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

    use crate::date::Date;
    use crate::errors::*;

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

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

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

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

    impl StatsUnixTimestamp {
        pub fn from_stats(stats: &Stats) -> Self {
            let config_fetches = Self::unix_timestamp(&stats.config_fetches);
            let solves = Self::unix_timestamp(&stats.solves);
            let confirms = Self::unix_timestamp(&stats.confirms);
            Self {
                config_fetches,
                solves,
                confirms,
            }
        }

        /// featch PoWConfig confirms
        #[inline]
        fn unix_timestamp(dates: &[Date]) -> Vec<i64> {
            let mut res: Vec<i64> = Vec::with_capacity(dates.len());

            dates
                .iter()
                .for_each(|record| res.push(record.time.unix_timestamp()));

            res
        }
    }

    pub mod runners {
        use super::*;
        /// featch PoWConfig fetches
        #[inline]
        pub async fn fetch_config_fetched(
            user: &str,
            key: &str,
            db: &PgPool,
        ) -> ServiceResult<Vec<Date>> {
            let records = sqlx::query_as!(
                Date,
                "SELECT time FROM mcaptcha_pow_fetched_stats
                WHERE
                    config_id = (
                        SELECT
                            config_id FROM mcaptcha_config
                        WHERE
                            key = $1
                        AND
                            user_id = (
                            SELECT
                                ID FROM mcaptcha_users WHERE name = $2))
                    ORDER BY time DESC",
                &key,
                &user,
            )
            .fetch_all(db)
            .await?;

            Ok(records)
        }

        /// featch PoWConfig solves
        #[inline]
        pub async fn fetch_solve(
            user: &str,
            key: &str,
            db: &PgPool,
        ) -> ServiceResult<Vec<Date>> {
            let records = sqlx::query_as!(
                Date,
                "SELECT time FROM mcaptcha_pow_solved_stats
                WHERE config_id = (
                    SELECT config_id FROM mcaptcha_config
                    WHERE
                        key = $1
                    AND
                         user_id = (
                            SELECT
                                ID FROM mcaptcha_users WHERE name = $2))
                    ORDER BY time DESC",
                &key,
                &user
            )
            .fetch_all(db)
            .await?;

            Ok(records)
        }

        /// featch PoWConfig confirms
        #[inline]
        pub async fn fetch_confirm(
            user: &str,
            key: &str,
            db: &PgPool,
        ) -> ServiceResult<Vec<Date>> {
            let records = sqlx::query_as!(
                Date,
                "SELECT time FROM mcaptcha_pow_confirmed_stats
                WHERE
                    config_id = (
                        SELECT config_id FROM mcaptcha_config
                    WHERE
                        key = $1
                    AND
                         user_id = (
                            SELECT
                                ID FROM mcaptcha_users WHERE name = $2))
                    ORDER BY time DESC",
                &key,
                &user
            )
            .fetch_all(db)
            .await?;

            Ok(records)
        }
    }

    #[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(NAME, &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(NAME, &key, &data.db).await.unwrap();

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

            let ustats = StatsUnixTimestamp::from_stats(&stats);
            assert_eq!(ustats.config_fetches.len(), 1);
            assert_eq!(ustats.solves.len(), 1);
            assert_eq!(ustats.confirms.len(), 1);
        }
    }