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    /*
    * Copyright (C) 2022  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::prelude::*;
    use actix_web::{web, HttpResponse, Responder};
    use libmcaptcha::{
        defense::LevelBuilder, master::messages::AddSiteBuilder, DefenseBuilder,
        MCaptchaBuilder,
    };
    use serde::{Deserialize, Serialize};

    use super::I32Levels;
    use crate::errors::*;
    use crate::stats::record::record_fetch;
    use crate::AppData;
    use crate::V1_API_ROUTES;

    #[derive(Clone, Debug, Deserialize, Serialize)]
    pub struct GetConfigPayload {
        pub key: String,
    }

    // API keys are mcaptcha actor names

    /// get PoW configuration for an mcaptcha key
    #[my_codegen::post(path = "V1_API_ROUTES.pow.get_config()")]
    pub async fn get_config(
        payload: web::Json<GetConfigPayload>,
        data: AppData,
    ) -> ServiceResult<impl Responder> {
        let res = sqlx::query!(
            "SELECT EXISTS (SELECT 1 from mcaptcha_config WHERE key = $1)",
            &payload.key,
        )
        .fetch_one(&data.db)
        .await?;

        if res.exists.is_none() {
            return Err(ServiceError::TokenNotFound);
        }
        let payload = payload.into_inner();
        match res.exists {
            Some(true) => {
                match data.captcha.get_pow(payload.key.clone()).await {
                    Ok(Some(config)) => {
                        record_fetch(&payload.key, &data.db).await;
                        Ok(HttpResponse::Ok().json(config))
                    }
                    Ok(None) => {
                        init_mcaptcha(&data, &payload.key).await?;
                        let config = data
                            .captcha
                            .get_pow(payload.key.clone())
                            .await
                            .expect("mcaptcha should be initialized and ready to go");
                        // background it. would require data::Data to be static
                        // to satidfy lifetime
                        record_fetch(&payload.key, &data.db).await;
                        Ok(HttpResponse::Ok().json(config))
                    }
                    Err(e) => Err(e.into()),
                }
            }

            Some(false) => Err(ServiceError::TokenNotFound),
            None => Err(ServiceError::TokenNotFound),
        }
    }
    /// Call this when [MCaptcha][libmcaptcha::MCaptcha] is not in master.
    ///
    /// This fn gets mcaptcha config from database, builds [Defense][libmcaptcha::Defense],
    /// creates [MCaptcha][libmcaptcha::MCaptcha] and adds it to [Master][libmcaptcha::Defense]
    async fn init_mcaptcha(data: &AppData, key: &str) -> ServiceResult<()> {
        // get levels
        let levels_fut = sqlx::query_as!(
            I32Levels,
            "SELECT difficulty_factor, visitor_threshold FROM mcaptcha_levels  WHERE
                config_id = (
                    SELECT config_id FROM mcaptcha_config WHERE key = ($1)
                    ) ORDER BY difficulty_factor ASC;",
            &key,
        )
        .fetch_all(&data.db);

        struct DurationResp {
            duration: i32,
        }
        // get duration
        let duration_fut = sqlx::query_as!(
            DurationResp,
            "SELECT duration FROM mcaptcha_config
            WHERE key = $1",
            &key,
        )
        .fetch_one(&data.db);
        //let (levels, duration) = futures::try_join!(levels_fut, duration_fut).await?;
        let (levels, duration) = futures::try_join!(levels_fut, duration_fut)?;

        // build defense
        let mut defense = DefenseBuilder::default();

        for level in levels.iter() {
            let level = LevelBuilder::default()
                .visitor_threshold(level.visitor_threshold as u32)
                .difficulty_factor(level.difficulty_factor as u32)
                .unwrap()
                .build()
                .unwrap();
            defense.add_level(level).unwrap();
        }

        let defense = defense.build()?;

        // create captcha
        let mcaptcha = MCaptchaBuilder::default()
            .defense(defense)
            // leaky bucket algorithm's emission interval
            .duration(duration.duration as u64)
            //   .cache(cache)
            .build()
            .unwrap();

        // add captcha to master
        let msg = AddSiteBuilder::default()
            .id(key.into())
            .mcaptcha(mcaptcha)
            .build()
            .unwrap();

        data.captcha.add_site(msg).await?;

        Ok(())
    }

    #[cfg(test)]
    mod tests {
        use libmcaptcha::pow::PoWConfig;

        #[actix_rt::test]
        async fn get_pow_config_works() {
            use super::*;
            use crate::tests::*;
            use crate::*;
            use actix_web::test;

            const NAME: &str = "powusrworks";
            const PASSWORD: &str = "testingpas";
            const EMAIL: &str = "randomuser@a.com";

            {
                let data = Data::new().await;
                delete_user(NAME, &data).await;
            }

            register_and_signin(NAME, EMAIL, PASSWORD).await;
            let (data, _, _signin_resp, token_key) = add_levels_util(NAME, PASSWORD).await;
            let app = get_app!(data).await;

            let get_config_payload = GetConfigPayload {
                key: token_key.key.clone(),
            };

            // update and check changes

            let url = V1_API_ROUTES.pow.get_config;
            println!("{}", &url);
            let get_config_resp = test::call_service(
                &app,
                post_request!(&get_config_payload, V1_API_ROUTES.pow.get_config)
                    .to_request(),
            )
            .await;
            assert_eq!(get_config_resp.status(), StatusCode::OK);
            let config: PoWConfig = test::read_body_json(get_config_resp).await;
            assert_eq!(config.difficulty_factor, L1.difficulty_factor);
        }
    }