//! # apalis-postgres
//!
//! Allows using postgres as a Backend
//!
//! ## Postgres Example
//!  ```rust,no_run
//! use apalis::prelude::*;
//! # use apalis_sql::postgres::PostgresStorage;
//! # use apalis_sql::postgres::PgPool;

//!  use email_service::Email;
//!
//!  #[tokio::main]
//!  async fn main() -> std::io::Result<()> {
//!      std::env::set_var("RUST_LOG", "debug,sqlx::query=error");
//!      let database_url = std::env::var("DATABASE_URL").expect("Must specify url to db");
//!      let pool = PgPool::connect(&database_url).await.unwrap();
//!      
//!      PostgresStorage::setup(&pool).await.unwrap();
//!      let pg: PostgresStorage<Email> = PostgresStorage::new(pool);
//!
//!      async fn send_email(job: Email, data: Data<usize>) -> Result<(), Error> {
//!          /// execute job
//!          Ok(())
//!      }
//!     // This can be even in another program/language
//!     // let query = "Select apalis.push_job('apalis::Email', json_build_object('subject', 'Test apalis', 'to', 'test1@example.com', 'text', 'Lorem Ipsum'));";
//!     // pg.execute(query).await.unwrap();
//!
//!      Monitor::<TokioExecutor>::new()
//!          .register_with_count(4, {
//!              WorkerBuilder::new(&format!("tasty-avocado"))
//!                  .data(0usize)
//!                  .backend(pg)
//!                  .build_fn(send_email)
//!          })
//!          .run()
//!          .await
//!  }
//! ```
use crate::context::SqlContext;
use crate::{calculate_status, Config};
use apalis_core::codec::json::JsonCodec;
use apalis_core::error::Error;
use apalis_core::layers::{Ack, AckLayer};
use apalis_core::notify::Notify;
use apalis_core::poller::controller::Controller;
use apalis_core::poller::stream::BackendStream;
use apalis_core::poller::Poller;
use apalis_core::request::{Request, RequestStream};
use apalis_core::storage::Storage;
use apalis_core::task::namespace::Namespace;
use apalis_core::task::task_id::TaskId;
use apalis_core::worker::WorkerId;
use apalis_core::{Backend, Codec};
use chrono::{DateTime, Utc};
use futures::channel::mpsc;
use futures::StreamExt;
use futures::{select, stream, SinkExt};
use log::error;
use serde::{de::DeserializeOwned, Serialize};
use serde_json::Value;
use sqlx::postgres::PgListener;
use sqlx::{Pool, Postgres, Row};
use std::any::type_name;
use std::convert::TryInto;
use std::fmt::Debug;
use std::sync::Arc;
use std::{fmt, io};
use std::{marker::PhantomData, time::Duration};

type Timestamp = i64;

pub use sqlx::postgres::PgPool;

use crate::from_row::SqlRequest;

/// Represents a [Storage] that persists to Postgres
// #[derive(Debug)]
pub struct PostgresStorage<T, C = JsonCodec<serde_json::Value>>
where
    C: Codec,
{
    pool: PgPool,
    job_type: PhantomData<T>,
    codec: PhantomData<C>,
    config: Config,
    controller: Controller,
    ack_notify: Notify<(SqlContext, Result<C::Compact, Error>)>,
    subscription: Option<PgSubscription>,
}

impl<T, C: Codec> Clone for PostgresStorage<T, C> {
    fn clone(&self) -> Self {
        PostgresStorage {
            pool: self.pool.clone(),
            job_type: PhantomData,
            codec: PhantomData,
            config: self.config.clone(),
            controller: self.controller.clone(),
            ack_notify: self.ack_notify.clone(),
            subscription: self.subscription.clone(),
        }
    }
}

impl<T, C: Codec> fmt::Debug for PostgresStorage<T, C> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("PostgresStorage")
            .field("pool", &self.pool)
            .field("job_type", &"PhantomData<T>")
            .field("controller", &self.controller)
            .field("config", &self.config)
            .field("codec", &std::any::type_name::<C>())
            // .field("ack_notify", &std::any::type_name_of_val(&self.ack_notify))
            .finish()
    }
}

impl<T, C, Res> Backend<Request<T>, Res> for PostgresStorage<T, C>
where
    T: Serialize + DeserializeOwned + Sync + Send + Unpin + 'static,
    C: Codec<Compact = serde_json::Value> + Send + 'static,
{
    type Stream = BackendStream<RequestStream<Request<T>>>;

    type Layer = AckLayer<PostgresStorage<T, C>, T, Res>;

    fn poll<Svc>(mut self, worker: WorkerId) -> Poller<Self::Stream, Self::Layer> {
        let layer = AckLayer::new(self.clone());
        let subscription = self.subscription.clone();
        let config = self.config.clone();
        let controller = self.controller.clone();
        let (mut tx, rx) = mpsc::channel(self.config.buffer_size);
        let ack_notify = self.ack_notify.clone();
        let pool = self.pool.clone();
        let heartbeat = async move {
            let mut keep_alive_stm = apalis_core::interval::interval(config.keep_alive).fuse();
            let mut ack_stream = ack_notify.clone().ready_chunks(config.buffer_size).fuse();

            let mut poll_next_stm = apalis_core::interval::interval(config.poll_interval).fuse();

            let mut pg_notification = subscription
                .map(|stm| stm.notify.boxed().fuse())
                .unwrap_or(stream::iter(vec![]).boxed().fuse());

            async fn fetch_next_batch<
                T: Unpin + DeserializeOwned + Send + 'static,
                C: Codec<Compact = Value>,
            >(
                storage: &mut PostgresStorage<T, C>,
                worker: &WorkerId,
                tx: &mut mpsc::Sender<Result<Option<Request<T>>, Error>>,
            ) -> Result<(), Error> {
                let res = storage
                    .fetch_next(worker)
                    .await
                    .map_err(|e| Error::SourceError(Arc::new(Box::new(e))))?;
                for job in res {
                    tx.send(Ok(Some(job)))
                        .await
                        .map_err(|e| Error::SourceError(Arc::new(Box::new(e))))?;
                }
                Ok(())
            }

            if let Err(e) = self
                .keep_alive_at::<Self::Layer>(&worker, Utc::now().timestamp())
                .await
            {
                error!("KeepAliveError: {}", e);
            }

            loop {
                select! {
                    _ = keep_alive_stm.next() => {
                        if let Err(e) = self.keep_alive_at::<Self::Layer>(&worker, Utc::now().timestamp()).await {
                            error!("KeepAliveError: {}", e);
                        }
                    }
                    ids = ack_stream.next() => {
                        if let Some(ids) = ids {
                            let ack_ids: Vec<(String, String, String, String, u64)> = ids.iter().map(|(ctx, res)| {
                                (ctx.id().to_string(), ctx.lock_by().clone().unwrap().to_string(), serde_json::to_string(&res.as_ref().map_err(|e| e.to_string())).unwrap(), calculate_status(res).to_string(), (ctx.attempts().current() + 1) as u64 )
                            }).collect();
                            let query =
                                "UPDATE apalis.jobs
                                    SET status = Q.status, 
                                        done_at = now(), 
                                        lock_by = Q.worker_id, 
                                        last_error = Q.result, 
                                        attempts = Q.attempts 
                                    FROM (
                                        SELECT (value->>0)::text as id, 
                                            (value->>1)::text as worker_id, 
                                            (value->>2)::text as result, 
                                            (value->>3)::text as status, 
                                            (value->>4)::int as attempts 
                                        FROM json_array_elements($1::json)
                                    ) Q
                                    WHERE apalis.jobs.id = Q.id;
                                    ";
                            if let Err(e) = sqlx::query(query)
                                .bind(serde_json::to_value(&ack_ids).unwrap())
                                .execute(&pool)
                                .await
                            {
                                panic!("AckError: {e}");
                            }
                        }
                    }
                    _ = poll_next_stm.next() => {
                        if let Err(e) = fetch_next_batch(&mut self, &worker, &mut tx).await {
                            error!("FetchNextError: {e}");

                        }
                    }
                    _ = pg_notification.next() => {
                        if let Err(e) = fetch_next_batch(&mut self, &worker, &mut tx).await {
                            error!("PgNotificationError: {e}");
                        }
                    }


                };
            }
        };
        Poller::new_with_layer(BackendStream::new(rx.boxed(), controller), heartbeat, layer)
    }
}

impl PostgresStorage<()> {
    /// Get postgres migrations without running them
    #[cfg(feature = "migrate")]
    pub fn migrations() -> sqlx::migrate::Migrator {
        sqlx::migrate!("migrations/postgres")
    }

    /// Do migrations for Postgres
    #[cfg(feature = "migrate")]
    pub async fn setup(pool: &Pool<Postgres>) -> Result<(), sqlx::Error> {
        Self::migrations().run(pool).await?;
        Ok(())
    }
}

impl<T> PostgresStorage<T> {
    /// New Storage from [PgPool]
    pub fn new(pool: PgPool) -> Self {
        Self::new_with_config(pool, Config::new(type_name::<T>()))
    }
    /// New Storage from [PgPool] and custom config
    pub fn new_with_config(pool: PgPool, config: Config) -> Self {
        Self {
            pool,
            job_type: PhantomData,
            codec: PhantomData,
            config,
            controller: Controller::new(),
            ack_notify: Notify::new(),
            subscription: None,
        }
    }

    /// Expose the pool for other functionality, eg custom migrations
    pub fn pool(&self) -> &Pool<Postgres> {
        &self.pool
    }

    /// Expose the config
    pub fn config(&self) -> &Config {
        &self.config
    }
}

impl<T, C: Codec> PostgresStorage<T, C> {
    /// Expose the codec
    pub fn codec(&self) -> &PhantomData<C> {
        &self.codec
    }

    async fn keep_alive_at<Service>(
        &mut self,
        worker_id: &WorkerId,
        last_seen: Timestamp,
    ) -> Result<(), sqlx::Error> {
        let last_seen = DateTime::from_timestamp(last_seen, 0).ok_or(sqlx::Error::Io(
            io::Error::new(io::ErrorKind::InvalidInput, "Invalid Timestamp"),
        ))?;
        let worker_type = self.config.namespace.clone();
        let storage_name = std::any::type_name::<Self>();
        let query = "INSERT INTO apalis.workers (id, worker_type, storage_name, layers, last_seen)
                VALUES ($1, $2, $3, $4, $5)
                ON CONFLICT (id) DO
                   UPDATE SET last_seen = EXCLUDED.last_seen";
        sqlx::query(query)
            .bind(worker_id.to_string())
            .bind(worker_type)
            .bind(storage_name)
            .bind(std::any::type_name::<Service>())
            .bind(last_seen)
            .execute(&self.pool)
            .await?;
        Ok(())
    }
}

/// A listener that listens to Postgres notifications
#[derive(Debug)]
pub struct PgListen {
    listener: PgListener,
    subscriptions: Vec<(String, PgSubscription)>,
}

/// A postgres subscription
#[derive(Debug, Clone)]
pub struct PgSubscription {
    notify: Notify<()>,
}

impl PgListen {
    /// Build a new listener.
    ///
    /// Maintaining a connection can be expensive, its encouraged you only create one [PgListen] and share it with multiple [PostgresStorage]
    pub async fn new(pool: PgPool) -> Result<Self, sqlx::Error> {
        let listener = PgListener::connect_with(&pool).await?;
        Ok(Self {
            listener,
            subscriptions: Vec::new(),
        })
    }

    /// Add a new subscription with a storage
    pub fn subscribe_with<T>(&mut self, storage: &mut PostgresStorage<T>) {
        let sub = PgSubscription {
            notify: Notify::new(),
        };
        self.subscriptions
            .push((storage.config.namespace.to_owned(), sub.clone()));
        storage.subscription = Some(sub)
    }

    /// Add a new subscription
    pub fn subscribe(&mut self, namespace: &str) -> PgSubscription {
        let sub = PgSubscription {
            notify: Notify::new(),
        };
        self.subscriptions.push((namespace.to_owned(), sub.clone()));
        sub
    }
    /// Start listening to jobs
    pub async fn listen(mut self) -> Result<(), sqlx::Error> {
        self.listener.listen("apalis::job").await?;
        let mut notification = self.listener.into_stream();
        while let Some(Ok(res)) = notification.next().await {
            let _: Vec<_> = self
                .subscriptions
                .iter()
                .filter(|s| s.0 == res.payload())
                .map(|s| s.1.notify.notify(()))
                .collect();
        }
        Ok(())
    }
}

impl<T, C> PostgresStorage<T, C>
where
    T: DeserializeOwned + Send + Unpin + 'static,
    C: Codec<Compact = serde_json::Value>,
{
    async fn fetch_next(&mut self, worker_id: &WorkerId) -> Result<Vec<Request<T>>, sqlx::Error> {
        let config = &self.config;
        let job_type = &config.namespace;
        let fetch_query = "Select * from apalis.get_jobs($1, $2, $3);";
        let jobs: Vec<SqlRequest<serde_json::Value>> = sqlx::query_as(fetch_query)
            .bind(worker_id.to_string())
            .bind(job_type)
            // https://docs.rs/sqlx/latest/sqlx/postgres/types/index.html
            .bind(
                i32::try_from(config.buffer_size)
                    .map_err(|e| sqlx::Error::Io(io::Error::new(io::ErrorKind::InvalidInput, e)))?,
            )
            .fetch_all(&self.pool)
            .await?;
        let jobs: Vec<_> = jobs
            .into_iter()
            .map(|job| {
                let (req, ctx) = job.into_tuple();
                let req = C::decode(req)
                    .map_err(|e| sqlx::Error::Io(io::Error::new(io::ErrorKind::InvalidData, e)))
                    .unwrap();
                let req = SqlRequest::new(req, ctx);
                let mut req: Request<T> = req.into();
                req.insert(Namespace(self.config.namespace.clone()));
                req
            })
            .collect();
        Ok(jobs)
    }
}

impl<T, C> Storage for PostgresStorage<T, C>
where
    T: Serialize + DeserializeOwned + Send + 'static + Unpin + Sync,
    C: Codec<Compact = Value> + Send + 'static,
{
    type Job = T;

    type Error = sqlx::Error;

    type Identifier = TaskId;

    /// Push a job to Postgres [Storage]
    ///
    /// # SQL Example
    ///
    /// ```sql
    /// Select apalis.push_job(job_type::text, job::json);
    /// ```
    async fn push(&mut self, job: Self::Job) -> Result<TaskId, sqlx::Error> {
        let id = TaskId::new();
        let query = "INSERT INTO apalis.jobs VALUES ($1, $2, $3, 'Pending', 0, 25, NOW() , NULL, NULL, NULL, NULL)";

        let job = C::encode(&job)
            .map_err(|e| sqlx::Error::Io(io::Error::new(io::ErrorKind::InvalidData, e)))?;
        let job_type = self.config.namespace.clone();
        sqlx::query(query)
            .bind(job)
            .bind(id.to_string())
            .bind(&job_type)
            .execute(&self.pool)
            .await?;
        Ok(id)
    }

    async fn schedule(&mut self, job: Self::Job, on: Timestamp) -> Result<TaskId, sqlx::Error> {
        let query =
            "INSERT INTO apalis.jobs VALUES ($1, $2, $3, 'Pending', 0, 25, $4, NULL, NULL, NULL, NULL)";

        let id = TaskId::new();
        let on = DateTime::from_timestamp(on, 0);
        let job = C::encode(&job)
            .map_err(|e| sqlx::Error::Io(io::Error::new(io::ErrorKind::InvalidInput, e)))?;
        let job_type = self.config.namespace.clone();
        sqlx::query(query)
            .bind(job)
            .bind(id.to_string())
            .bind(job_type)
            .bind(on)
            .execute(&self.pool)
            .await?;
        Ok(id)
    }

    async fn fetch_by_id(
        &mut self,
        job_id: &TaskId,
    ) -> Result<Option<Request<Self::Job>>, sqlx::Error> {
        let fetch_query = "SELECT * FROM apalis.jobs WHERE id = $1";
        let res: Option<SqlRequest<serde_json::Value>> = sqlx::query_as(fetch_query)
            .bind(job_id.to_string())
            .fetch_optional(&self.pool)
            .await?;

        match res {
            None => Ok(None),
            Some(job) => Ok(Some({
                let (req, ctx) = job.into_tuple();
                let req = C::decode(req)
                    .map_err(|e| sqlx::Error::Io(io::Error::new(io::ErrorKind::InvalidData, e)))?;
                let req = SqlRequest::new(req, ctx);
                let mut req: Request<T> = req.into();
                req.insert(Namespace(self.config.namespace.clone()));
                req
            })),
        }
    }

    async fn len(&mut self) -> Result<i64, sqlx::Error> {
        let query = "Select Count(*) as count from apalis.jobs where status='Pending'";
        let record = sqlx::query(query).fetch_one(&self.pool).await?;
        record.try_get("count")
    }

    async fn reschedule(&mut self, job: Request<T>, wait: Duration) -> Result<(), sqlx::Error> {
        let ctx = job
            .get::<SqlContext>()
            .ok_or(sqlx::Error::Io(io::Error::new(
                io::ErrorKind::InvalidData,
                "Missing SqlContext",
            )))?;
        let job_id = ctx.id();
        let on = Utc::now() + wait;
        let mut tx = self.pool.acquire().await?;
        let query =
                "UPDATE apalis.jobs SET status = 'Pending', done_at = NULL, lock_by = NULL, lock_at = NULL, run_at = $2 WHERE id = $1";

        sqlx::query(query)
            .bind(job_id.to_string())
            .bind(on)
            .execute(&mut *tx)
            .await?;
        Ok(())
    }

    async fn update(&mut self, job: Request<Self::Job>) -> Result<(), sqlx::Error> {
        let ctx = job
            .get::<SqlContext>()
            .ok_or(sqlx::Error::Io(io::Error::new(
                io::ErrorKind::InvalidData,
                "Missing SqlContext",
            )))?;
        let job_id = ctx.id();
        let status = ctx.status().to_string();
        let attempts: i32 = ctx
            .attempts()
            .current()
            .try_into()
            .map_err(|e| sqlx::Error::Io(io::Error::new(io::ErrorKind::InvalidData, e)))?;
        let done_at = *ctx.done_at();
        let lock_by = ctx.lock_by().clone();
        let lock_at = *ctx.lock_at();
        let last_error = ctx.last_error().clone();

        let mut tx = self.pool.acquire().await?;
        let query =
                "UPDATE apalis.jobs SET status = $1, attempts = $2, done_at = $3, lock_by = $4, lock_at = $5, last_error = $6 WHERE id = $7";
        sqlx::query(query)
            .bind(status.to_owned())
            .bind(attempts)
            .bind(done_at)
            .bind(lock_by.map(|w| w.name().to_string()))
            .bind(lock_at)
            .bind(last_error)
            .bind(job_id.to_string())
            .execute(&mut *tx)
            .await?;
        Ok(())
    }

    async fn is_empty(&mut self) -> Result<bool, sqlx::Error> {
        Ok(self.len().await? == 0)
    }

    async fn vacuum(&mut self) -> Result<usize, sqlx::Error> {
        let query = "Delete from apalis.jobs where status='Done'";
        let record = sqlx::query(query).execute(&self.pool).await?;
        Ok(record.rows_affected().try_into().unwrap_or_default())
    }
}

impl<T, Res, C> Ack<T, Res> for PostgresStorage<T, C>
where
    T: Sync + Send,
    Res: Serialize + Sync,
    C: Codec<Compact = Value> + Send,
{
    type Context = SqlContext;
    type AckError = sqlx::Error;
    async fn ack(
        &mut self,
        ctx: &Self::Context,
        res: &Result<Res, apalis_core::error::Error>,
    ) -> Result<(), sqlx::Error> {
        self.ack_notify
            .notify((
                ctx.clone(),
                res.as_ref()
                    .map(|r| {
                        C::encode(r)
                            .map_err(|e| {
                                sqlx::Error::Io(io::Error::new(io::ErrorKind::Interrupted, e))
                            })
                            .unwrap()
                    })
                    .map_err(|e| e.clone()),
            ))
            .map_err(|e| sqlx::Error::Io(io::Error::new(io::ErrorKind::Interrupted, e)))?;

        Ok(())
    }
}

impl<T, C: Codec> PostgresStorage<T, C> {
    /// Kill a job
    pub async fn kill(
        &mut self,
        worker_id: &WorkerId,
        task_id: &TaskId,
    ) -> Result<(), sqlx::Error> {
        let mut tx = self.pool.acquire().await?;
        let query =
                "UPDATE apalis.jobs SET status = 'Killed', done_at = now() WHERE id = $1 AND lock_by = $2";
        sqlx::query(query)
            .bind(task_id.to_string())
            .bind(worker_id.to_string())
            .execute(&mut *tx)
            .await?;
        Ok(())
    }

    /// Puts the job instantly back into the queue
    /// Another Worker may consume
    pub async fn retry(
        &mut self,
        worker_id: &WorkerId,
        task_id: &TaskId,
    ) -> Result<(), sqlx::Error> {
        let mut tx = self.pool.acquire().await?;
        let query =
                "UPDATE apalis.jobs SET status = 'Pending', done_at = NULL, lock_by = NULL WHERE id = $1 AND lock_by = $2";
        sqlx::query(query)
            .bind(task_id.to_string())
            .bind(worker_id.to_string())
            .execute(&mut *tx)
            .await?;
        Ok(())
    }

    /// Reenqueue jobs that have been abandoned by their workers
    pub async fn reenqueue_orphaned(&mut self, count: i32) -> Result<(), sqlx::Error> {
        let job_type = self.config.namespace.clone();
        let mut tx = self.pool.acquire().await?;
        let query = "Update apalis.jobs
                            SET status = 'Pending', done_at = NULL, lock_by = NULL, lock_at = NULL, last_error ='Job was abandoned'
                            WHERE id in
                                (SELECT jobs.id from apalis.jobs INNER join apalis.workers ON lock_by = workers.id
                                    WHERE status= 'Running' AND workers.last_seen < (NOW() - INTERVAL '300 seconds')
                                    AND workers.worker_type = $1 ORDER BY lock_at ASC LIMIT $2);";
        sqlx::query(query)
            .bind(job_type)
            .bind(count)
            .execute(&mut *tx)
            .await?;
        Ok(())
    }
}
#[cfg(test)]
mod tests {
    use crate::context::State;
    use crate::sql_storage_tests;

    use super::*;
    use apalis_core::test_utils::DummyService;
    use chrono::Utc;
    use email_service::Email;

    use apalis_core::generic_storage_test;
    use apalis_core::test_utils::apalis_test_service_fn;
    use apalis_core::test_utils::TestWrapper;

    generic_storage_test!(setup);

    sql_storage_tests!(setup::<Email>, PostgresStorage<Email>, Email);

    /// migrate DB and return a storage instance.
    async fn setup<T: Serialize + DeserializeOwned>() -> PostgresStorage<T> {
        let db_url = &std::env::var("DATABASE_URL").expect("No DATABASE_URL is specified");
        let pool = PgPool::connect(&db_url).await.unwrap();
        // Because connections cannot be shared across async runtime
        // (different runtimes are created for each test),
        // we don't share the storage and tests must be run sequentially.
        PostgresStorage::setup(&pool).await.unwrap();
        let mut storage = PostgresStorage::new(pool);
        cleanup(&mut storage, &WorkerId::new("test-worker")).await;
        storage
    }

    /// rollback DB changes made by tests.
    /// Delete the following rows:
    ///  - jobs of the current type
    ///  - worker identified by `worker_id`
    ///
    /// You should execute this function in the end of a test
    async fn cleanup<T>(storage: &mut PostgresStorage<T>, worker_id: &WorkerId) {
        let mut tx = storage
            .pool
            .acquire()
            .await
            .expect("failed to get connection");
        sqlx::query("Delete from apalis.jobs where job_type = $1 OR lock_by = $2")
            .bind(storage.config.namespace())
            .bind(worker_id.to_string())
            .execute(&mut *tx)
            .await
            .expect("failed to delete jobs");
        sqlx::query("Delete from apalis.workers where id = $1")
            .bind(worker_id.to_string())
            .execute(&mut *tx)
            .await
            .expect("failed to delete worker");
    }

    fn example_email() -> Email {
        Email {
            subject: "Test Subject".to_string(),
            to: "example@postgres".to_string(),
            text: "Some Text".to_string(),
        }
    }

    async fn consume_one(
        storage: &mut PostgresStorage<Email>,
        worker_id: &WorkerId,
    ) -> Request<Email> {
        let req = storage.fetch_next(worker_id).await;
        req.unwrap()[0].clone()
    }

    async fn register_worker_at(
        storage: &mut PostgresStorage<Email>,
        last_seen: Timestamp,
    ) -> WorkerId {
        let worker_id = WorkerId::new("test-worker");

        storage
            .keep_alive_at::<DummyService>(&worker_id, last_seen)
            .await
            .expect("failed to register worker");
        worker_id
    }

    async fn register_worker(storage: &mut PostgresStorage<Email>) -> WorkerId {
        register_worker_at(storage, Utc::now().timestamp()).await
    }

    async fn push_email(storage: &mut PostgresStorage<Email>, email: Email) {
        storage.push(email).await.expect("failed to push a job");
    }

    async fn get_job(storage: &mut PostgresStorage<Email>, job_id: &TaskId) -> Request<Email> {
        // add a slight delay to allow background actions like ack to complete
        apalis_core::sleep(Duration::from_secs(2)).await;
        storage
            .fetch_by_id(job_id)
            .await
            .expect("failed to fetch job by id")
            .expect("no job found by id")
    }

    #[tokio::test]
    async fn test_consume_last_pushed_job() {
        let mut storage = setup().await;
        push_email(&mut storage, example_email()).await;

        let worker_id = register_worker(&mut storage).await;

        let job = consume_one(&mut storage, &worker_id).await;
        let ctx = job.get::<SqlContext>().unwrap();
        let job_id = ctx.id();
        // Refresh our job
        let job = get_job(&mut storage, job_id).await;
        let ctx = job.get::<SqlContext>().unwrap();
        assert_eq!(*ctx.status(), State::Running);
        assert_eq!(*ctx.lock_by(), Some(worker_id.clone()));
        assert!(ctx.lock_at().is_some());
    }

    #[tokio::test]
    async fn test_kill_job() {
        let mut storage = setup().await;

        push_email(&mut storage, example_email()).await;

        let worker_id = register_worker(&mut storage).await;

        let job = consume_one(&mut storage, &worker_id).await;
        let ctx = job.get::<SqlContext>().unwrap();
        let job_id = ctx.id();

        storage
            .kill(&worker_id, job_id)
            .await
            .expect("failed to kill job");

        let job = get_job(&mut storage, job_id).await;
        let ctx = job.get::<SqlContext>().unwrap();
        assert_eq!(*ctx.status(), State::Killed);
        assert!(ctx.done_at().is_some());
    }

    #[tokio::test]
    async fn test_heartbeat_renqueueorphaned_pulse_last_seen_6min() {
        let mut storage = setup().await;

        push_email(&mut storage, example_email()).await;
        let six_minutes_ago = Utc::now() - Duration::from_secs(6 * 60);
        let worker_id = register_worker_at(&mut storage, six_minutes_ago.timestamp()).await;

        let job = consume_one(&mut storage, &worker_id).await;
        storage
            .reenqueue_orphaned(5)
            .await
            .expect("failed to heartbeat");
        let ctx = job.get::<SqlContext>().unwrap();
        let job_id = ctx.id();
        let job = get_job(&mut storage, job_id).await;
        let ctx = job.get::<SqlContext>().unwrap();

        assert_eq!(*ctx.status(), State::Pending);
        assert!(ctx.done_at().is_none());
        assert!(ctx.lock_by().is_none());
        assert!(ctx.lock_at().is_none());
        assert_eq!(*ctx.last_error(), Some("Job was abandoned".to_string()));
    }

    #[tokio::test]
    async fn test_heartbeat_renqueueorphaned_pulse_last_seen_4min() {
        let mut storage = setup().await;

        push_email(&mut storage, example_email()).await;

        let four_minutes_ago = Utc::now() - Duration::from_secs(4 * 60);

        let worker_id = register_worker_at(&mut storage, four_minutes_ago.timestamp()).await;

        let job = consume_one(&mut storage, &worker_id).await;
        let ctx = job.get::<SqlContext>().unwrap();

        assert_eq!(*ctx.status(), State::Running);
        storage
            .reenqueue_orphaned(5)
            .await
            .expect("failed to heartbeat");

        let job_id = ctx.id();
        let job = get_job(&mut storage, job_id).await;
        let ctx = job.get::<SqlContext>().unwrap();

        assert_eq!(*ctx.status(), State::Running);
        assert_eq!(*ctx.lock_by(), Some(worker_id.clone()));
    }
}