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use actix_web::{dev::ServiceResponse, test};
use actix_service::Service;


/// Response body holding body as String and status
pub struct RespBody {
    pub status: actix_web::http::StatusCode,
    pub body: String,
}

/// Get test method for Actix server
/// ```rust
/// use actix_web::{dev::ServiceResponse, web, Responder, test};
/// use actix_service::Service;
///
/// async fn index(info: web::Path<(u32, String)>) -> impl Responder {
///     let (id, name) = info.into_inner();
///     format!("Hello {}! id:{}", name, id)
/// }
/// 
/// #[actix_rt::test]
/// async fn test_minimal() {
///     let mut app = test::init_service(App::new().service(index)).await;
/// 
///     let resp = get(&mut app, "/32/Filip").await;
///     assert_eq!(resp.status.as_u16(), 200);
///     assert_eq!(resp.body, "Hello Filip! id:32");
/// }
/// ```
pub async fn get<'a, SERVICE, BODY, E>(app: &'a mut SERVICE, url: &'a str) -> anyhow::Result<RespBody>
where
    BODY: actix_http::body::MessageBody + Unpin,
    E: std::fmt::Debug,
    SERVICE: Service<Request = actix_http::Request, Response = ServiceResponse<BODY>, Error = E>,
{
    let req = test::TestRequest::get().uri(url).to_request();
    let resp = match call_service_res(app, req).await {
        Ok(resp) => resp,
        Err(err) => return Err(anyhow::anyhow!("call_service_res failed: {:?}", err)),
    };
    let status = resp.status().clone();
    let body = test::read_body(resp).await;
    let body = String::from_utf8_lossy(&body).to_string();

    Ok(RespBody {
        status,
        body,
    })
}

/// Post test method for Actix server
///
/// ```rust
/// use actix_web::{dev::ServiceResponse, post, web, Responder, test};
/// use actix_service::Service;
/// use serde::{Serialize, Deserialize};
///
/// #[derive(Serialize, Deserialize)]
/// struct User {
///     name: String, 
/// }
/// 
/// #[post("/api/users")]
/// async fn post_user(
///     user: web::Json<User>,
/// ) -> impl Responder {
///     format!("Name is: {}!", user.name)
/// }
/// 
/// #[actix_rt::test]
/// async fn test_minimal() {
///     let mut app = test::init_service(App::new().service(post_users)).await;
/// 
///     let user = User { name: "Filip".to_string() };
///     let resp = post_json(&mut app, user, "/api/users").await;
///     assert_eq!(resp.status.as_u16(), 200);
///     assert_eq!(resp.body, "Name is: Filip!");
/// }
/// ```
pub async fn post_json<'a, SERVICE, BODY, SERDE, E>(app: &'a mut SERVICE, json: SERDE, url: &'a str) -> anyhow::Result<RespBody>
where
    BODY: actix_http::body::MessageBody + std::marker::Unpin,
    SERVICE: Service<Request = actix_http::Request, Response = ServiceResponse<BODY>, Error = E>,
    SERDE: serde::ser::Serialize,
    E: std::fmt::Debug,
{
    let req = test::TestRequest::post()
        .set_json(&json)
        .uri(url).to_request();
    let resp = match call_service_res(app, req).await {
        Ok(resp) => resp,
        Err(err) => return Err(anyhow::anyhow!("call_service_res failed: {:?}", err)),
    };
//        .expect("Not possible to get request");
    let status = resp.status().clone();
    let body = test::read_body(resp).await;
    let body = String::from_utf8_lossy(&body).to_string();

    Ok(RespBody {
        status,
        body,
    })
}

/// Calls service and waits for response future completion.
/// 
/// ## Note
/// 
/// When testing baerer/basic login which ends with AuthentificationError original method panic.
/// This method returns `Result<T>` not `T` with `unwrap`
///
/// ```rust
/// use actix_web::{test, App, HttpResponse, http::StatusCode};
/// use actix_service::Service;
///
/// #[test]
/// fn test_response() {
///     let mut app = test::init_service(
///         App::new()
///             .service(web::resource("/test").to(|| async {
///                 HttpResponse::Ok()
///             }))
///     ).await;
///
///     // Create request object
///     let req = test::TestRequest::with_uri("/test").to_request();
///
///     // Call application
///     let resp = test::call_service(&mut app, req).await;
///     assert!(resp.is_ok());
///     assert_eq!(resp.unwrap().status(), StatusCode::OK);
/// }
/// ```
pub async fn call_service_res<S, R, B, E>(app: &mut S, req: R) -> Result<S::Response, S::Error>
where
    S: Service<Request = R, Response = ServiceResponse<B>, Error = E>,
    E: std::fmt::Debug,
{
    app.call(req).await
}

#[cfg(test)]
mod tests {
    use super::*;
    use actix_web::{test, get, post, web, App, Responder};
    use serde::{Serialize, Deserialize};

    #[get("/{id}/{name}")]
    async fn index(info: web::Path<(u32, String)>) -> impl Responder {
        let (id, name) = info.into_inner();

        format!("Hello {}! id:{}", name, id)
    }

    #[derive(Serialize, Deserialize)]
    struct User {
        name: String, 
    }

    #[post("/api/users")]
    async fn post_user(
        user: web::Json<User>,
    ) -> impl Responder {
        format!("Name is: {}!", user.name)
    }

    #[actix_rt::test]
    async fn test_get_minimal() {
        let mut app = test::init_service(App::new().service(index)).await;

        let resp = get(&mut app, "/32/Filip").await;
        assert!(resp.is_ok());
        let resp = resp.unwrap();
        assert_eq!(resp.status.as_u16(), 200);
        assert_eq!(resp.body, "Hello Filip! id:32");
    }

    #[actix_rt::test]
    async fn test_get_fail() {
        let mut app = test::init_service(App::new().service(index)).await;

        let resp = get(&mut app, "/32/Filip/Not").await;
        assert!(resp.is_ok());
        let resp = resp.unwrap();
        assert_eq!(resp.status.as_u16(), 404);
        assert_eq!(resp.body, "");
    }

    #[actix_rt::test]
    async fn test_post() {
        let mut app = test::init_service(App::new().service(post_user)).await;

        let user = User { name: "Filip".to_string() };
        let resp = post_json(&mut app, user, "/api/users").await;
        assert!(resp.is_ok());
        let resp = resp.unwrap();
        assert_eq!(resp.status.as_u16(), 200);
        assert_eq!(resp.body, "Name is: Filip!");
    }
}