use axum::{
    extract::{Form, State},
    http::StatusCode,
    response::{IntoResponse, Redirect, Response},
    routing::post,
    Router,
};

use crate::{app::App, clock::RequestedAt, error::InternalError};

use super::{app, extract::IdentityToken};

pub fn router() -> Router<App> {
    Router::new()
        .route("/login", post(on_login))
        .route("/logout", post(on_logout))
}

#[derive(serde::Deserialize)]
struct LoginRequest {
    name: String,
    password: String,
}

async fn on_login(
    State(app): State<App>,
    RequestedAt(now): RequestedAt,
    identity: IdentityToken,
    Form(form): Form<LoginRequest>,
) -> Result<LoginSuccess, LoginError> {
    let token = app
        .logins()
        .login(&form.name, &form.password, now)
        .await
        .map_err(LoginError)?;
    let identity = identity.set(&token);
    Ok(LoginSuccess(identity))
}

struct LoginSuccess(IdentityToken);

impl IntoResponse for LoginSuccess {
    fn into_response(self) -> Response {
        let Self(identity) = self;
        (identity, Redirect::to("/")).into_response()
    }
}

struct LoginError(app::LoginError);

impl IntoResponse for LoginError {
    fn into_response(self) -> Response {
        let Self(error) = self;
        match error {
            app::LoginError::Rejected => {
                (StatusCode::UNAUTHORIZED, "invalid name or password").into_response()
            }
            app::LoginError::DatabaseError(error) => InternalError::from(error).into_response(),
            app::LoginError::PasswordHashError(error) => InternalError::from(error).into_response(),
        }
    }
}

async fn on_logout(
    State(app): State<App>,
    identity: IdentityToken,
) -> Result<impl IntoResponse, InternalError> {
    if let Some(secret) = identity.secret() {
        app.logins().logout(secret).await?;
    }

    let identity = identity.clear();

    Ok((identity, Redirect::to("/")))
}