use axum::extract::{Path, State};
use itertools::Itertools;

use crate::{channel::app, test::fixtures};

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

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

    // Send the request

    let deleter = fixtures::identity::create(&app, &fixtures::now()).await;
    let response = super::handler(
        State(app.clone()),
        Path(channel.id.clone()),
        fixtures::now(),
        deleter,
    )
    .await
    .expect("deleting a valid channel succeeds");

    // Verify the response

    assert_eq!(channel.id, response.id);

    // Verify the semantics

    let snapshot = app.boot().snapshot().await.expect("boot always succeeds");
    let created = snapshot
        .events
        .into_iter()
        .filter_map(fixtures::event::channel)
        .filter_map(fixtures::event::channel::created)
        .exactly_one()
        .expect("only one channel has been created");
    // We don't expect `channel` to match the event exactly, as the name will have been
    // tombstoned and the channel given a `deleted_at` date.
    assert_eq!(channel.id, created.channel.id);
}

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

    let app = fixtures::scratch_app().await;

    // Send the request

    let deleter = fixtures::identity::create(&app, &fixtures::now()).await;
    let channel = fixtures::channel::fictitious();
    let super::Error(error) = super::handler(
        State(app.clone()),
        Path(channel.clone()),
        fixtures::now(),
        deleter,
    )
    .await
    .expect_err("deleting a nonexistent channel fails");

    // Verify the response

    assert!(matches!(error, app::DeleteError::NotFound(id) if id == channel));
}

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

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

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

    // Send the request

    let deleter = fixtures::identity::create(&app, &fixtures::now()).await;
    let super::Error(error) = super::handler(
        State(app.clone()),
        Path(channel.id.clone()),
        fixtures::now(),
        deleter,
    )
    .await
    .expect_err("deleting a deleted channel fails");

    // Verify the response

    assert!(matches!(error, app::DeleteError::Deleted(id) if id == channel.id));
}

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

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

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

    // Send the request

    let deleter = fixtures::identity::create(&app, &fixtures::now()).await;
    let super::Error(error) = super::handler(
        State(app.clone()),
        Path(channel.id.clone()),
        fixtures::now(),
        deleter,
    )
    .await
    .expect_err("deleting an expired channel fails");

    // Verify the response

    assert!(matches!(error, app::DeleteError::Deleted(id) if id == channel.id));
}

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

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

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

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

    // Send the request

    let deleter = fixtures::identity::create(&app, &fixtures::now()).await;
    let super::Error(error) = super::handler(
        State(app.clone()),
        Path(channel.id.clone()),
        fixtures::now(),
        deleter,
    )
    .await
    .expect_err("deleting a purged channel fails");

    // Verify the response

    assert!(matches!(error, app::DeleteError::NotFound(id) if id == channel.id));
}

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

    let app = fixtures::scratch_app().await;
    let channel = fixtures::channel::create(&app, &fixtures::now()).await;
    let sender = fixtures::user::create(&app, &fixtures::now()).await;
    fixtures::message::send(&app, &channel, &sender, &fixtures::now()).await;

    // Send the request

    let deleter = fixtures::identity::create(&app, &fixtures::now()).await;
    let super::Error(error) = super::handler(
        State(app.clone()),
        Path(channel.id.clone()),
        fixtures::now(),
        deleter,
    )
    .await
    .expect_err("deleting a channel with messages fails");

    // Verify the response

    assert!(matches!(error, app::DeleteError::NotEmpty(id) if id == channel.id));
}