use axum::{
    extract::{Json, State},
    http::StatusCode,
    response::{self, IntoResponse},
};

use crate::{
    app::App,
    channel::{Channel, app},
    clock::RequestedAt,
    error::Internal,
    name::Name,
    token::extract::Identity,
};

pub async fn handler(
    State(app): State<App>,
    _: Identity, // requires auth, but doesn't actually care who you are
    RequestedAt(created_at): RequestedAt,
    Json(request): Json<Request>,
) -> Result<Response, Error> {
    let channel = app
        .channels()
        .create(&request.name, &created_at)
        .await
        .map_err(Error)?;

    Ok(Response(channel))
}

#[derive(serde::Deserialize)]
pub struct Request {
    pub name: Name,
}

#[derive(Debug)]
pub struct Response(pub Channel);

impl IntoResponse for Response {
    fn into_response(self) -> response::Response {
        let Self(channel) = self;
        (StatusCode::ACCEPTED, Json(channel)).into_response()
    }
}

#[derive(Debug)]
pub struct Error(pub app::CreateError);

impl IntoResponse for Error {
    fn into_response(self) -> response::Response {
        let Self(error) = self;
        #[allow(clippy::match_wildcard_for_single_variants)]
        match error {
            app::CreateError::DuplicateName(_) => {
                (StatusCode::CONFLICT, error.to_string()).into_response()
            }
            app::CreateError::InvalidName(_) => {
                (StatusCode::BAD_REQUEST, error.to_string()).into_response()
            }
            other => Internal::from(other).into_response(),
        }
    }
}