/*
 * Copyright (C) 2021  Aravinth Manivannan <realaravinth@batsense.net>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
use actix_identity::Identity;
use actix_web::HttpResponseBuilder;
use actix_web::{error::ResponseError, http::header, web, HttpResponse, Responder};
use lazy_static::lazy_static;
use my_codegen::{get, post};
use sailfish::TemplateOnce;

use crate::api::v1::auth::runners;
use crate::errors::*;
use crate::pages::errors::ErrorPage;
use crate::AppData;
use crate::PAGES;

#[derive(Clone, TemplateOnce)]
#[template(path = "auth/login/index.html")]
struct IndexPage<'a> {
    error: Option<ErrorPage<'a>>,
}

const PAGE: &str = "Login";

impl<'a> Default for IndexPage<'a> {
    fn default() -> Self {
        IndexPage { error: None }
    }
}

impl<'a> IndexPage<'a> {
    pub fn new(title: &'a str, message: &'a str) -> Self {
        Self {
            error: Some(ErrorPage::new(title, message)),
        }
    }
}

lazy_static! {
    static ref INDEX: String = IndexPage::default().render_once().unwrap();
}

#[get(path = "PAGES.auth.login")]
pub async fn login() -> impl Responder {
    HttpResponse::Ok()
        .content_type("text/html; charset=utf-8")
        .body(&*INDEX)
}

#[post(path = "PAGES.auth.login")]
pub async fn login_submit(
    id: Identity,
    payload: web::Form<runners::Login>,
    data: AppData,
) -> PageResult<impl Responder> {
    let payload = payload.into_inner();
    match runners::login_runner(&payload, &data).await {
        Ok(username) => {
            id.remember(username);
            Ok(HttpResponse::Found()
                .insert_header((header::LOCATION, PAGES.home))
                .finish())
        }
        Err(e) => {
            let status = e.status_code();
            let heading = status.canonical_reason().unwrap_or("Error");

            Ok(HttpResponseBuilder::new(status)
                .content_type("text/html; charset=utf-8")
                .body(
                    IndexPage::new(heading, &format!("{}", e))
                        .render_once()
                        .unwrap(),
                ))
        }
    }
}

#[cfg(test)]
mod tests {
    use actix_web::test;

    use super::*;

    use crate::api::v1::auth::runners::{Login, Register};
    use crate::data::Data;
    use crate::tests::*;
    use crate::*;
    use actix_web::http::StatusCode;

    #[actix_rt::test]
    async fn auth_form_works() {
        let data = Data::new().await;
        const NAME: &str = "testuserform";
        const PASSWORD: &str = "longpassword";

        let app = get_app!(data).await;

        delete_user(NAME, &data).await;

        // 1. Register with email == None
        let msg = Register {
            username: NAME.into(),
            password: PASSWORD.into(),
            confirm_password: PASSWORD.into(),
            email: None,
        };
        let resp = test::call_service(
            &app,
            post_request!(&msg, V1_API_ROUTES.auth.register).to_request(),
        )
        .await;
        assert_eq!(resp.status(), StatusCode::OK);

        // correct form login
        let msg = Login {
            login: NAME.into(),
            password: PASSWORD.into(),
        };

        let resp = test::call_service(
            &app,
            post_request!(&msg, PAGES.auth.login, FORM).to_request(),
        )
        .await;
        assert_eq!(resp.status(), StatusCode::FOUND);
        let headers = resp.headers();
        assert_eq!(headers.get(header::LOCATION).unwrap(), PAGES.home,);

        // incorrect form login
        let msg = Login {
            login: NAME.into(),
            password: NAME.into(),
        };
        let resp = test::call_service(
            &app,
            post_request!(&msg, PAGES.auth.login, FORM).to_request(),
        )
        .await;
        assert_eq!(resp.status(), StatusCode::UNAUTHORIZED);

        // non-existent form login
        let msg = Login {
            login: PASSWORD.into(),
            password: PASSWORD.into(),
        };
        let resp = test::call_service(
            &app,
            post_request!(&msg, PAGES.auth.login, FORM).to_request(),
        )
        .await;
        assert_eq!(resp.status(), StatusCode::NOT_FOUND);
    }
}