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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 async_trait::async_trait;
    use db_core::errors::DBResult;
    use serde::{Deserialize, Serialize};

    use crate::data::Data;

    #[async_trait]
    pub trait Stats: std::marker::Send + std::marker::Sync + CloneStats {
        /// record PoWConfig fetches
        async fn record_fetch(&self, d: &Data, key: &str) -> DBResult<()>;

        /// record PoWConfig solves
        async fn record_solve(&self, d: &Data, key: &str) -> DBResult<()>;

        /// record PoWConfig confirms
        async fn record_confirm(&self, d: &Data, key: &str) -> DBResult<()>;

        /// fetch stats
        async fn fetch(&self, d: &Data, user: &str, key: &str) -> DBResult<CaptchaStats>;
    }

    /// Trait to clone MCDatabase
    pub trait CloneStats {
        /// clone DB
        fn clone_stats(&self) -> Box<dyn Stats>;
    }

    impl<T> CloneStats for T
    where
        T: Stats + Clone + 'static,
    {
        fn clone_stats(&self) -> Box<dyn Stats> {
            Box::new(self.clone())
        }
    }

    //impl Clone for Box<dyn CloneStats> {
    //    fn clone(&self) -> Self {
    //        Box::clone(self)
    //        //(*self).clone_stats()
    //    }
    //}

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

    #[derive(Clone, Default, PartialEq, Debug)]
    pub struct Real;

    #[async_trait]
    impl Stats for Real {
        /// record PoWConfig fetches
        async fn record_fetch(&self, d: &Data, key: &str) -> DBResult<()> {
            d.db.record_fetch(key).await
        }

        /// record PoWConfig solves
        async fn record_solve(&self, d: &Data, key: &str) -> DBResult<()> {
            d.db.record_solve(key).await
        }

        /// record PoWConfig confirms
        async fn record_confirm(&self, d: &Data, key: &str) -> DBResult<()> {
            d.db.record_confirm(key).await
        }

        /// fetch stats
        async fn fetch(&self, d: &Data, user: &str, key: &str) -> DBResult<CaptchaStats> {
            let config_fetches_fut = d.db.fetch_config_fetched(user, key);
            let solves_fut = d.db.fetch_solve(user, key);
            let confirms_fut = d.db.fetch_confirm(user, key);

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

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

            Ok(res)
        }
    }

    #[derive(Clone, Default, PartialEq, Debug)]
    pub struct Dummy;

    #[async_trait]
    impl Stats for Dummy {
        /// record PoWConfig fetches
        async fn record_fetch(&self, _: &Data, _: &str) -> DBResult<()> {
            Ok(())
        }

        /// record PoWConfig solves
        async fn record_solve(&self, _: &Data, _: &str) -> DBResult<()> {
            Ok(())
        }

        /// record PoWConfig confirms
        async fn record_confirm(&self, _: &Data, _: &str) -> DBResult<()> {
            Ok(())
        }

        /// fetch stats
        async fn fetch(&self, _: &Data, _: &str, _: &str) -> DBResult<CaptchaStats> {
            Ok(CaptchaStats::default())
        }
    }