use axum::extract::State;
use axum_extra::extract::Query;
use futures::{future, stream::StreamExt as _};

use crate::{
    event::routes::get,
    test::fixtures::{self, future::Expect as _},
};

#[tokio::test]
async fn creating() {
    // Set up the environment

    let app = fixtures::scratch_app().await;
    let resume_point = fixtures::boot::resume_point(&app).await;

    // Subscribe

    let subscriber = fixtures::identity::create(&app, &fixtures::now()).await;
    let get::Response(events) = get::handler(
        State(app.clone()),
        subscriber,
        None,
        Query(get::QueryParams { resume_point }),
    )
    .await
    .expect("subscribe never fails");

    // Create a channel

    let name = fixtures::channel::propose();
    let channel = app
        .channels()
        .create(&name, &fixtures::now())
        .await
        .expect("creating a channel succeeds");

    // Verify channel created event

    events
        .filter_map(fixtures::event::channel)
        .filter_map(fixtures::event::channel::created)
        .filter(|event| future::ready(event.channel == channel))
        .next()
        .expect_some("channel created event is delivered")
        .await;
}

#[tokio::test]
async fn previously_created() {
    // Set up the environment

    let app = fixtures::scratch_app().await;
    let resume_point = fixtures::boot::resume_point(&app).await;

    // Create a channel

    let name = fixtures::channel::propose();
    let channel = app
        .channels()
        .create(&name, &fixtures::now())
        .await
        .expect("creating a channel succeeds");

    // Subscribe

    let subscriber = fixtures::identity::create(&app, &fixtures::now()).await;
    let get::Response(events) = get::handler(
        State(app.clone()),
        subscriber,
        None,
        Query(get::QueryParams { resume_point }),
    )
    .await
    .expect("subscribe never fails");

    // Verify channel created event

    let _ = events
        .filter_map(fixtures::event::channel)
        .filter_map(fixtures::event::channel::created)
        .filter(|event| future::ready(event.channel == channel))
        .next()
        .expect_some("channel created event is delivered")
        .await;
}

#[tokio::test]
async fn expiring() {
    // Set up the environment

    let app = fixtures::scratch_app().await;
    let channel = fixtures::channel::create(&app, &fixtures::ancient()).await;
    let resume_point = fixtures::boot::resume_point(&app).await;

    // Subscribe

    let subscriber = fixtures::identity::create(&app, &fixtures::now()).await;
    let get::Response(events) = get::handler(
        State(app.clone()),
        subscriber,
        None,
        Query(get::QueryParams { resume_point }),
    )
    .await
    .expect("subscribe never fails");

    // Expire channels

    app.channels()
        .expire(&fixtures::now())
        .await
        .expect("expiring channels always succeeds");

    // Check for expiry event
    let _ = events
        .filter_map(fixtures::event::channel)
        .filter_map(fixtures::event::channel::deleted)
        .filter(|event| future::ready(event.id == channel.id))
        .next()
        .expect_some("a deleted channel event will be delivered")
        .await;
}

#[tokio::test]
async fn previously_expired() {
    // Set up the environment

    let app = fixtures::scratch_app().await;
    let channel = fixtures::channel::create(&app, &fixtures::ancient()).await;
    let resume_point = fixtures::boot::resume_point(&app).await;

    // Expire channels

    app.channels()
        .expire(&fixtures::now())
        .await
        .expect("expiring channels always succeeds");

    // Subscribe

    let subscriber = fixtures::identity::create(&app, &fixtures::now()).await;
    let get::Response(events) = get::handler(
        State(app.clone()),
        subscriber,
        None,
        Query(get::QueryParams { resume_point }),
    )
    .await
    .expect("subscribe never fails");

    // Check for expiry event
    let _ = events
        .filter_map(fixtures::event::channel)
        .filter_map(fixtures::event::channel::deleted)
        .filter(|event| future::ready(event.id == channel.id))
        .next()
        .expect_some("a deleted channel event will be delivered")
        .await;
}

#[tokio::test]
async fn deleting() {
    // Set up the environment

    let app = fixtures::scratch_app().await;
    let channel = fixtures::channel::create(&app, &fixtures::now()).await;
    let resume_point = fixtures::boot::resume_point(&app).await;

    // Subscribe

    let subscriber = fixtures::identity::create(&app, &fixtures::now()).await;
    let get::Response(events) = get::handler(
        State(app.clone()),
        subscriber,
        None,
        Query(get::QueryParams { resume_point }),
    )
    .await
    .expect("subscribe never fails");

    // Delete the channel

    app.channels()
        .delete(&channel.id, &fixtures::now())
        .await
        .expect("deleting a valid channel succeeds");

    // Check for delete event
    let _ = events
        .filter_map(fixtures::event::channel)
        .filter_map(fixtures::event::channel::deleted)
        .filter(|event| future::ready(event.id == channel.id))
        .next()
        .expect_some("a deleted channel event will be delivered")
        .await;
}

#[tokio::test]
async fn previously_deleted() {
    // Set up the environment

    let app = fixtures::scratch_app().await;
    let channel = fixtures::channel::create(&app, &fixtures::now()).await;
    let resume_point = fixtures::boot::resume_point(&app).await;

    // Delete the channel

    app.channels()
        .delete(&channel.id, &fixtures::now())
        .await
        .expect("deleting a valid channel succeeds");

    // Subscribe

    let subscriber = fixtures::identity::create(&app, &fixtures::now()).await;
    let get::Response(events) = get::handler(
        State(app.clone()),
        subscriber,
        None,
        Query(get::QueryParams { resume_point }),
    )
    .await
    .expect("subscribe never fails");

    // Check for expiry event
    let _ = events
        .filter_map(fixtures::event::channel)
        .filter_map(fixtures::event::channel::deleted)
        .filter(|event| future::ready(event.id == channel.id))
        .next()
        .expect_some("a deleted channel event will be delivered")
        .await;
}

#[tokio::test]
async fn previously_purged() {
    // Set up the environment

    let app = fixtures::scratch_app().await;
    let channel = fixtures::channel::create(&app, &fixtures::ancient()).await;
    let resume_point = fixtures::boot::resume_point(&app).await;

    // Delete and purge the channel

    app.channels()
        .delete(&channel.id, &fixtures::ancient())
        .await
        .expect("deleting a valid channel succeeds");

    app.channels()
        .purge(&fixtures::now())
        .await
        .expect("purging channels always succeeds");

    // Subscribe

    let subscriber = fixtures::identity::create(&app, &fixtures::now()).await;
    let get::Response(events) = get::handler(
        State(app.clone()),
        subscriber,
        None,
        Query(get::QueryParams { resume_point }),
    )
    .await
    .expect("subscribe never fails");

    // Check for expiry event
    events
        .filter_map(fixtures::event::channel)
        .filter_map(fixtures::event::channel::deleted)
        .filter(|event| future::ready(event.id == channel.id))
        .next()
        .expect_wait("deleted channel events not delivered")
        .await;
}