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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/>.
     */
    //! App data: redis cache, database connections, etc.
    use std::sync::Arc;
    use std::thread;

    use actix::prelude::*;
    use argon2_creds::{Config, ConfigBuilder, PasswordPolicy};
    use lettre::transport::smtp::authentication::Mechanism;
    use lettre::{
        transport::smtp::authentication::Credentials, AsyncSmtpTransport, Tokio1Executor,
    };
    use libmcaptcha::cache::hashcache::HashCache;
    use libmcaptcha::cache::redis::RedisCache;
    use libmcaptcha::master::redis::master::Master as RedisMaster;
    use libmcaptcha::redis::RedisConfig;
    use libmcaptcha::{
        cache::messages::VerifyCaptchaResult,
        cache::Save,
        errors::CaptchaResult,
        master::messages::{AddSite, RemoveCaptcha, Rename},
        master::{embedded::master::Master as EmbeddedMaster, Master as MasterTrait},
        pow::ConfigBuilder as PoWConfigBuilder,
        pow::PoWConfig,
        pow::Work,
        system::{System, SystemBuilder},
    };

    use crate::db::{self, BoxDB};
    use crate::errors::ServiceResult;
    use crate::settings::Settings;
    use crate::stats::{Dummy, Real, Stats};

    macro_rules! enum_system_actor {
        ($name:ident, $type:ident) => {
            pub async fn $name(&self, msg: $type) -> ServiceResult<()> {
                match self {
                    Self::Embedded(val) => val.master.send(msg).await?.await??,
                    Self::Redis(val) => val.master.send(msg).await?.await??,
                };
                Ok(())
            }
        };
    }

    macro_rules! enum_system_wrapper {
        ($name:ident, $type:ty, $return_type:ty) => {
            pub async fn $name(&self, msg: $type) -> $return_type {
                match self {
                    Self::Embedded(val) => val.$name(msg).await,
                    Self::Redis(val) => val.$name(msg).await,
                }
            }
        };
    }

    /// Represents mCaptcha cache and master system.
    /// When Redis is configured, [SystemGroup::Redis] is used and
    /// in its absense, [SystemGroup::Embedded] is used
    pub enum SystemGroup {
        Embedded(System<HashCache, EmbeddedMaster>),
        Redis(System<RedisCache, RedisMaster>),
    }

    #[allow(unused_doc_comments)]
    impl SystemGroup {
        // TODO find a way to document these methods

        // utility function to get difficulty factor of site `id` and cache it
        enum_system_wrapper!(get_pow, String, CaptchaResult<Option<PoWConfig>>);

        // utility function to verify [Work]
        enum_system_wrapper!(verify_pow, Work, CaptchaResult<String>);

        // utility function to validate verification tokens
        enum_system_wrapper!(
            validate_verification_tokens,
            VerifyCaptchaResult,
            CaptchaResult<bool>
        );

        // utility function to AddSite
        enum_system_actor!(add_site, AddSite);

        // utility function to rename captcha
        enum_system_actor!(rename, Rename);

        // utility function to remove captcha
        enum_system_actor!(remove, RemoveCaptcha);

        fn new_system<A: Save, B: MasterTrait>(
            s: &Settings,
            m: Addr<B>,
            c: Addr<A>,
        ) -> System<A, B> {
            let pow = PoWConfigBuilder::default()
                .salt(s.captcha.salt.clone())
                .build()
                .unwrap();

            SystemBuilder::default().pow(pow).cache(c).master(m).build()
        }

        // read settings, if Redis is configured then produce a Redis mCaptcha cache
        // based SystemGroup
        async fn new(s: &Settings) -> Self {
            match &s.redis {
                Some(val) => {
                    let master = RedisMaster::new(RedisConfig::Single(val.url.clone()))
                        .await
                        .unwrap()
                        .start();
                    let cache = RedisCache::new(RedisConfig::Single(val.url.clone()))
                        .await
                        .unwrap()
                        .start();
                    let captcha = Self::new_system(s, master, cache);

                    SystemGroup::Redis(captcha)
                }
                None => {
                    let master = EmbeddedMaster::new(s.captcha.gc).start();
                    let cache = HashCache::default().start();
                    let captcha = Self::new_system(s, master, cache);

                    SystemGroup::Embedded(captcha)
                }
            }
        }
    }

    /// App data
    pub struct Data {
        /// database ops defined by db crates
        pub db: BoxDB,
        /// credential management configuration
        pub creds: Config,
        /// mCaptcha system: Redis cache, etc.
        pub captcha: SystemGroup,
        /// email client
        pub mailer: Option<Mailer>,
        /// app settings
        pub settings: Settings,
        /// stats recorder
        pub stats: Box<dyn Stats>,
    }

    impl Data {
        pub fn get_creds() -> Config {
            ConfigBuilder::default()
                .username_case_mapped(true)
                .profanity(true)
                .blacklist(true)
                .password_policy(PasswordPolicy::default())
                .build()
                .unwrap()
        }
        #[cfg(not(tarpaulin_include))]
        /// create new instance of app data
        pub async fn new(s: &Settings) -> Arc<Self> {
            let creds = Self::get_creds();
            let c = creds.clone();

            #[allow(unused_variables)]
            let init = thread::spawn(move || {
                log::info!("Initializing credential manager");
                c.init();
                log::info!("Initialized credential manager");
            });

            let db = match s.database.database_type {
                crate::settings::DBType::Maria => db::maria::get_data(Some(s.clone())).await,
                crate::settings::DBType::Postgres => db::pg::get_data(Some(s.clone())).await,
            };

            let stats: Box<dyn Stats> = if s.captcha.enable_stats {
                Box::new(Real::default())
            } else {
                Box::new(Dummy::default())
            };

            let data = Data {
                creds,
                db,
                captcha: SystemGroup::new(s).await,
                mailer: Self::get_mailer(s),
                settings: s.clone(),
                stats,
            };

            #[cfg(not(debug_assertions))]
            init.join().unwrap();

            Arc::new(data)
        }

        fn get_mailer(s: &Settings) -> Option<Mailer> {
            if let Some(smtp) = s.smtp.as_ref() {
                let creds =
                    Credentials::new(smtp.username.to_string(), smtp.password.to_string()); // "smtp_username".to_string(), "smtp_password".to_string());

                let mailer: Mailer =
                    AsyncSmtpTransport::<Tokio1Executor>::builder_dangerous(&smtp.url)
                        .port(smtp.port)
                        .credentials(creds)
                        .authentication(vec![
                            Mechanism::Login,
                            Mechanism::Xoauth2,
                            Mechanism::Plain,
                        ])
                        .build();

                //            let mailer: Mailer = AsyncSmtpTransport::<Tokio1Executor>::relay(&smtp.url) //"smtp.gmail.com")
                //                .unwrap()
                //                .credentials(creds)
                //                .build();
                Some(mailer)
            } else {
                None
            }
        }
    }

    /// Mailer data type AsyncSmtpTransport<Tokio1Executor>
    pub type Mailer = AsyncSmtpTransport<Tokio1Executor>;