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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 serde::{Deserialize, Serialize};
    use sqlx::PgPool;

    use crate::errors::*;

    #[derive(Debug, Clone, Deserialize, Serialize)]
    pub struct Stats {
        pub config_fetches: Vec<i64>,
        pub solves: Vec<i64>,
        pub confirms: Vec<i64>,
    }

    impl Stats {
        pub async fn new(key: &str, db: &PgPool) -> ServiceResult<Self> {
            let config_fetches_fut = Self::fetch_config_fetched(key, db);
            let solves_fut = Self::fetch_solve(key, db);
            let confirms_fut = Self::fetch_confirm(key, db);

            let (config_fetches, solves, confirms) =
                futures::try_join!(config_fetches_fut, solves_fut, confirms_fut)?;

            let res = Self {
                config_fetches,
                solves,
                confirms,
            };

            Ok(res)
        }

        /// featch PoWConfig fetches
        #[inline]
        pub async fn fetch_config_fetched(
            key: &str,
            db: &PgPool,
        ) -> ServiceResult<Vec<i64>> {
            let records = sqlx::query!(
                "SELECT fetched_at FROM mcaptcha_pow_fetched_stats WHERE config_id =
            (SELECT config_id FROM mcaptcha_config where key = $1)",
                &key,
            )
            .fetch_all(db)
            .await?;

            let mut res: Vec<i64> = Vec::with_capacity(records.len());

            records
                .iter()
                .for_each(|record| res.push(record.fetched_at.unix_timestamp()));

            Ok(res)
        }

        /// featch PoWConfig solves
        #[inline]
        pub async fn fetch_solve(key: &str, db: &PgPool) -> ServiceResult<Vec<i64>> {
            //    "SELECT solved_at FROM mcaptcha_pow_solved_stats WHERE config_id =
            //    (SELECT config_id FROM mcaptcha_config where key = $1)"
            let records = sqlx::query!(
                "SELECT solved_at FROM mcaptcha_pow_solved_stats WHERE config_id =
            (SELECT config_id FROM mcaptcha_config where key = $1)",
                &key,
            )
            .fetch_all(db)
            .await?;

            let mut res: Vec<i64> = Vec::with_capacity(records.len());

            records
                .iter()
                .for_each(|record| res.push(record.solved_at.unix_timestamp()));

            Ok(res)
        }

        /// featch PoWConfig confirms
        #[inline]
        pub async fn fetch_confirm(key: &str, db: &PgPool) -> ServiceResult<Vec<i64>> {
            let records = sqlx::query!(
                "SELECT confirmed_at FROM mcaptcha_pow_confirmed_stats WHERE config_id = (
            SELECT config_id FROM mcaptcha_config where key = $1)",
                &key
            )
            .fetch_all(db)
            .await?;

            let mut res: Vec<i64> = Vec::with_capacity(records.len());

            records
                .iter()
                .for_each(|record| res.push(record.confirmed_at.unix_timestamp()));

            Ok(res)
        }
    }

    #[cfg(test)]
    mod tests {
        use super::*;
        use crate::stats::record::*;
        use crate::tests::*;
        use crate::*;

        #[actix_rt::test]
        async fn stats_works() {
            const NAME: &str = "statsuser";
            const PASSWORD: &str = "testingpas";
            const EMAIL: &str = "statsuser@a.com";

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

            register_and_signin(NAME, EMAIL, PASSWORD).await;
            let (_, _, _, token_key) = add_levels_util(NAME, PASSWORD).await;
            let key = token_key.key.clone();

            let stats = Stats::new(&key, &data.db).await.unwrap();

            assert_eq!(stats.config_fetches.len(), 0);
            assert_eq!(stats.solves.len(), 0);
            assert_eq!(stats.confirms.len(), 0);

            futures::join!(
                record_fetch(&key, &data.db),
                record_solve(&key, &data.db),
                record_confirm(&key, &data.db)
            );

            let stats = Stats::new(&key, &data.db).await.unwrap();

            assert_eq!(stats.config_fetches.len(), 1);
            assert_eq!(stats.solves.len(), 1);
            assert_eq!(stats.confirms.len(), 1);
        }
    }