        }

        Ok(())
    }
}

#[allow(unused_variables)]
#[async_trait]
impl AsyncConsumer for GenericConsumer {
    /// This consumer handles delegating messages into their respective platform queues.
    async fn consume(
        &mut self,
        channel: &Channel,
        deliver: Deliver,
        basic_properties: BasicProperties,
        content: Vec<u8>,
    ) {
        if let Err(err) = self
            .consume_event(channel, deliver, basic_properties, content)
            .await
        {
            revolt_config::capture_anyhow(&err);
            eprintln!("Failed to process generic event: {err:?}");
        }
    }
}