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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::{error::ResponseError, web, HttpResponse, Responder};
use lazy_static::lazy_static;
use sailfish::TemplateOnce;

use crate::errors::PageError;

pub trait Errorable: TemplateOnce {
    fn get_error_resp<E: ResponseError>(self, e: E) -> HttpResponse;
}

#[macro_export]
macro_rules! ImplErrorable {
    ($struct:ident) => {
        impl crate::pages::errors::Errorable for $struct {
            fn get_error_resp<E>(mut self, e: E) -> actix_web::HttpResponse
            where
                E: actix_web::error::ResponseError + std::fmt::Display,
                //R: actix_web::Responder
            {
                self.error = Some(e.to_string());
                let page = self.render_once().unwrap();
                println!("status code: {}", e.status_code());
                actix_web::dev::HttpResponseBuilder::new(e.status_code())
                    .content_type("text/html; charset=utf-8")
                    .body(&page)
                    .into()
            }
        }
    };
}

#[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);
    }
}