use axum::extract::{Json, State};
use futures::stream::StreamExt as _;

use super::post;
use crate::{
    channel::{self, app},
    event,
    test::fixtures::{self, future::Immediately as _},
};

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

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

    // Call the endpoint

    let name = fixtures::channel::propose();
    let request = post::Request { name: name.clone() };
    let Json(response_channel) =
        post::handler(State(app.clone()), creator, fixtures::now(), Json(request))
            .await
            .expect("new channel in an empty app");

    // Verify the structure of the response

    assert_eq!(name, response_channel.name);

    // Verify the semantics

    let snapshot = app.boot().snapshot().await.expect("boot always succeeds");
    assert!(snapshot
        .channels
        .iter()
        .any(|channel| channel.name == response_channel.name && channel.id == response_channel.id));

    let mut events = app
        .events()
        .subscribe(None)
        .await
        .expect("subscribing never fails")
        .filter(fixtures::filter::created());

    let event = events
        .next()
        .immediately()
        .await
        .expect("creation event published");

    assert!(matches!(
        event,
        event::Event::Channel(channel::Event::Created(event))
            if event.channel == response_channel
    ));
}

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

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

    // Call the endpoint

    let request = post::Request {
        name: channel.name.clone(),
    };
    let post::Error(error) =
        post::handler(State(app.clone()), creator, fixtures::now(), Json(request))
            .await
            .expect_err("duplicate channel name should fail the request");

    // Verify the structure of the response

    assert!(matches!(
        error,
        app::CreateError::DuplicateName(name) if channel.name == name
    ));
}