/*
* 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 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() {
    if !data.dblib.captcha_exists(None, &payload.key).await? {
        return Err(ServiceError::TokenNotFound);
    }
    let payload = payload.into_inner();

    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()),
    }

    //    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 = data.dblib.get_captcha_levels(None, key).await?;
    struct DurationResp {
        duration: i32,
    }
    // get duration
    let duration = sqlx::query_as!(
        DurationResp,
        "SELECT duration FROM mcaptcha_config  
        WHERE key = $1",
        &key,
    )
    .fetch_one(&data.db)
    .await?;
    //let (levels, duration) = futures::try_join!(levels_fut, duration_fut).await?;

    // 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)]
pub mod tests {
    use crate::*;
    use libmcaptcha::pow::PoWConfig;

    #[actix_rt::test]
    pub 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 = crate::data::Data::new().await;
        let data = &data;

        delete_user(data, NAME).await;

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