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    /*
    * 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_web::{web, HttpResponse, Responder};
    use lazy_static::lazy_static;
    use sailfish::TemplateOnce;

    use crate::errors::PageError;

    #[derive(Clone, TemplateOnce)]
    #[template(path = "errors/index.html")]
    struct ErrorPage<'a> {
        title: &'a str,
        message: &'a str,
    }

    const PAGE: &str = "Error";

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

    lazy_static! {
        static ref INTERNAL_SERVER_ERROR_BODY: String = ErrorPage::new(
            "Internal Server Error",
            &format!("{}", PageError::InternalServerError),
        )
        .render_once()
        .unwrap();
        static ref UNKNOWN_ERROR_BODY: String = ErrorPage::new(
            "Something went wrong",
            &format!("{}", PageError::InternalServerError),
        )
        .render_once()
        .unwrap();
    }

    async fn error(path: web::Path<usize>) -> impl Responder {
        let resp = match path.0 {
            500 => HttpResponse::InternalServerError()
                .content_type("text/html; charset=utf-8")
                .body(&*INTERNAL_SERVER_ERROR_BODY),

            _ => HttpResponse::InternalServerError()
                .content_type("text/html; charset=utf-8")
                .body(&*UNKNOWN_ERROR_BODY),
        };

        resp
    }

    pub fn services(cfg: &mut web::ServiceConfig) {
        use crate::define_resource;

        define_resource!(cfg, "/error/{id}", Methods::Get, error);
    }

    pub mod routes {
        pub struct Errors {
            pub internal_server_error: &'static str,
            pub unknown_error: &'static str,
        }

        impl Errors {
            pub const fn new() -> Self {
                Errors {
                    internal_server_error: "/error/500",
                    unknown_error: "/error/007",
                }
            }
        }
    }

    #[cfg(test)]
    mod tests {
        use actix_web::{http::StatusCode, test, App};

        use super::*;
        use crate::PAGES;

        #[actix_rt::test]
        async fn error_pages_work() {
            let mut app = test::init_service(App::new().configure(services)).await;

            let resp = test::call_service(
                &mut app,
                test::TestRequest::get()
                    .uri(PAGES.errors.internal_server_error)
                    .to_request(),
            )
            .await;
            assert_eq!(resp.status(), StatusCode::INTERNAL_SERVER_ERROR);

            let resp = test::call_service(
                &mut app,
                test::TestRequest::get()
                    .uri(PAGES.errors.unknown_error)
                    .to_request(),
            )
            .await;
            assert_eq!(resp.status(), StatusCode::INTERNAL_SERVER_ERROR);
        }
    }