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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/>.
     */

    #![warn(missing_docs)]
    //! # `mCaptcha` database operations
    //!
    //! Traits and datastructures used in mCaptcha to interact with database.
    //!
    //! To use an unsupported database with mCaptcha, traits present within this crate should be
    //! implemented.
    //!
    //!
    //! ## Organisation
    //!
    //! Database functionallity is divided accross various modules:
    //!
    //! - [errors](crate::auth): error data structures used in this crate
    //! - [ops](crate::ops): meta operations like connection pool creation, migrations and getting
    //! connection from pool
    use serde::{Deserialize, Serialize};

    pub use libmcaptcha::defense::Level;

    pub mod errors;
    pub mod ops;
    #[cfg(feature = "test")]
    pub mod tests;

    use dev::*;
    pub use ops::GetConnection;

    pub mod prelude {
        //! useful imports for users working with a supported database

        pub use super::errors::*;
        pub use super::ops::*;
        pub use super::*;
    }

    pub mod dev {
        //! useful imports for supporting a new database
        pub use super::prelude::*;
        pub use async_trait::async_trait;
    }

    #[derive(Clone, Debug, Deserialize, Serialize, PartialEq)]
    /// Data required to register a new user
    pub struct Register<'a> {
        /// username of new user
        pub username: &'a str,
        /// secret of new user
        pub secret: &'a str,
        /// hashed password of new use
        pub hash: &'a str,
        /// Optionally, email of new use
        pub email: Option<&'a str>,
    }

    #[derive(Clone, Debug, Deserialize, Serialize, PartialEq)]
    /// data required to update them email of a user
    pub struct UpdateEmail<'a> {
        /// username of the user
        pub username: &'a str,
        /// new email address of the user
        pub new_email: &'a str,
    }

    #[derive(Clone, Debug, Deserialize, Serialize, PartialEq)]
    /// types of credentials used as identifiers during login
    pub enum Login<'a> {
        /// username as login
        Username(&'a str),
        /// email as login
        Email(&'a str),
    }

    #[derive(Clone, Debug, Deserialize, Serialize, PartialEq)]
    /// type encapsulating username and hashed password of a user
    pub struct NameHash {
        /// username
        pub username: String,
        /// hashed password
        pub hash: String,
    }

    #[async_trait]
    /// mCaptcha's database requirements. To implement support for $Database, kindly implement this
    /// trait.
    pub trait MCDatabase: std::marker::Send + std::marker::Sync + CloneSPDatabase {
        /// ping DB
        async fn ping(&self) -> bool;

        /// register a new user
        async fn register(&self, p: &Register) -> DBResult<()>;

        /// delete a user
        async fn delete_user(&self, username: &str) -> DBResult<()>;

        /// check if username exists
        async fn username_exists(&self, username: &str) -> DBResult<bool>;

        /// get user email
        async fn get_email(&self, username: &str) -> DBResult<Option<String>>;

        /// check if email exists
        async fn email_exists(&self, email: &str) -> DBResult<bool>;

        /// update a user's email
        async fn update_email(&self, p: &UpdateEmail) -> DBResult<()>;

        /// get a user's password
        async fn get_password(&self, l: &Login) -> DBResult<NameHash>;

        /// update user's password
        async fn update_password(&self, p: &NameHash) -> DBResult<()>;

        /// update username
        async fn update_username(&self, current: &str, new: &str) -> DBResult<()>;

        /// get a user's secret
        async fn get_secret(&self, username: &str) -> DBResult<Secret>;

        /// get a user's secret from a captcha key
        async fn get_secret_from_captcha(&self, key: &str) -> DBResult<Secret>;

        /// update a user's secret
        async fn update_secret(&self, username: &str, secret: &str) -> DBResult<()>;

        /// create new captcha
        async fn create_captcha(&self, username: &str, p: &CreateCaptcha) -> DBResult<()>;

        /// Get captcha config
        async fn get_captcha_config(&self, username: &str, key: &str) -> DBResult<Captcha>;

        /// Get all captchas belonging to user
        async fn get_all_user_captchas(&self, username: &str) -> DBResult<Vec<Captcha>>;

        /// update captcha metadata; doesn't change captcha key
        async fn update_captcha_metadata(
            &self,
            username: &str,
            p: &CreateCaptcha,
        ) -> DBResult<()>;

        /// update captcha key; doesn't change metadata
        async fn update_captcha_key(
            &self,
            username: &str,
            old_key: &str,
            new_key: &str,
        ) -> DBResult<()>;

        /// Add levels to captcha
        async fn add_captcha_levels(
            &self,
            username: &str,
            captcha_key: &str,
            levels: &[Level],
        ) -> DBResult<()>;

        /// check if captcha exists
        async fn captcha_exists(
            &self,
            username: Option<&str>,
            captcha_key: &str,
        ) -> DBResult<bool>;

        /// Delete all levels of a captcha
        async fn delete_captcha_levels(
            &self,
            username: &str,
            captcha_key: &str,
        ) -> DBResult<()>;

        /// Delete captcha
        async fn delete_captcha(&self, username: &str, captcha_key: &str) -> DBResult<()>;

        /// Get captcha levels
        async fn get_captcha_levels(
            &self,
            username: Option<&str>,
            captcha_key: &str,
        ) -> DBResult<Vec<Level>>;

        /// Get captcha's cooldown period
        async fn get_captcha_cooldown(&self, captcha_key: &str) -> DBResult<i32>;

        /// Add traffic configuration
        async fn add_traffic_pattern(
            &self,
            username: &str,
            captcha_key: &str,
            pattern: &TrafficPattern,
        ) -> DBResult<()>;

        /// Get traffic configuration
        async fn get_traffic_pattern(
            &self,
            username: &str,
            captcha_key: &str,
        ) -> DBResult<TrafficPattern>;

        /// Delete traffic configuration
        async fn delete_traffic_pattern(
            &self,
            username: &str,
            captcha_key: &str,
        ) -> DBResult<()>;

        /// create new notification
        async fn create_notification(&self, p: &AddNotification) -> DBResult<()>;

        /// get all unread notifications
        async fn get_all_unread_notifications(
            &self,
            username: &str,
        ) -> DBResult<Vec<Notification>>;

        /// mark a notification read
        async fn mark_notification_read(&self, username: &str, id: i32) -> DBResult<()>;

        /// record PoWConfig fetches
        async fn record_fetch(&self, key: &str) -> DBResult<()>;

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

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

        /// featch PoWConfig fetches
        async fn fetch_config_fetched(&self, user: &str, key: &str) -> DBResult<Vec<i64>>;

        /// featch PoWConfig solves
        async fn fetch_solve(&self, user: &str, key: &str) -> DBResult<Vec<i64>>;

        /// featch PoWConfig confirms
        async fn fetch_confirm(&self, user: &str, key: &str) -> DBResult<Vec<i64>>;
    }

    #[derive(Debug, Clone, Default, Deserialize, Serialize, PartialEq)]
    /// Captcha statistics with time recorded in UNIX epoch formats
    pub struct StatsUnixTimestamp {
        /// times at which the configuration were fetched
        pub config_fetches: Vec<i64>,
        /// times at which the PoW was solved
        pub solves: Vec<i64>,
        /// times at which the PoW token was verified
        pub confirms: Vec<i64>,
    }

    #[derive(Debug, Clone, Default, Deserialize, Serialize, PartialEq)]
    /// Represents notification
    pub struct Notification {
        /// receiver name  of the notification
        pub name: Option<String>,
        /// heading of the notification
        pub heading: Option<String>,
        /// message of the notification
        pub message: Option<String>,
        /// when notification was received
        pub received: Option<i64>,
        /// db assigned ID of the notification
        pub id: Option<i32>,
    }

    #[derive(Debug, Clone, Default, PartialEq, Serialize, Deserialize)]
    /// Data required to add notification
    pub struct AddNotification<'a> {
        /// who is the notification addressed to?
        pub to: &'a str,
        /// notification sender
        pub from: &'a str,
        /// heading of the notification
        pub heading: &'a str,
        /// mesage of the notification
        pub message: &'a str,
    }

    #[derive(Default, PartialEq, Serialize, Deserialize, Clone, Debug)]
    /// User's traffic pattern; used in generating a captcha configuration
    pub struct TrafficPattern {
        /// average traffic of user's website
        pub avg_traffic: u32,
        /// the peak traffic that the user's website can handle
        pub peak_sustainable_traffic: u32,
        /// trafic that bought the user's website down; optional
        pub broke_my_site_traffic: Option<u32>,
    }

    #[derive(Clone, Debug, Default, PartialEq, Deserialize, Serialize)]
    /// data requried to create new captcha
    pub struct CreateCaptcha<'a> {
        /// cool down duration
        pub duration: i32,
        /// description of the captcha
        pub description: &'a str,
        /// secret key of the captcha
        pub key: &'a str,
    }

    #[derive(Clone, Debug, Default, PartialEq, Deserialize, Serialize)]
    /// Data representing a captcha
    pub struct Captcha {
        /// Database assigned ID
        pub config_id: i32,
        /// cool down duration
        pub duration: i32,
        /// description of the captcha
        pub description: String,
        /// secret key of the captcha
        pub key: String,
    }

    #[derive(Clone, Debug, Deserialize, PartialEq, Default, Serialize)]
    /// datastructure representing a user's secret
    pub struct Secret {
        /// user's secret
        pub secret: String,
    }

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

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

    impl Clone for Box<dyn MCDatabase> {
        fn clone(&self) -> Self {
            (**self).clone_db()
        }
    }